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Glossary:Calibrated vent bag
Non-elastic bag of known, fixed volume when fully inflated.
(Note - Measurement is made by timing the bag expansion to full capacity. The temperature of the gas is measured to allow correction of volume to standard conditions. Additionally, gas composition should be analysed to determine the methane content of the vented gas because in some cases air may also be entrained in the vent, resulting in a mixture of gas and air. Bags of various sizes and known volume are available as calibrated during manufacture. Calibrated vent bags are made from antistatic plastic with a neck shaped for easy sealing around a vent pipe.)[1]