Flanged HDPE to Stainless Pipe

[mae1133]

I have a low pressure/slight vacuum gas application in Australia where I require 750 mm sch 40 stainless pipe with am ID of 743 mm. A portion of the piping will be buried, so for the buried portion, I plan to transition to PE100/PN10 DR17 HDPE. Because I need to maintain an ID of at least the same as the SS ID, I have selected 900 mm HDPE with an ID of ~790 mm. So, to connect the two together, I will need to use a 900 x 750 SS reducer to bring the SS up to the approx. OD of the HDPE. On the HDPE, I will need a stub end and backing flange, but can someone tell me what to use for the mating flanges? I can't seem to find the proper flange for each that would properly mate to each other. Thanks

 

[nickelkid]

I had to transition to PVC in the past with a threaded flange (steel) and used a male npt x female socket coupling (pvc). Not sure if that would work with HDPE…

 

[LittleInch]

900mm flange to En 1092.

See this lot. Look under accessories for the backing rings. And pupped fittings for the stub flanges.

http://www.gpsuk.com/range/29/accesories.html

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[mae1133]

Can someone tell me what the dimensional flange standard is for each of the mating flanges based on Australian standards? I assume BS EN 1092 is not an Australian standard, but perhaps I'm wrong?

 

[LittleInch]

Try iso 4427 then

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[bimr]

You have not stated the length of the pipe, you should be aware of the Poisson pull out effect.

http://www.eng-tips.com/viewthread.cfm?qid=290415

 

[mae1133]

bimr:

I have accounted for this, but my question was only pertaining to connecting SS to HDPE.

LittleInch:

Thanks.