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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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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? |
#2
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On Monday, November 5, 2012 6:57:37 PM UTC, wrote:
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? You'd need to replace the olives with these: http://www.stevensonplumbing.co.uk/2...ion-olive.html A |
#3
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On Nov 5, 6:57*pm, wrote:
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? 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. 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. |
#4
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In article
, harry 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. -- fred it's a ba-na-na . . . . |
#5
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On Nov 7, 10:14*am, fred wrote:
In article , harry 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. 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. |
#6
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In article
, harry writes On Nov 7, 10:14*am, fred wrote: In article , harry 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? 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. -- fred it's a ba-na-na . . . . |
#7
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On Nov 7, 11:30*am, fred wrote:
In article , harry writes On Nov 7, 10:14 am, fred wrote: In article , harry 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? 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. -- fred it's a ba-na-na . . . . Why is that? Don't you understand the difference between bore and OD? 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. |
#8
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In article
, harry writes On Nov 7, 11:30*am, fred 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. -- fred it's a ba-na-na . . . . |
#9
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On Nov 7, 4:04*pm, fred wrote:
In article , harry writesOn Nov 7, 11:30*am, fred 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 knowledge about. http://en.wikipedia.org/wiki/Pipe_(f...veyance)#Sizes He will be using 15mm pipe. The 22mm fitting will be neccesary because the MDPEpipe has a very thick wall diameter. |
#11
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In article
, harry writes You really are a f***g half wit rambling on about topics you have zero knowledge about. http://en.wikipedia.org/wiki/Pipe_(f...veyance)#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. 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. -- fred it's a ba-na-na . . . . |
#12
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On Nov 8, 12:28*pm, fred wrote:
In article , harry writes You really are a f***g half wit rambling on about topics you have zero knowledge about. http://en.wikipedia.org/wiki/Pipe_(f...veyance)#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. 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. -- fred it's a ba-na-na . . . . 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. |
#13
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In article
, harry writes On Nov 8, 12:28*pm, fred 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? -- fred it's a ba-na-na . . . . |
#14
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On Nov 9, 10:25*am, fred wrote:
In article , harry writes On Nov 8, 12:28 pm, fred 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? -- fred it's a ba-na-na . . . . Bores are nominal. ODs are exact. Didn't you read the link? http://dictionary.reference.com/browse/nominal?s=b |
#15
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In article
, harry writes On Nov 9, 10:25*am, fred wrote: In article , harry writes On Nov 8, 12:28 pm, fred 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 ****. Care to quote an authoritative reference that describes 22mm o/d copper tube as having a 22mm nominal bore? -- fred it's a ba-na-na . . . . |
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