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Compression fittings for 20mm MDPE
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letsh...@gmail.com
Nov 5, 2012, 1:57:37 PM11/5/12
to
I want to use metal compression fittings rather than the standard push-fit MDPE couplings on 20mm (I/D) blue MDPE pipe.
Can I use what is described as standard 22mm compression fittings where 22mm presumably is the O/D?
Incidentally, I have a brass stopcock for use with 20mm ploy pipe and it has 20 cast into the side of it -suggesting that 20mm MDPE might require a special type of compression fitting.
Can someone help clarify please?
Can I use what is described as standard 22mm compression fittings where 22mm presumably is the O/D?
Incidentally, I have a brass stopcock for use with 20mm ploy pipe and it has 20 cast into the side of it -suggesting that 20mm MDPE might require a special type of compression fitting.
Can someone help clarify please?
andrew
Nov 5, 2012, 4:43:29 PM11/5/12
to
http://www.stevensonplumbing.co.uk/20mm-mdpe-conversion-olive.html
A
harry
Nov 6, 2012, 3:49:11 AM11/6/12
to
size depends on the thickness of the wall. All 22mm pipe are the same
OD but different bores depending on the pressure rating of the pipe.
On many plastic pipes, if you are using a compression fitting, you
need a stiffer plastic/metal insert goes inside the pipe to stop it
"collapsing". ie so you get the proper "pinch" effect as you tighten
the nut.
A few are non standard so you can't use a compression fitting, you
will need to check.
BTW there are several different sorts of plastic fittings for the
blue MDPE pipe from different manufacturers. But I know what you
mean, they all seem a bit dodgy.
Most have O rings that can be damaged as you assemble the fitting
round the pipe.
fred
Nov 7, 2012, 5:14:48 AM11/7/12
to
In article
<7ba9bd3d-7dea-440f...@y6g2000vbb.googlegroups.com>,
harry <harry...@btinternet.com> writes
Metric sized copper and MDPE are not in any way peculiar, their quoted
size is the external diameter of the pipe ie. the size of the fitting or
olive required to mate with them.
Andrew has kindly pointed to required olive.
>On many plastic pipes, if you are using a compression fitting, you
>need a stiffer plastic/metal insert goes inside the pipe to stop it
>"collapsing". ie so you get the proper "pinch" effect as you tighten
>the nut.
That much is true.
--
fred
it's a ba-na-na . . . .
<7ba9bd3d-7dea-440f...@y6g2000vbb.googlegroups.com>,
harry <harry...@btinternet.com> writes
>
>Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
>size depends on the thickness of the wall. All 22mm pipe are the same
>OD but different bores depending on the pressure rating of the pipe.
>
What a confusing and contradictory statement.
>Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
>size depends on the thickness of the wall. All 22mm pipe are the same
>OD but different bores depending on the pressure rating of the pipe.
>
Metric sized copper and MDPE are not in any way peculiar, their quoted
size is the external diameter of the pipe ie. the size of the fitting or
olive required to mate with them.
Andrew has kindly pointed to required olive.
>On many plastic pipes, if you are using a compression fitting, you
>need a stiffer plastic/metal insert goes inside the pipe to stop it
>"collapsing". ie so you get the proper "pinch" effect as you tighten
>the nut.
--
fred
it's a ba-na-na . . . .
harry
Nov 7, 2012, 5:23:14 AM11/7/12
to
On Nov 7, 10:14 am, fred <n...@for.mail> wrote:
> In article
> <7ba9bd3d-7dea-440f-9aa1-f0353e020...@y6g2000vbb.googlegroups.com>,
> harry <harry130...@btinternet.com> writes
domestic houses.
This is only a small part of what's available.
There is a whole other range of pipes used in industry for chemicals,
steam, higher pressures, underground, annealed, hard drawn. etc.
Clearly stuff you know nothing about.
> In article
> <7ba9bd3d-7dea-440f-9aa1-f0353e020...@y6g2000vbb.googlegroups.com>,
> harry <harry130...@btinternet.com> writes
>
> >Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
> >size depends on the thickness of the wall. All 22mm pipe are the same
> >OD but different bores depending on the pressure rating of the pipe.
>
> What a confusing and contradictory statement.
>
> Metric sized copper and MDPE are not in any way peculiar, their quoted
> size is the external diameter of the pipe ie. the size of the fitting or
> olive required to mate with them.
>
> Andrew has kindly pointed to required olive.
>
> >On many plastic pipes, if you are using a compression fitting, you
> >need a stiffer plastic/metal insert goes inside the pipe to stop it
> >"collapsing". ie so you get the proper "pinch" effect as you tighten
> >the nut.
