Why is the mass flow method superior at low flow rates? | | | Why is the mass flow method superior at low flow rates? | | | |  | Let’s assume perchloroethylene is being spiked at 10 lb. /hr. A drum of perchloroethylene weighs 700 lb., so the scale divisions are 0.5 lb. The starting and final weights will then be + 0.25 lb., and the weight pumped over 2 hours will be 20 + 0.5 lb., a margin of error of 2.5%. This compares to an expected mass flow error of <1.0%. In addition, trial burns are usually conducted outside, so inclement weather may make it very difficult to read the scale accurately. Bad weather does not affect mass flow meters. | | |
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