Check product certifications, quality assurance certificates, specifications, models, types, and quantities of required fittings, valves, pipe supports, fasteners, and seals. Perform a visual inspection.
Construction and Installation Points for Pipes
Company Name: Changsha Baoshan Building Materials Trading Co., Ltd.
Address: Baoli Valley, Linyu, Yuelu District, Changsha City
Contact: Pan Baoshan
Phone: [Service Hotline]
Website: http://
Before installing the pipeline, the following conditions should be met:
1. All construction drawings and technical documents must be complete, and technical briefings should have been conducted.
2. Verify product certifications, quality assurance certificates, specifications, models, types, and quantities of all necessary fittings, valves, and other components, and perform a visual inspection.
3. The construction site and utilities (water and power) must meet installation requirements.
4. Construction equipment must be on-site.
5. Any connected devices must be fixed or properly positioned.
Construction personnel must undergo technical training to understand the properties of steel-plastic composite pipes and master basic operational skills.
For steel-plastic composite pipes, the following tools are recommended:
1. Use a metal saw for cutting.
2. An automatic threading machine is required for threading.
3. A special groove machine should be used for grooving.
4. Elbows should be cold-bent using a bender.
Steel-plastic composite pipe installation procedures must follow these guidelines:
1. Indoor buried pipes should be installed before underground civil construction.
2. Buried pipes should extend at least 500mm beyond external walls, with timely sealing of the opening.
3. Do not bury steel-plastic composite pipes in reinforced concrete structural layers.
4. Pipe installation should proceed from larger to smaller diameters.
When pipes cross floors, roofs, or water tank walls, holes should be reserved or casings pre-embedded. These should meet the following requirements:
1. The hole size should be 40mm larger than the pipe's outer diameter.
2. When pipes are embedded in walls, the groove width should be 30mm wider than the pipe's outer diameter, and the slope should match the pipe's slope.
3. Pre-buried waterproofing casings are required for water tanks, ensuring proper embedding and compaction of waterproof concrete.
For pipes with a diameter ≤50mm, cold bending is allowed with a minimum radius of 8 times the diameter and a maximum bending angle of 100 degrees.
Pipes embedded in walls should be filled promptly after hidden works are completed.
Threaded Connections
Pipe cutting must meet the following requirements:
1. Use a pipe cutter; avoid grinding wheels. If a circular saw is used, speed should not exceed 800r/min.
2. When using a hand saw, ensure the cut is perpendicular to the pipe axis.
Threads must meet the following standards:
1. Use an automatic threading machine.
2. Lubricate the threading machine with oil.
3. Conical threads must comply with GB/T7306 and be tested with standard thread gauges.
Pipe end cleaning and processing:
1. Trim metal tube ends with a fine boring tool.
2. Clean the pipe ends and threads with cotton and brushes to remove oil, water, and metal shavings.
3. For lined plastic pipes, use a special reamer to chamfer the lining layer by 1/2 its thickness, with a slope of 100–150 degrees.
After cleaning, apply anti-corrosion and sealing treatment. Wrap the threads with rust-proof sealant and raw material tape, and mark the screw depth on the pipe wall with a marker.
Non-lined malleable cast iron fittings must not be used.
Before connecting the pipe to the fitting, inspect the rubber seal or anaerobic sealant in the lined malleable cast iron fitting. Then, manually screw the fitting onto the pipe thread. Once confirmed, connect the pipe and fitting using pliers as per Table 1.
Note: Do not rotate in the opposite direction.
After connection, coat exposed threaded parts and any damaged areas with rust-proof sealant.
Anaerobic-sealed joints require a curing period of at least 24 hours, during which no pressure testing should occur.
Steel-plastic composite pipes must not be directly connected to valves or water supply pipes. Instead, use special brass-lined transition joints.
When connecting to copper or plastic pipes, use a special transition joint.
