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What Matters Should Be Paid Attention to When Installing the Valve?

Apr. 19, 2021

As a Wellhead Equipment Manufacturers, share with you.

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

Wellhead Gate Valve

Wellhead Gate Valve

Taboo 2: The material of the expansion bolts for fixing the pipeline 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 checked. The hole diameter of the expansion bolts should not be larger than the outer diameter of the expansion bolts by 2mm. The expansion bolts should be used on concrete structures.

Taboo 3: The flanges and gaskets 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 protruding 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. No bevel pads or several gaskets should be placed in the middle of the flange. The bolt diameter of the connecting flange should be less than 2mm than the flange hole 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 observe the pressure value and water level changes, and the leakage check is not enough. Consequences: Leakage occurs after the piping system is in operation, 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 a leakage problem.

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