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Default Rigid Conduit vs Regular Iron pipe

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP
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Default Rigid Conduit vs Regular Iron pipe

On Mar 1, 4:11*pm, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP



You can bend conduit with an inexpensive tool. Conduit is much
lighter and cheaper than pipe.

Dan
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Default Rigid Conduit vs Regular Iron pipe

Bob Engelhardt fired this volley in
:

I've never seen rigid bent, only light & intermediate. Rigid is heavy

&


I bend it all the time, Bob. I have to use it in explosion-proof apps.

You don't bend it with a 'foot bender', though. I have an hydraulic
bender for that kind of stuff.

So... no for "you can bend it with an inexpensive tool", but you
certainly can bend it (cleanly).

Lloyd
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Default Rigid Conduit vs Regular Iron pipe

On Fri, 1 Mar 2013 15:40:45 -0800 (PST), "
wrote:

On Mar 1, 4:11*pm, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP



You can bend conduit with an inexpensive tool. Conduit is much
lighter and cheaper than pipe.

Dan


Conduit is thin wall material. It cant be threaded with any
suitability. Its not designed to carry anything other than wire.

Pipe is thick wall and is designed to be threaded and then threaded
into pipe fixtures...

Its capable of carrying significant pressures

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie


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Default Rigid Conduit vs Regular Iron pipe

On 3/1/2013 3:11 PM, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.


There are three standard weights for electrical conduit -- EMT
("thinwall"), IMC (intermediate metal conduit) and GRC (galvanized rigid
conduit). Partial table of standard dimensions per relevant ANSI spec's...

GRC

MIN. WGT.
/100 FOOT O.D. I.D. THICKNESS
SIZE IN LBS. INCHES INCHES INCHES
1/2" 79 0.840 0.632 0.104
3/4" 105 1.050 0.836 0.107
1" 153 1.315 1.063 0.126
1 1/4" 201 1.660 1.394 0.133
1 1/2" 249 1.900 1.624 0.138
2" 332 2.375 2.083 0.146

EMT

1/2" 29 0.706 0.622 0.042
3/4" 44 0.922 0.824 0.049
1" 65 1.163 1.049 0.057
1 1/4" 96 1.510 1.380 0.065
1 1/2" 111 1.740 1.610 0.065
2" 141 2.197 2.067 0.065

Steel pipe
Sch Sch Sch Sch
OD 5 10 40 80
1/2 0.840 0.065 0.083 0.109 0.147
3/4 1.050 0.065 0.083 0.113 0.154
1 1.315 0.065 0.190 0.133 0.179
1 1/4 1.660 0.065 0.109 0.140 0.140
1 1/2 1.900 0.065 0.109 0.145 0.200
2 2.375 0.065 0.109 0.154 0.218

As can be seen, GRC is roughly same weight as, but still slightly
lighter (thinner wall) than Sch 40 pipe but they have same OD

--

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Default Rigid Conduit vs Regular Iron pipe

In article , dpb wrote:

On 3/1/2013 3:11 PM, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.


There are three standard weights for electrical conduit -- EMT
("thinwall"), IMC (intermediate metal conduit) and GRC (galvanized rigid
conduit). Partial table of standard dimensions per relevant ANSI spec's...

GRC

MIN. WGT.
/100 FOOT O.D. I.D. THICKNESS
SIZE IN LBS. INCHES INCHES INCHES
1/2" 79 0.840 0.632 0.104
3/4" 105 1.050 0.836 0.107
1" 153 1.315 1.063 0.126
1 1/4" 201 1.660 1.394 0.133
1 1/2" 249 1.900 1.624 0.138
2" 332 2.375 2.083 0.146

EMT

1/2" 29 0.706 0.622 0.042
3/4" 44 0.922 0.824 0.049
1" 65 1.163 1.049 0.057
1 1/4" 96 1.510 1.380 0.065
1 1/2" 111 1.740 1.610 0.065
2" 141 2.197 2.067 0.065

Steel pipe
Sch Sch Sch Sch
OD 5 10 40 80
1/2 0.840 0.065 0.083 0.109 0.147
3/4 1.050 0.065 0.083 0.113 0.154
1 1.315 0.065 0.190 0.133 0.179
1 1/4 1.660 0.065 0.109 0.140 0.140
1 1/2 1.900 0.065 0.109 0.145 0.200
2 2.375 0.065 0.109 0.154 0.218

