| T O P I C R E V I E W |
| SWMaint.corp |
Posted - 06/22/2012 : 19:25:35
We have a site that has no Phase 2 vapor recovery and they are busy, after fueling for a while the tanks are under 7" of vacuum during this state the Incon probes are reading more fuel than whats in the tanks. If the vacuum is released then the readings are correct. This site has EVR phase 1 and husky 5885 P.V. valves. Does anyone know a solution to this problem? The readings are up to 2000 gallons off.
Thanks |
| 15 L A T E S T R E P L I E S (Newest First) |
| mfaltz |
Posted - 06/29/2012 : 20:04:12
It's atmospheric pressure. The fuel in the tube is under more pressure than the fuel in the tank, causing the level in the drop tube to be less than what is actually in the tank. |
| b35653 |
Posted - 06/29/2012 : 17:58:01
stick the tank after a delivery when the driver still has the vapor hose hooked up to the tank. it will be accurate then. |
| ZMiller |
Posted - 06/27/2012 : 22:51:59
In and around Chicago. I hear a few drivers got fired. In California they catch you doing that your hand-cuffed and taken you to jail. |
| whittingtonm |
Posted - 06/27/2012 : 21:06:06
Oh, you've seen that trick with screw drivers, too? I wouldn't call it a problem with any one color of delivery tanker, though. |
| ZMiller |
Posted - 06/27/2012 : 19:41:10
If you have a split compartment tank and a single wall bulkhead between you might and often do see volume changes depending on how much fuel and or pressure or vacuum is on one side or the other. All the more reasion to order tanks with a double wall bulkhead. As well depending on the proxcimity of the fill riser to the atg riser sometimes but not often a 4" fill tube has been installed in the atg riser to deflect fill fuel vortex away from the 2 or 3" atg water or phase finding float. Those fill tubes often do not have a hole drilled at the tank top/fill riser interface and pressure or vacuum will effect fuel levels in atg filltube. Now you know the silly reasion BP drivers were sticking screw drivers in the tank vent vapor dry-breaks. |
| thebob |
Posted - 06/27/2012 : 15:53:11
May be the tank is not pulling in from the sides but top to bottom? |
| whittingtonm |
Posted - 06/27/2012 : 10:17:44
If the tank under vacuum was being compressed on the sides, it might show a lower fuel reading. If it were compressed from top to bottom, it might show a higher fuel reading.
The Husky spec for that PV valve model says it opens between -6 and -10 inches of water column. Can you try one that opens at -6? |
| SWMaint.corp |
Posted - 06/27/2012 : 09:25:32
When under vacuum the Incon is reading 2000 gallons less than what is in the tank. When the vac is released it is right on. With incon it doesnt give me the inch reading like Veeder-Root. But you stick the tank through the drop tube and the reading is off. So when the truck comes they cant fit the delivery into the tank. I checked the P.V valves they they cracking open at -8.5" w.c. |
| SWMaint.corp |
Posted - 06/27/2012 : 09:23:45
Yes you are right I am baffled the same way. That is why I am puzzled. When under vacuum the Incon is reading 2000 gallons less than what is in the tank. When the vac is released it is right on. With incon it doesnt give me the inch reading like Veeder-Root. But you stick the tank through the drop tube and the reading is off. So when the truck comes they cant fit the delivery into the tank. I checked the P.V valves they they cracking open at -8.5" w.c. |
| RossD |
Posted - 06/26/2012 : 23:53:01
I thought vacuum would suck the sides of the tank inward, wouldn't this raise the product level, not lower it? If you take a plastic bag of water filled half way and suck the air out the water level gets higher not lower. |
| SWMaint.corp |
Posted - 06/25/2012 : 09:28:20
It is opening at -7"w.c. I think that is right. I will double check it today. |
| Glenn Farmer |
Posted - 06/24/2012 : 11:25:56
PVV not operating properly? |
| SWMaint.corp |
Posted - 06/23/2012 : 12:08:36
I am familar with the Magnehelic type gauge that is plumbed into the vent riser. The problem I am having is that they dial into the tank monitor and they cant ever dispatch the correct gallons for the delivery. |
| nettech |
Posted - 06/23/2012 : 12:07:15
They don't call it electronic tank gauge for nothing. Product level is product level. Tank stick vs. Probe the vacuum pulls the level down. |
| justinforman |
Posted - 06/23/2012 : 10:05:46
Isn't that gauge for when you are sticking the tank, and not for the probes? |
All Forums
Improper tank readings
Register Now! 
