Hi All,
Thanks for the replies.
I haven’t contacted anyone yet as the requirement only arose as I finished for the day.
The casing has a full thread depth of 1.5 x bolt dia.
The compressor has a lead time of 60 - 70 weeks so I didn’t want to risk damaging it.
It sounds like hydraulic...
Hi All,
My client has a specification requiring all bolts 1” and above to be hydraulically tensioned. I have a pipe flange connecting to a compressor with a tapped hole - would you normally apply hydraulic tensioning to a tapped hole? My concern would be that the thread gets damaged during the...
Hi Christine74,
No, there is no requirement to have it ‘L stamped’. The only reason I mentioned it was because the client was insisting PWHT was performed on the vessel (this was not agreed pre PO, nothing in datasheets or specifications). As such, I stated the code does not require PWHT...
Thanks for the replies. I’ve emailed the client to advise the end user needs to determine if it’s lethal service or not. As it stands, PWHT is not in our scope of supply. If they want PEHT, we will raise a VOR for it.
Thanks,
Graeme
Hi All,
We are supplying an ASME VIII Div 1 pressure vessel (wall thickness 15mm) containing process gas consisting of over 500ppm H2S. There is nothing in the clients specifications to state the vessel requires PWHT and they have not specified that the vessel is lethal service. After PO...
Thanks for the responses.
JStephen, you are correct that the contractual requirements would have to be followed , however I don't think it is stated for this equipment, only that they should be designed in accordance with ASME VIII Div 1, therefore I feel we could argue the point that just...
Hi,
We have to design a pulsation suppressor for a screw compressor on a Brazilian FPSO. Normally we design them in accordance with ASME B31.3 as they are attached to the pipework and have no potential for blockages therefore subject to the same pressure requirements as the pipe. However, on...
Hi Steve,
I agree, normally we work to piping classes supplied by the client and in this case, they did specify SS valves. The problem has arisen due to our sales team deviating from this and the client accepting (tbh, I think the client was in a rush to place the order and agreed to...
Yeah I agree, it's not really our issue but I am trying to help my client out, suppose it just my good nature! :)
The oil system is designed to API 614 5th edition, so I had another look through that. The specification doesn't really state the material of the valve bodies, only that the trim...
Hi Steve,
I think the main reason the client is concerned is that they specified SS valves in the spec but our sales team submitted a deviation for CS valves which was accepted by the client. If I have to guess, I'd say the end user is pushing our client to use SS valves but as we have a...
Hi edstainless,
The flanges upstream would be covered with insulating jackets, the flanges downstream would be unprotected.
Hi Steve,
The fasteners would be coated in xylan 1070 so I assumed this would be enough of a barrier against the corrosion.
With the valves, I should have mentioned...
Ok,
I’m not sure how they plan to maintain the system at site but they have specified unpainted stainless steel so may be the are planning to wash it down regularly.
With regards to galvanic corrosion, the oil is not an electrolyte but would the sea fog be considered one?
If the contact...
Hi Steve,
The stainless steel will be pickled and passivated. As I understand it, stainless steel in the passive state will have minimum corrosion. Is this correct?
Graeme
Hi steve,
Thanks for the link, I’ll have a look through it when I’m back in the office on Monday.
Hi edstainless,
The oil temp will be 100deg C upstream of the cooler and 50deg C downstream. The upstream pipework will have perforated plate as personnel protection.
The min ambient temp is...
Hi I posted this earlier in the wrong forum,
I am designing a lube oil pipe system to be installed in a refinery close to the coast. The oil system is fabricated from unpainted 316/316L stainless steel pipework and painted ASTM A105N carbon steel valves with stainless steel trim (Company...
