6 Types of Trap Classification According To Shape and Use || Building Drainage - Civil Engineering

Saturday, 30 June 2018

6 Types of Trap Classification According To Shape and Use || Building Drainage

6 Types of Trap Classification According To Shape and Use

The trap is classified in the following two ways-
According to shape:- a) P-trap, b) Q-trap, c) S-trap
According to use:-  a)Floor trap, b)Gully trap, c)Intercepting trap
According to the shape and size trap are classified into 6 types, which are described below

1) According to shape

According to shape trap are three types, They are described below

a) P-trap

This trap has the shape of letter P. The legs of the trap are at right angles to each other. It essentially consists of a U-tube which retains water acting as a seal between the foul gas and atmosphere.

b) Q-trap

This trap has the shape of the letter Q. The legs of the trap meet at an angle other than a right angle. It essentially consists of a U-tube which retains water acting as a seal between the foul gas and atmosphere.

c) S-trap

This trap has the shape of letter S. The legs of the trap are parallel. It essentially consists of a U-tube which retains water acting as a seal between the foul gas and atmosphere.

Types of Trap Classification According To Shape
Types of Trap Classification According To Shape

2) According to Use

According to use trap are three types, They are described below

a) Floor Trap

A floor trap is generally made of cast iron. This trap is generally placed in the floor of rooms, kitchens, sinks, bathrooms, etc to admit wastewater into the waste pipe.

A cover with grating is provided at its top to prevent the entry of solid matters. The cover can be removed for cleaning of the trap this trap is also known as nahni trap.

b) Gully Trap

A gully trap is generally made of stoneware. A cast iron grating is provided at its top to prevent the entry of coarser materials. The cover can be removed for cleaning of the trap. 

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

c) Intercepting trap

An intercepting trap is often provided at the junction of a house sewer and municipal sewer. This trap prevents the entry of foul gases from the municipal sewer into the house sewer.

This trap is often provided in a small manhole. it also contains an inspection arm for the purpose of cleaning and inspection. This trap is also known as an interceptor or disconnecting trap.
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