One, the implementation of standards:

National standard: GB 50128-2005 "vertical cylindrical steel welded construction and acceptance specification of tank"

Foreign standards: API-650-2007 "welded steel oil tank standard" - the United States standard

Two, construction specification:

1, the construction method: ordinary vertical tank construction with chain guide flip chip method: construction preparation, material inspection, blanking, machining and inspection, tank bottom plates welding, the bottom of the tank edge plate, the center column, arch frame erection, the top ring group welding, wrapping angle welding, temporary roof support assembly and guide chain lifting device, crown group welding, ring group welding, lifting the top ring wall, girth welding, seam welding, the ring, bottom ring plate angle seam welding, the bottom edge board, inspection and installation of accessories, vacuum test, system test and settlement observation, completion.

2, the prefabricated arc model: 3: check the curvature model a, the length of not less than 2 meters; inspection of weld corner deformation within the arc model a, the length of not less than 1 meters; check the outer arc weld deformation model a, the length of not less than 1 metres.

3, the tank assembly: according to the tank installation order, before the installation of base plate, the lower surface anti-corrosion. Laying floor before, should be based on acceptance, surface to draw freely cross the center line, when civil label centerline deviation is larger (but within the allowable range), this time should be adjusted to the minimum.

Test 4, welding and weld: according to JB4708-92 "steel pressure vessels welding technology assessment" to butt joint, welding procedure qualification of T shaped weld and pipe plate, welding process instruction field, tank weld NDT personnel, radiographic inspection according to GB3323-87 "steel melt welded butt joint X-ray and quality classification" the provisions of.

Three, detection method:

1, the test: bottom vacuum leak testing, all the seam leakage test using vacuum, vacuum degree should not be less than 53Kpa, with the method of penetrant test for re inspection.

2, the tank water filled test: floating disc lifting test, settlement observation based. And then the upper part of the hole will be temporarily closed, tank top light hole open, to the tank is filled with water, the water should be used water, the water temperature should not be lower than 5 degrees Celsius, 48 hours of power.

3, the tank wall of the tank top tightness test, strength test and stability test: in the tank filled with water, when the water level is higher than 1m, the tank top light hole, bubble outlet vent closed, continue to water to the tank, surface observation of pressure reading through the top of the tank is provided temporary pressure. Voltage test, carried out in the water filled test, when the water reached the highest level after operation, all closed, the water to the slow, negative pressure tank, closely monitor the pressure readings, when the negative pressure readings to 200mm when the water column, stops the water, then to the tank is filled with water, so that the restoration of normal pressure tank.

4, inspection: the contact angle and the reinforcing plate of fillet weld of penetrant or magnetic particle inspection.