As can be seen, GRC is roughly same weight as, but still slightly
lighter (thinner wall) than Sch 40 pipe but they have same OD

--


Thanks for your informative reply. What are the thread specs? Std NPT or
something else. The couplings I have seen for GRC seen to be non tapered.
Is GRC meant to be liquid tight to prevent moisture entering?
Thanks

CP
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Default Rigid Conduit vs Regular Iron pipe

On Sat, 02 Mar 2013 03:36:14 -0800, Gunner
wrote:

On Fri, 1 Mar 2013 15:40:45 -0800 (PST), "
wrote:

On Mar 1, 4:11*pm, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP



You can bend conduit with an inexpensive tool. Conduit is much
lighter and cheaper than pipe.

Dan


Conduit is thin wall material. It cant be threaded with any
suitability. Its not designed to carry anything other than wire.



You are thinking EMT - electro-metalic tubing - not Rigid Conduit.
Rigid conduit is thick, and is threaded for EVERY use.
1" rigid conduit is .126 inch wall. The thread is generally a straight
thread instead of a tapered thread on pipe.
1 inch Sched 40 iron pipe is .130" wall thickness.
2 inch rigid is .146 inch wall thickness, while sched 40 iron is .150
nominal thickness

Rigid steel conduit can be galvanized (in and out) electro galvanised
(outer only) with organic coated interior, or organic coated in and
out - and Rigid conduit can also be aluminum or stainless steel or red
brass.

RMC has a smoother interior than pipe - it is a rolled, electrically
welded seam tubing with uniform wall thickness and a defect free
interior surface - required for pulling wire.

Black Iron Pipe is made from ductile iron - not steel (generally
speaking).

Pipe is thick wall and is designed to be threaded and then threaded
into pipe fixtures...

Its capable of carrying significant pressures

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie


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Default Rigid Conduit vs Regular Iron pipe

On Sat, 02 Mar 2013 07:29:27 -0800, Pilgrim
wrote:

In article , dpb wrote:

On 3/1/2013 3:11 PM, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.


There are three standard weights for electrical conduit -- EMT
("thinwall"), IMC (intermediate metal conduit) and GRC (galvanized rigid
conduit). Partial table of standard dimensions per relevant ANSI spec's...

GRC

MIN. WGT.
/100 FOOT O.D. I.D. THICKNESS
SIZE IN LBS. INCHES INCHES INCHES
1/2" 79 0.840 0.632 0.104
3/4" 105 1.050 0.836 0.107
1" 153 1.315 1.063 0.126
1 1/4" 201 1.660 1.394 0.133
1 1/2" 249 1.900 1.624 0.138
2" 332 2.375 2.083 0.146

EMT

1/2" 29 0.706 0.622 0.042
3/4" 44 0.922 0.824 0.049
1" 65 1.163 1.049 0.057
1 1/4" 96 1.510 1.380 0.065
1 1/2" 111 1.740 1.610 0.065
2" 141 2.197 2.067 0.065

Steel pipe
Sch Sch Sch Sch
OD 5 10 40 80
1/2 0.840 0.065 0.083 0.109 0.147
3/4 1.050 0.065 0.083 0.113 0.154
1 1.315 0.065 0.190 0.133 0.179
1 1/4 1.660 0.065 0.109 0.140 0.140
1 1/2 1.900 0.065 0.109 0.145 0.200
2 2.375 0.065 0.109 0.154 0.218

As can be seen, GRC is roughly same weight as, but still slightly
lighter (thinner wall) than Sch 40 pipe but they have same OD

--


Thanks for your informative reply. What are the thread specs? Std NPT or
something else. The couplings I have seen for GRC seen to be non tapered.
Is GRC meant to be liquid tight to prevent moisture entering?
Thanks

CP

GRC uses a NPS thread, not NPT (National Pipe Straight) not (National
Pipe Tapered)
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Default Rigid Conduit vs Regular Iron pipe

On Mar 2, 10:29*am, Pilgrim wrote:
In article , dpb wrote:
On 3/1/2013 3:11 PM, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.


