Blue Bird TC/2000, Руководство пользователя

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From the valve fuel flows into a common fuel line through high pressure stainless steel compression
fittings. The tanks are joined to the common line through high pressure stainless steel tee's and crosses. Any
open tank thus communicates to any other open tank. So for fueling, the fuel is backfed through the common
line to all tanks (with open valves) simultaneously. The tank shutoff valves only isolate the interior of the
tanks: The tee's on the valves still have the high line pressure.
Do not uncouple fittings until all tanks are closed and pressure has been purged from the line.
The lines are high pressure rated 3/8 stainless steel seamless tubing which carries the fuel to the high
pressure regulator.
In refilling, the fuel enters the fill valve on the entrance side of the bus and then flows through a check
valve into the common tubing before reaching the tanks.
From the high pressure regulator, the fuel flows to the shutoff solenoid. The shutoff solenoid is activated
by the ignition switch, engine operation, and the fire suppression system. The loss of any of these will shut
off fuel supply to the low pressure regulator (LPR).
The dashboard fuel gauge is proportional to the pressure when corrected to 70 degrees Fahrenheit.
NOTE: Fuel level is only accurate for the tanks that are open.
SAFETY CAUTIONS & WARNINGS
Both gasoline and CNG are volatile flammable fuels that are safe to work around when necessary precau-
tions are taken. As on a gasoline fueled system, carelessness with CNG can lead to a fire or explosion when a
leak occurs. CNG will not pool and spread like gasoline. It has a narrower range of flammability than
gasoline as well as a higher ignition temperature. Despite these relative safety advantages, fire potential does
exist. CNG is lighter than air, therefore, it can collect in the higher regions of a room and possibly go undetec-
ted, creating fire potential.
Since the fuel system is a very high pressure system employing a flammable gas, all safety issues nor-
mally considered in these situations should be applied. Some of the more obvious precautions are listed
below. This list is not necessarily intended to be complete, and responsibility for assuring full safety is that of
the person(s) doing the work or operating the system.
WARNING: Storage tanks must be tested according to specified procedures at required dates. Failure to
do so relieves the manufacturer of all responsibility and is a violation of federal law. See manufacturer's
label.
CAUTION: In the event of an accident, all tanks, lines and fittings should be thoroughly checked by
qualified personnel before the vehicle is used again.
NOTE: All valves are closed when turned fully clockwise viewed from the top of the valve handle, and open
when turned counterclockwise viewed from the top of the valve handle.
CAUTION: Always provide good ventilation, including near roofs and ceiling.
CAUTION: Do not work in a noisy environment, the sound of leaking gas may go undetected.
WARNING: Never attempt to find a leak with your hands. A large leak can freeze burn the skin.
WARNING: Never place hands or any other part of the body on a leak.
IMPORTANT: Always have rated fire extinguishers on hand and automatic fire suppression equipment.
CAUTION: Avoid heat near pressure relief valves; the manufacturer's rating is 212 degrees Fahrenheit for
the relief valve. Should it vent, the entire area will be filled with natural gas.