API 650/RT interpretaiton

[Manoj John]

Dear Experts,

Can anybody help me by providing API 650 interpretation for radiography.

What I understood is only welderwise RT required for vertical joint for each welders/operators first 3 mtr vertical joints, all other RT requirements are irrespective of welder or welding operator.

I could not understand the interpretation of clause "8.1.2.6 An equal number of spot radiographs shall be taken from the work of each welder or welding operator in
proportion to the length of joints welded."

Thanks in advance.

Manoj

[ash...@gmail.com]

Hi John

From my understanding RT requirement as stated by you is correct and in addition spot RT with locations for Vertical shell joints, with respect to shell plate thickness mentioned in Figure 8.1

Clause "8.1.2.6 An equal number of spot radiographs shall be taken from the work of each welder or welding operator in proportion to the length of joints welded." - This can not be allways appicable for shell vertical joints, even though can be considered while selecting spot RT for the below case BOLDED

1. Vertical spot radiograph in accordance with 8.1.2.2, Item a: one in the first 3 m (10 ft) and one in each 30 m (100 ft) thereafter,

25 % of which shall be at intersections

Normally 8.1.2.6 can apply while RT selection for the annular joints

Thanks

Ashish S Pillai