Can share on experience with using Pilot SV for liquid service (boiler feed water, operating at 200 barg and 160 degC). Set pressure is 250 barg. During start-up, sometimes there are pressure spikes above 95% set pressure, due to operational issue.
I'd like to hear similar stories (successful...
Hi.
Scenario: A pressure vessel has four WPS/PQR. Three have PWHT, the 4th WPS/PQR does not have PWHT. All are valid WPS/PQR. After completion of welding, the whole pressure vessel goes into a furnace for heat treatment.
Question: Is this an NCR? Does the 4th WPS have to be requalified in...
This original post (thread725-19716) refers.
Backing gas is an NEV in ASME IX for GTAW, so changing the backing gas from Argon to Nitrogren does not trigger the requalification of the PQR (but of course, welders cannot change WPS by themselves, WPS can be edited by Welding Engineer without...
Is a pinhole considered a "rounded indication"?
As per ASME VIII Division 1 Mandatory Appendix 8:
"Rounded indications: any relevant indication (it means if its major dimension is greater than 1/16 (1.5 mm) ) shall be considered rejected if it is greater than 3/16 in (5 mm)"
As per ASME VIII...
Has anyone done a tube leak detection on shell and tube heat exchangers? The procedure is like this:
1. Pressurized shell side with pneumatic up to 4 barg, depending on your comfort level in handling pneumatic test.
2. Cover one tubesheet with masking tape, ensuring every tube hole is covered...
There is an ongoing discussion in my workplace regarding
SA 516 Gr. 70N vs SA 516 Gr. 70NACT vs SA 516 Gr70 Q&T
Which one is a better heat treatment for SA 516 Gr. 70? The requirement calls for HIC-resistant steel, too.
The group specifications mentioned "minimum normalized" condition for SA...
Dear all.
It is now 2020 and ASME PCC-2 2018 has been published with this paragraph:
"307-4.3.2 Cold bending refers to bending below Tcrit. The pipe may be bent cold if permitted by the applicable construction code or post-construction code. Cold bending may require heating below the...
For some reason, NDT was not done or carried out less than stated in ITP for a given equipment/facility.
However, equipment/facility was successfully hydrotested, and operated for almost 2 years without any incident.
Considering that NDT was not fully completed or not compliant to Code...
Dear all.
We have an Incoloy 825 pipe, just received from the mill with internal surface cracks first detected by visual (plain eyes!) then confirmed with dye penetrant (PT).
Questions:
1. From ASTM B423 and then ASTM B829, it seems that these surface cracks would not be able to be detected by...
So a fabricator made a PQR based on these parameters:
T = 50 mm
GTAW t (root) = 8 mm
SMAW t (middle passes) = 21 mm
SAW t (subsequent passes plus cap) = 21 mm
The PQR above is used to support a WPS with SMAW only and T and t ranges of 8 mm to 200 mm. (The WPS stated backing is required but this...
Is Code Case 19-15 in direct conflict with 341.3.1(a)?
Interpretation: 19-15
Subject: B31.3-1999 Edition (2001 Addenda), Para. 331.1.1, Heat Treatment Requirements and Para. 341.3.1, General
Date Issued: July 1, 2002
File: B31-02-03070
Question (2): In accordance with ASME B31.3-1999 Edition...
Dear all.
API 653 Section 9, and paragraphs 9.12.1 & 9.12.3 are hereby referred.
Case: We have a double deck EFR that is currently leaking. Tank is empty, and floating test of the roof showed more than half of the pontoon segments.
My question is, can non-metally repair of the leaking roof be...
Hi there everyone
I was taught and have been teaching others this understanding:
From QW-423 it is implied that a welder qualified to weld Carbon Steel is also qualified to weld Stainless Steel, as the P-Number is grouped in the first row in the table in QW-423.1
However, I was told by...
Dear all.
Does API 653 allow for build-up weld for shell-to-bottom plate all around the tank (internally or externally)?
Reading API 653 Section 9.10, there is no limitation on weld length but my colleague says 653 prohibit the build-up weld for all around the critical zone due to
"9.10.1.6...
Dear all.
I have a series of diffuser pipes connected together. These pipes are welded, with holes drilled on the pipes. Water enter the pipes and exits the holes. The pressure of inside and outside the pipe is in equilibrium, with the pipe being fully submerged in water. One portion of the...
Dear all
Is it possible to do MPI on weldment on a pipe that has already been galvanized? The galvanizing took place _after_ the welding. The galvanizing thickness is about 85 microns to 150 microns.
What is the maximum coating thickness (both galvanize and regular painting) that allows for...
Hi all.
Last week I came across a PQR which has both impact test and hardness test conducted in one PQR. I find that rather odd. Impact tests are for cold service, and thus you'd think that the weldment or material itself will need to be ductile (thus no point in taking hardness test). Hardness...
Hi there everyone.
I have a group of ageing assets (offshore platforms, mostly), which has scant documentations at best. Recently our organization embarked on a project to determine if the carbon steel portion of the pipings and pressure vessels are adequately protected against brittle...
I need to predict remaining life or time of failure for a plate that is subjected to a perpendicular liquid force (water) with a velocity of 6.13 m/s. The plate material is 13 Cr and thickness is 1.38".
How long does it take for the plate to thin out and perforate at the given 6.13 m/s liquid...
I am not sure where to post this.
But do you guys think TML stickers are worth the effort? I have problems reconciling various years of UT readings (latter years thickness seems incredibly thicker that older years).
API 570 speaks about "scanning".
Thanks in advance.
