Clean laboratory gas pipeline installation

Clean laboratory gas pipeline installation

Clean laboratory gas pipeline installation process: measurement and release → pipeline prefabrication, connection, pipe fitting installation → pipeline system pressure test → pipeline purging → pipeline interface anticorrosion; the test pressure of the valve shell shall not be less than 1.5 times the nominal pressure, The test time shall not be less than 5 minutes, with the shell...

Text label: clean pharma machinery installation, laboratory design, laboratory gas pipeline installation

Clean laboratory gas pipeline installation

Clean laboratory gas pipeline installation process: measurement and release → pipeline prefabrication, connection, pipe fitting installation → pipeline system pressure test → pipeline purging → pipeline interface anticorrosion; the test pressure of the valve shell shall not be less than 1.5 times the nominal pressure, The test time should not be less than 5 minutes, and it is qualified if the shell packing has no leakage; the shell pressure test of the valve should be tested according to the test pressure of the pipeline during the system test, and the gate sealing test can be tested by the color printing method. The color mark of the valve should be continuous; for the valves that pass the test, the internal water should be drained in time and dried. Except for the valves that need to be degreased, the sealing surface should be coated with anti-rust oil, and the valve should be closed; the safety valve should be in accordance with the design documents. The opening pressure should be tested and adjusted. The pressure should be stable during pressure regulation. The opening and closing tests of each safety valve should not be less than 3 times. The pipeline components and pipeline support and hangers should be properly stored during the construction process and should not be damaged. The orifice should be closed.

Flange or threaded connections should be used at the connections between valves and pipelines and at the places that are convenient for maintenance. Welded connections should be used for compressed air pipelines; arc welding should be used for pipeline welding connections, but when the DN is less than or equal to 80mm and the wall thickness is less than or equal to 4.0mm, Gas welding is allowed; the distance between the welding seam and the bending point of the elbow shall not be less than 100mm, and shall not be less than the outer diameter of the pipe, the net distance between the girth welding seam and the support and hanger shall not be less than 50mm, and no holes shall be opened on the pipeline welding seam and its edge. ; The pipe groove should be processed by mechanical methods or thermal processing methods. When the grooves are processed by thermal processing methods, the oxide scale, slag and surface layers that affect the quality of the joints should be removed from the groove surface, and the concave and convex surfaces should be removed. The uneven parts should be polished and welded in time; the inner wall of the butt welding joint of the pipeline should be flush with the inner wall, and the misalignment of the inner wall should not exceed 10% of the wall thickness. The process has been completed, and the degreased pipeline components must be strictly inspected before installation, and there must be no oil stains. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean laboratories and clean rooms.

The prefabricated installation of the clean laboratory pipeline should be constructed according to the pipeline system diagram in the process design document; the slope aspect and slope of the pipeline should meet the requirements of the design document and the use requirements of the oil-water separator. In order to achieve the required slope, the A metal backing plate shall be installed under the bottom of the support for adjustment, but the backing plate shall not be added between the pipeline and the support; the setting of flanges, welds and other connecting parts shall be convenient for maintenance, and shall not be close to the wall, floor and pipe frame; Walls and pipes passing through floors should be installed with casing, but the pipes should be welded in the casing; the flange connection should be coaxial, and the bolts should be fully penetrated, the flange bolt holes should be installed in the middle of the span, and the flanges should be kept between Parallel, the deviation shall not be greater than 1.5% of the outer diameter of the flange, and shall not be greater than 2mm. Do not use strong bolts to eliminate skew; when connecting pipes, do not use strong counterparts, offset pads or multi-layer pads to eliminate the interface. Defects such as gaps, deviations, misalignment or non-concentricity of the section; before installation of the valve, the packing should be checked, and the gland bolts should have an adjustment allowance, and the installation direction should be determined according to the cut-off flow direction, and installed in the closed state; pipeline installation The support and hanger should be fixed and adjusted in time, the position of the support and hanger should be accurate, the installation should be flat and firm, and the contact with the pipe should be close; the sliding surface of the guide bracket or sliding support should be clean and flat, and there should be no skew or jamming; After installation, after passing the non-destructive inspection, a pressure test should be carried out. The test pressure should be set to 1.5 times the design pressure and not lower than 0.4MPa; the test pressure should rise slowly. The test pressure is reduced to the design pressure, and the pressure is stopped for 30 minutes. If the pressure does not drop and there is no leakage, it is qualified. After the test is qualified, the blind plate is removed in time and the effusion is drained.

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