What is Trap And Their Location and Function

What is Trap

A trap is a sanitary fitting provided at the end of a soil pipe or waste pipe to prevent the passage of foul gases through it. The efficiency and effectiveness of a trap depend upon the depth of the water seal maintained by the trap. This water seal generally varies from 25 mm to 75 mm.

Types of Pipes | Classification of ...
Types of Pipes | Classification of Pipes (PDF)

Function Of Trap

In a drainage system, the function of a trap is to prevent the passage of foul gases through it. But at the same time, it allows the sewage to flow through it. Thus, the installation of a trap avoids nuisance.

Location Of Trap

The trap is located in the following manner:

1) Location of Gully Trap

This trap is provided at the junction of a room or roof drain and the other drain coming from bathrooms, kitchens etc.

2) Location of Floor Trap

This trap is generally placed in the floor of rooms,  kitchens, sinks, bathrooms etc to admit waste water into the waste pipe.

3) Location of Intercepting Trap

An intercepting trap is often provided at the junction of a house sewer and a municipal sewer.

4) Location of Master Trap

This trap is provided at the water closet.

Read Also:

Classification Of Trap According To Shape and Use

Types of Sewer Pipe Joints