Go Back   Team-BHP > BHP India > Commercial Vehicles


Reply
 
Thread Tools Search this Thread
Old 28th June 2006, 11:42   #1
BHPian
 
Revvhead's Avatar
 
Join Date: Apr 2005
Location: Bombay
Posts: 450
Thanked: 9 Times
Default Whats This- Pipes on a BEST bus??

Ok, i have noticed that all the CNG BEST buses in bombay have two pipes sticking out of the rear capped with a T. Also has a rubber gland between the pipe and the sheel, so this is definitely an intentional design fit.
The end of the T has a mest siliar to a flame arrestor type mest- but the mesh size seesm to be a bit too large for the purpose of a flame arrestor.

My guess is that it may be part of the safety relief valve system on the CNG cylinders.



I could only snap one (was driving
) but they are always in pairs, side by side. Courtesy the Cab that decided to stop right up to the bus (typical) i could get a full pic of both

any one to shed any ideas on this?
Revvhead is offline   Reply With Quote
Old 28th June 2006, 12:06   #2
Senior - BHPian
 
normally_crazy's Avatar
 
Join Date: Feb 2004
Location: Mumbai
Posts: 4,367
Thanked: 387 Times
Default

could be the CNG filling inlet ?
normally_crazy is offline   Reply With Quote
Old 28th June 2006, 14:57   #3
BHPian
 
Revvhead's Avatar
 
Join Date: Apr 2005
Location: Bombay
Posts: 450
Thanked: 9 Times
Default

Nope no change of that.
There's no evidence of any pressure cap/ quick connect coupling or any high pressure system there.
As i said, the ends have wire mesh on them

I dunno how CNG in cars is filled myself, but am dead sure from the construction its not a filling pipe- that stuff looks like ordinary pipe- altho, if one were to use it as a relief line i figure cryogenice pipes would be neccessary if you construct it properly
Revvhead is offline   Reply With Quote
Old 28th June 2006, 15:48   #4
BHPian
 
naveendhyani's Avatar
 
Join Date: Feb 2006
Location: Melbourne
Posts: 542
Thanked: 7 Times
Default

in delhi also the CNG vehicles have these pipes although they run all the way till the top of the bus. i guess it cud b some leakage preventive measure, though not sure.
naveendhyani is offline   Reply With Quote
Old 28th June 2006, 16:06   #5
BHPian
 
sumitkalindi's Avatar
 
Join Date: May 2006
Location: Kolkata
Posts: 374
Thanked: 13 Times
Default

Yes it is a release pipe to offload CNG from the tanks incase of some mishap
sumitkalindi is offline   Reply With Quote
Old 28th June 2006, 20:41   #6
BHPian
 
Join Date: Jul 2005
Location: mumbai
Posts: 732
Thanked: 60 Times
Default

i used to think it was for supporting the posters behind..
but i guess im wrong
team bhp...always helps
xtreme power is offline   Reply With Quote
Old 29th June 2006, 17:56   #7
BHPian
 
Join Date: Mar 2005
Location: Singapore
Posts: 262
Thanked: Once
Default

It is the CNG system's pressure relief valve outlet..
The T is so that it doesnt blow off the person/vehicle immediately behind.
The mesh may have a more common-place purpose, to prevent rats and birds getting in . A flame arrestor is a bit more elaborate than just a mesh.
Why in pairs - Maybe its a dual redundant system ie 2 PRVs or maybe there are 2 CNG tanks in these buses?
nitinbhag is offline   Reply With Quote
Old 29th June 2006, 18:13   #8
BHPian
 
Revvhead's Avatar
 
Join Date: Apr 2005
Location: Bombay
Posts: 450
Thanked: 9 Times
Default

True, but the mesh size is a little wide.
Believe me , in a relief system, a proper mesh is an excellent flame arrestor
and many times thats all there is.

The reason why it could be in pairs is possibly both of two reasons-
The primary one being the redundancy- In the event of malfunctioning/non lift of one relief valve the other will make sure that the pressure is relieved

and/Or

To ensure a sufficient rate and volume of release to prevent any pressure buildup in the line.
Revvhead is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Whats double clutching & whats the reason to use it _Crazi4Speed_ Technical Stuff 109 25th February 2016 08:49
Loud Pipes face the Axe manson Superbikes & Imports 42 28th April 2013 09:03
Advantage or Disadvantage of Twin Tail Pipes Ricky_63 Technical Stuff 15 9th June 2007 12:40
Whats the fastest i.e whats the highest average speeds that you have maintained MKRAFT Street Experiences 1 3rd April 2006 17:25


All times are GMT +5.5. The time now is 06:40.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks