Traps - Types and Uses

 
A trap is a device which is used to prevent sewer gases from entering the buildings. The traps are located below or within a plumbing fixture and retains small amount of water. The retaining water creates a water seal which stops foul gases going back to the building from drain pipes. Therefore all plumbing fixtures such as sinks, washbasins, bathtubs and toilets etc. are equipped with traps. This article tells you the features of traps, various types of traps and water seal.   


A trap has following features.

  • It may be manufactured as an integral trap with the appliance as in some models of European WC, or it may be a separate fitting called an attached trap, which is connected to waste or foul water outlet of appliances. 


  •  
  • The traps should be of a self-cleansing pattern.
  • Traps for use in domestic waste should be convenient for cleaning.
  • A good trap should maintain an efficient water seal under all conditions of flow. 

Various Types of Traps

1. Gully Trap:

These traps are constructed outside the building to carry waste water discharge from washbasin, sinks, bathroom etc. and are connected to the nearest building drain/sewer so that foul gases from sewer do not come to the house. These are deep seal traps, the depth of water seal should be 50 mm minimum. It also prevents the entry of cockroach and other insects from sewer line to waste pipes carrying waste water.

Plumbing trap

(Gully Trap)

2. P. Trap:

This trap is used with Indian water closet (ORISSA Pattern). The traps are made from cast iron or UPV sheet. This trap also has water seal and prevents entry of foul gases to the house.  

Drain traps

(P Trap)

3. S. Trap:

This trap is similar to P. trap and is used for fixing water closets in toilets. The only difference between P trap and S trap is that P. trap is used for outlet through the wall whereas S. trap is used for outlet through the floor.

plumbing trap

 Drainage trap(S Trap)

4. Floor Trap or Nahini Trap:

This trap is provided in the floor to collect waste water from washbasin, shower, sink and bathroom etc. These are available in cast iron or UPVC material and have removable grating (JALI) on the top of the trap. The minimum depth of water seal should be 50 mm.

5. Intercepting Trap:

this trap is provided at the last main hole of building sewerage to prevent entry of foul gases from public sewer to building sewer. It has a deep-water seal of 100 mm.

6. Grease Trap:

this trap is a device to collect the grease contents of waste and can be cleaned from the surface. This is generally used in food processing unit.

Drainage traps

(This picture is contributed by"S.Krishnan")

7. Bottle Trap:

This trap is used below washbasin and sinks to prevent entry of foul gases.

 

plumbing bottle trap



(This picture is contributed by "S.Krishnan")


8. Q Trap:

This trap is used in toilet under water closet. It is almost similar to S trap and is used in upper storey other than ground floor.

Water Seal

Water seal in a trap is the depth of water which should be removed from a fully charge trap before gases at atmospheric pressure may pass from the waste pipe through trap into a building. The tape is useless unless they retain their seals at all times. The seal may be broken due to air compressor, momentum and evaporation. The trap in fittings in range is liable to siphonic action and each trap should be ventilated.

 

 

water seal in trap

(This Picture is contributed by "S.Krishnan")


The depth of water seal in various sanitary appliances is given below.

• Water closet 50 mm
• Floor trap 50 mm

Other fixtures are directly connected to the stack through branch waste pipe of diameter = 75 mm and 40 mm

• Hand-pour flushed type 20 mm

 
30  Comment(s)
Anonymous
By Anonymous - On 12/9/2014 3:28:21 PM
it ws realy helpful...tenkeww
 
Anonymous
By Anonymous - On 5/30/2014 7:46:29 PM
Article on traps was very helpful. Thank you.
 
Anonymous
By Anonymous - On 9/3/2013 3:36:14 PM
this article is very useful for new building construction.
 
Anonymous
By Anonymous - On 5/15/2013 1:47:29 PM
i want all plumbing connections with technical drawings
 
Anonymous
By Anonymous - On 5/13/2013 12:51:08 PM
u didnt explained about the d-trap and anti D-trtap
 
Anonymous
By Anonymous - On 9/28/2012 1:15:22 PM
Learned alot frm this article.
 