Flange connections for steel-plastic composite pipes must meet the following standards:
1. Flat welded flanges must conform to GB/T9119.5~9119.10.
2. Convex neck flanges must comply with GB/T9114.1~9114.3 and are suitable for pipes with nominal diameters ≤150mm.
3. Flange pressure ratings must match the working pressure of the pipe.
On-site flange connections must follow these rules:
1. The pipe must meet the requirements of 6.2.1.
2. Use inner-lined plastic convex flanges when fitting on-site.
3. The threaded and sealed sections must conform to GB/T7306.
Flange connections can be done in one or two stages based on the skill level of the workers:
1. One-time installation: Measure on-site, draw a single-line diagram, send it to a factory for processing, then install on-site.
2. Two-stage installation: Install uncoated pipes and fittings on-site, weld flanges, then transport to a factory for coating and re-install.
When using the two-stage method, all on-site components must be stamped with a steel number.
General requirements for threaded flange and groove connections.
Inspection and Acceptance
The test pressure for steel-plastic composite water supply systems should be the same as for ordinary steel pipes.
Pressure testing procedures must be consistent with those for regular steel pipes. If tested together with plastic pipes, follow plastic pipe standards.
After pressure testing, drain the system and clean the pipelines. Drinking water pipes must also be disinfected to meet GB5749 standards.
Construction projects must be accepted according to national regulations, including sub-item, division, and unit project checks. Self-inspections should be conducted before intermediate and final acceptance. Records must be documented, signed, and filed.
Acceptance documentation should include:
1. Construction and as-built drawings, design changes.
2. Material and quality certificates.
3. Intermediate test records and hidden work acceptance.
4. Hydraulic pressure and flush test records.
5. Quality accident records.
6. Sub-item, division, and unit project quality inspection records.
During acceptance, check the following:
1. Ensure pipe and fittings match their intended use; cold water fittings cannot be used for hot water.
2. Confirm correct connections to valves or water supply plugs using special transition fittings.
3. Check that groove connections use special rubber seals.
4. Ensure no excessive exposed teeth on pipe joints.
5. Verify that the outer wall of pipes in water tanks is properly coated, supports are secure and corrosion-resistant, and waterproofing across walls is intact.
6. Inspect pipe position, diameter, elevation, slope, verticality, support location, and stability.
Anti-corrosion treatment for buried pipelines.
Groove Connections
Groove connections are suitable for coated (lined) plastic steel pipes with nominal diameters ≥65mm.
Groove joints must comply with national product standards.
The working pressure of the groove joint must match the pipe's operating pressure.
Hot water conveying grooves must use temperature-resistant rubber seals. Drinking water pipes must meet GB/T17219 standards.
When installing field grooves, ensure the following:
1. Prefer finished grooved fittings.
2. Connect pipe sections with a 6–8mm gap and stamp each joint.
3. Use a mechanical pipe cutter, ensuring the cut is perpendicular to the axis. Tolerance: ≤100mm diameter – ≤1mm; >125mm diameter – ≤1.5mm.
4. Machine the outer wall of the pipe with a 1/4 wall thickness rounding.
5. Use a special groove machine to press the groove. Keep the pipe horizontal, align the machine face with the pipe, and ensure continuous groove pressing. Groove depth must meet specified tolerances.
