Without this vital information, no one should ever offer you any type of valve quote. At the top of the I, write in the tank’s MAWP (Maximum Allowable Working Pressure) and at the bottom, the tank’s MAWV (Maximum Allowable Working Vacuum). To get us started, we will simplify the tank optimization process by drawing a capital letter “I” on a piece of paper. It is VERY important that the ERV only open in the case of an upset condition. This causes the ERV to open when it shouldn’t. A common problem in the field is when the ERV is set too close to the PRV. On the left side of the picture you’ll see the ERV. For those of you who don’t work with BGRs on a regular basis, it is used to provide an inert gas in the vapor space over the media in the tank whereby limiting potential flammability. In the middle of the picture we have a PVRV and to the right of the PVRV is a BGR.
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