embedded work seriously familiar with drawings and specification requirements

embedded work seriously familiar with drawings and specification requirements, check the consistency of the civil engineering drawings and installation drawings, the actual inspection embedded parts, the location of the hole, style and size, cooperate with construction in a timely manner all kinds of holes reserved and embedded pipe, the embedded parts of embedding, ensure embedding is correct and omission.

3. The pipeline alignment of surveying and mapping. Before the measurement shall be carried out with construction unit (or supervisor) measurement datum transfer, the use of measuring instruments shall JingJian qualified and within the period of validity, and conform to the requirements of the accuracy of measurement. According to construction drawings for in-situ measuring unreeling, to determine the steam-water pipes and its elevation and location. Using computer CAD software or BIM technology such as space simulation, collision detection, found the problem in advance, avoiding the phenomenon of pipeline between fight.

5 P180.

4. Pipeline inspection of components. Piping components including of piping and piping support parts, should be carefully checked before installed components specifications, material quality, appearance quality and the quality certificate, etc., there is a requirement for the reinspection for components should also conduct re-inspection, such as: alloy steel pipe and components should be carried out inspection, etc.

(1) pipe flow meter and pressure gauge should be used for calibration verification, equipment and piping of the relief valve should be set by has the qualification of the unit.

(2) valve should be in accordance with the specification requirements for strength and leak test, the test should be in each batch number (same brand, same model and specifications) of the spot check by 10%, and no less than one. The strength of the valve and leak test, shall meet the following requirements:

The strength test pressure valve is 1.5 times of the nominal pressure; Leak test pressure is

1.1 times the nominal pressure; Test pressure in the test duration shall remain unchanged, and shell packing and clapper sealing surfaces without leakage. Installed on the ZhuGanGuan closed-circuit valves, cut off the role should be individually do strength test

and leak test.

5. Pipe support production installation. Pipe support, support and hanger production installation, should strictly control the welding quality and the structure of steam-water, such as: rolling stents, sliding bracket and fixed bracket, spring hanger, etc. Stents when installation should be carried out in accordance with the surveying and mapping the location of the pay-off to, the installation position should be accurate and reasonable spacing, scaffolds should be fixed firmly, sliding direction or thermal expansion direction should comply with the specification requirements.

6. Prefabricated pipe processing. Piping prefabrication shall, according to the actual size of surveying and mapping, pay-off, based on the principle of first prefabricated first installation, prefabrication pipe section should be grouped number, the installation site of prefabricated pipe should consider convenient transportation, prefabricated stage should be performed at the same time of pipeline inspection and primer coating work.

7. Piping installation

(1) after pipe installation shall generally be competent in the first branch pipe, the lower after the upper first, after the first outside the principle for installation, for different material pipes should be installed steel pipe, plastic pipe after installation, when the pipeline through the basement side wall should be at the end of the indoor plumbing installation again for installation, the installation process should pay attention to product protection. The main installation connection way of threaded connection, socket connection, flange connection, bonding, welding, hot melt connection, fused connection, etc.

(2) hot and cold water pipe parallel installation of hot water piping should be up and down in the cold water pipe above, in the cold water pipe on the left side of the vertical installation of hot water pipes. Drains should strictly control of slope and slope direction, when slope design did not indicate the installation, should be executed in accordance with the corresponding construction specifications. Indoor sewage pipe should be according to different materials such as cast iron pipe, plastic pipes and pipe diameter setting drainage slope, slope of cast iron pipe shall be higher than that of plastic pipe slope. Outdoor

drainage pipe slope must comply with the design requirements, it is strictly prohibited to no slope or the slope.

(3) the water tube and the drainage outlet pipe of a horizontal interval shall not be less than 1 m. Indoor water supply and drainage pipeline parallel installation, the minimum level of net distance between the two pipe shall not be less than 0.5 meters; Cross laid, vertical clearance should not be less than 0.15 meters.

Above the feed pipe should be spread in the drainage pipe, if the feed pipe must lay at the bottom of the drain, feed pipe should add casing, the length shall not be less than three times as much of a drain pipe diameter.

(4) the buried pipelines in the piping, condole top, concealed before the end of the installation should be concealed engineering acceptance, and make records.

8. System test. Building pipeline engineering trials should include: pressure pipeline and equipment system pressure test, unconfined water pipeline and equipment system test, the main drain ball-passing, water test, fire hydrant system test, test, etc.

(1) the pressure test

Pipeline pressure test should be at the end of the pipe system installation, upon passing the appearance inspection, pipe fixed firmly, nondestructive testing and heat treatment, ensure that piping is no longer qualified to opening, on the basis of the welding operation. 6 P181

1) the test pressure shall be carried out according to the requirements of design, when design did not indicate the test pressure shall be carried out in accordance with the requirements of specification. All kinds of test pressure of the water pipeline system are 1.5 times the working pressure, but shall not be less than 0.6 million mpa, metal and pipe water supply piping system under the pressure test observation for 10 minutes, pressure should not be greater than 0.02 million mpa, then checked to pressure of work, should not leak; Plastic water supply system should be regulated under test pressure for 1 hour, the pressure drop shall not exceed 0.05 million mpa, and then under the working pressure of

1.15 times the state regulator 2 h, pressure shall not exceed 0.03 million mpa, at the same time check the joint leakage is not allowed.

2) pressure test appropriate USES and should establish special hydraulic test, when the need for pressure test shall be approved by the designer.

3) to high-level, high-rise building pipe should be according to the partition, segments, qualified after the whole experiment was carried out according to the system.

(2) experimental

1) indoor hidden or buried pipes must be done before the hidden water test, the water height should be not less than the underlying sanitary ware on edge or the height of the underlying. Irrigation to filled with water for 15 minutes, the water drop again after filling observation for 5 minutes, liquid level does not drop, no leakage for qualified for pipeline and interface.

2) outdoor drainage pipe network according to the drainage well segmented tests, test head shall be made in test section upstream tube top to add 1 meter, time not less than 30 minutes, is presented.the observation, no leakage for qualified pipe interface.

3) indoor storm sewer should choose according to tubing and building height on the entire length of irrigation experiment way or segment. The shuttle test should reach the water height of the upper part of the riser rainwater head, stable when the water reaches the surface observation after 1 hour, no leakage for qualified for pipeline.

(3) pass ball test

Drainage pipe main riser and horizontal main installation shall be made after the ball test, pass the ball the ball diameter not less than two-thirds of the drainage pipe diameter, pass the ball rate must reach 100%.

(4) the fire hydrant test experiment

1) indoor fire hydrant system test should be done to test after the installation is complete. Test test generally take representative three places: the roof (or water) take a first layer and take two.

2) roof test with hydrant test can be measured out of the water flow and pressure of the fire hydrant (full water column); First take two fire hydrant test, can test the ability of two full water jet at the same time reach the apogee.

(5) water test

本文来源：https://www.bwwdw.com/article/b3o4.html