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.
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.