There are three standard weights for electrical conduit -- EMT
("thinwall"), IMC (intermediate metal conduit) and GRC (galvanized rigid
conduit). *Partial table of standard dimensions per relevant ANSI spec's...


* * * * * * * * GRC


* * * *MIN. WGT.
* * * */100 FOOT *O.D. * *I.D. THICKNESS
SIZE * IN LBS. *INCHES *INCHES *INCHES
1/2" * * 79 * * 0.840 * 0.632 * 0.104
3/4" * *105 * * 1.050 * 0.836 * 0.107
1" * * *153 * * 1.315 * 1.063 * 0.126
1 1/4" *201 * * 1.660 * 1.394 * 0.133
1 1/2" *249 * * 1.900 * 1.624 * 0.138
2" * * *332 * * 2.375 * 2.083 * 0.146


* * * * * * * * EMT


1/2" * * 29 * * 0.706 * 0.622 * * * * 0.042
3/4" * * 44 * * 0.922 * 0.824 * 0.049
1" * * * 65 * * 1.163 * 1.049 * * * * 0.057
1 1/4" * 96 * * 1.510 * 1.380 * 0.065
1 1/2" *111 * * 1.740 * 1.610 * 0.065
2" * * *141 * * 2.197 * 2.067 * 0.065


Steel pipe
* * * * * * * *Sch * Sch * *Sch * *Sch
* * * * OD * * *5 * * 10 * * 40 * * 80
1/2 * 0.840 *0.065 *0.083 *0.109 *0.147
3/4 * 1.050 *0.065 *0.083 *0.113 *0.154
1 * * 1.315 *0.065 *0.190 *0.133 *0.179
1 1/4 1.660 *0.065 *0.109 *0.140 *0.140
1 1/2 1.900 *0.065 *0.109 *0.145 *0.200
2 * * 2.375 *0.065 *0.109 *0.154 *0.218


As can be seen, GRC is roughly same weight as, but still slightly
lighter (thinner wall) than Sch 40 pipe but they have same OD


--


Thanks for your informative reply. What are the thread specs? Std

NPT or
something else. The couplings I have seen for GRC seen to be non tapered..
Is GRC meant to be liquid tight to prevent moisture entering?
Thanks


A recently published NEC book will tell you about all of the trade
metallic and NMC conduit. You should be able to find one at any
hardware store.
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Default Rigid Conduit vs Regular Iron pipe

In article ,
Ned Simmons wrote:

On Sat, 02 Mar 2013 15:11:34 -0500, wrote:

On Sat, 02 Mar 2013 07:29:27 -0800, Pilgrim
wrote:



--

Thanks for your informative reply. What are the thread specs? Std NPT or
something else. The couplings I have seen for GRC seen to be non tapered.
Is GRC meant to be liquid tight to prevent moisture entering?
Thanks

CP

GRC uses a NPS thread, not NPT (National Pipe Straight) not (National
Pipe Tapered)


I think this misunderstanding has been repeated here several times.
The threads on the ends of rigid conduit are tapered pipe threads.
Female threads on conduit fittings are often straight threads.

Per Wheatland:
"Wheatland’s Galvanized steel Rigid Metal Conduit
(RMC) is manufactured in accordance with the latest
specifications and standards of ANSI® C80.1, UL-6,
and federal specification WW-C-581. The pitch of
RMC threads conforms to the American National
Standard for Pipe Threads, General Purpose (Inch),
ANSI/ASME B1.20.1. The taper of threads is 3/4 inch
per foot (1 in 16). "

From NFPA 70 - 2008:
"344.28 Reaming and Threading. All cut ends shall be
reamed or otherwise finished to remove rough edges.
Where conduit is threaded in the field, a standard cutting
die with a 1 in 16taper (3/4-in. taper per foot) shall be used.
FPN: See ANSI/ASME B.1.20.1-1983, Standard for Pipe
Threads, General Purpose (Inch)."


Thanks. This is the info I was looking for.

