Saturday, 30 June 2018

Classification Of Trap According To Shape and Use ||wastewater engineering-drainage||

Types Of Trap:-

                    The trap are 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

1)According to shape

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


2)According to Use

a)Floor trap:-

                 A floor trap is generally made of cast iron. These trap are generally placed in the floor of rooms,kitchens,sinks,bathrooms,etc to admit waste water 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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