Get Free Api 620 12th Edition design pressure is 15 psig according to API 620 (12th Edition, 2013). Because these storage tanks have very thin shelled walls, a slight vacuum can cause tank distortion and failure. Upon a sudden change in weather conditions such as a rainstorm occurring suddenly, atmospheric storage tanks experience thermal. Benefits of API 620 are: It is used for products which have high internal pressure such as liquefied natural gas (LNG) and cryogenic tanks. It can store contents at a higher pressure (maximum 15 pounds per square inch (PSI) of gas or vapor storage) and lower temperature (-325 degrees F to 250 degrees F) than API 650. It can store any liquid. API Std 620 - Standard for Design and Construction of Large, Welded, Low-pressure Storage Tanks API Std 650 - Standard for Welded Steel Tanks for Oil Storage API RP 651 - Recommended Practice for Cathodic Protection of Aboveground Storage Tanks. May 27, 2016 API 620 regulates the design and manufacture of large steel low-pressure storage tanks, usually larger than 300 feet in diameter. By contrast, API Standard 650 is typically used for carbon, stainless steel and aluminium tanks located in terminals, refineries, pipelines and other process facilities.
API 620 - Do ALL 'T' Joints Require RT?
Api 620 Storage Tanks Standard
API 620 - Do ALL 'T' Joints Require RT?
Api 620 Tank Code
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
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