1. When the reclaimed water pipe network is designed and installed, the reclaimed water system needs to be equipped with tap water supply pipe as backup water source.

2. Design water supply system and reclaimed water system, and use high water tank for water supply. The minimum pressure at the lower (most unfavorable) water distribution point of the water tank shall meet the specification requirements. The general water consumption point is 5M head, and the minimum pressure of toilet flushing valve is 10M head.

3. For the centralized sanitary hot water system in the building, the hot water pipeline should have a slope and an exhaust valve at the end.

4. The centralized sanitary hot water system in the building needs to be equipped with heat storage equipment and expansion water tank according to the specification requirements. Circulating pipes and circulating pumps of hot water system should be set, and the circulating pipes of hot water system should be arranged in the same program according to the requirements of specifications.

5. For buildings without negative pressure water supply, the water pump directly sucks water from the municipal water supply pipe network, and the anti-reflux device should be set on the suction pipe.

6. The swimming pool should indirectly supplement the balance pool or water tank.

7. When there is no centralized hot water supply in the bathroom in the building, use the local electric water heater, and the bathtub is of little use (insufficient hot water). It is suggested to negotiate with the owner and the building profession to change the bathtub into a shower.

8. In the hot water system, it is not advisable to set a water meter for each layer of hot water main pipe, because the circulating backwater cannot be accurately measured. At the same time, a water meter can be set on the backwater main pipe to measure the hot water consumption through the water consumption difference.

9, high-rise building direct drinking water system, using partition water supply. The return pipe of the upper zone system and the lower zone system are connected in series, and it is not appropriate to return to the original water tank after passing through the pressure reducing valve. Because the pressure after the pressure reducing valve cannot be adjusted to be exactly the same. When the pressure behind one group of pressure reducing valves is greater than the pressure behind another group of pressure reducing valves, the smaller group of pressure reducing valves will be closed and its system cannot be circulated. The two systems need to be equipped with return pipe to the raw water tank respectively, and equipped with electric valves and flow limiting valves to control the circulation time and flow.

10, the water supply system uses a pressure reducing valve to supply water after decompression, and the pressure reducing valve is not allowed to set a bypass pipe.

1 1, in the residential water supply system, when the pressure is greater than 0.35MPa, pressure relief facilities should be set in the household pipeline. (Mandatory)

12. It is not suitable to install water tanks on open-air roofs in Shandong. It is difficult to keep the water tank and pipeline warm and prevent freezing, so the water tank should be located in the water tank room.

13, the combination of fire water tank and domestic water tank is not suitable, which does not meet the requirements of preventing water pollution.

14. Water supply pipelines and fire-fighting pipelines crossing structural joints of buildings shall be equipped with devices for compensating expansion, contraction and shear deformation of pipelines according to the requirements of specifications.

15, domestic water supply equipment, its water output should be selected according to the design second flow.

16, domestic water tank and inlet and outlet pipes should not be arranged too close, which will cause short circuit of water flow. If it cannot be arranged diagonally, a diversion device should be installed in the water tank.

17. The solar hot water supply pipe should be discharged from the upper part of the hot water storage tank. When in use, hot water should be supplemented with cold water, and the stored hot water can only be used up if it is discharged from the upper part. Otherwise, after the cold water is replenished, the water supply pipe will discharge the cold water first.

18. Water meters and filters should be installed in the water supply main.

19. In the outdoor general plan, a valve should be set on the pipe section between two water inlets on the annular water supply pipeline to ensure that there is still water supply all the way during maintenance.

20. The domestic water tank needs to be cleaned regularly and divided into two independent compartments, so that the water supply system can still work when cleaning the water tank.

2 1, toilet water distribution pipe, when there are less than or equal to 6 showers, the pressure drop per meter is not more than 300Pa, and when there are more than 6 showers, the pressure drop per meter is not more than 350Pa.

22, all kinds of pipes to avoid fire shutter position. Because the fire shutter needs to be sealed to the bottom of the beam, special treatment should be done when there is a pipe passing through it.

23. The centralized hot water supply system in the bathroom should be equipped with hot water return pipe and circulating pump according to the requirements of the specification.

24, sanitary hot water system shall not adopt the way of main decompression water supply, main decompression will make the system unable to circulate, if the return pipe in the upper and lower areas are connected again, it will lead to an increase in the system pressure of hot water in the upper area, and the water supply in the lower area will be backpressure by return pipe.

25, municipal steam condensate as swimming pool water is not appropriate. According to the specification, the supplementary water of swimming pool should meet the requirements of Hygienic Standard for Drinking Water, but the water quality of steam condensate is unmeasurable and uncontrollable.