CP
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Default Rigid Conduit vs Regular Iron pipe

On Sat, 02 Mar 2013 15:08:28 -0500, wrote:

On Sat, 02 Mar 2013 03:36:14 -0800, Gunner
wrote:

On Fri, 1 Mar 2013 15:40:45 -0800 (PST), "
wrote:

On Mar 1, 4:11*pm, Pilgrim wrote:
Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP


You can bend conduit with an inexpensive tool. Conduit is much
lighter and cheaper than pipe.

Dan


Conduit is thin wall material. It cant be threaded with any
suitability. Its not designed to carry anything other than wire.



You are thinking EMT - electro-metalic tubing - not Rigid Conduit.


You are absolutely correct. I glossed over the first "rigid"
My appologies indeed.

A definate Brain Fart on my part.

Gunner



Rigid conduit is thick, and is threaded for EVERY use.
1" rigid conduit is .126 inch wall. The thread is generally a straight
thread instead of a tapered thread on pipe.
1 inch Sched 40 iron pipe is .130" wall thickness.
2 inch rigid is .146 inch wall thickness, while sched 40 iron is .150
nominal thickness

Rigid steel conduit can be galvanized (in and out) electro galvanised
(outer only) with organic coated interior, or organic coated in and
out - and Rigid conduit can also be aluminum or stainless steel or red
brass.

RMC has a smoother interior than pipe - it is a rolled, electrically
welded seam tubing with uniform wall thickness and a defect free
interior surface - required for pulling wire.

Black Iron Pipe is made from ductile iron - not steel (generally
speaking).

Pipe is thick wall and is designed to be threaded and then threaded
into pipe fixtures...

Its capable of carrying significant pressures

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie


The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie
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Default Rigid Conduit vs Regular Iron pipe

On Sun, 03 Mar 2013 01:26:04 -0500, "Michael A. Terrell"
wrote:


Gunner wrote:

On Sat, 02 Mar 2013 15:11:02 -0500, "Michael A. Terrell"
wrote:


Gunner wrote:

On Fri, 01 Mar 2013 19:31:04 -0500, Bob Engelhardt
wrote:

On 3/1/2013 6:40 PM, wrote:
On Mar 1, 4:11 pm, wrote:
Can any one tell me what the difference between _rigid_ conduit and iron
pipe? ... [emphasis added]

You can bend conduit with an inexpensive tool. Conduit is much
lighter and cheaper than pipe.

I've never seen rigid bent, only light & intermediate. Rigid is heavy &
threaded. It uses preformed sweeps & boxes to make turns. AFAIK

Bob

Only if you dont have a pipe bender for rigid. I have several
differnet types of hand benders for rigid.


Rigid is fun to bend. You definately need more thean a three foot
handle on the bender. Have you ever used rigid aluminum conduit?


Ive heard of aluminum conduit..but give its properties...Id stay way
way away from it.

I did help install a hydrogen furnace (50 feet long) using stainless
steel 1" pipe some years ago though. Some really odd pipe dope in
that project.



They used it in a juice processing plant near here, along with a lot
of stainless pipes for the juice. I ended up with some leftover 3/4"
aluminum conduit that had surface damage.


Whats it like to bend and how is the surface treated? Sounds like
White Fur country. That nasty white fur that grows on unanodized
aluminum as it eats its way in.....


The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie
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Default Rigid Conduit vs Regular Iron pipe

On Fri, 01 Mar 2013 13:11:23 -0800, Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP


Iron pipe is pressure rated. I did see anyone stae that.


Remove 333 to reply
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Default Rigid Conduit vs Regular Iron pipe


Gunner wrote:

On Sun, 03 Mar 2013 01:26:04 -0500, "Michael A. Terrell"
? wrote:

?
?Gunner wrote:
??
?? On Sat, 02 Mar 2013 15:11:02 -0500, "Michael A. Terrell"
?? ? wrote:
??
?? ?
?? ?Gunner wrote:
?? ??
?? ?? On Fri, 01 Mar 2013 19:31:04 -0500, Bob Engelhardt
?? ?? ? wrote:
?? ??
?? ?? ?On 3/1/2013 6:40 PM, wrote:
?? ?? ?? On Mar 1, 4:11 pm, ? wrote:
?? ?? ??? Can any one tell me what the difference between _rigid_ conduit and iron
?? ?? ??? pipe? ... [emphasis added]
?? ?? ?
?? ?? ?? You can bend conduit with an inexpensive tool. Conduit is much
?? ?? ?? lighter and cheaper than pipe.
?? ?? ?
?? ?? ?I've never seen rigid bent, only light ? intermediate. Rigid is heavy ?
?? ?? ?threaded. It uses preformed sweeps ? boxes to make turns. AFAIK
?? ?? ?
?? ?? ?Bob
?? ??
?? ?? Only if you dont have a pipe bender for rigid. I have several
?? ?? differnet types of hand benders for rigid.
?? ?
?? ?
?? ? Rigid is fun to bend. You definately need more thean a three foot
?? ?handle on the bender. Have you ever used rigid aluminum conduit?
??
?? Ive heard of aluminum conduit..but give its properties...Id stay way
?? way away from it.
??
?? I did help install a hydrogen furnace (50 feet long) using stainless
?? steel 1" pipe some years ago though. Some really odd pipe dope in
?? that project.
?
?
? They used it in a juice processing plant near here, along with a lot
?of stainless pipes for the juice. I ended up with some leftover 3/4"
?aluminum conduit that had surface damage.

Whats it like to bend and how is the surface treated? Sounds like
White Fur country. That nasty white fur that grows on unanodized
aluminum as it eats its way in.....



The stuff is soft compared to iron. It can be bent by hand, and has
anodized surface. I had about 40 to 45 pieces, till my dad found it in
my stockpile and bent it into a pile of scrap to sell for the aluminum.
I had told him he could use any of the EMT scraps he wanted, but to
leave all the 10' pieces alone. He wasted about $1000 worth of pipe &
conduit.

I only manged to find a few pieces he missed. He would step on it in
the middle and fold it in half. It brought about 15% of the price it
would have sold for as conduit.


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Default Rigid Conduit vs Regular Iron pipe

On Sun, 03 Mar 2013 19:48:43 -0500, "Michael A. Terrell"
wrote:


Gunner wrote:

On Sun, 03 Mar 2013 01:26:04 -0500, "Michael A. Terrell"
? wrote:

?
?Gunner wrote:
??
?? On Sat, 02 Mar 2013 15:11:02 -0500, "Michael A. Terrell"
?? ? wrote:
??
?? ?
?? ?Gunner wrote:
?? ??
?? ?? On Fri, 01 Mar 2013 19:31:04 -0500, Bob Engelhardt
?? ?? ? wrote:
?? ??
?? ?? ?On 3/1/2013 6:40 PM, wrote:
?? ?? ?? On Mar 1, 4:11 pm, ? wrote:
?? ?? ??? Can any one tell me what the difference between _rigid_ conduit and iron
?? ?? ??? pipe? ... [emphasis added]
?? ?? ?
?? ?? ?? You can bend conduit with an inexpensive tool. Conduit is much
?? ?? ?? lighter and cheaper than pipe.
?? ?? ?
?? ?? ?I've never seen rigid bent, only light ? intermediate. Rigid is heavy ?
?? ?? ?threaded. It uses preformed sweeps ? boxes to make turns. AFAIK
?? ?? ?
?? ?? ?Bob
?? ??
?? ?? Only if you dont have a pipe bender for rigid. I have several
?? ?? differnet types of hand benders for rigid.
?? ?
?? ?
?? ? Rigid is fun to bend. You definately need more thean a three foot
?? ?handle on the bender. Have you ever used rigid aluminum conduit?
??
?? Ive heard of aluminum conduit..but give its properties...Id stay way
?? way away from it.
??
?? I did help install a hydrogen furnace (50 feet long) using stainless
?? steel 1" pipe some years ago though. Some really odd pipe dope in
?? that project.
?
?
? They used it in a juice processing plant near here, along with a lot
?of stainless pipes for the juice. I ended up with some leftover 3/4"
?aluminum conduit that had surface damage.

Whats it like to bend and how is the surface treated? Sounds like
White Fur country. That nasty white fur that grows on unanodized
aluminum as it eats its way in.....