Groove Standard Depth and Tolerance (mm): ≤80: 2.20 +0.3 100–150: 2.20 +0.3 200–250: 2.50 +0.3 300: 3.0 +0.5 Steel-plastic composite pipe usage: 1. Use tools like hacksaw, boring tool, threading machine, and pipe wrench for connection. 2. Connection methods and pipe forms are similar to traditional galvanized pipes. Pipes with DN15–100 typically use this method. 3. Wrap joints with raw material tape to protect the entire steel-plastic composite pipe. 4. Avoid high-speed cutting methods like grinding wheels or gas cutting. Cut to half the steel pipe wall thickness, then break with a hand saw. This is generally not recommended, but if used, file burrs afterward. 5. Do not bend with heating. Use cold bending for manifolds, with a minimum radius of 6 times the diameter. 6. Use various standard pipe fittings for connections. 7. Ensure the wire mouth interface is clean. 8. Protect pipes from exposure, contamination, or damage during transportation. 9. Store in a warehouse with temperature ≤35°C, away from heat sources, for up to 1 year from production. Product Features: A. Safe, eco-friendly, hygienic, and high-strength. B. Bonding technology ensures strong adhesion between steel and plastic, reaching 4.3MPa. C. Secondary sealing uses natural silicone rubber to prevent internal corrosion and ensure water quality. Jin brand steel-plastic composite water pipe applications: 1. Hot and cold drinking water systems 2. Building pure water pipelines 3. Building fire protection systems 4. Central air conditioning and heating systems 5. Chemical production medium pipelines PPR Construction Requirements: 1. Use special hot-melt welding for water pipes. (1) Cut vertically with a pipe cutter. Remove burrs and mark hot-melt plug depth (e.g., 20, 25M = ~15MM). (2) Heat the pipe and fittings to 260°C, insert into the fusion splicer die for at least 5 seconds. (3) Insert quickly without rotation. (4) Cool for 3–5 minutes. Inspection and Acceptance: After installation, a hydraulic test is required to confirm good welding. Otherwise, the pipeline must not be concealed. Steps: 1. Seal the pipe end, fill with water, and vent air. Check the water seal. 2. Slowly increase pressure with a manual pump for at least 10 minutes. 3. At the test pressure (usually ≥1.0MPA), stop pressurizing and observe for leaks. 4. After regulation, check for a pressure drop of ≤0.05MPA within 15 minutes. * Retain original pressure test records and user signatures. Bridge and Gantry Crane Safety Technical Inspection Program (Special Inspection) The above content was compiled based on common issues faced by students in real-world work. For reference only. Please communicate and correct any issues promptly. Http://news.chinawj.com.cn
Editor: (Hardware Business Network Information Center)
Http://news.chinawj.com.cn
Construction and Installation Points for Pipes
Company Name: Changsha Baoshan Building Materials Trading Co., Ltd.
Address: Baoli Valley, Linyu, Yuelu District, Changsha City
Contact: Pan Baoshan
Phone: [Service Hotline]
Website: http://
Before installing the pipeline, the following conditions should be met:
1. All construction drawings and technical documents must be complete, and technical briefings should have been conducted.
2. Verify product certifications, quality assurance certificates, specifications, models, types, and quantities of all necessary fittings, valves, and other components, and perform a visual inspection.
3. The construction site and utilities (water and power) must meet installation requirements.
4. Construction equipment must be on-site.
5. Any connected devices must be fixed or properly positioned.
Construction personnel must undergo technical training to understand the properties of steel-plastic composite pipes and master basic operational skills.
For steel-plastic composite pipes, the following tools are recommended:
1. Use a metal saw for cutting.
2. An automatic threading machine is required for threading.
3. A special groove machine should be used for grooving.
4. Elbows should be cold-bent using a bender.
Steel-plastic composite pipe installation procedures must follow these guidelines:
1. Indoor buried pipes should be installed before underground civil construction.
2. Buried pipes should extend at least 500mm beyond external walls, with timely sealing of the opening.
3. Do not bury steel-plastic composite pipes in reinforced concrete structural layers.
4. Pipe installation should proceed from larger to smaller diameters.
When pipes cross floors, roofs, or water tank walls, holes should be reserved or casings pre-embedded. These should meet the following requirements:
1. The hole size should be 40mm larger than the pipe's outer diameter.
2. When pipes are embedded in walls, the groove width should be 30mm wider than the pipe's outer diameter, and the slope should match the pipe's slope.
3. Pre-buried waterproofing casings are required for water tanks, ensuring proper embedding and compaction of waterproof concrete.