>
> That much is true.
> --
You only think that because you only see/know about pipe used in
> >Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
> >size depends on the thickness of the wall. All 22mm pipe are the same
> >OD but different bores depending on the pressure rating of the pipe.
>
> What a confusing and contradictory statement.
>
> Metric sized copper and MDPE are not in any way peculiar, their quoted
> size is the external diameter of the pipe ie. the size of the fitting or
> olive required to mate with them.
>
> Andrew has kindly pointed to required olive.
>
> >On many plastic pipes, if you are using a compression fitting, you
> >need a stiffer plastic/metal insert goes inside the pipe to stop it
> >"collapsing". ie so you get the proper "pinch" effect as you tighten
> >the nut.
>
> That much is true.
> --
domestic houses.
This is only a small part of what's available.
There is a whole other range of pipes used in industry for chemicals,
steam, higher pressures, underground, annealed, hard drawn. etc.
Clearly stuff you know nothing about.
fred
Nov 7, 2012, 6:30:27 AM11/7/12
to
In article
<01451b19-f29b-42ef...@j12g2000vbm.googlegroups.com>,
harry <harry...@btinternet.com> writes
There's no need to confuse him or bore him with unnecessary detail.
The main issue was your contradictory and confusing statements, "22mm is
the nominal bore size" and "All 22mm pipe are the same OD", clearly
those 2 statements are mutually exclusive.
<01451b19-f29b-42ef...@j12g2000vbm.googlegroups.com>,
harry <harry...@btinternet.com> writes
>On Nov 7, 10:14 am, fred <n...@for.mail> wrote:
>> In article
>> <7ba9bd3d-7dea-440f-9aa1-f0353e020...@y6g2000vbb.googlegroups.com>,
>> harry <harry130...@btinternet.com> writes
>>
>> >Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
>> >size depends on the thickness of the wall. All 22mm pipe are the same
>> >OD but different bores depending on the pressure rating of the pipe.
>>
>> What a confusing and contradictory statement.
>>
>> Metric sized copper and MDPE are not in any way peculiar, their quoted
>> size is the external diameter of the pipe ie. the size of the fitting or
>> olive required to mate with them.
>>
>> Andrew has kindly pointed to required olive.
>>
>> >On many plastic pipes, if you are using a compression fitting, you
>> >need a stiffer plastic/metal insert goes inside the pipe to stop it
>> >"collapsing". ie so you get the proper "pinch" effect as you tighten
>> >the nut.
>>
>> That much is true.
>> --
>
>You only think that because you only see/know about pipe used in
>domestic houses.
And what do you think his enquiry is about?
>> In article
>> <7ba9bd3d-7dea-440f-9aa1-f0353e020...@y6g2000vbb.googlegroups.com>,
>> harry <harry130...@btinternet.com> writes
>>
>> >Pipe sizes are peculiar. 22mm is the nominal bore size. But the bore
>> >size depends on the thickness of the wall. All 22mm pipe are the same
>> >OD but different bores depending on the pressure rating of the pipe.
>>
>> What a confusing and contradictory statement.
>>
>> Metric sized copper and MDPE are not in any way peculiar, their quoted
>> size is the external diameter of the pipe ie. the size of the fitting or
>> olive required to mate with them.
>>
>> Andrew has kindly pointed to required olive.
>>
>> >On many plastic pipes, if you are using a compression fitting, you
>> >need a stiffer plastic/metal insert goes inside the pipe to stop it
>> >"collapsing". ie so you get the proper "pinch" effect as you tighten
>> >the nut.
>>
>> That much is true.
>> --
>
>You only think that because you only see/know about pipe used in
>domestic houses.
There's no need to confuse him or bore him with unnecessary detail.
The main issue was your contradictory and confusing statements, "22mm is
the nominal bore size" and "All 22mm pipe are the same OD", clearly
those 2 statements are mutually exclusive.
harry
Nov 7, 2012, 10:19:30 AM11/7/12
to
On Nov 7, 11:30 am, fred <n...@for.mail> wrote:
> In article
> <01451b19-f29b-42ef-bc35-713b5a7e0...@j12g2000vbm.googlegroups.com>,
> In article
> harry <harry130...@btinternet.com> writes
The OD is always the same so that the pipe fittings always fit.
The actual bore varies depending on the wall thickness/pressure rating
of the pipe.
