[MW:30034] Re: Annular plate

API Calls the below:

6.1.2.9 When bottom annular plates are required by 3.5.1, or by M.4.1, the radial joints shall be radiographed as

follows: (a) For double-welded butt joints, one spot radiograph shall be taken on 10% of the radial joints; (b) For single-welded butt joints with permanent or removable backup bar, one spot radiograph shall be taken on 50% of the radial joints. Extra carc must bc cxcrciscd in thc intcrprctation of radiographs of single-welded joints that have a permanent backup bar. In some cases, additional exposures taken at an angle may determine whether questionable indications are acceptable. The minimum radiographic length of each radial joint shall be 150 mm (6 in.). Locations of radiographs shall preferably be at the outer edge of the joint where the shell-plate and annular plate join. 

 - 3.5.1 clarifies the group classification

-  M4.1 Clarifies the tank dia.

Hope the above clarifies.

On Monday, September 9, 2019 at 7:54:46 AM UTC+4, basem elabd wrote:

Dear all

Are the but welding joint in annular plate of tank must be RT or not as per API 650?

Thanks

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