Taboos and measures in forged steel valves pipeline construction-part two
Mar 18, 2019
Taboo 5: A common forged steel valve flange plate is used for a butterfly valve flange.
Consequences: Butterfly valve flange plates and ordinary forged steel valve flange plates vary in size. Some common forged steel valve flanges have a small inner diameter, while the butterfly valve has a large valve flap, which causes the forged steel valve to be damaged due to inability to open or hard open.
Measures: The flange plate must be machined according to the actual size of the butterfly valve flange.
Taboo 6: There are no reserved holes and embedded parts in the construction of the building structure, or the reserved holes are small in size and the embedded parts are not marked.
Consequences: During the construction of the heating and sanitation project, the building structure is excavated and even the load bearing steel bars are cut off, affecting the safety performance of the building.
Measures: Conscientiously familiar with the construction drawings of the heating and sanitation project. According to the needs of the installation of pipelines and hangers, actively and conscientiously cooperate with the reserved holes and embedded parts for the construction of the building structure, with specific reference to the design requirements and construction specifications.
Taboo 7: When the pipe is welded, the mouths of the pipe after the alignment is not on a center line, no gap is left between the mouths, and the beveled edges of the thick walled pipe are not shoveled. The width and height of the weld do not meet the construction specifications.
Consequences: The misalignment of the pipe directly affects the welding quality and the appearance quality. If there is no gap between the mouths, and the beveled edges of the thick-walled pipe are not shoveled or the width and height of the weld do not meet the requirements, the welding cannot meet the strength requirement.
Measures: After the pipeline alignment, the pipe cannot be staggered. It should be on a center line, the gap should be reserved for the mouth, and the beveled edges should be shoveled for thick walled pipe. The width and height of the weld should be welded according to the specifications.
Taboo 8: The pipe is directly buried in the frozen soil and the untreated loose soil. The spacing and position of the pipe buttress are improper, even in the form of dry brick.
Consequences: Due to the unstable support of the pipeline, the pipeline was damaged during the back fill tamping process, resulting in rework and repair.
Measures: Pipes should not be buried in frozen soil and untreated loose soil. The distance between the piers should meet the requirements of construction specifications, and the support pads should be firm, especially at the pipe joints, and should not be subjected to shearing forces. Brick piers should be built with cement mortar to ensure completeness and firmness.
Taboo 9: The expansion bolts of the pipe fixing supports are inferior in material. The hole diameter for the expansion bolts installation is too large or the expansion bolts are installed on brick walls or even light weight walls.
Consequences: The pipe support is loose and the pipe is deformed or even falls off.
Measures: The expansion bolts must be selected as qualified products. If necessary, sampling inspection should be made. The hole diameter for the installation of expansion bolts should not be larger than the outer diameter of the expansion bolts by 2 mm. The expansion bolts are applied to the concrete structure.
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