The stuff is soft compared to iron. It can be bent by hand, and has
anodized surface. I had about 40 to 45 pieces, till my dad found it in
my stockpile and bent it into a pile of scrap to sell for the aluminum.
I had told him he could use any of the EMT scraps he wanted, but to
leave all the 10' pieces alone. He wasted about $1000 worth of pipe &
conduit.

I only manged to find a few pieces he missed. He would step on it in
the middle and fold it in half. It brought about 15% of the price it
would have sold for as conduit.



OUUUCHH!!!!!


The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie
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Default Rigid Conduit vs Regular Iron pipe

On Mar 3, 2:58*pm, Randy wrote:
On Fri, 01 Mar 2013 13:11:23 -0800, Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA


Iron pipe is pressure rated. * I did see anyone stae that.


Well, no one really stated a lot of things for that matter. If you
want to go there. You have to have the sizes/uses of that pipe. Is
it black iron or seamless?
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Default Rigid Conduit vs Regular Iron pipe

In article
, Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.


It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn
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"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.


It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn


Is either better for structural uses?
jsw


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Default Rigid Conduit vs Regular Iron pipe

On Fri, 01 Mar 2013 13:11:23 -0800, Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP



Hey CP,

Never given it much thought, but to me "rigid" is always galvanized,
while "pipe" is black unless specified. In most cases for electrical
use, aluminum can be substituted for "rigid", but the cost needs to be
offset in some way.

Hope you get some better answers.

Take care.

Brian Lawson,
Bothwell, Ontario.


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Default Rigid Conduit vs Regular Iron pipe

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.


It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn


Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.
  #27   Report Post  
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dpb dpb is offline
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Posts: 12,595
Default Rigid Conduit vs Regular Iron pipe

On 3/5/2013 10:18 AM, Jim Wilkins wrote:
"Joe wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron pipe? ....

....

Is either better for structural uses?

....

Neither is specifically intended although a lot is used for railings,
etc., etc., etc., ...

Have to judge by comparative wall thickness and intended use/loading,
etc. As noted earlier, GRC is slightly lighter than Sch 40 pipe of the
same nominal dimension so will be somewhat less strong based solely on
that difference in resultant bending moments, etc.

Rigid has an appearance benefit of generally a smoother surface but
that's purely aesthetics, not functional.

--
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Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 12:26:45 -0600, dpb wrote:

On 3/5/2013 10:18 AM, Jim Wilkins wrote:
"Joe wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron pipe? ....

...

Is either better for structural uses?

...

Neither is specifically intended although a lot is used for railings,
etc., etc., etc., ...

Have to judge by comparative wall thickness and intended use/loading,
etc. As noted earlier, GRC is slightly lighter than Sch 40 pipe of the
same nominal dimension so will be somewhat less strong based solely on
that difference in resultant bending moments, etc.

Rigid has an appearance benefit of generally a smoother surface but
that's purely aesthetics, not functional.

For something like a railing where form is more important than
function - in that you want something big enough to fall well to hand
- so 2 or 2 1/4", the strength of iron pipe is way more than necessary
- so the advantage of smooth, slightly less strong rigid conduit makes
it the "better" material for that job. Lots lf other places where the
small difference in strength is a non-issue, as the size used for
aesthetic or other reasons, is overkill even for the weaker material.
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Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 13:22:02 -0500, wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
.. .
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn


Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.


ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

--
Ned Simmons
  #30   Report Post  
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Posts: 18,538
Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500, wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
. ..
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.


ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.

One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.


  #31   Report Post  
Posted to rec.crafts.metalworking
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Posts: 2,163
Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 18:09:40 -0500, wrote:

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500,
wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
.. .
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.


ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.

One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.

I recently bought a black iron nipple to modify into something else.
It was 1/2" pipe, 4 inches long. I parted off the threads on one end
and turned it to .812. I then welded (actually I should say tried)one
end into a mild steel plate. When turning the pipe it looked like
there was porosity in the material but I told myself it must just be
hardness differences in the material that gave it the appearance of
having tiny holes in it. But when welding it the stuff acted like I
was welding without shielding gas. All sorts of bubbles blowing out of
the weld. So I tried running a bead on just the pipe away from the
steel plate and the same thing happened. Running a bead on the steel
plate worked just fine. It was the crappy black iron pipe.
Eric
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Posts: 220
Default Rigid Conduit vs Regular Iron pipe

On Sun, 03 Mar 2013 14:58:11 -0500, Randy wrote:

On Fri, 01 Mar 2013 13:11:23 -0800, Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and iron
pipe? inner finish threads on the pipe and in the fittings and any other
significant differences.
TIA

CP


Iron pipe is pressure rated. I did see anyone stae that.


