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What Should be Paid Attention to When Installing Valves?

Dec. 21, 2020
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As a Wellhead Equipment Manufacturers, share with you.

Taboo 1: The pipeline is directly buried in frozen soil and untreated loose soil, and the spacing and location of the pipeline support piers are improper, even in the form of dry bricks. Consequences: The pipeline was damaged during the process of backfilling and tamping due to unstable support, causing rework and repair. Measures: The pipeline must not be buried in frozen soil and untreated loose soil. The spacing of the buttresses must conform to the requirements of the construction specification, and the support pads must be firm, especially the pipe joints, and should not bear shearing force. Brick buttresses should be built with cement mortar to ensure integrity and firmness.

Expanding Gate Valves

Expanding Gate Valves

Taboo 2: The material of the expansion bolts for fixing the pipe bracket is poor, the hole diameter of the expansion bolts is too large, or the expansion bolts are installed on the brick wall or even the light wall. Consequences: The pipe support is loose, the pipe is deformed, or even falls off. Measures: Qualified products must be selected for expansion bolts. If necessary, samples should be tested and inspected. The diameter of the installation bolts should not be larger than the outer diameter of the expansion bolts by 2mm. The expansion bolts should be applied to the concrete structure.

Taboo 3: The flange and gasket of the pipe connection are not strong enough, and the connecting bolts are short or have small diameters. Heat pipes use rubber pads, cold water pipes use asbestos pads, and double-layer pads or inclined pads, flange pads projecting into the pipe. Consequences: The flange connection is not tight or even damaged, causing leakage. The flange gasket protruding into the pipe will increase the water flow resistance. Measures: Pipe flanges and gaskets must meet the requirements of pipeline design working pressure. The flange gaskets of heating and hot water supply pipes should be rubber asbestos gaskets; the flange gaskets of water supply and drainage pipes should be rubber gaskets. The gasket of the flange shall not protrude into the pipe, and its outer circle should reach the bolt hole of the flange. Bevel pads or several gaskets should not be placed in the middle of the flange. The bolt diameter of the connecting flange should be less than 2mm than the flange diameter. The length of the bolt rod and the nut should be 1/2 of the thickness of the nut.

Taboo 4: In the hydraulic strength test and tightness test of the piping system of the valve manufacturer, only the pressure value and water level change are observed, and the leakage check is not enough. Consequences: Leakage occurs after the piping system is running, affecting normal use. Measures: When the piping system is tested in accordance with the design requirements and construction specifications, in addition to recording the pressure value or water level change within the specified time, it is particularly necessary to carefully check whether there is any leakage problem.

Taboo 5: Conceal the sewage, rain, and condensate pipes without closing the water test. Consequences: It may cause water leakage and cause user losses. Measures: The closed-water test work should be checked and accepted in strict accordance with the specifications. Concealed sewage, rainwater, condensate pipes, etc. buried in the ground, suspended ceilings, pipe rooms, etc., must ensure that there is no leakage.

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