As galvanized pipes are easy to rust, foul, do not keep warm, and will freeze and crack, they will be phased out. At present, the most used are plastic-aluminum composite pipe, plastic steel pipe, and PPR pipe. These pipes have good plasticity and toughness, and the heat preservation does not crack or deposit. Special copper joints or thermoplastic joints are used, which guarantees quality and low energy consumption.
Details of water supply and drainage acceptance: 1. Check whether the quality of hot and cold water pipes meets the standards: check whether the hot and cold water pipes meet health standards and safety standards; measure the diameter and wall thickness of the flow pipe; figure out the material of the water pipe. At present, the most commonly used PPR pipes are steel pipes, copper pipes and galvanized pipes. There are differences between the cold and hot water pipes of plastic water pipes such as PPR, and the wall thickness of the hot water pipe is 2 mm than that of the cold water pipe. 2. Whether the installation of hot and cold water pipes meets the specifications: The installation of water pipes has certain specifications and techniques. Carefully check whether the connection of the water pipes is tight and leaking. The installation of the pipes must be firm, and the pipes must be around the casing of the wall. Do fire blocking treatment. 3. Whether the water meter has quality problems: visually check whether the water meter has a protective cover and lightning protection ground connection, and run a test to check whether the meter count is normal. 4. Open the faucet to see if there is water, what is the quality of the water, and if there is rust on the stop valve that affects the water quality, it can be replaced by the developer. Check each faucet and observe whether there is any seepage, leakage or blockage in the upper and lower water pipes. It should be noted that the water flow should be as large and urgent as possible. First, check the water pressure, and second, try the drainage speed. 5. Check whether the water pipe has enough water pressure: This requires a pressure measuring instrument to detect the specific water pressure, but the water pressure is checked visually to see if it can meet the normal water supply of the family. 6. Whether the sewer pipe is unblocked and whether there is leakage: the detection of the sewer pipe is difficult and requires professional equipment, but you can test it with a bucket of water to see if the sewer pipe is unblocked.
Water supply and drainage acceptance specifications: 1. Guarantee items: (1) All materials, appliances, etc. must be products produced by regular manufacturers that meet the relevant national quality standards, meet the design requirements and have been reviewed and approved by the supervision engineer on site to use the products ( This article applies to all sub-specialties of hydropower installation). (2) The pressure test results of each system, the pressure meets the design requirements, and there is no leakage. The pipes must be cleaned, and the pipes and supports (piers) must not be on frozen soil and rotten wood. Pipes passing through the roof and floor slabs shall be embedded with casing pipes and water-stop rings, and the joint head shall not be buried in the wall or floor. 2. Basic items: (1) Pipeline slope water supply horizontal pipe should have a slope of 0.002~0.005 slope and slope drainage device, and the water meter should be 10-30mm away from the wall, the horizontal pipe is along the wall, and the riser is due to the water meter or faucet. Depending on the location, the height deviation of the different outlets is less than 10mm. Pipes with parallel hot and cold water should follow the principle of hot top and cold bottom, hot left and cold right, and hot inside and cold outside. (2) Pipeline interface (wire connection) The processing accuracy of pipe thread meets the requirements of the specification, there is no broken wire, bite wire disorder, the connection is firm, and the root has 2-3 wires exposed (3-4 wires above DN80) Thread, galvanized pipe without weld (except for flanges to be welded). Use the pipe fittings correctly, the galvanized pipe and the galvanized layer of the pipe fittings are not damaged, the exposed thread has good corrosion resistance, and there are no defects such as exposed oil hemp. If the sprinkler pipeline needs to be reduced in diameter, it should use reduced diameter pipe fittings, and should not use filler core reducing diameter, and the PP-R pipe joints should be fully welded and not deformed.
Acceptance methods for water supply and drainage: 1. Check whether the quality of hot and cold water pipes meets the standards: check whether the hot and cold water pipes meet health standards and safety standards; measure the diameter and wall thickness of the flow pipe; figure out the material of the water pipe. At present, the most commonly used PPR pipes are steel pipes, copper pipes and galvanized pipes. There are differences between the cold and hot water pipes of plastic water pipes such as PPR, and the wall thickness of the hot water pipe is 2 mm than that of the cold water pipe. 2. Whether the installation of hot and cold water pipes meets the specifications: The installation of water pipes has certain specifications and techniques. Carefully check whether the connection of the water pipes is tight and leaking. The installation of the pipes must be firm, and the pipes must be around the casing of the wall. Do fire blocking treatment. 3. Whether the water meter has quality problems: visually check whether the water meter has a protective cover and lightning protection ground connection, and run a test to check whether the meter count is normal. 4. Open the faucet to see if there is water, what is the quality of the water, and if there is rust on the stop valve that affects the water quality, it can be replaced by the developer. Check each faucet and observe whether there is any seepage, leakage or blockage in the upper and lower water pipes. It should be noted that the water flow should be as large and urgent as possible. First, check the water pressure, and second, try the drainage speed. 5. Check whether the water pipe has enough water pressure: This requires a pressure measuring instrument to detect the specific water pressure, but the water pressure is checked visually to see if it can meet the normal water supply of the family. 6. Whether the sewer pipe is unblocked and whether there is leakage: the detection of the sewer pipe is difficult and requires professional equipment, but you can test it with a bucket of water to see if the sewer pipe is unblocked.
Acceptance standards for water supply and drainage: 1. The quality of water supply and drainage pipes and fittings must meet the requirements of the standard, and the drainage pipes should be made of rigid PVC drainage pipes and fittings. 2. It is necessary to check whether the original pipeline is unblocked before construction, and then perform construction, and check whether the pipeline is unblocked after construction. Concealed water supply pipelines should be inspected for water supply. Newly installed water supply pipelines must be pressure tested in accordance with relevant regulations and there should be no leakage. Only after passing the inspection can they enter the next process for construction. 3. The drainage pipe should be temporarily sealed to the original pipe before construction to prevent debris from entering the pipe. 4. For the installation of water supply pipes with an outer diameter of less than 25mm, pipe clamps should be installed at the corners, water meters, faucets or angle valves and 100 mm at the end of the pipes. The pipe clamps must be installed firmly. The pipes shall be threadedly connected. There shall be exposed threads at the joints, and shall be fixed with pipe clamps in time after installation, and there shall be no looseness between pipes and pipe fittings or valves. 5. The positions of the various valves installed should meet the design requirements for easy use and maintenance. 6. All joints, valves and pipeline connections should be tight, no leakage, and the slope of the pipeline should meet the requirements.