To make this clearly, here is a session between supplier and designer:
Supplier Say:
Schedule of flanges: the designer is insisting on having same schedule of flanges as for the nozzles necks due to mechanical and corrosion requirements.
This statement is not accurate. The higher thickness at...
Am asking for the common practice regarding the flange schedule that attached to the nozzle in the pressure vessels, the designer insists that the flange should have the same schedule of the nozzle neck as per his common practice, but the supplier says it is not necessary to be same as his...
According to trim 8 API 600 is this is acceptable? (see the attachment)
https://files.engineering.com/getfile.aspx?folder=86694eb8-b31a-44d4-9d0b-f03b4f204932&file=Gate_Valve_-_class_150.pdf
I am asking for wedge material in the gate valves as stated in the API 600 trim 8 the wedge material shall be 13%Cr the manufacturer has deviated to ASTM A216 WCB +13%Cr, Is this acceptable and compatible with the seat material (ASTM A105+ Stellite)?