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Site Gas Supply Approach
Jun 30, 2017

Site Gas Supply Approach

LNG site gas supply common problems First, the leakage, liquid 1, flange connection leakage, liquid. Treatment: If the amount of leakage is not large, the direct use of tools on the leakage flange fastening bolts fastening. When tightening, press the diagonal for fastening, fastening can not be a tight dead, should be fastening. If still tight after the leak, then the leakage of the flange front valve closed, the leak at the pipeline after the pressure relief will be opened at the connection after the replacement of gasket and then fastened. If the leakage is too large or leakage, the leakage of the flange front valve closed, the leak at the pipeline after pressure relief according to the above method. If it still leaks after fastening, replace the gasket as described above. (The operator must wear antifreeze gloves before they can be processed) 2, low temperature valve leakage. Remedy: Use tools to fasten the bolts on the bonnet. If there is still a leak after fastening, contact the valve manufacturer to replace the valve inside the gasket and packing. Second, the tank, tanker pressure analysis: tank, tanker pressure is generally due to pressurized gasifier can not work properly. The main reasons are: pressurized liquid valve plug, pressurized gas valve blockage, supercharger control valve blockage. Reason to confirm the method: close the booster liquid valve, open the pressurized gas valve, open the supercharger control valve bypass valve, the pressurized gasifier after the appropriate vent the booster liquid valve a small amount of open. If the supercharged liquid with a liquid flow, it is pressurized gas valve plug. If the supercharged liquid phase does not flow through the liquid, the pressurized liquid phase valve is clogged. 3, pressurized liquid valve blockage. Treatment: Open the supercharger control valve bypass valve and pressurized gas valve, the booster liquid valve is fully closed and then closed, repeated several times until the gasifier can work properly. If the operation is still unable to work after a number of times, then the pressurized liquid valve to open the door to clear (demolition valve must be full-time technical staff). 4, pressurized gas valve blockage. Treatment: Open the supercharger control valve bypass valve. Close the pressurized gas phase valve and the booster liquid phase valve. After the proper venting of the pressurized gasifier, the supercharged liquid valve is opened in a small amount and the fully pressurized gas phase valve is fully opened. Repeat the above steps until the gasifier is working properly. If the operation is not possible after repeated operation, the pressurized gas valve will be opened for clearance (the valve must be carried out by the company's full-time technical staff). 5, supercharger control valve blockage. Confirm the pressurized liquid valve, pressurized gas valve is working properly after closing the supercharger control valve bypass valve, if the booster gasifier does not work, then the supercharger control valve blockage. Treatment method: the pressure regulator valve to clear the clearance (demolition valve must be full-time technical staff by the company).

Tank, tanker overpressure. 6, liquid full tank when the supercharging effect is too good to cause overpressure. Treatment: When the liquid full tank, the tank can ensure that the normal pressure to close the pressurized liquid valve. When the tank liquid to use a part, and then open the pressurized liquid valve to pressurize the tank. 7, supercharged control valve was frozen. When the booster valve is frozen and can not adjust the pressure, the tank pressure will continue to rise. Treatment: open the tank or tank gas phase outlet, the overpressure of the gas transported to the gas pipeline to achieve the purpose of antihypertensive. While closing the booster liquid valve. If there is hot water with hot water pouring pressure regulator valve, so that throttle control valve quickly thaw. And other pressurized gasifier surface without frost and the tank pressure can be opened when the pressurized liquid phase valve to continue to use pressurized gasifier.