1. Indoor Water Supply Project
The pressure test results of each system conform to the design requirements and there is no leakage. Pipelines must be cleaned. Pipelines and supports (piers) are not on permafrost or rotten soil.
(1) Pipeline gradient
Qualification: The positive and negative deviation of the slope does not exceed 1/3 of the slope value requested by the design. The device is horizontal and vertical, and the distance from the wall and the elevation basically conforms to the rules.
Excellent: Slope conforms to the design requirements, and the average difference between the wall and the elevation conforms to the rules.
(2) Pipeline interface
<1> wire bonding
Qualified: The processing accuracy of pipe thread conforms to the rules of national standard "pipe thread". The thread is clean and regular. The broken or missing thread is not more than 10% of the whole thread. The connection is firm, the root has exposed threads, the galvanized pipe has no welds, the threads are clean and regular, the pipe fittings are used correctly, and the galvanized pipe has no welds.
Excellent: On the qualified foundation, no broken thread; galvanized pipe and pipe fittings galvanized layer without damage, good anti-corrosion of exposed threads and no exposed flax and other defects.
<2> flange connection
Qualified: parallel and tight butt, perpendicular to the center line of the pipe, screw exposed nuts; Material of pad conforms to design requirements and construction standard rules without double layers, flange type conforms to requirements.
Excellent: On the qualified base, the nut is on the same side, the length of the nut is different, and it is not more than half of the diameter of the screw.
Qualification: weld flatness, weld reinforcement surface conform to the construction standard rules; weld appearance without burnout; cracks and obvious nodules, slag inclusion and porosity defects.
Excellent: On the basis of eligibility, the welding waves are different on average, and there are no nodules, slag inclusions and blowhole on the surface of the weld.
<4> Undertake and hoop.
Qualification: interface construction and fillers used conform to design requirements and construction standard rules; gray mouth is dense and plump, filler concave into the edge of the bearing is not more than 2 mm, the rubber ring joint is straight and without distortion; the counterpart clearance is accurate, and the fittings are used correctly.
Excellent: On the basis of qualified, the annular gap is average, the gray mouth is smooth, lubricated, and well maintained. The springback gap of the apron joint conforms to the construction standard rules.
(3) Pipeline support
Qualified: The structure is correct, the embedment is flat and solid, the location is reasonable, and the elevation spacing is in accordance with the rules. Paint varieties and brushing times meet the design requirements; good adhesion, no peeling, blistering and leakage.
Excellent: On the basis of qualified, the arrangement is uniform, the thickness of the paint film is average, the color is different, and there is no flow and pollution.
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