For pipes with a diameter ≤50mm, cold bending is allowed with a minimum radius of 8 times the diameter and a maximum bending angle of 100 degrees.
Pipes embedded in walls should be filled promptly after hidden works are completed.
Threaded Connections
Pipe cutting must meet the following requirements:
1. Use a pipe cutter; avoid grinding wheels. If a circular saw is used, speed should not exceed 800r/min.
2. When using a hand saw, ensure the cut is perpendicular to the pipe axis.
Threads must meet the following standards:
1. Use an automatic threading machine.
2. Lubricate the threading machine with oil.
3. Conical threads must comply with GB/T7306 and be tested with standard thread gauges.
Pipe end cleaning and processing:
1. Trim metal tube ends with a fine boring tool.
2. Clean the pipe ends and threads with cotton and brushes to remove oil, water, and metal shavings.
3. For lined plastic pipes, use a special reamer to chamfer the lining layer by 1/2 its thickness, with a slope of 100–150 degrees.
After cleaning, apply anti-corrosion and sealing treatment. Wrap the threads with rust-proof sealant and raw material tape, and mark the screw depth on the pipe wall with a marker.
Non-lined malleable cast iron fittings must not be used.
Before connecting the pipe to the fitting, inspect the rubber seal or anaerobic sealant in the lined malleable cast iron fitting. Then, manually screw the fitting onto the pipe thread. Once confirmed, connect the pipe and fitting using pliers as per Table 1.
Note: Do not rotate in the opposite direction.
After connection, coat exposed threaded parts and any damaged areas with rust-proof sealant.
Anaerobic-sealed joints require a curing period of at least 24 hours, during which no pressure testing should occur.
Steel-plastic composite pipes must not be directly connected to valves or water supply pipes. Instead, use special brass-lined transition joints.
When connecting to copper or plastic pipes, use a special transition joint.
Flange connections for steel-plastic composite pipes must meet the following standards:
1. Flat welded flanges must conform to GB/T9119.5~9119.10.
2. Convex neck flanges must comply with GB/T9114.1~9114.3 and are suitable for pipes with nominal diameters ≤150mm.
3. Flange pressure ratings must match the working pressure of the pipe.
On-site flange connections must follow these rules:
1. The pipe must meet the requirements of 6.2.1.
2. Use inner-lined plastic convex flanges when fitting on-site.
3. The threaded and sealed sections must conform to GB/T7306.
Flange connections can be done in one or two stages based on the skill level of the workers:
1. One-time installation: Measure on-site, draw a single-line diagram, send it to a factory for processing, then install on-site.
2. Two-stage installation: Install uncoated pipes and fittings on-site, weld flanges, then transport to a factory for coating and re-install.
When using the two-stage method, all on-site components must be stamped with a steel number.
General requirements for threaded flange and groove connections.
Inspection and Acceptance
The test pressure for steel-plastic composite water supply systems should be the same as for ordinary steel pipes.
Pressure testing procedures must be consistent with those for regular steel pipes. If tested together with plastic pipes, follow plastic pipe standards.
After pressure testing, drain the system and clean the pipelines. Drinking water pipes must also be disinfected to meet GB5749 standards.
Construction projects must be accepted according to national regulations, including sub-item, division, and unit project checks. Self-inspections should be conducted before intermediate and final acceptance. Records must be documented, signed, and filed.
Acceptance documentation should include:
1. Construction and as-built drawings, design changes.
2. Material and quality certificates.
3. Intermediate test records and hidden work acceptance.
4. Hydraulic pressure and flush test records.
5. Quality accident records.
6. Sub-item, division, and unit project quality inspection records.
During acceptance, check the following:
1. Ensure pipe and fittings match their intended use; cold water fittings cannot be used for hot water.
2. Confirm correct connections to valves or water supply plugs using special transition fittings.
3. Check that groove connections use special rubber seals.
4. Ensure no excessive exposed teeth on pipe joints.
5. Verify that the outer wall of pipes in water tanks is properly coated, supports are secure and corrosion-resistant, and waterproofing across walls is intact.
