According to the building water supply and drainage design code, where should the pipe backflow prev

Here are some of the well-known brands recognized in the backflow preventer industry that are widely recognized and have a great reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be among the top brands in the valve industry: Water System Valves and Industrial ValvesThe following more influential first-line brands can be used as a reference, but are for reference only:

Suzhou Neway Valve, Shanghai Qizhong Valve, Shanghai Guanlong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The layout and laying of the internal drainage pipes of the building should meet the requirements of smooth drainage, good hydraulic conditions, convenient maintenance, complete production and use, long service life, prevention of water quality and environmental pollution, economic and beautiful appearance.

Things to pay attention to in the internal drainage pipes:

Pipe installation: Internal dirt and debris must be removed before installation to prevent blockage.

2.Pipe frame production and installation: in strict accordance with the requirements of the construction drawings blanking, welding, after anti-rust treatment, installed on the load-bearing structure, the position should be correct, the burial is smooth and firm, and the pipeline contact is close.

3.Water supply and drainage pipeline installation: the water supply horizontal pipe should have a slope, and the slope drainage device: the diameter and minimum slope of the drainage pipe should be constructed in strict accordance with the design requirements.

4.Pipeline connection: The water supply pipeline is made of galvanized steel pipe and connected by thread connection; The indoor drainage pipe and the outlet pipe are made of drainage cast iron pipe and asbestos cement interface.

5.Anti-corrosion: surface-mounted galvanized steel pipe.

Summary. Pro, it is advisable to set up a separate waste pipe to discharge into the outdoor rainwater pipe of the building drainage category; 1. Waste water containing grease in the kitchens of staff canteens and business restaurants; 2 Car wash rinsing water; 3. Sewage from medical and scientific research institutions containing pathogenic bacteria, radioactive elements, etc. that exceed the discharge standards; 4. Boiler blowdown with a water temperature of more than 40; 5. Domestic drainage used as a source of reclaimed water.

Pro, it is advisable to set up a separate waste water family wide imitation pipe to discharge into the outdoor rainwater pipe building drainage category; 1. Waste water containing grease in the kitchen of staff canteens and business restaurants; 2 Car wash rinsing water; 3. Sewage from medical and scientific research institutions containing pathogenic bacteria, radioactive elements, etc. that exceed the discharge standards; 4. Boiler blowdown with a water temperature of more than 40; 5. Use ingenuity as the domestic drainage of the water source.

Pro, building water supply and drainage design standards; Fire drainage, living pool (box) drainage, swimming pool drainage, air conditioning condensation drainage, indoor liquid water feature drainage, garage without car wash and machine room ground drainage without machine repair should be separated from domestic wastewater, separate wastewater pipes are set up to discharge into outdoor rainwater pipes, and domestic wastewater should be diverted from burial, for underground bicycles, car garage sump drainage, it is understandable that it can also be combined with domestic wastewater (do certain measures), then once it merges with domestic wastewater, Jinshan can only discharge outdoor sewage pipes.

Answer]: According to the "Code for Design of Building Water Supply and Drainage", the plastic drainage pipe should be set up with an expansion joint according to the expansion amount of the pipeline, and the expansion joint should be set at the confluence fittings. The drainage horizontal pipe should be provided with a special expansion joint.

Note: When the drainage pipe is falsely judged to be leased with rubber sealing fittings, the expansion joint may not be provided; Indoor and outdoor buried pipelines can be washed out without expansion joints.

Answer]: B Increasing the return period can increase the safety factor of pipeline drainage. None of the ACD items can be done.

Yu Demo Answer]: c

According to Article 1 of the "Design Standards for Building Water Supply and Drainage" (GB 50015-2019), it is strictly forbidden for domestic drinking water pipes to be directly connected with toilets (slots) and urinals (slots) by non-special flushometers. The sprinkler head is an underground green sprinkler irrigation system, which is also prone to pollution due to the flooding of the sprinkler head.

Answer]: cThe knowledge points assessed in this question are the classification of building drainage systems. According to the nature of waste and sewage accepted by the system, the building drainage system can be divided into the following categories.

1) Domestic drainage system: exclude waste and sewage from residential buildings, public buildings and factories.

2) Industrial waste and sewage drainage system: eliminate waste and sewage generated in the production process.

3) Roof rainwater drainage system: collect and remove rainwater and ice and snow melt water from the roof cover.

The above systems can be set up separately, and waste and sewage with similar properties can be discharged together. In general, the roof rainwater system should be set separately.