To describe a standard operating procedure for inspection and testing of under ground storage tanks / above ground storage tanks.
1.0 PURPOSE:
To describe a standard operating procedure for inspection and testing of under ground storage tanks / above ground storage tanks.
2.0 SCOPE:
The standard operating procedure describes in detail the method of inspection and testing of under ground storage tanks / above ground storage tanks.
3.0 RESPONSIBILITY:
The responsibility of inspection and testing of under ground storage tanks / above ground storage tanks lies with the staff of rank not lower than the Maintenance Engineer.
The responsibility of preparing, reviewing and approving the standard operating procedure lies with the Manager - Maintenance, Head of Production and Head of QAD respectively.
4.0 METHOD:
4.1 Inspection:
4.1.1 Ensure that the storage tank is empty and cleaned.
4.1.2 Dismantle the manhole flange cover and check the internal surfaces of the tank using Flame proof light for corrosion (Pitting of tank) by viewing through manhole. If the tank is corroded heavily, propose for replacement of the same.
4.1.3 Check the all flanges, nozzles and their pipe line connections for their intactness.
4.1.4 Record the details in Annexure.
4.2 Testing:
4.2.1 Thickness testing:
4.2.1.1 Ensure that the storage tank is empty and clean.
4.2.1.2 Using thickness tester, check the thickness of the tank from out side surface, and record the same in Annexure.
4.2.1.3 If the thickness of the tank reduced by 25% of the original thickness, propose for replacement of the same.
4.2.2 Pressure test:
4.2.2.1 Ensure that the storage tank is empty and clean.
4.2.2.2 Blank all the nozzles.
4.2.2.3 Fix the air hose with vent valve.
4.2.2.4 Apply 1.0 Kg/cm2 pressure and check for 15 minutes and ensure no pressure drop.
4.2.2.5 If the pressure drop observed, within 15 minutes take out the tank and rectify the problem, and relocate the same.
4.2.2.6 Record the details in the Annexure.
4.3 Frequency: once in a year ± 15 days or whenever the tank is empty (whichever is early).
5.0 RECORDING:
The responsibility of recording the details in the annexure lies with the staff of rank not lower than the Maintenance supervisor.
Storage tanks, under ground, engineering