The pipe fittings are higher pressure for ease of manufacture and fit
a range of pipes.
fred
Nov 7, 2012, 11:04:53 AM11/7/12
to
In article
<5ec661f8-993b-4982...@l18g2000vbv.googlegroups.com>,
harry <harry...@btinternet.com> writes
wrong:
22mm is not the "nominal bore size" of the pipe as you stated, it is the
outside diameter.
The o/p will be using 20mm o/d MDPE pipe in a compression fitting
designed for 22mm o/d copper pipe and will need to use the 20-22mm olive
previously referred to by Andrew.
Let's hope that clears things up.
<5ec661f8-993b-4982...@l18g2000vbv.googlegroups.com>,
harry <harry...@btinternet.com> writes
>On Nov 7, 11:30�am, fred <n...@for.mail> wrote:
>>
>> The main issue was your contradictory and confusing statements, "22mm is
>> the nominal bore size" and "All 22mm pipe are the same OD", clearly
>> those 2 statements are mutually exclusive.
>
>>
>> The main issue was your contradictory and confusing statements, "22mm is
>> the nominal bore size" and "All 22mm pipe are the same OD", clearly
>> those 2 statements are mutually exclusive.
>
>Why is that? Don't you understand the difference between bore and OD?
>
I'm afraid I misread your post, it wasn't contradictory, it was simply
>
wrong:
22mm is not the "nominal bore size" of the pipe as you stated, it is the
outside diameter.
The o/p will be using 20mm o/d MDPE pipe in a compression fitting
designed for 22mm o/d copper pipe and will need to use the 20-22mm olive
previously referred to by Andrew.
Let's hope that clears things up.
harry
Nov 8, 2012, 2:10:58 AM11/8/12
to
On Nov 7, 4:04 pm, fred <n...@for.mail> wrote:
> In article
> <5ec661f8-993b-4982-b56d-9015a108a...@l18g2000vbv.googlegroups.com>,
> In article
> harry <harry130...@btinternet.com> writes>On Nov 7, 11:30 am, fred <n...@for.mail> wrote:
>
> >> The main issue was your contradictory and confusing statements, "22mm is
> >> the nominal bore size" and "All 22mm pipe are the same OD", clearly
> >> those 2 statements are mutually exclusive.
>
> >Why is that? Don't you understand the difference between bore and OD?
>
> I'm afraid I misread your post, it wasn't contradictory, it was simply
> wrong:
>
> 22mm is not the "nominal bore size" of the pipe as you stated, it is the
> outside diameter.
>
> The o/p will be using 20mm o/d MDPE pipe in a compression fitting
> designed for 22mm o/d copper pipe and will need to use the 20-22mm olive
> previously referred to by Andrew.
>
> Let's hope that clears things up.
You really are a f***g half wit rambling on about topics you have zero
>
> >> The main issue was your contradictory and confusing statements, "22mm is
> >> the nominal bore size" and "All 22mm pipe are the same OD", clearly
> >> those 2 statements are mutually exclusive.
>
> >Why is that? Don't you understand the difference between bore and OD?
>
> I'm afraid I misread your post, it wasn't contradictory, it was simply
> wrong:
>
> 22mm is not the "nominal bore size" of the pipe as you stated, it is the
> outside diameter.
>
> The o/p will be using 20mm o/d MDPE pipe in a compression fitting
> designed for 22mm o/d copper pipe and will need to use the 20-22mm olive
> previously referred to by Andrew.
>
> Let's hope that clears things up.
knowledge about.
http://en.wikipedia.org/wiki/Pipe_(fluid_conveyance)#Sizes
He will be using 15mm pipe. The 22mm fitting will be neccesary because
the MDPEpipe has a very thick wall diameter.
fred
Nov 8, 2012, 7:01:52 AM11/8/12
to
In article <42a9351b-c5ed-4f55...@googlegroups.com>,
letsh...@gmail.com writes
Apologies for various bits of misinformation and confusion in this
thread, I think both myself and Andrew failed to notice that you said
20mm _I/D_ as the size for your pipe rather than _O/D_ (outside
diameter) which is the dimension that current domestic MDPE pipe is sold
and specified in.
If your pipe really is MDPE (is it blue?[1]) and has an I/D of 20mm then
it is actually 25mm MDPE pipe. This will not fit a 22mm compression
fitting as it is sized for the outside diameter of the pipe it is to
mate with ie either 22mm (_O/D_) copper or internal plastic plumbing
pipe, and sadly 25 into 22 will not go.
The conversion olive that Andrew pointed to was for adapting 20mm MDPE
pipe (_O/D_) to a 22mm brass compression fitting so that will not work
on the 25mm MDPE pipe that you have.
