(2) Installation of underground sewage pump: The model and specification of sewage pump must meet the design requirements. Suction bottom
The valve should be located in the middle of the sump, and the bottom valve is strictly prohibited from touching the pit wall. Should be accurate positioning, fixed firmly, pipe connection is tight, no noise, allowable deviation.
(3) Installation of sewage pump lifting drainage pipeline: the diameter of perforated elbow is welded by seamless pipe.
The pipe joints are the same, and the requirements for pipe joints are the same as above. PN 16 explosion-proof butterfly valve should be installed before the drain pipe leaves the house. The underground part should be coated with antirust paint and silver powder, and the buried part should be treated with two cloths and three oils, and the water test port should be watertight.
(4) Installation of heat exchangers for water tank pressure stabilizing pump and booster pump (life and fire fighting). Specifications, models and dimensions must meet the design requirements; Before the pump is in place, the strength, coordinates, elevation, size and bolt position of foundation concrete must meet the design requirements and construction specifications; Flexible rubber joints should be installed at the inlet and outlet of the pump; During the trial operation of the pump, the temperature rise of the bearing must conform to the construction specifications. The water tank irrigation test must meet the design requirements and construction specifications, and the size and position of the water tank base should meet the design requirements, and it should be buried flat and firm.
2, water supply pipeline (including fire pipeline) installation:
(1), concealed pipes and water supply pipes (including fire-fighting pipes) must meet the design requirements.
Requirements and construction specifications.
(2) Flexibility and rigidity of water pipe embedded through shear wall waterproof casing must be constructed in accordance with the civil air defense atlas and meet the design requirements and construction specifications, and the water supply system must be carried out before completion.
Rinse.
(3) The threaded pipe shall be clean and tidy, and the broken or missing wires shall not exceed 10% of the total number of threads, and the connection shall be firm. There is exposed thread at the root of pipe thread, and the hot-dip galvanized pipe ≤DN 100 must be connected by thread, the galvanized layer is intact, the exposed part must be painted with antirust paint, and there can be no twine at the interface.
(4) Flanged pipeline: Butt joints shall be parallel and closely perpendicular to the center line of the pipeline, screws shall be exposed from nuts, and gasket materials shall meet the design requirements and construction specifications, and there shall be no double layers.
(5) Welded pipeline: the flatness of weld and weld reinforcement surface shall conform to the construction specifications, and the weld surface shall be free of defects such as burn-through, crack, obvious nodulation, slag inclusion, air hole, etc.
(6) Pipe supports (hangers) and pipe sockets shall be installed correctly and buried neatly and firmly.
(7) The model, specification, compressive strength and leak test results of valve installation shall meet the design requirements and construction specifications, and the installation position and import and export direction shall be correct, and the connection shall be firm and tight.
(8) Paint for pipes and metal supports: The paint type and brushing times meet the design requirements, with good adhesion and no peeling, blistering and missing coating.