CSA G40.21 grade 260W plates API standard 650 tanks

Suggested Practice Regarding Installation of Low-pressure storage tanks
Access: All openings and accessories for tanks API standard 650 tanks constructed according to this standard shall be installed so that any periodic inspections required can be readily made.
Corrosion: When a tank bottom rests directly on the ground, a survey shall be made to establish the need for cathodic protection.
Drainage: All tanks in which water might accumulate under the hydrocarbon contents shall be provided with adequate drains that are suitably protected from freezing.

Test welds of each API 650 tank nozzle and manway reinforcing pad (or each section of multiple piece pad) using dry air and apply a soap solution test in the presence of Purchaser's Inspector before hydro testing the API standard 650 tanks tank. Tap one inch NPT test hole in each pad or section.

Welding inspection of bottom plate of API standard 650 tanks, vertical oil tank: During the fabrication and installation of API standard 650 tanks, the bottom edge plate is welded first. According to the requirements of the technical standard, penetrant inspection is required for the weld of edge plate at the bottom of API standard 650 tanks, that is, penetrant testing is required for each weld bead priming, filling and capping. In the process of testing, if any defect is found, it shall be repaired immediately. After the repair, the surface coloring penetrant test shall be conducted again until the test result is qualified.