Dear experts,
I am working on a spherical pressure vessel constructed to ASME VIII Div. 2.
Min. Design metal temp. is -45°C.
There are several nozzles at the top of the vessel. One of them is a nozzle for a level transmitter with a stilling well that goes into the vessel.
My question is: do the...
Good afternoon.
Reference: ASME Section IX and API 650
Welding Process: SMAW
My client required the PQR to be qualified with a minimum of 3 PWHT cycles.
The material to be welded is 25 mm thick and the PWHT holding is 1 hour.
So I PWHT the PQR coupon for 6 hours in one heat. That is, heating...
Dear experts,
Is it a API 650 requirement that the second side of a double-side welded joint needs to be back-chipped at least one-third of the joint thickness?
I cannot find this requirement in the API 650 12th edition. Need advice.
Thanks
Dear experts,
API 650 storage tanks
My welding process is FCAW-G.
On the shell vertical seams, I am considering a single-vee joint, single side welding with ceramic backing.
Another option is single-vee, double side welding, which means I need to backgouge the second side.
I need advice on...
Dear experts, I need some help with QW 403.9 requirement.
I have attached a sketch of my PQR joint detail and production joint detail.
My PQR is qualified on 27mm thickness plate welded with a single pass EGW.
The production weld is a double vee joint to be welded with a single pass EGW on side...
Dear experts,
I am working on a storage tank and the project spec. calls for minimum 2 passes welding on the bottom lap joints.
Bottom plates is 8mm thick.
I am considering using SAW with auto downflat tractor but not sure if it is problem trying put 2 passes in a 8mm lap joint.
Please advise...
In Table 4.4a, A36M is grouped under I and II.
Note 3 for Group I A36M says "Thickness ≤ 20 mm."
Note 5 for Group II A36M says "...... Thicknesses ≤ 20 mm shall have a manganese content of 0.80 % to 1.20 % by heat analysis.
My question is; does the requirement in note 5 applies to note 3 if my...
I found a weld defect on P-No. 1 material after it has been PWHT'ed.
I intend to repair the weld followed by another cycle PWHT. NDE will be same as original weld.
Question: Does the requirement of section PW-40.3, PW-40.3.1-9 applies if I were to PWHT the repaired weld?
My understanding of...
Hi,
I fabricated 800H pipe welded with Inco 82 filler, performed stabilising annealing at 985 deg C for 3 hours.
Specified code is B31.3 and the service temperature is 850 deg C.
Client specifies a maximum cooling rate of 150 deg C/hr but we exceed this cooling rate. Actual cooling rate is 180...
I am looking for a clear definition of "Heavy Wall".
Can I say that if the wall thickness is greater than schedule STD for that size, will be considered heavy-wall.
Is there a formula which takes diameter and wall thickness into account to determined if a pipe is considered heavy wall.
Thanks.
After welding 347H pipe, we performed stabilizing annealing at 900°C for 4 hours followed by rapid cool with forced air.
Our client wants us to perform a hardness test but I do not think it is necessary because the stabilizing annealing is performed to improved the corrosion resistance and not...
