PE pipeline design

Question

PE pipeline design

Weldinspect (Mechanical)

(OP)

13 Jul 17 01:32

Ok I can ask now for a water PE pipeline design on a self owned property, what suystem is more practical, under ground or above? this would be a double system with 10 and 8 inches through 600 mtrs

http://albanesmolina.wix.com/home

LittleInch (Petroleum) · Answer 1 · 2017-07-13 08:02:33

Well, assuming this is the same project as you last post, water at 80C will reduce the long term strength of PE to virtually nothing. So what is your duty??

PE is a great material but has different properties to steel. One is long term creep under constant load. Hence it is a poor material to use between supports as it sags over time and needs constant support (i.e. a beam or similar) to prevent.

Also it has a thermal expansion co-efficient about 10 times that of steel.

So burial is a much better option, but at 80C, PE is not a good idea, IMHO though you might find some special PE which is rated at up to 80C.

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

Weldinspect (Mechanical) · Answer 2 · 2017-07-13 14:50:08

I am reading the pipe manual and it is PEX with DIN Standards 16892/16893 and Israeli standard 1519 and it can stand with water up to 110 C degrees.

Yes it´s the same project.

My duty is to assist the civil engineers team to design the pipeline. And we will also ask for help from the manufacturer.

That´s what I thought, burial, thanks a lot

http://albanesmolina.wix.com/home

LittleInch (Petroleum) · Answer 3 · 2017-07-13 16:04:38

Aaah - I have that stuff in my central heating system...

It only goes to about 200 / 250mm diam?

At 80 C though it's still fairly low rated pressure.

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

mk3223 (Mechanical) · Answer 4 · 2017-07-13 21:53:50

I used HDPE pipe in the water service, and the pipe size can go to 40+inch depending on the DR ratio.

Be aware of the pipe ID changes if required for a lower DR pipe to accommodate the pressure rating.

LittleInch (Petroleum) · Answer 5 · 2017-07-14 05:23:17

Normal PE yes, but this is PEX the OP is talking about.

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

mk3223 (Mechanical) · Answer 6 · 2017-07-14 15:55:51

RE: PE pipeline design

mk3223 (Mechanical) 14 Jul 17 15:55

LI, Thanks for the correction.

Weldinspect (Mechanical) · Answer 7 · 2017-07-15 15:44:23

This would be Pexgol from Israel and it can go up to 710 mm OD, looks very promising

http://albanesmolina.wix.com/home

LittleInch (Petroleum) · Answer 8 · 2017-07-15 17:24:07

Interesting stuff. I do wonder what the actual cost is compared to steel pipe though. Expansion is more than 10 times steel which needs to be considered at the ends of the pipeline if not the locked in section.

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

KevinNZ (Mechanical) · Answer 9 · 2017-07-17 04:07:15

I have seen a DN300 PE pipeline for 100C water just laying on the ground.

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