Pressure Filling UST

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sdisselhorst
Pump Jockey
Posts: 21
Joined: Fri Jun 03, 2011 8:54 am

Pressure Filling UST

Post by sdisselhorst » Mon Nov 19, 2018 11:13 am

I was recently at a startup of a site, and we got to discussing the topic of pressure filling UST's and I heard a few horror stories. One in particular about a driver making a delivery into a UST, using a pump on his truck, blowing the end of the tank out. Anybody else ever hear of tanks rupturing during a pressure fill of a UST? Gathering anecdotes...alternately, anyone feel like this is a safe practice even though it is illegal?

ZMiller
Head Tech
Posts: 975
Joined: Sun Jul 15, 2007 10:53 am
Location: Atlanta/Phoenix/Sacramento

Re: Pressure Filling UST

Post by ZMiller » Mon Nov 19, 2018 2:16 pm

Quite a few times actually and not to terribly unexpected. How about blowing an end out of a tank on a gravity feed or during a tank test? How much ullage and head pressure might one think there could be in a typical tank being delivered to? Some would be surprised.

Probably should be thinking about pressures AND vacuums on UL58 rated tanks as well. Damage typically go's unnoticed for quite a while after a damaging over or under pressure event happens. Why worry about something you normally can't see.

Have seen manifolded tanks feeding one or another where overfill feeds a full tank via the partnered stp and fuel pressure blows the manway gasket, filling the sump untill somebody points out fuel oozing out of a manway cover at grade.

Pressure being sounds like a good subject for a forum poll.
When you are dead it's likely you won't know it. It could be difficult for others. It's the same if you are stupid.
"Tact is the ability to tell someone to go to Hell in a way that they will begin looking forward to the trip"

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