Document M4RoVN088XvKBBBo6vxnxk3EV
VINYL CHLORIDE (VCM) TANK CAR LOADING PROCEDURE
1. Close derails and set up blue flags. Set hand brakes and place wheel chocks in position.
2. Secure area against unauthorized personnel and all sources of ignition.
Check cars for the following:
a. Four placard holders. Insert 4 new placards < UN 1086)
b. Proper stenciling, i.e., DOT No., water capacity, VINYL CHLORIDE in four inch letters, "Vinyl-cancer suspect" statement on dome.
c. Test dates and test location for tank and safety relief valve must be on car. Tank test interval is 10 years, safety relief valve interval is 5 years. Year tested and year due test should be stenciled on car .
EXAMPLE:
SRV TESTED - 1988 DUE - 1993 PPG L.C. LA TANK TESTED - 1988 DUE - 1998
3. Lower access ramp onto car. Attach two grounding cables, one connected from loading line to tank car dome and one connected from rack to tank car handrail. Check both ends of grounding cables with a continuity meter,
4. Check gauging device to insure it is operational.
Float Dev ice - Operate gauge rod until magnet in rod engages magnet in float. If rod and float magnets cannot be engaged or if float is stuck at top, notify Foreman.
5. Remove plugs from all valves and leave out during loading. Possible leak through on any of the car valve will trap VCM behind plug. Airline mask will be provided and used if necessary when removing plugs.
Install two 2" loading nipples, one in a liquid valve and one in the vapor valve.
6. Before removing plugs out of vapor and liquid hoses, pressurize hoses with nitrogen four times and blow down to VCM incinerator header. Make sure the equalizer and incinerator valves are closed on the rack.
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7. Connect the liquid loading hose to the liquid valve nipple. Close bleed valve on the nipple.
8. Connect the vapor line to the vapor valve nipple. Close the bleed valve on the nipple.
9. Open both liquid and vapor valves on the tank car. Note and record returned tank car pressure on Loading Form.
10.
Connect portable oxygen analyzer and analyze gas sample for oxygen content.
11.
If oxygen content is greater than 1,000 ppm the car must be pressurized to 50 PSIG with nitrogen, blown down to the VCM incinerator and recheck to make sure the vapor space contains less than 1,000 ppm oxygen. If test is good the car must be equalized to sphere while loading.
12.
If car is to be stabilized, phenol must be added to pipe connected to liquid valve on car prior to hooking up loading hose.
NOTE:
Foreman or Leadman will notify Tankerman if certain cars are to be stabilized.
Use caution when adding phenol. goggles and apron.
Wear glasses, gloves,
13.
When ready to load open suction line from sphere and Suction and discharge valves on pump. Make sure re-circulation line back to sphere being used for loading is open about one round. Close 1/2" valve on re-circu1 ation line at pumps.
Use caution during valves and packing loading.
line up leaks.
of sphere and pump. Look Correct all leaks before
for
1L.
Open loading valve and gravity feed car for a few minutes before starting loading pump.
a. Watch for leaking flanges, hammer unions, hoses, etc. Leaks must be corrected before loading starts.
b. Loading pumps must be started from the pump pad only. Pump seals and valve packing should be inspected frequently while loading is in progress.
15.
Consult applicable tank car outage table, at the appropriate temperature, for loading outage.
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16. When loading is completed:
a. Shut down loading Dump if no other car is to be loaded and close liquid loading valve on rack.
b. Sample vapor space in car as before for oxygen content, then close angle valve on car. If oxygen content is in spec (500 ppm), proceed to clear VCM from loading and vapor hoses.
c. If the oxygen content is not in spec <500 ppm), pressure car up to 50 psig of nitrogen and blowdown to VCM incinerator. Continue this step until the car is in spec, (500 ppm or lower).
d. With nitrogen, and using block and bleed system, force VCM from loading hose into car. The time required to do this without adding excess nitrogen to the car will have to be determined by experience, (approximately 3-4 times).
e. Close off liquid angle valve and vapor valve on the car. Connect the short purge hose between the liquid and vapor fittings on the car. Open the bleed valves on the fi11ings.
f. Purge liquid and vapor hoses to the VCM incinerator header with nitrogen for approximately 3 minutes.
17.
Depressurize both hoses with proper vapor valves.
liquid and fittings.
vapor hoses. Remove piping
Plug ends to liquid
of and
18.
Check all angle valves on car. Secure all plugs in valves with appropriate size wrench. Check for leaks. If liquid leak is found on car, repairs must be made using an ftir1ine mask. If you cannot correct the leak, call your Foreman.
19.
Disconnect ground connections and seal Apply VCM I.D. dome tag. Raise access car .
dome ramp
cover. from the
20. Complete Loading Report. Car is now ready for shipment.
a. Remove the wheel chocks.
b. Open blue flag signs.
c. Leave derails closed.
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21.
After finishing at rack and before leaving area secure loading pumps at sphere.
Close discharge valves and open 1/2" valve on re-circulation line to float line back to sphere. Leave sphere suction valve open to float lines back to sphere.
KEY POINTS
1. Per DOT regulations, severe penalties can be imposed upon us for not placarding tank cars proper 1y.
2. Hands on training will be provided by an experienced Tankerman.
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