High-pressure pipeline installation with the same, low-pressure pipe installation requirements are similar, but require a higher, more stringent requirements, therefore, in addition to meet the requirements of medium and low pressure pipeline installation, should still follow the requirements of the implementation.
The high-pressure pipe fittings, fittings, fasteners and valves used to install must be inspected and accompanied by the corresponding technical documentation, which should be kept in good condition and marked and placed neatly. Before installation, should be inside and outside the surface wipe clean, and check the inside of the channel whether the foreign body, whether smooth. Check whether the roughness of the sealing surface of the nozzle and the gasket meets the requirements. No defects such as scratches (especially radial scratches) and spots on the sealing surface may be affected. In addition to the specified defatted pipe, The mouth seal and the gasket are coated with oil or butter or white petrolatum. Inspection of qualified high-pressure pipe end of the threaded part, in addition to the provisions of the degreasing of the pipeline, should be coated with molybdenum disulfide grease or graphite oil blending agent protection.
Pipeline installation, should use a formal pipe rack fixed, and high pressure pipe, pipe fittings on the pipe rack, according to the design requirements to install protective casing. Install the high-pressure flange should be exposed when the end of the thread chamfering. When installing the gasket, do not use wire hanging, should be in advance on the nozzle and pad coated with butter, soft metal high pressure gasket should be accurately into the seal seat. Flange bolts should be symmetrical evenly tightened, not excessive, bolts tightened, the two flanges should be kept in parallel concentric, exposed nuts outside the thread should be 2 to 3 buckle, at least not less than 2 buckle, and make the bolt Exposed length is basically the same. In the installation process, do not use strong pull, strong push, strong twist or modify the thickness of the gasket and other methods to make up for manufacturing or installation errors. If the pipe installation work can not be carried out continuously and completed, the open nozzle should be closed in time. Pipes on the instrument sampling parts of the parts should be installed with the pipeline at the same time.
Alloy steel pipe for local bending correction, the heating temperature must be controlled in the steel below the critical temperature.
After the installation of the pipeline system is completed, should be a comprehensive review of the steel mark on the pipeline, if found somewhere missed, should be based on the original basis to make up.
High pressure tube normalized outside diameter allowable deviation
D1
± 1.5%, minimum ± 0.75 mm
D2
± 1.0%. Minimum ± 0.50 mm
D3
± 0.75%. Minimum ± 0.30 mm
D4
± 0.50%. Minimum ± 0.10 mm
High pressure pipe weight formula:
[(Outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter)
The high-pressure pipe fittings, fittings, fasteners and valves used to install must be inspected and accompanied by the corresponding technical documentation, which should be kept in good condition and marked and placed neatly. Before installation, should be inside and outside the surface wipe clean, and check the inside of the channel whether the foreign body, whether smooth. Check whether the roughness of the sealing surface of the nozzle and the gasket meets the requirements. No defects such as scratches (especially radial scratches) and spots on the sealing surface may be affected. In addition to the specified defatted pipe, The mouth seal and the gasket are coated with oil or butter or white petrolatum. Inspection of qualified high-pressure pipe end of the threaded part, in addition to the provisions of the degreasing of the pipeline, should be coated with molybdenum disulfide grease or graphite oil blending agent protection.
Pipeline installation, should use a formal pipe rack fixed, and high pressure pipe, pipe fittings on the pipe rack, according to the design requirements to install protective casing. Install the high-pressure flange should be exposed when the end of the thread chamfering. When installing the gasket, do not use wire hanging, should be in advance on the nozzle and pad coated with butter, soft metal high pressure gasket should be accurately into the seal seat. Flange bolts should be symmetrical evenly tightened, not excessive, bolts tightened, the two flanges should be kept in parallel concentric, exposed nuts outside the thread should be 2 to 3 buckle, at least not less than 2 buckle, and make the bolt Exposed length is basically the same. In the installation process, do not use strong pull, strong push, strong twist or modify the thickness of the gasket and other methods to make up for manufacturing or installation errors. If the pipe installation work can not be carried out continuously and completed, the open nozzle should be closed in time. Pipes on the instrument sampling parts of the parts should be installed with the pipeline at the same time.
Alloy steel pipe for local bending correction, the heating temperature must be controlled in the steel below the critical temperature.
After the installation of the pipeline system is completed, should be a comprehensive review of the steel mark on the pipeline, if found somewhere missed, should be based on the original basis to make up.
High pressure tube normalized outside diameter allowable deviation
D1
± 1.5%, minimum ± 0.75 mm
D2
± 1.0%. Minimum ± 0.50 mm
D3
± 0.75%. Minimum ± 0.30 mm
D4
± 0.50%. Minimum ± 0.10 mm
High pressure pipe weight formula:
[(Outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter)
