PB tube design pressure and working pressure.

- Feb 25, 2018-

Preparation before construction.

1. The construction personnel must be familiar with the scheme and design specifications of the project and relevant specifications and regulations.

2. The construction personnel must be on the job with the plumber's certificate, and the technical training for the installation of the building water polypropylene pipe can be carried out.

3. The machine tools and related equipment used must be in good performance to ensure normal construction.

4. The construction site should be flat and clean, and no sand and other debris shall be allowed, and there is no obvious elevation deviation.

5. Temporary facilities such as electricity, water and material storage, etc. can meet the construction needs.

When the environmental temperature under 10 ℃ when, should stop construction or use the winter construction scheme.

1. Indoor pipe laying.

(1) installing a dark apply line, appropriate cooperates the civil reserved groove, groove surface must level off, can not have sharp corners, slag, dust and other protrusions, its size and the provisions of the design without the depth of the groove for De + 40 mm, width is 300 mm. The pipe in the hollow shall be constructed strictly according to the drawing position and shall be laid on the wall to avoid damage to the pipe during the secondary decoration.

(2) when the pipe clamp is installed in the groove, the spacing is 1000mm, and the double-tube card shall be on the same axis.

(3) the hot water (heating) pipe is buried directly in the groove, because the cement mortar restricts the thermal expansion of the pipe, so it is not considered the longitudinal expansion compensation. When the radiator is installed, the vertical pipe shall be less than or equal to 1 meter, and a fixed card shall be installed. The distance from the ground is 600mm, and the pipe length of the radiator pipe (water supply) shall be no less than 200mm. Note :(horizontal water supply pipe has an anti-slope of 0.5cm).

(4) the laying of the pipes under the indoor floor (+ 0.00) shall be reopened after the reclamation of the civil works. The bottom of the laying pipe shall be flat and shall not have prominent sharp objects. The grain diameter of the soil should not be greater than 12mm, and the sand cushion layer can be 100mm thick when necessary.

(5) the first layer when the backfill of buried pipeline pipe weeks backfill shall not direct contact with the wall with hard objects, you should use sand or single particle size is not more than 12 mm of backfill soil and the tube on top of 300 mm, the buried pipeline pipe roof embedment depth shall be not less than 300 mm.

(6) the installation of the installation pipe shall be carried out after the construction of the soil is finished. The installation shall be preceded by the construction of the reserved hole or the embedded casing. It is forbidden to force correction when installing the wall or through the floor. When the pp-r pipeline is parallel to the metal pipe, it shall have a certain protection distance. The net distance is not less than 100mm, and the pp-r tube is suitable for the inside of the metal pipe.

(7) steel sleeve should be set when crossing the floor. The casing should be more than 50mm above the ground and have good waterproof measures.

(8) when the hot water pipe is in the wall, the steel sleeve should be set, and the burr shall be removed in the steel casing. When the cold water pipe is in the wall, the hole can be reserved. The hole size is 50mm larger than the outer diameter. PVC sleeve should be used when wearing the simple wall to prevent damage to the surface of the pipe.

(9) when the pipe is worn on the foundation wall, the steel sleeve should be set, and the net air at the top of the reserved hole of the foundation wall should be set. If the design is not specified, it should not be less than 100mm.

(10) when the supporting hanger of the Ming tube is used as the pipe expansion compensation, the construction shall be carried out according to the fixed point, and the water distribution points, bearing points and the wall branch joints shall be used with reliable and fixed measures.

(11) when piping is used for pumping out water pipes, technical measures shall be taken to eliminate water hammer.

2. Outdoor piping installation.

When laying the pipe outside, the bottom of the groove should be level, and the pipe should be covered with 100mm thick sand cushion and then backfill. When crossing the street in the pipe roof distance from the road surface is not less than 800 mm, sidewalks and other local tube top buried depth is not less than 600 mm, to ensure the quality of frost layer and the construction, such as the requirement not be reached, must add steel casing and other protective measures.

3. Check the acceptance record of air pressure test and concealed works before sealing.

Winter construction requirements

1, indoor construction in addition to the requirements stipulated by the general, you should also comply with the winter construction requirements, such as: put in the pipes from the material storage to the construction site, with a small sun, heating equipment, such as hot air blower will melt it heated to a temperature above 10 ℃ environment around, can the construction, it is forbidden to use fire to bake.

2, outdoor construction in addition to the requirements stipulated by the general, you should also comply with the winter construction requirements, such as: put in the pipes from the material storage to the construction site, the simple wind and melt it in airtight cabin, with a small sun, heat fan heating will melt it external environments such as temperature rose to more than 10 ℃, and then to weld, open flame is strictly prohibited.

Construction quality requirements

1. In addition to the design basis of the project, the construction and installation shall be in accordance with the code for construction and acceptance of heating and sanitary works (GB/ j242-82) and related specifications and regulations.

2. Avoid crossing the pipe when passing through the dark beam, the center of the hall and the doorway.

3. The specifications, models and pressure levels of the installation pipes and fittings shall conform to the design and acceptance specifications.

4, when the environment temperature is below 10 ℃, the pipe by the chemical properties of the material itself factors, when external force is easily broken, so in winter construction, to operate carefully, not behind, fell, rolling of pipes, drag, impose undue outside force.

5, in the environmental temperature under 10 ℃ when, continue to construction, will seriously affect the construction quality, so must be conducted in accordance with the requirements of winter construction construction.

6, for tapping, installed in the pipe can't weight, when it is necessary to cover protection to vulnerable to external forces, especially no floor closed well pipe to the water pipes, should do more protective measures, avoid knock against, and the weight (brick) impact on PP - R.

7, when construction environment temperature is less than 10 ℃ to 5 ℃, hot-melt pipe heating time should be extended by 50%, and adjust the time should be shortened.

8. After the water pressure test of the pipe in the groove is qualified, it is necessary to fill the compaction with no less than C20 cement mortar and add the condensing agent. Otherwise, due to the thermal expansion and contraction of the pipe, it will cause the ground cracking. Especially hot water (heating) pipes.

9. Hot water (heating) pipes shall be pipe fittings not less than 2.0Mpa grade.

10. During the installation of piping system, the opening should be plugged in time.

11. It is strictly forbidden to heat the pp-r pipes and fittings of different brands.

12. It is not allowed to use wire or flange connection for the pipe under the floor or inside the wall.

13. The pp-r tube shall not be connected directly to the water heater or hot water unit, and shall be made of a metal tube with a length of no less than 400mm.

14. When entering the construction site, the shoes should be soft-soled. During the construction process, the workers should carefully operate and properly keep the tools to avoid damage to the pipes.

Water pressure test, flushing, disinfection and acceptance of pipe.

1. Water pressure test.

(1) the test pressure of the cold water pipe shall be 1.5 times of the working pressure of the system, but not less than 0.9pa.

(2) the test pressure of the hot water pipe shall be 2.0 times the working pressure of the system, but shall not be less than 1.2mpa.

(3) pipes buried directly in the floor and inside the wall. The water pressure test must be carried out before the tamping or sealing, and the construction can be continued after the test pressure is qualified.

(4) piping for hot melt connection, water pressure test shall be conducted after the pipe connection is 24h.

(5) water pressure test shall meet the following requirements:

The total length of the test tube section should not exceed 500m.

Before the test, the pipe shall be fixed, the joint shall be exposed, and the water distribution equipment shall not be connected;

The pressure gauge is installed at the lowest point of the test tube section and the pressure accuracy is 0.01MPa.

The pipe is filled with water from the lowest part of the pipe, and the air in the pipe is completely excluded and the water tightness is checked.

The pressure of the pipe is slowly increased, and the lift pressure is not less than 10min with the manual pump.

After the pressure is increased to the specified test pressure, the pressure drop shall not exceed 0.06MPa.

Under the condition of 1.15 times of working pressure, the pressure drop should not exceed 0.03MPa.

In the process of experiment. No leakage at all joints is qualified;

Note: in 30 minutes, two additional pressures are allowed to rise to the specified test pressure.

(6) after the water pressure test is qualified, the pipe end shall be connected with the water distribution part, and the water supply of the pipe network shall be designed, and the water distribution parts shall be opened at the same time.

2. Cleaning and disinfection of pipes.

(1) the water supply piping system shall be cleaned by water before acceptance of the test. When cleaning, open each water distribution point water mouth, left corner the lowest of the system should be set discharge opening, cleaning time control in the discharge opening of the effluent water quality and water quality is quite so far, flushing water flow velocity should not less than 1.0 m/s.

(2) after the cleaning of the piping system, clean water with 20-30mg/L free chlorine is applied to disinfect the pipe, and the chlorine water should be placed in the pipe for more than 24h.

(3) after cleaning the pipe, clean it with drinking water and pass the inspection by the health supervision and administration department before delivery.

3. Quality acceptance

Acceptance among

For the installation of concealed pipes and fittings, the water pressure test shall be carried out by the construction unit and the supervision unit.

(1) the cold and hot water pipes shall not be confused;

(2) installation position and fastness of pipe support and hanger;

(3) the opening and closing flexibility and fixed fastness of valve and water distribution parts;

(4) the neatness, firmness and tightness of the connection interface;

(5) the water flow of the distribution point is smooth, and the vibration and noise level when it is closed;

(6) selection, thickness and practice of insulation materials;

(7) the rationality of compensation pipeline expansion and deformation measures.

(8) accuracy of elevation and slope.

The overall acceptance

General acceptance conditions:

(1) construction drawings, completion drawings and design change documents.

(2) field acceptance records of pipes, fittings and quality assurance materials.

(3) concealed work acceptance records and intermediate experimental records.

(4) air pressure test and ventilation capacity test record.

(5) air purge and disinfection records of domestic drinking water pipe, and the qualified report of pipeline ventilation disinfection issued by the health and epidemic prevention department.

(6) record of engineering quality accident treatment.

(7) quality inspection and evaluation record.

Storage protection requirements for finished products.

1. The completed pp-r pipeline is strictly prohibited to impact or hammer metal nails or hammer, heavy or heavy objects on the pipe.

2. In winter, it is strictly prohibited to save water during the non-use period to prevent the freezing of the pp-r pipeline.

3, winter when transporting pipe and pipe fittings, should handle with care, avoid the oil, it is forbidden to hit, with sharp objects touched and cast, fell, rolling, drag, etc., avoid to cause damage pipes, pipe fittings, affect the service life of the pipe and construction quality.

4. The pipes and fittings shall be stored in the storehouse or in a simple shed, and shall not be stored in the open air to prevent direct sunlight, and be careful of the open fire, and shall not be less than 1 meter away from the heat source.

5. The pipe should be stacked horizontally on the flat floor, avoiding bending pipes, and the height of pile height should not exceed 1.5m, and the pipe should be piled up by layer, not too high.