That should have read..... "I did NOT see anyone state that"
Remove 333 to reply.
Randy
  #33   Report Post  
Posted to rec.crafts.metalworking
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Posts: 220
Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:


Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.


ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.


I found that out awhile back, I was welding up platforms and putting
on railings and found I could buy bare steel pipe. The stuff I got
welded nicely. Came in 21 foot lenghts, same as plumbing pipe. Not
sure what the ratings were.
Remove 333 to reply.
Randy
  #34   Report Post  
Posted to rec.crafts.metalworking
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Posts: 1,803
Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 18:09:40 -0500, wrote:

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500,
wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
.. .
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.


ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.


An imaginary future disaster is not evidence that there's currently a
problem.


One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.


Nor is an opinionated plumber. (There's one for the Department of
Redundancy Department.)

--
Ned Simmons
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Posts: 18,538
Default Rigid Conduit vs Regular Iron pipe

On Wed, 06 Mar 2013 10:42:29 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 18:09:40 -0500, wrote:

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500,
wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
. ..
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.

ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.


An imaginary future disaster is not evidence that there's currently a
problem.


One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.


Nor is an opinionated plumber. (There's one for the Department of
Redundancy Department.)

Well, in building airplanes we have found a LOT of so-called 4130 is
nothing close to spec, and also a lot of 6061T6 aluminum. It's all
stamped with the proper identification, but the 6061t6 will crack if
bent to even twice the allowable radius, and doesn't weld worth crap,
and the 4130 is WAY below spec for tensile and yield.

Don't want to fly with that - so we don't accept chinese material
without independent confirmation of quality - and then only if
American, Canadian, or European product is not available.


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Posts: 416
Default Rigid Conduit vs Regular Iron pipe

In article , Jim Wilkins
wrote:

"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.


It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn


Is either better for structural uses?


No idea; neither is made or rated for structural use.

Depending on what one means by "structural use", if the use is serious,
I wouldn't use anything not so rated.

A very high rated burst pressure would be a pretty good indication,
though.

Joe Gwinn
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Posts: 1,803
Default Rigid Conduit vs Regular Iron pipe

On Sat, 09 Mar 2013 12:37:51 -0500, Joe Gwinn
wrote:

In article , Jim Wilkins
wrote:

"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn


Is either better for structural uses?


No idea; neither is made or rated for structural use.


Common black "iron" pipe is, as I mentioned in another post, qualified
to ASTM A53, and suitable for structural use.

A53 grade B and A36 (the most common steel for structural rolled
shapes) don't differ much in how they're treated by the AISC Steel
Construction Manual.


--
Ned Simmons
  #39   Report Post  
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Posts: 1,346
Default Rigid Conduit vs Regular Iron pipe

On Tue, 05 Mar 2013 16:39:01 -0800, wrote:

On Tue, 05 Mar 2013 18:09:40 -0500,
wrote:

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500,
wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
. ..
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.

ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.

Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.

One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.

I recently bought a black iron nipple to modify into something else.
It was 1/2" pipe, 4 inches long. I parted off the threads on one end
and turned it to .812. I then welded (actually I should say tried)one
end into a mild steel plate. When turning the pipe it looked like
there was porosity in the material but I told myself it must just be
hardness differences in the material that gave it the appearance of
having tiny holes in it. But when welding it the stuff acted like I
was welding without shielding gas. All sorts of bubbles blowing out of
the weld. So I tried running a bead on just the pipe away from the
steel plate and the same thing happened. Running a bead on the steel
plate worked just fine. It was the crappy black iron pipe.
Eric


I do a LOT of air lines in machine shops..and use black pipe
exclusively. For the past 10 or more years Ive been buying my pipe
from a distributor called Fergusens Supply..which has outlets throught
California. Good prices, good service and good pipe.

