In terms of pressure gauge graduation, what is usually the maximum multiplier for MAWP?

The maximum multiplier for the Maximum Allowable Working Pressure (MAWP) in terms of pressure gauge graduation is typically 3.5. This standard is established to ensure that pressure gauges accurately reflect the pressure within the system while providing a safety margin.

Using a multiplier of 3.5 means that the gauge is designed to read a pressure that is 3.5 times higher than the MAWP. This ensures that the gauge can handle transient pressure fluctuations that might occur during operation, which helps prevent gauge failure and promotes safety in the workplace. Choosing a gauge with a graduation exceeding the MAWP significantly reduces the risk of inaccurate readings and potential hazards related to overpressure conditions.

Other multipliers, while they may be seen in specific applications or under different regulations, do not align with the commonly accepted standard of 3.5. Thus, for general practices and in the context of the TDLR Boiler Commission standards, 3.5 is the maximum multiplier recommended for ensuring safety and accuracy with pressure gauges.