Api 620 Storage Tanks
Api 620 Code
API STANDARD 620 TENTH EDITION, FEBRUARY 2002 ADDENDUM 1, JUNE 2004. E Use Only SPECIAL NOTES. American Petroleum Institute, 1220 L Street, NW, Washington, D.C. API 650, Appendix V, provides the normal operating external pressure range as 0.25 kPa (0.036 lbf/in 2) to 6.9 kPa (1.0 lbf/in 2).I understand API 620 tanks stipulates the maximum partial vacuum to be at least 1 in.
API 620 - Do ALL 'T' Joints Require RT?
Api 620 Code
API 620 - Do ALL 'T' Joints Require RT?
Api 620 Standard
Dear Sirs,
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.
Client 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
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.
Client 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