On a job a couple weeks ago..I ran out of pipe..... and picked up a
piece of 1/2", only 6' long for the same price I get my 20' joints,
from another source. That **** was ****ing nasty to work with. Didnt
thread worth a ****, the threads that were made were broken in places
and it took 2x the effort to spin the threader on it

I dont know where it came from...but I certainly will recognize it
again if I see it. Had a glossy clear coating and white printing on
it. It was Pretty..but that was the only good thing I can think of
saying about it.

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie
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Posts: 113
Default Rigid Conduit vs Regular Iron pipe

On Sat, 09 Mar 2013 19:54:10 -0800, Gunner
wrote:

On Tue, 05 Mar 2013 16:39:01 -0800, wrote:

On Tue, 05 Mar 2013 18:09:40 -0500,
wrote:

On Tue, 05 Mar 2013 17:06:59 -0500, Ned Simmons
wrote:

On Tue, 05 Mar 2013 13:22:02 -0500,
wrote:

On Tue, 5 Mar 2013 11:18:31 -0500, "Jim Wilkins"
wrote:

"Joe Gwinn" wrote in message
...
In article
,
Pilgrim
wrote:

Can any one tell me what the difference between rigid conduit and
iron
pipe? inner finish threads on the pipe and in the fittings and any
other
significant differences.

It's not a good idea to use iron water pipe for rigid conduit, even
though the sizes are similar, because water pipe usually has a rough
and sharp longitudinal welded seam that will cut through the wire
insulation during pulling. Conduit, being intended for wire, has a
smooth-walled bore.

Joe Gwinn

Is either better for structural uses?
jsw

Yes and no -depends. Black Iron water/gas pipe today is pretty much
an unknown, quality-wise. Cheap rough Chinese crap in many cases - in
which case Rigid conduit MAY be stronger/more predictable.

ASTM A53 is the standard that covers common steel plumbing pipe in the
US. Even Home Depot and Lowes cite that spec for the black pipe they
sell, so I don't think it's fair to say that the quality of black pipe
is an unknown. It may not be exactly what one might want for a
particular purpose, but it is qualified for its intended use.

The steel dealers around here stock uncoated A53 pipe, which is much
better looking than the black stuff, and preferable if you're welding
or painting it.
Just because it SAYS it meets ASTM A53 spec doesn't necessarily mean
it DOES, you know. A lot of "counterfiet" material around these days.
And the crap will really hit the fan when they prove it was
substandard pipe that caused a gas explosion that levelled a city
block.

One reason given why a pipefitter would not do my external gas barBQ
line in black pipe was he "won't work with that ****" anymore.

I recently bought a black iron nipple to modify into something else.
It was 1/2" pipe, 4 inches long. I parted off the threads on one end
and turned it to .812. I then welded (actually I should say tried)one
end into a mild steel plate. When turning the pipe it looked like
there was porosity in the material but I told myself it must just be
hardness differences in the material that gave it the appearance of
having tiny holes in it. But when welding it the stuff acted like I
was welding without shielding gas. All sorts of bubbles blowing out of
the weld. So I tried running a bead on just the pipe away from the
steel plate and the same thing happened. Running a bead on the steel
plate worked just fine. It was the crappy black iron pipe.
Eric


I do a LOT of air lines in machine shops..and use black pipe
exclusively. For the past 10 or more years Ive been buying my pipe
from a distributor called Fergusens Supply..which has outlets throught
California. Good prices, good service and good pipe.

On a job a couple weeks ago..I ran out of pipe..... and picked up a
piece of 1/2", only 6' long for the same price I get my 20' joints,
from another source. That **** was ****ing nasty to work with. Didnt
thread worth a ****, the threads that were made were broken in places
and it took 2x the effort to spin the threader on it

I dont know where it came from...but I certainly will recognize it
again if I see it. Had a glossy clear coating and white printing on
it. It was Pretty..but that was the only good thing I can think of
saying about it.

Gunner

Couple years ago I bought a IIRC six foot length of 3/4" black pipe
for use as a handrail at the BORG. I wanted it cut and both ct ends
threaded and was informed that there would be no charge for this
service and I must say that I couldn't have done the work any better
myself, this got me a very nice smile from the young lady when I so
informed her.
---

Gerry :-)}
London,Canada
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