[Tim W[_2_]]

Just ordering some stuff from BES and browsed into the gas cooker bayonet
section.

They sell a kit of parts that contains:

1/2" standard cooker hose kit. Kit No.1 consists of :
6038 4' x 1/2" bayonet cooker hose
6775 15 mm end feed x 1/2" BSP T straight male adaptor, brass
0621 Plug-in angle socket
6048 Angled wall connector
9543 Cooker stability chain
7452 Wall plug, brown x 2
6366 F x F 90°elbow, malleable iron
10994 Pozi woodscrew x 2
6377 M x F 90°elbow, malleable iron


0621 is one of the usual 1/2" BSP-taper jobbies. Fine. But the bit to which
it connects, 6048 is described he

http://www.bes.co.uk/product/10~NG~2...onnectors.html

as a parallel thread.

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.

Especially as the same page has many similar wall connectors with taper
threads.

What gives?

And why do they lob a couple of iron fittings in?

--
Tim Watts

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[Tim W[_2_]]

Tim W
wibbled on Tuesday 20 October 2009 22:57


And why do they lob a couple of iron fittings in?


OK - just worked that one out - presumably for the host to cooker
attachment...

--
Tim Watts

This space intentionally left blank...

[Onetap]

On 20 Oct, 22:57, Tim W wrote:

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.

The male threads taper, the female are parallel.

[Tim W[_2_]]

Onetap
wibbled on Tuesday 20 October 2009 23:33

On 20 Oct, 22:57, Tim W wrote:

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.

The male threads taper, the female are parallel.

OK.

So when would you use a male-taper *and* a female-taper together?

Cheers

Tim

--
Tim Watts

This space intentionally left blank...

[Grimly Curmudgeon]

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Tim W saying
something like:

So when would you use a male-taper *and* a female-taper together?

Only when stuck?
Fwiw, I can't recall a single one like that.

[Bob Minchin[_2_]]

Tim W wrote:
Onetap
wibbled on Tuesday 20 October 2009 23:33

On 20 Oct, 22:57, Tim W wrote:

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.
The male threads taper, the female are parallel.

OK.

So when would you use a male-taper *and* a female-taper together?

Cheers

Tim

You don't!

Bob

[Tim W[_2_]]

Grimly Curmudgeon
wibbled on Wednesday 21 October 2009 07:01

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Tim W saying
something like:

So when would you use a male-taper *and* a female-taper together?

Only when stuck?
Fwiw, I can't recall a single one like that.

So presumably, you might also use (in other contexts, perhaps a water tap) a
parallel male into a taper female?

For some reason, I'd always assumed taper male and female went together...

--
Tim Watts

This space intentionally left blank...

[Tim W[_2_]]

Baz
wibbled on Wednesday 21 October 2009 14:01


First Choice would be Male Taper and Female Taper.

That's what I thought...

Second Choice would be Male Taper and Female Parallel.

It would be interesting to hear a GasSafe take on this (hint ;- ). It is
presumably valid if BES are selling kits like that... But I'm still a
little puzzelled - especially as now there is a slight divergence of
opinion here.

Male Parallel to Female Taper. Is a bodge and only if you have too.

That would be "I've run out of tap connectors, but I've found something that
sort of fits!"

Male Parallel to Female Parallel is fine, as long as the correct type of
seal is used. And you don't have to line anything up.

Aka taps.

Interesting...

Cheers

Tim

--
Tim Watts

This space intentionally left blank...

[Baz]

"Tim W" wrote in message
...
Baz
wibbled on Wednesday 21 October 2009 14:01


First Choice would be Male Taper and Female Taper.

That's what I thought...

Second Choice would be Male Taper and Female Parallel.

It would be interesting to hear a GasSafe take on this (hint ;- ). It is
presumably valid if BES are selling kits like that... But I'm still a
little puzzelled - especially as now there is a slight divergence of
opinion here.

BS21.

Standard No BS21:1985
Title of Standard Specification for pipe threads for tubes and
fittings where pressure-tight joints are made on the threads (metric
dimensions)
ISBN 058014556 5
Date of Publication 30/09/85
Approx Pages 20
Description Threads, Pipes, Parallel threads, Taper threads, External
threads, Internal threads, Screwed fittings, Pipe fittings, Dimensions,
Dimensional tolerances, Designations, Pressure pipes, Thread gauges,
Longscrews, Gas-powered devices, Pipe couplings, Thread
Cross references BS 919:Part 2, BS 1387, BS 2779
International Equiv (If Applicable ) ISO 7-2:1982
Replaces Standards : BS21:1973
Replacement Notes
Now Replaced By BS EN 10226-1:2004
Replaced by Notes Partially replaced by BS EN 10226-1:2004.
Committee Ref ISE/9




Male Parallel to Female Taper. Is a bodge and only if you have too.

That would be "I've run out of tap connectors, but I've found something
that
sort of fits!"

Male Parallel to Female Parallel is fine, as long as the correct type of
seal is used. And you don't have to line anything up.

Aka taps.

Interesting...

Cheers

Tim

--
Tim Watts

This space intentionally left blank...

[Tim W[_2_]]

John Rumm
wibbled on Wednesday 21 October 2009 20:08

Tim W wrote:
Just ordering some stuff from BES and browsed into the gas cooker bayonet
section.

They sell a kit of parts that contains:

1/2" standard cooker hose kit. Kit No.1 consists of :
6038 4' x 1/2" bayonet cooker hose
6775 15 mm end feed x 1/2" BSP T straight male adaptor, brass
0621 Plug-in angle socket
6048 Angled wall connector
9543 Cooker stability chain
7452 Wall plug, brown x 2
6366 F x F 90°elbow, malleable iron
10994 Pozi woodscrew x 2
6377 M x F 90°elbow, malleable iron


0621 is one of the usual 1/2" BSP-taper jobbies. Fine. But the bit to
which it connects, 6048 is described he


http://www.bes.co.uk/product/10~NG~2...onnectors.html

as a parallel thread.

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.

The point of taper (no pun intended!) fittings is when you want a seal
on the threads - hence you want to create an interference fit at some
point in the assembly process, so your sealing tape can do its stuff.
This can be done most commonly by screwing a taper male into a parallel
female. The reverse would also work however.

Thanks John. Isn't it weird how you can go round with a notion and never
question it.

I've done plenty of BSP taper joints - just never had to actually buy them
(ie re-did ones that were in place or put together bits someone else had
bought...)




--
Tim Watts

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