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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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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 |
#2
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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 |
#3
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Rigid Conduit vs Regular Iron pipe
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#4
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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 |
#5
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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 |
#6
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Rigid Conduit vs Regular Iron pipe
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. 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 |
#7
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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 -- |
#8
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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 |
#9
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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 |
#10
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Rigid Conduit vs Regular Iron pipe
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? |
#11
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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) |
#12
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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. |
#13
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Rigid Conduit vs Regular Iron pipe
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#14
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Rigid Conduit vs Regular Iron pipe
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#15
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Rigid Conduit vs Regular Iron pipe
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. 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 |
#16
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Rigid Conduit vs Regular Iron pipe
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#17
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Rigid Conduit vs Regular Iron pipe
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. |
#18
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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 |
#19
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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 |
#21
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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 |
#22
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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? |
#23
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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 |
#24
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Rigid Conduit vs Regular Iron pipe
"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 |
#25
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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. |
#26
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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
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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. -- |
#28
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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. |
#29
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Rigid Conduit vs Regular Iron pipe
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#30
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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
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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 |
#32
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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
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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
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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 |
#35
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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. |
#36
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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 |
#37
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Rigid Conduit vs Regular Iron pipe
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#38
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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
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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 |
#40
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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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