What is the indirect drainage of air gap and drain pipe?

The reserved air gap refers to the vertical space distance between the lowest point of pipe outlet or water nozzle and the overflow water level of water equipment in the water supply system; In the drainage system, it refers to the vertical space distance between the lowest point of the discharge nozzle of indirect drainage equipment or container and the overflow water level of the receiver.

The main differences between indirect drainage and direct drainage are as follows:

First, the way is different

1. Indirect drainage: the drainage pipeline of equipment or container is not directly connected with the drainage system, and there is an air gap between them.

2. Direct drainage: mine water is directly drained from the ground by drainage equipment at one time.

Second, the role is different.

1. Indirect drainage: used to prevent backflow pollution, usually in overflow pipes or exhaust pipes.

2. Direct drainage: as long as it is possible to install suitable pumps and pipes, use them as much as possible.

Third, the characteristics are different.

1. Indirect drainage: Some places cannot be directly connected with the drainage system, such as the drainage of the roof sentry box.

2. Direct drainage: drainage equipment can be set at one level or several levels (multiple levels).

Baidu encyclopedia-direct drainage

Baidu encyclopedia-indirect waste water pipe

Baidu encyclopedia-air gap