Situation:
A. Have a 1500# carbon steel actuated ball valve with butt weld ends in B31.3 piping. A pressure class break occurs after that to 300#.
Question:
B. Should one side of the butt weld end valve be specified for the required wall schedule at 1500# and the other end for 300#?Or should...
Does anyone know if Chromium Carbide Coating has a lower temperature limits. I know it works well at and even 450 deg C, but it will per just as well at -50 deg C, assuming other conditions remains the same? Its for a ball valve application i.e. seat insert and ball coating. Treat it as a...
Thanks for the input. The acceleration forces are, as you may already be aware, are derived from the transport motions. As such regardless of the method used to secure or the type of the shipping saddles, these loads n doubt exist and needs to be accounted for. Further additional loads 'may' be...
Of course BigInch, just wanted to understand the industries' position on this before approaching Client, so that we have some 'valuable' input into his decision making. I think we all should, instead of just sliding the responsibility onto someone else.
So far, it seems like there is a general...
Thanks all.
Kiwi2671: The referenced project engineering standards (not ASME Codes) requires welds not be painted prior to testing however. This is where the snag is.
Pennpiper: Vendor was asking for a one time concession for one preassembled spool section, not for the entire plant.
Can piping be painted before hydrotest? ASME B31.3 does not address this but as a good engineering/fabrication measure the oil and gas/petrochemical industries require that the hydrotest take place prior to painting.
I have a contractor who has accidentally painted his spools, assembled all of...
TJ I agree with your final recommendation. In fact I've done that before and found that manufacturers do advise the use of fixed heads if found suitable after considering its service, mechanical stresses, maintenance requirements etc.
But still, I get a lot of defensive arguments from the...
muld0020: For the purpose of discussion, assume that the stresses can be contained by the fixed tubesheet design i.e. say BEM type.
TJOrlowski: Assume that cyclic service is not a factor. More often that not, at least in the offshore oil and gas industry, if the service fluid temperature...
For a high temperature/pressure application, if BEM design is found to be acceptable (within stress limits), would there be any incentive in using a AES design if BEM could do the job?
What I've 'heard' is that AES could be prone to internal leakage (thru its internal floating head), not to...
For which sizes and conditions are the above fittings necessary? I have given some examples here and if it is otherwise, let me know:
1. All trunnion mounted valves i.e. maybe 4" to 6" and larger for ANSI classes
2. Expensive valves in extreme high pressure and critical isolatio service i.e...
Ok, thanks.
Any examples, projects, valve or elastomer brochures that claims this? If I could find something that will allow me to verify or support the application, that will be great.
Are there any restrictions on pipe/schedule sizes below which specimen and satisfactory impact testing cound not be performed? ASTM A370 does not provide any guidelines on this.
The smallest specimen per A370 is 2.5mm x 10mm x 50mm.
Any input will be appreciated.
One valve vendor is proposing to use PEEK as the soft seat insert for 15000 psi valves. These are instrumnent double block and bleed valves (DBB), typically DN50 and 80.
If anyone here has experience using soft seats for 15k psi valves, please share.
Service: hydrocarbon NACE.
