Hello back,
Your new valves are for sure allready pressure tested by the valve manufacturer.
If the valves are flanged, there is for sure no problem. You may carry out a leak test (sensitive leak test at reduced pressure).
However, if they are welded in, you will have new welds that have not...
@Stanweld + MJCronin. Yes, I have experienced same thing with weld neck flanges (many years ago, 2500# WN flanges from Italy. We also had to change about 250 flanges from that lot.
The problem was very bad material - but very good certificates (falisfied). The weldability of the material was...
@Stanweld. Qoote from B31.3 (2008), sec. 345.2.3(b): Flanged loinfs. Flanged joints used to connect piping components and subassemblies that have previously been tested, and flanged joints at which a blank or blind is used to isolate equipment or other piping during a test, need not be leak...
@Isone: Thanks for the opinion. The pipe spools are hydrostatically tested to 1.5 times design pressure. However except the blind flanges which will be part of the final installation offshore. After that final assembly no hydrotest is done - just a sensitive leak test using nitrogen-helium as...
@Stanweld: Our problem is mainly that the test blinds used during the onshore workshop pressure test of separate piping spools are not those we are using for the final installation in the piping system offshore. The blinds being installed during final hook-up are new flanges directly from stock...
Hello Isone,
It is a very generic question what I initiated. Basically we talk about all sizes from 1" to 20" and with pressure rating 150# up to 2500#.
Material wise we talk about LTCS (A333, A350LF2, 316L, 22% Cr duplex - and in some few cases 25% Cr super duplex).
The spools are typically...
Thanks for the valuable input, rneill. I will however still be happy for receiving any further input. Thanks in advance. For example also if someone has experienced B16.5 blind flanges that actually failed during pressure test (fracture, rupture, etc.).
Best regards Kristian
When we are manufacturing prefab pipe spools for modification projects (offshore oil/gas), these spools are normally pressure tested onshore in the workshop. Often all flanged connections are blinded off using temporary test flanges. And at least one or several of the blinds used during the test...
Temperature measurements (PT 100 elements and bimetallic thermometers) in process piping often takes place in thermowells. However, both NORSOK and Shell DEP's are open for using surface measurement ("skin" measurement), and from time to time I have seen the surface measurement method being...
Can somebody give me some usefull guidelines for when to select a single stage OH1 pump rather than an OH2 pump?
When I look into API 610 standard it seems to be decided by for example the temperature conditions - and by the fact that the OH1 type pump does not fully comply with API 610.
Some...