I note that the same outfit also sell a conversion olive for 25mm MDPE:
http://www.stevensonplumbing.co.uk/25mm-mdpe-olive.html
which I imagine will be for the next available size of compression
fitting which is 28mm (for 28mm o/d copper).
This means you need a 28mm compression fitting. If you then want to mate
22mm copper to this then you will need a 22mm 'reducing set':
http://www.stevensonplumbing.co.uk/compression-reducing-set-28-22.html
or for 15mm copper a 15mm reducing set:
http://www.stevensonplumbing.co.uk/compression-reducing-set-28-15.html
Finally and at last, I hope that helps (although I'm guessing you've
already been to a plumbers' merchant and got the bits you need), good
luck on your job.
[1] blue specified for underground service but also avail in black.
letsh...@gmail.com writes
thread, I think both myself and Andrew failed to notice that you said
20mm _I/D_ as the size for your pipe rather than _O/D_ (outside
diameter) which is the dimension that current domestic MDPE pipe is sold
and specified in.
If your pipe really is MDPE (is it blue?[1]) and has an I/D of 20mm then
it is actually 25mm MDPE pipe. This will not fit a 22mm compression
fitting as it is sized for the outside diameter of the pipe it is to
mate with ie either 22mm (_O/D_) copper or internal plastic plumbing
pipe, and sadly 25 into 22 will not go.
The conversion olive that Andrew pointed to was for adapting 20mm MDPE
pipe (_O/D_) to a 22mm brass compression fitting so that will not work
on the 25mm MDPE pipe that you have.
I note that the same outfit also sell a conversion olive for 25mm MDPE:
http://www.stevensonplumbing.co.uk/25mm-mdpe-olive.html
which I imagine will be for the next available size of compression
fitting which is 28mm (for 28mm o/d copper).
This means you need a 28mm compression fitting. If you then want to mate
22mm copper to this then you will need a 22mm 'reducing set':
http://www.stevensonplumbing.co.uk/compression-reducing-set-28-22.html
or for 15mm copper a 15mm reducing set:
http://www.stevensonplumbing.co.uk/compression-reducing-set-28-15.html
Finally and at last, I hope that helps (although I'm guessing you've
already been to a plumbers' merchant and got the bits you need), good
luck on your job.
[1] blue specified for underground service but also avail in black.
fred
Nov 8, 2012, 7:28:15 AM11/8/12
to
In article
<5110b657-2932-4a25...@m4g2000yqf.googlegroups.com>,
harry <harry...@btinternet.com> writes
He appears to actually have 25mm MDPE which (in answer to his question)
will not fit a 22mm compression fitting but I have offered an
alternative solution.
And finally, just to clarify, can you perhaps explain what you meant by
"22mm is the nominal bore size." in your original reply, it doesn't
appear to relate to either 22mm domestic copper or 25mm domestic MDPE
metric pipe sizes. Just a sentence will do, own words preferred, no need
for links thanks.
<5110b657-2932-4a25...@m4g2000yqf.googlegroups.com>,
harry <harry...@btinternet.com> writes
>
>You really are a f***g half wit rambling on about topics you have zero
>knowledge about.
>http://en.wikipedia.org/wiki/Pipe_(fluid_conveyance)#Sizes
>
>He will be using 15mm pipe. The 22mm fitting will be neccesary because
>the MDPEpipe has a very thick wall diameter.
I think my latest reply, direct to the o/p will clarify.
>You really are a f***g half wit rambling on about topics you have zero
>knowledge about.
>http://en.wikipedia.org/wiki/Pipe_(fluid_conveyance)#Sizes
>
>He will be using 15mm pipe. The 22mm fitting will be neccesary because
>the MDPEpipe has a very thick wall diameter.
He appears to actually have 25mm MDPE which (in answer to his question)
will not fit a 22mm compression fitting but I have offered an
alternative solution.
And finally, just to clarify, can you perhaps explain what you meant by
"22mm is the nominal bore size." in your original reply, it doesn't
appear to relate to either 22mm domestic copper or 25mm domestic MDPE
metric pipe sizes. Just a sentence will do, own words preferred, no need
for links thanks.
harry
Nov 9, 2012, 1:54:01 AM11/9/12
to
On Nov 8, 12:28 pm, fred <n...@for.mail> wrote:
> In article
> <5110b657-2932-4a25-ab47-906f1c500...@m4g2000yqf.googlegroups.com>,
> In article
> harry <harry130...@btinternet.com> writes
The pipe commonly available for domestic applications is just a small
part of a much larger range. Read the link.
fred
Nov 9, 2012, 5:26:37 AM11/9/12
to
In article
<ae445e43-2dce-422b...@x21g2000vbg.googlegroups.com>,
harry <harry...@btinternet.com> writes
also have an o/d of 22mm as you seem to imply?
