If the thinner Shell Plate thickness is >10 mm but ≤25 mm spot RT is required.
Pls look clauses 8.1.2.2, 8.1.2.3, and 8.1.2.4.
the relevant picture ( copy and paste from API 650)
I have went through this RT Requirements but i am not sure if my interpretation is correct that we need to take RT on all T joints above 10mm (4th point in the notes below the figure)
I was working on a project similar to this.
they were required to shoot some distance (let's say 8") either side.
This was back in the days of film and they ran out of 8" so they took a bunch on 12" film.
And low and behold nearly every x-ray had a defect in the extra distance.
The welders knew exactly how far they had to be careful.
They ended up with 100% x-ray and a lot of grind and reweld work.
I have went through this RT Requirements but i am not sure if my interpretation is correct that we need to take RT on all T joints above 10mm (4th point in the notes below the figure)
My interpretation is,
If the shell thickness greater than 10mm , you need to take RT on all T joints.( 4 is applicable ) moreover , horizontal spot RT ( item 2 ) is also applicable.
You may post the course thicknesses and plate sizes beginning from tank bottom to get better responds.
I was working on a project similar to this.
they were required to shoot some distance (let's say 8") either side.
This was back in the days of film and they ran out of 8" so they took a bunch on 12" film.
And low and behold nearly every x-ray had a defect in the extra distance.
The welders knew exactly how far they had to be careful.
They ended up with 100% x-ray and a lot of grind and reweld work.
Standard Designation:
BPV Section VIII Div 1
Edition/Addenda:
Para./Fig./Table No:
Subject Description:
Section VIII, Division 1 (1995 Edition, 1997 Addenda); UW-52(c)
Date Issued:
01/26/1999
Record Number:
BC98-290
Interpretation Number :
VIII-1-98-53
Question(s) and Reply(ies):
Question (1): Section V under T-275 speaks of an "area of interest." Can this be the same as the minimum length requirement of 6 in. given in UW-52(c) of Section VIII, Division 1?
Reply (1): Yes.
Question (2): Spot radiography is performed in accordance with Code rules and meets the acceptance criteria of UW-52(c) and UW-52(d)(1). If unacceptable indications are found outside the 6 in. minimum length requirement, is it required to perform two additional spot examinations as specified under UW-52(d)(2)?
Reply (2): No.
Question (3): May areas where unacceptable indications are found outside the 6 in. minimum length requirement be repaired at the Manufacturer's discretion?
