Historical data.
This is the most accurate method if accurate
records were kept.
Review past production logs, and get an average
for fuel consumption in gallons per hour of continuous operation.
For example, over the past two days your daily fuel consumption was
20 gallons for 10 hours of operation.
This is broken down to 2
gallons per hour of operation. Divide the amount of fuel on hand (15
gallons) by the average per hour (2 gallons). This will give you 7.5
hours of operation, which is how long you can operate on 15 gallons
of fuel.
Equipment data. Every piece of equipment that consumes supplies
in order to operate will have a table that lists all the consumable
operating and maintenance supplies. This table is in the appropriate
technical manual for that equipment.
EXAMPLE: Use this example to determine how long we can operate on 25
gallons of fuel before we need to be refueled. The technical manual
for a 30-kw diesel engine is TM 5-6115-465-12. Appendix D lists all
consumable operating and maintenance supplies. It indicates that it
will consume an average of 1 gallon for 10 kilowatt hours of
operation.
The load capacity is 1,800 RPM equals 30 kw at 60 hz.
From this information, divide 30 kw by 10 kw; this equals 3 gallons
per hour of fuel consumption. Divide 25 gallons of fuel on hand by 3
gallons per hour.
This will give you about 8.3 hours of operation
for 25 gallons of fuel.
Chemical requirements are estimated in the same manner as those used
in estimating POL. Again, historical data are more accurate than the
equipment operating supplies table.
When you plan for consumable
supplies for the ROWPUs, you must use the historical data method.
However, if there is not any historical data, you must be able to
estimate chemical use from using the technical manual.
EXAMPLE: You are planning for water supply operations, and you have
determined that six 600-GPH ROWPUs will be needed to complete the
mission. You have just arrived at a new duty station and cannot find
any historical data.
Your supply of sodium hex is low.
You
determine how much sodium hex is needed for the operation as follows:
TM 5-4610-215-10 states that the chemical feed pump for sodium
hex is calibrated to 60 milliliters (ml) in 60 seconds.
60 ml per minute times 60 minutes equals 3,600 ml per hour.
3,600 ml per hour times 20 hours of operation equals 72,000 ml
per day.
QM4919
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