I would like to ask everyone: on the nameplate of a Roots blower, there is a parameter labeled SUC.PRESS. ATM – what does ATM mean?
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Background information: The device is a Roots blower, and the photo shows its nameplate. The altitude of the location where it is used is 1200 m, with an atmospheric pressure of 87–88 kPa. The parameter on the nameplate, SUC.PRESS. ATM, refers to the suction pressure. Does ATM denote standard physical atmospheric pressure or ambient atmospheric pressure?
SUC PRESS = Suction pressure; DIS PRESS = Discharge pressure. ATM refers to standard atmospheric pressure, with 1 atm = 101.325 kPa
ATM is an abbreviation for atmosphere, referring to the standard atmospheric pressure at sea level on Earth. In chemistry, the atmospheric pressure under standard conditions is 1 atm. In engineering fluid mechanics, when “atm” is not specifically referring to standard atmospheric pressure, it generally denotes engineering atmospheric pressure; therefore, it is important to consider the context in which it is used.