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Check valve on fuel return line - NFPA 20
- Thread starter Piper888
- Start date
Doug Hunter
Automotive
I would guess that the engine manufacturers contributing to NFPA 20 could not agree on the specific content, and wanted to preserve their own individual design freedom.
LittleInch
Petroleum
There is a dedicated NFPA forum which might know more. And do a search in that forum.
- Thread starter
- #4
I'll check it out, thank you.
georgeverghese
Chemical
See if this helps :
www.linkedin.com
My guess is this check valve requirement on "fuel supply pressure recycle return line to fuel tank" is valid only when BOTH of the following are applicable
a)the return line enters the fuel tank below the max permitted normal diesel fuel level in the tank
b)the fuel tank max liquid level is above the elevation of the fuel supply return line at the point where it enters the diesel engine
Clarke (John Deere) JX Engines - Diesel Fuel Leaking Into The Oil
This popped up on radar this morning. The above capture from this DISCUSSION is one example where several conditions can cause this.
www.linkedin.com
My guess is this check valve requirement on "fuel supply pressure recycle return line to fuel tank" is valid only when BOTH of the following are applicable
a)the return line enters the fuel tank below the max permitted normal diesel fuel level in the tank
b)the fuel tank max liquid level is above the elevation of the fuel supply return line at the point where it enters the diesel engine
Last edited:
TugboatEng
Marine/Ocean
One supplier of ours that uses John Deere engines has strict back pressure limits on the fuel returns. We have to run checks because we have multiple engines sharing common returns.
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