Second, the drainage system

1, fecal sewage collection pool, should be designed as a sealed type according to the requirements of the specification, and equipped with an exhaust pipe.

2. The vent pipes of sump and drainage pipeline should not be connected to the exhaust shaft or air duct, but to the special vent pipe.

3. When the outdoor drainage pipeline and horizontal drainage main pipe are too long, inspection ports shall be set according to the requirements of specifications.

4, sewage pump selection flow is too large, need to choose according to the drainage design flow per second.

5, the lower part of the high-rise building has a separate drainage pipe, need ventilation pipe, can be connected to the main ventilation riser nearby.

6. Seamless steel pipes should not be used for building rainwater drainage pipes, and pipes with strong corrosion resistance should be used.

7. When using plastic drainage pipes in high-rise buildings, it is necessary to explain the requirements for setting fire-retardant devices.

8, fire elevator bottom drainage facilities should be set according to the specification requirements.

9, fire pump room, spray alarm valve, need to set up drainage facilities.

10, the layout of the drainage pipe should not pass through the structural joint.

1 1. The joint where the bathroom plane passes through the building structure is improperly arranged. It is suggested to negotiate with the architectural profession to adjust the layout of the bathroom.

12. The statement that "indoor rainwater risers and suspension pipes are made of pipes and connected in the same way as the drainage system" is incorrect in the construction instructions. The rainwater system of high-rise buildings needs to be tested with full water, and pressure-bearing pipes should be used.

13. In the high-rise drainage system, although the secondary flow of domestic drainage does not reach the maximum capacity of the riser, when the building has more than ten floors, special ventilation pipes should be set up to reduce the diameter of the main drainage riser, reduce the sound, improve the water capacity of the system and improve the ventilation conditions of the drainage system.

14. No room with special requirements for production technology or hygiene shall be arranged in the lower room of the bathroom.

15. Leisure tea rooms, coffee bars and other places in the building should be equipped with service rooms and cleaning rooms, and equipped with water supply and drainage facilities.

16, the basement pressure drainage pipe adopts seamless steel pipe, and the welding connection is inappropriate, so the pipe with good corrosion resistance should be adopted.

17. The horizontal sewage branch pipes connecting more than 6 urinals shall be provided with annular ventilation pipes according to the requirements of specifications.

18, drainage facilities should be set up for underground lighting window wells.

19, ventilation pipe adopts ventilation cap with side wall out of the room. The distance from the door and window should meet the requirements of the specification, which is more than 4m.

20, building balcony rainwater pipes need indirect drainage.

2 1, the pressure drainage pipe for fecal sewage in the basement should be discharged separately and not merged with other pressure drainage pipes.

22. It is not appropriate to mark "ventilation shaft inserted into exhaust system" on the ventilation pipe of sewage storage pit in basement. Because the exhaust system does not work 24 hours a day, when the exhaust system does not work, harmful gases will gather in the air shaft and be introduced into other rooms through the air duct.

23. The drainage pump under the fire elevator should not share the outlet pipe with other drainage pumps (because the drainage pump under the fire elevator has not been used for many years, and the water in the pipeline is not suitable).

24. The sump at the lower part of the fire elevator should not be used as the ground drainage sump of the underground garage. Because the flow requirements of fire-fighting drainage pump and ground drainage pump are quite different, it is uneconomical to operate at ordinary times, and the sump is connected with the elevator shaft, and the smell will be transmitted to the elevator shaft. The ground drainage of the garage should be provided with a sump with oil separation measures.

Third, the fire protection system

1. According to document No.20 of the Ministry of Public Security in 2007, "the power distribution room in high-rise buildings is an important equipment room, and a gas fire extinguishing system should be set up".

2. The working pressure of water distribution pipeline of automatic sprinkler system should not be greater than 1.2MPa.

3. The part above the building lobby belongs to the first floor fire protection zone, and the spray pipes need to be connected through the first floor system water flow indicator.

4. The air-conditioning machine room and warehouse of high-rise buildings should be equipped with nozzles according to the specification requirements. (A class of high-rise buildings and a class of high-rise buildings have different requirements for setting parts. )

5. A separate valve should be set on the ring pipe of the indoor fire hydrant system to ensure that there is no more than one closed supervisor when overhauling any pipe section.

6, the underground garage entrance ramp, when the building is not equipped with fire shutter, need to decorate sprinkler according to the specification requirements.

7. A separate valve should be set on the annular suction pipe of the fire pump to ensure that the fire pump can still be used during the maintenance of any section. When two fire pools are set, and each fire pump absorbs water independently, attention should be paid to the staggered arrangement of the main pump and the standby pump to ensure that the two fire pools can be used separately.

8. Each fire pump shall be equipped with a DN70 test valve (the test tube shall be connected back to the pool).

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