|
| |
4-16 Fuel Transfers - Cont'd.
The rate of discharge through the dispensing assembly is variable depending on the number and type of vehicles or
containers being filled. Pump discharge rates and pressures are therefore variable. It is recommended that pressures be
kept as low as possible and yet maintain desired loading rates This is a matter of safety to reduce the potential of hose
whip, splash back and spills Experience will be the most reliable guide for dispensing set and feed pump operations.
There must be good communications between the dispensing set operating supervisor and the pump operator. The
situation at the dispensing set must govern pump operation. Due to the pressure rating of certain dispensing set fittings,
the feed pump discharge pressure should not exceed 75 psig. For safety reasons, the pressure at the 1-inch dispensing
nozzles must be kept low-in the order of 10-20 psig. When loading tanker-trucks only, it is recommended that the feed
pump be operated initially at less than 35 psig. Pressures can then be raised or lowered in increments of 5 psi until a
desired loading rate is established. Flow rates can be determined by observation of the meter readings over a known
period of time. When using only the 1 -inch and 11/2-inch nozzles, it is recommended that the pump be operated in the
manual mode beginning at idle and increasing speed in increments of 50 RPM until a desired loading rate is achieved but
not exceeding 1000 RPM. If it is necessary to dispense through the 1-inch and 1112-inch nozzles while loading tanker-
trucks, this can be done if handled with care. The valves V60J and V61J can be partially dosed as necessary to cause
additional pressure drop before the 1-inch and 1-1/2-inch loading spots. When no fuel is being dispensed, the feed pump
must be shut down immediately. To supply fuel to the dispensing assembly from tanks TSJ or T6J, either pump P3J or
P4J may be used. This operating instruction describes the use of pump P3J to discharge fuel from tank T5J through the
dispensing set.
1.
Open valves V40J, V41J, V42J, V43J, V44J, V45J, V54J, V55J, V56J, V59J. Open V60J and V61J only if the 1-
inch or 1-1/2-inch loading nozzles downstream are to be used.
2.
Connect the dispensing coupling (or couplings) to the tanker truck being loaded.
3.
Start pump P3J and hold at a very low discharge pressure or in the idle position.
Note the recommendations in the opening paragraph.
4.
Open the valves leading to the appropriate dispensing hose coupling or couplings in use.
5.
Raise P3J discharge pressure to that required for the dispensing assembly loading rate desired. Adjust pressure
to compensate for major changes in the dispensing assembly loading rate.
6.
If filling user vehicles the dispensing nozzles V66a-fJ are used at the will of the refueling operator after opening
V60J and V61J.
7.
When loading is complete, close the valve nearest the coupling. Disconnect the coupling.
8.
When any particular dispensing line is not going to be in service for any extended period that the block valves
V62a-fJ and V64a,bJ be left closed.
9.
The above instructions pass fuel through the filter separator FS1 1J. If FS2J is to be in service in lieu of FS1J,
open valves V57J and V58J. Close V55J and V561. If for some reason it is desired to have both filter separators in
service, leave V55J, V56J, VS7J and V58J open. If loading rates are to exceed 350 gpm, both filter separators should
be in service.
4-38
|
