Some basic knowledge of drainage pipes and drainage systems


The water source enters thousands of households, and th […]

The water source enters thousands of households, and the residual water after people use it must be discharged. This is the importance of PPR pipe fittings, where they come into play. The water pipes and drainage systems of most houses use the same basic principle: there is usually a main water supply line around the foundation of the house. From this point of view, it has been delivered to the water heater. The water heater produces hot water for the entire house. The hot water pipeline runs through the whole house from the water heater to supply water for each demand point.


Most people do not notice how the house drainage system works. Suppose that when they put water from the sink or flush the toilet, the water disappears. It is normal to a certain extent, and a little more is involved in the process of discharging wastewater from houses. Each faucet area has its own drain; each drain is connected to a larger supervisor, which takes the water out of the house.


People living in cities and suburbs draw water from municipalities, and people usually drain wastewater into sewer systems. Septic tanks usually need to be pumped out every 10 years or so to prevent backup. If they are not pumped out, the drainage system of the house will be blocked.


Most people think that the most important part of the drain is the trap. They are called traps because they do this: they collect water inside and prevent the sewer gas from re-entering the house.


Several PVC pipe fittings are required to connect the trap. The first is the nut, which connects the two parts together with a threaded fitting. The ferrule forms a seal. Just tighten the nut on the ferrule to form a waterproof seal.


Ventilation holes are the main component of the home drainage system. The vent hole makes it easy for water to flow out of the drain pipe. Many high-rise buildings are ventilated through the roof. The ventilation pipe is fixed in place by the concrete roof waterproof board.


Each drainage pipe, whether underground or wall-mounted, must have a certain inclination and be properly inclined so that the wastewater flowing out of the house can be drained. Ensure that the water can be drained normally; it will not flow backwards in the pipeline. A rule of thumb to be followed when installing the pipeline is to drop 30mm per foot.


Underground pipeline systems are usually pre-buried underground for municipal services, intricate water supply and drainage pipelines, the conventional size of water supply is pipelines with a diameter of more than 110, and other water supply services have larger pipeline sizes, large diameter oil supply pipelines and various Plant sewers, chemicals, petrochemicals, etc. The term "underground" applies to pipes-buried underground or in trenches. The underground system consists of a gravity flow drainage system that carries industrial waste, renewable hydrocarbons, rainwater, fire fighting water, and drinking water systems.

The following are common underground pipe network services that live in industry.

– Water supply pipeline

– Fire water

– Rainwater pipes

– Oily sewer

– Liquid wastewater from wastewater treatment plant

– Domestic sewage system

– Equipment drainage of sewage tank

– Cable duct

– Communication cable duct

Types of underground pipes

According to the service and the medium handled by each system, different systems are defined in the system. We will introduce the urban public system and sewer system one by one.


1.Water supply system

This is usually a buried system with a protective coating and coating (eg HDPE pipe, ductile steel pipe).

The valves used for part of the water supply system are enclosed in the valve pit. The compacted soil layer is 1200 mm above the top of the pipeline. The soil layer (backfill) on the pipeline is compacted to a strength index of at least 95% to protect the pipeline from damage by ground loads.


2. Contaminated rainwater pipeline

The system collects surface drainage. This water must pass through treatment facilities before being discharged into uncontaminated systems or natural water bodies (such as rivers or streams).


3. Closed life sewage sewer

The system collects the drainage pipes around life and operates as an independent system. The system should be designed according to P & ID, and the waste water collected from the equipment through the discharge point and underground piping system is connected to the underground well.


4. Amine sewage sewer

The amine blowdown system should be designed according to P & ID.

Waste water should be collected from the equipment through points above the ground into a closed funnel connected to the underground system. The main header is connected to the underground well.


5. Fire water system

The system consists of a fire hydrant network surrounding the equipment, with the branches required for fire hydrants or monitors to protect the area in the event of a fire.

This is a closed-loop system, starting from the fire water and pumps to the specific location of the fire hydrant to the monitor. It is initially maintained at a predetermined working pressure level.


6. Drinking water system

The water is used for drinking, all domestic water.


7. Sewage treatment system

The sewage treatment system collects waste from all toilet facilities provided in various factory and non-factory buildings and should be discharged into the sewage treatment plant,

Acids, caustic soda, hydrocarbons, rainwater or other chemical wastes must not be discharged into the system. The system usually flows through the septic tank.


8. Underground communication cable duct

Underground cable routes and communication cables are laid and constructed by various urban electricity bureaus and telecommunications departments. These wires, cables, and optical fibers are routed upward from the ground well to the terminal point, which greatly facilitates equipment maintenance.