[wnrf piper]

To be honest I never really gave it much thought, strangely never an issue for me.
Ill start by saying that I have not worked in the oil and gas sector, just pharmaceuticals and heavy industry. With regards to HAZ it must be industry or process specific because its never been an issue for any line I have worked on. When you have slip on flange there are 2 welds in close proximity, any fitting on seam welded pipe has over lapping welds on 45 deg elbows the welds can also be quite close, so I never really understood that one. I always worked on the principal as long as the welds dont touch your ok. Comes from a BS standard. So I dont think thats the reason. The only thing I can think of is that for the larger sizes on site to get a square cut you need to have some straight pipe either side of the cut to be able mount the jig for gas cutting the pipe.

[wnrf piper]

Depending on the slurry but we had to put plenty of drains in, generally put them in larger than you would for liquid service.
You do this because if the pump fails or something else halts the flow in the line, you need to be able to fully drain all the line rapidly before the solids settle out and block the line. Aslo plenty of flanges for 2 reasons if the latter happens and to aid in replacement of worn sections.I should add I wouldnt worry about socket welds, the materials you mentioned cross contamination wouldnt be an issue. unlikely that you will have fittings 2″ down on slurry lines anyway.

[wnrf piper]

I think your answer may lie in this topic…

https://pipingdesigners.com/wp//phpBB3/viewtopic.php?f=1&t=47

[wnrf piper]

I have no experience of off shore, but I do have experience of supporing off grating/decking.
Grating/decking will have a design load ie. XkN/Msq. So if your support load is 0.5X then your base plate will have to have an area of 0.5Msq to effectively spread the load accross the decking/grating so as to not comprimise the design load of the decking. HTH.

[wnrf piper]

Depending on line size, pipe run. Jacking bolts & plates may be requied to spread the flanges. Theseaa re usually lugs which have been welded to the flanges. So if you take Antons bolt numbering then the Lugs would be welded on at bolt No.1 & 5. One lug one be drilled and tapped to take a suitably sized bolt. A spanner is then used to tighten the bolt up against the lug on the opposite flange. There can be several variations of these, but the principal is the same.

[wnrf piper]

Why not draw one…?

[wnrf piper]

Dead legs! All over.
Take offs from the bottom.
Piping run over equipment.
Piping accross walkways/platforms.
To name a few…

[wnrf piper]

Everything in piping is done for a reason. Untill you know or understand those reasons do not make changes.

[wnrf piper]

Can you not do a pneumatic test

[wnrf piper]

Can you not do a pneumatic test

[wnrf piper]

Thats pretty much what I thought. The only major difference that i can see is that you might not be familiar with a typical layout of a fractional column or some other industry specific equipment. But that can be quickly over come.

[wnrf piper]

Thats pretty much what I thought. The only major difference that i can see is that you might not be familiar with a typical layout of a fractional column or some other industry specific equipment. But that can be quickly over come.

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