Parr Instrument 1356 - Manual (Page 20)

20
Oxygen Use
P1A Oxygen Cylinder volume of cylinder 43.8 liters pressure of cylinder 2490 psi
V x P = 109062 liters-psi
Amount of gas per test = .350 liters x 450 psi = 158 psi-liter
No. of tests = 109062 psi-liter/158 psi-liter= 700 tests per cylinder
Spiking Volatile Waste Samples
Determine the heating value of mineral oil based on a minimum of 6 combustion tests.
Store this value in menu page 2.3 line 2. Go to menu page 2.3 and turn on line 1. Entered
value must be in cal/g and typical value is 11000 cal/g.
Cut a square portion from the 517A tape, which is chlorine free and apply to the fuel
capsule. Trim to the circumference of the capsule leaving one tab to fold back so that
material can be added to the capsule. The amount of tape used for covering the capsule
will be .0502 gm +/- .002 g. The tape will have a heat of combustion value of
approximately 6300 cal/g, and correction for the tape would be 316 calories +/- 12.6
calories. If this variation is insignificant relative to your application, then you might add
this value to fixed fuse correction and enter the sum on menu page 5 line 4, and turn on
fixed fuse..
If this value is significant, you might consider adding your fuse and acid correction and
entering the total for a fuse correction. Then one can use the nitric acid entry as means for
correcting for the tape. Menu page 5 line 5 should be off. Take the heat value of the tape
divided by 14.1 and multiply the result by the weight of the tape and enter this value on
Menu page 5 line 5. This assumes that a fixed value is used for the sulfur correction is
turned on. When requesting a report, the system will prompt for the nitric acid value. The
entry will be the weight of the tape.
Recommended procedure for all waste samples would be:
1.
Cut, add tape to crucible, trim and leave tab to fold back.
2. Add .45 g of mineral oil
3. Add .1 g of sample
4. Seal capsule, load into bomb, and proceed as normal
Acid Sulfuric Calculations
The factor used to convert percent sulfur concentration to calorie correction in the heat of
combustion calculation for liquid hydrocarbon fuels is different than the factor for solid
fuels. The following table lists the differences between fuels.