Need help on airing off corrosives

Truck runs at 1100 when Im doing this and about 12psi is all I get but because our products are so heavy. The trailers are only about 2/3's full when loaded. So we have alot of air space to fill and only takes about 40 minutes to push off 3900 gallons or 61,000 pounds of product. Also I never build pressure in the tank before opening the product valves.

 

did Alum chlorhydrate solution at a Revlon plant using Matlack's engine compressor setup., tank was around 1000 feet away, took 6 hours to blow 3500 gal...

 

Not sure what you mean,
Never build pressure before opening valves.
Typo?
If you open valves you'll never build enough pressure.

 

I open my product valves on the trailer so it puts product in the hose before there is any air pressure built up in the trailer. I do this because when hauling sluphuric acid I would rather have a leak with no pressure behind it then have a leak with 20psi of air pressure behind it. It will build air pressure as it unloads as all of our unloading pipes go at least 15' feet up before going to the tank.

 

Here's my setup. The relief valve is set for 30 psi, but I occasionally run a bungee over it to get 40-45 psi when I need it. I haul mainly ISO tanks that can handle higher pressure, but even running 1000 rpm's, I only get to 22-24 on domestics.

 

I'm surprised they didn't supply you with an air hose. I'd use a 1" hose to prevent the compressor from getting choked. The hose should be about 40 feet long so it can easily reach the top of the tank. As for airing off, you should ask for training on it. Easier to see it done than just describe it.

You hook your air hose from the compressor to the air inlet on or near the dome lid. Some trailers even have the air inlet near the front of the trailer. Always be sure to let product into the hose to check for leaks before turning the air on. A leak will spray if there's air pressure already on it. Be sure to use a fitting with an air release valve between the external valve and your hose so that you can let the air pressure out after you are finished unloading the product. This will keep the hose from flying off when you take it off. I also use orange straps everywhere to ensure all the hose and fitting connections stay tight. Don't forget to wear your PPE, and good luck!

 

HUH?!

 

I used the hose you get at the truck stops to pump up tires to make my own air hose for airing off loads.if you need to regulate air pressure you can use the ball valve on top of the tank to regulate air input. Just keep an eye on it. I use the truck air compressor instead of auxiliary air compressor. But I have some customers who provide air with no regulator and just use the ball valve to regulate.