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|28th June 2006, 11:42||#1|
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?
|28th June 2006, 14:57||#3|
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
|28th June 2006, 15:48||#4|
Join Date: Feb 2006
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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.
|29th June 2006, 17:56||#7|
Join Date: Mar 2005
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?
|29th June 2006, 18:13||#8|
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
To ensure a sufficient rate and volume of release to prevent any pressure buildup in the line.
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