We presently have a 316L matl 3/8" wall thk. cyclone separator (F&D
head & cone bottom) that the Client has speced out to API 620 Code.
The operating temp is 215 deg F and design temp is 300 deg F, op
pressure is 3 psig to 5 in. wc vacuum and design pressure is 7.5 psig
to 15 in. wc vacuum.
Test reqs are 10 psig hydro and spot RT w/ 85% jnt efficiency.
API 620 states in 5.26 Radiographic/Ultrasonic Examination
5.26.4.3 (a) When parts of tanks do not require complete
examination, circumferential joints in cylindrical or conical surfaces
need to be prepared and examined for a distance of only 3 in. on each
side of any intersection with a longitudinal joint. All joints in a
spherical, torispherical, or ellipsoidal shape or in any other surface
or double curvature shall be considered longitudinal joints.
Does this mean that ALL "T" type joints (circ.-to-long seams) require
RT?
Appreciate your interpretation and comments,
Robert
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