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Originally Posted by Fozzy
It depends on the product and this is just generally but most tankers you place the truck in the proper place (fun in itself) take the hoses out of their storage buckets, hook up to the bulkhead, recheck all your connections. open the internal valves and if you are using a pump recheck all your connections again (strapping all the connections on the delivery side) and open the valves. Turn on the PTO and release the clutch and get out there and look for leaks or other problems! You will either need to have a vapor return line or you will need to open the top of the tanker itself (depending on the product of course). If you do not have a way to vent the tank and you start unloading or pumping off, you will end up with a catastophic "implosion" of the tank.. really cool to see if it's not your tanker BTW~ :wink:
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Pretty much the way a "pump off" goes...... And while its cool to see a tank implode....its still kinda painful thinking about it....
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Theres a lot of things that the guy or gal who takes you out for the first few times can explain to you. Its kind of hard to describe. Watch out for the loaded hoses and NEVER crack loose a connection unless you are 100% sure that the line has no pressure in it!!!!!
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Make sure you pay close attention to your trainer when you ride with him, and don't get away from him until you have it all down pat and are comfortable with what you are doing.
The other way to unload a tank...actually there are two ways... first is a simple "gravity drop", usually done with gas and diesel. And thats where you need a vapor return, and make sure there's no-one around with a lit cigarette or anything nearby. The second way is to "air-off" the load. Simply put.... its hooking up either your truck air or an auxiliary compressor to the chicago fitting on the air inlet on the tank and building up some pressure in the tank to push the product out.
Remember: Pump off flammables, air off corrosives.... Never do the reverse.
Also, before you ever unload a tanker by any method, get the receivers signature on your paperwork that your hoses are right, hooked up right, that their valves are open and they can take all of the product....that way if something goes wrong.... its gonna probably fall on them not you.
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