6. Inspect pipe position, diameter, elevation, slope, verticality, support location, and stability.
Anti-corrosion treatment for buried pipelines.
Groove Connections
Groove connections are suitable for coated (lined) plastic steel pipes with nominal diameters ≥65mm.
Groove joints must comply with national product standards.
The working pressure of the groove joint must match the pipe's operating pressure.
Hot water conveying grooves must use temperature-resistant rubber seals. Drinking water pipes must meet GB/T17219 standards.
When installing field grooves, ensure the following:
1. Prefer finished grooved fittings.
2. Connect pipe sections with a 6–8mm gap and stamp each joint.
3. Use a mechanical pipe cutter, ensuring the cut is perpendicular to the axis. Tolerance: ≤100mm diameter – ≤1mm; >125mm diameter – ≤1.5mm.
4. Machine the outer wall of the pipe with a 1/4 wall thickness rounding.
5. Use a special groove machine to press the groove. Keep the pipe horizontal, align the machine face with the pipe, and ensure continuous groove pressing. Groove depth must meet specified tolerances.
Groove Standard Depth and Tolerance (mm): ≤80: 2.20 +0.3 100–150: 2.20 +0.3 200–250: 2.50 +0.3 300: 3.0 +0.5 Steel-plastic composite pipe usage: 1. Use tools like hacksaw, boring tool, threading machine, and pipe wrench for connection. 2. Connection methods and pipe forms are similar to traditional galvanized pipes. Pipes with DN15–100 typically use this method. 3. Wrap joints with raw material tape to protect the entire steel-plastic composite pipe. 4. Avoid high-speed cutting methods like grinding wheels or gas cutting. Cut to half the steel pipe wall thickness, then break with a hand saw. This is generally not recommended, but if used, file burrs afterward. 5. Do not bend with heating. Use cold bending for manifolds, with a minimum radius of 6 times the diameter. 6. Use various standard pipe fittings for connections. 7. Ensure the wire mouth interface is clean. 8. Protect pipes from exposure, contamination, or damage during transportation. 9. Store in a warehouse with temperature ≤35°C, away from heat sources, for up to 1 year from production. Product Features: A. Safe, eco-friendly, hygienic, and high-strength. B. Bonding technology ensures strong adhesion between steel and plastic, reaching 4.3MPa. C. Secondary sealing uses natural silicone rubber to prevent internal corrosion and ensure water quality. Jin brand steel-plastic composite water pipe applications: 1. Hot and cold drinking water systems 2. Building pure water pipelines 3. Building fire protection systems 4. Central air conditioning and heating systems 5. Chemical production medium pipelines PPR Construction Requirements: 1. Use special hot-melt welding for water pipes. (1) Cut vertically with a pipe cutter. Remove burrs and mark hot-melt plug depth (e.g., 20, 25M = ~15MM). (2) Heat the pipe and fittings to 260°C, insert into the fusion splicer die for at least 5 seconds. (3) Insert quickly without rotation. (4) Cool for 3–5 minutes. Inspection and Acceptance: After installation, a hydraulic test is required to confirm good welding. Otherwise, the pipeline must not be concealed. Steps: 1. Seal the pipe end, fill with water, and vent air. Check the water seal. 2. Slowly increase pressure with a manual pump for at least 10 minutes. 3. At the test pressure (usually ≥1.0MPA), stop pressurizing and observe for leaks. 4. After regulation, check for a pressure drop of ≤0.05MPA within 15 minutes. * Retain original pressure test records and user signatures. Bridge and Gantry Crane Safety Technical Inspection Program (Special Inspection) The above content was compiled based on common issues faced by students in real-world work. For reference only. Please communicate and correct any issues promptly. Http://news.chinawj.com.cn
Editor: (Hardware Business Network Information Center)
Http://news.chinawj.com.cn
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