Hose coupling to the Mouth..:}

I guess that's your "welcome to tanking" moment.

 

If your are absolutely sure your mt you can crack an ear before you shut the trailer valve. Once you get a little air sucking close the trailer valve......


Some guys use one of these



You thread a 1/4 turn valve on to that nipple on the reducer. And that lets you break the suction before disconnecting the hose.... They come in all sizes 4 ,3 or 2..... that's the only pic I could find.

I've got at least 3 of them....but almost never use them . After a while you get the hang of it and it's not a issue...

 

I use fittings with blow off valves. I have a 3-3 & 3-2. This way you can relieve the pressure before attempting to undo the camlocks. I can post a pic of you want.

 

Yup the way i use to do it.

 

Why would you uncouple hose with pump running? Clear hose best you can, close main tank valve, shut off pump, break hose seal, restart pump if there is enough product to suck up.

Thats the way we did it with foodgrade. Maybe your hauling something that you have to inflict bodily harm in order to get bol signed?

 

I uncouple the hose with pump running all the time .

Mt out shut trailer valve , break hose with pump running at speed . This allows a full charge of air to help clear the line of product.

Then if your worried about back pressure cap the intake side of the pump while idling and the close the tank cust tank valve..The pump is air locked at this point nothing will happen....

If you know there's no back pressure just shut off pump with everything open.....

When I start up I hook to the cust tank and start the pump with the intake side open . So you can tell if air is being pumped threw the line. That way you know if the line is slugged or some valve is closed ...

If air is being pumped then I hook the suction hose from the trailer to pump while running at idle. If all seems ok then I speed up pump......

 

Because it's not food grade and if it's diesel it's gonna need to be cleared very well. Hell when I used a pump it was for oil, and you better keep that pump running or your gonna have a big mess at the end.

 

Matlack's roper pumps didn't clear the suction hoses too well, I taught drivers to close and the re-open the trailer valves after allowing vicious product to drain down some and the re-close the valves and open the hose ears at the trailer outlet, hold the hose end up and push it forward to form a loop then walk the loop rolling any product in the suction hoses into the pump.

The look of disbelief on a rookie's face when I then said he could lay the hose down as it is empty was priceless...they all stared at the open end looking for product to flow back out. It never did.

I also cautioned them to make sure if air pressure was used to make absolutely sure that the pressure was off the hose before attempting to open the hose. Had one stop where we blew the product into the bottom with no relief valves so we had to shut the line off at the customer and de-pressurize the tankwagon before un-hooking the hose.