the end of the unloading hose through the tank dome until it almost touches the bottom of the tank. Keep the
hose below the surface of the product until the tank is completely unloaded. Connect the pump discharge
line to the inlet of the receiving container. Place the dome cover over the manhole so that the cover rests
against the hose and allows ample space for venting. Follow pumping procedures described above. When
the tank car is almost empty, manipulate the hose so that all product is drawn from the car. If possible,
remove the bottom outlet cap and drain product from the outlet chamber into the tub.
Follow-Up Procedures. Make sure that the tank car is completely empty. Gage and sample the
contents of the receiving tank, correct volume to 60 degrees Fahrenheit, and record the data. Compare the
quantity of product delivered to the receiving tank with quantity taken from the tank car. Report excessive
loss to the proper authority. Allow ample time for any suspended water and sediment to settle in the receiving
tank, drain the water, gage the contents again, and record data. Close the bottom outlet valve. Remove the
unloading hose from the tank car. If a wooden block is used to hold the dome cover open, be sure that the
block does not fall into the tank car. Disconnect the tank car adapter, and replace the outlet cap; tighten the
cap with a tank car wrench. Close and lock the dome cover; remove the drainage tub and discard any
product in the tub. If the car has FLAMMABLE placards, remove and replace them with DANGEROUS-
EMPTY placards. Disconnect grounding wire from the tank car; remove derails, if provided; and remove
TANK CAR CONNECTED signs. Release the brakes and remove the car from the transfer area. Notify the
proper authority that the unloaded tank car is ready for removal and is being returned empty, free for load.
Report any defective car to the property authority.
PART G - CLEANING TANK RAIL CARS
The two most common reasons for cleaning tank cars are contamination and change of product. Prior to
beginning cleaning operations, appropriate safety measures must be taken. These include bonding and
grounding the car and placement of safety signs and fire extinguishers. Clean uncoated tanks by steaming
for one hour. If sludge remains, continue steaming until clean. On tank cars with multiple compartments
clean one compartment at a time. Allow the tank(s) to cool then check with explosimeter. Remove residual
sludge and steam again with cleaning solvent. Allow the tank to cool then dry with lint-free rags.
Never clean coated tanks with steam. Use air ejector or air eductor to vapor free the tank, check with
explosimeter, then remove sludge. Scrub the tank with solvent, rinse with warm water and dry with lint-free
rags.
9-7
QM 5094
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