<ae445e43-2dce-422b...@x21g2000vbg.googlegroups.com>,
harry <harry...@btinternet.com> writes
>On Nov 8, 12:28 pm, fred <n...@for.mail> wrote:
>>
>> And finally, just to clarify, can you perhaps explain what you meant by
>> "22mm is the nominal bore size." in your original reply, it doesn't
>> appear to relate to either 22mm domestic copper or 25mm domestic MDPE
>> metric pipe sizes. Just a sentence will do, own words preferred, no need
>> for links thanks.
>
>>
>> And finally, just to clarify, can you perhaps explain what you meant by
>> "22mm is the nominal bore size." in your original reply, it doesn't
>> appear to relate to either 22mm domestic copper or 25mm domestic MDPE
>> metric pipe sizes. Just a sentence will do, own words preferred, no need
>> for links thanks.
>
>Of course not. That's what nominal means.
>The pipe commonly available for domestic applications is just a small
>part of a much larger range. Read the link.
The clarification I am looking for is how a pipe with a bore of 22mm can
>The pipe commonly available for domestic applications is just a small
>part of a much larger range. Read the link.
also have an o/d of 22mm as you seem to imply?
harry
Nov 9, 2012, 12:56:09 PM11/9/12
to
On Nov 9, 10:25 am, fred <n...@for.mail> wrote:
> In article
> <ae445e43-2dce-422b-ab42-900b1d964...@x21g2000vbg.googlegroups.com>,
> In article
> harry <harry130...@btinternet.com> writes
Didn't you read the link?
http://dictionary.reference.com/browse/nominal?s=b
fred
Nov 9, 2012, 1:31:01 PM11/9/12
to
In article
<61fae97f-ca72-4f17...@j19g2000vba.googlegroups.com>,
harry <harry...@btinternet.com> writes
Care to quote an authoritative reference that describes 22mm o/d copper
tube as having a 22mm nominal bore?
<61fae97f-ca72-4f17...@j19g2000vba.googlegroups.com>,
harry <harry...@btinternet.com> writes
>On Nov 9, 10:25 am, fred <n...@for.mail> wrote:
>> In article
>> <ae445e43-2dce-422b-ab42-900b1d964...@x21g2000vbg.googlegroups.com>,
>> harry <harry130...@btinternet.com> writes
>>
>> >On Nov 8, 12:28 pm, fred <n...@for.mail> wrote:
>>
>> >> And finally, just to clarify, can you perhaps explain what you meant by
>> >> "22mm is the nominal bore size." in your original reply, it doesn't
>> >> appear to relate to either 22mm domestic copper or 25mm domestic MDPE
>> >> metric pipe sizes. Just a sentence will do, own words preferred, no need
>> >> for links thanks.
>>
>> >Of course not. That's what nominal means.
>> >The pipe commonly available for domestic applications is just a small
>> >part of a much larger range. Read the link.
>>
>> The clarification I am looking for is how a pipe with a bore of 22mm can
>> also have an o/d of 22mm as you seem to imply?
>
>> In article
>> <ae445e43-2dce-422b-ab42-900b1d964...@x21g2000vbg.googlegroups.com>,
>> harry <harry130...@btinternet.com> writes
>>
>> >On Nov 8, 12:28 pm, fred <n...@for.mail> wrote:
>>
>> >> And finally, just to clarify, can you perhaps explain what you meant by
>> >> "22mm is the nominal bore size." in your original reply, it doesn't
>> >> appear to relate to either 22mm domestic copper or 25mm domestic MDPE
>> >> metric pipe sizes. Just a sentence will do, own words preferred, no need
>> >> for links thanks.
>>
>> >Of course not. That's what nominal means.
>> >The pipe commonly available for domestic applications is just a small
>> >part of a much larger range. Read the link.
>>
>> The clarification I am looking for is how a pipe with a bore of 22mm can
>> also have an o/d of 22mm as you seem to imply?
>
>Bores are nominal. ODs are exact.
>Didn't you read the link?
>http://dictionary.reference.com/browse/nominal?s=b
My god you are so full of shit.
>Didn't you read the link?
>http://dictionary.reference.com/browse/nominal?s=b
Care to quote an authoritative reference that describes 22mm o/d copper
tube as having a 22mm nominal bore?
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