S L Gupta (Civil Engg)
By S L Gupta (Civil Engg) -  On  7/4/2011 1:03:14 PM

Dear Shams


        In a two pipe system, the waste pipe carrying discharge from the wash basin, sinks bath etc is connected to the sewer through gully trap so that foul gas from the sewer do not find an entry  in to the house. It is deep seal trap provided on the external face of bath room and kitchen wall.It also prevents the ingress of the coacroaches and insects from the sewer line in to the waste pipe system carrying sullage.

 
SHAMS
By SHAMS -  On  7/3/2011 1:35:26 AM
1) All plumbing fixtures such as wash basin, bath tubs etc. have their own p traps, so why is it necessary to provide a gully trap outside the house before final connection of the waste with the sewage manhole?
2) Must a vent be provided downstream of the gully to prevent the seal of the gully itself?
 
Anonymous
By Anonymous - On 3/25/2011 11:03:12 AM
really i liked this article which gave me breif information about traps
 
Anonymous
By Anonymous - On 12/7/2010 9:13:42 AM
Hi. Could you tell me what is the different between floor waste, floor trap & floor drain ? Catalogs for these product.
 
Anonymous
By Anonymous - On 11/11/2010 1:48:17 PM
a major problem is short out by this article
bharat nagar
 
Anonymous
By Anonymous - On 10/28/2010 2:59:18 PM
shallow floor trap can any one give me image and dimension of a shallow floor trap thank you...
 
Anonymous
By Anonymous - On 9/20/2010 3:05:02 PM
Really helpful. But, better with more information or description.
 
shailesh sharma
By shailesh sharma -  On  8/24/2010 12:50:37 PM
this artical was realy helpful... thanks lot for such brilliant information
 
Anonymous
By Anonymous - On 8/24/2010 12:21:39 PM
this artical was realy helpful for my coursework thanks lot for such brilliant information
 
Anonymous
By Anonymous - On 8/19/2010 3:06:48 PM
Very nice topic and very informative. Thank you.
 
Anonymous
By Anonymous - On 8/12/2010 11:48:00 AM
Very good explanation and found very informative
 
Anonymous
By Anonymous - On 8/5/2010 8:14:32 AM
thank u i made my submission........:-)
 
ALOK
By ALOK -  On  7/28/2010 5:15:23 AM
GOOD
 
Anonymous
By Anonymous - On 7/14/2010 6:17:51 PM
excellent information provided to the point!
 
Anonymous
By Anonymous - On 6/13/2010 5:40:25 PM
this artical was realy help for my coursework thanks lot
 
Anonymous
By Anonymous - On 6/11/2010 10:59:32 AM
its very good information.
 
Anonymous
By Anonymous - On 5/29/2010 10:02:07 AM
very good information
 
Anonymous
By Anonymous - On 4/14/2010 2:29:41 PM
good iformation
 
Anonymous
By Anonymous - On 3/5/2010 5:26:37 PM
This information is very very very good!!! thanks alot!!
 
Anonymous
By Anonymous - On 12/29/2009 11:05:07 AM
hey this article is very informative...thank it helped me a lot for my end semester exam.......
 
shivakumar
By shivakumar -  On  10/21/2009 4:42:45 PM
good
 
Anonymous
By Anonymous - On 9/3/2009 6:30:52 PM
Yeah i didnt know what a gully trap or a q trap was. Thanks.
 
Anonymous
By Anonymous - On 7/11/2009 10:08:24 AM
Thank you for a wonderfully clear and concise explanation - I have been looking everywhere for this explanation - 5 stars!
 
Anonymous
By Anonymous - On 6/29/2009 8:22:27 PM
it was very helpful..but i think more elaboration with diagrams and figures would have made it more useful
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