In what units are steam pressure gauges typically calibrated?

Steam pressure gauges are typically calibrated in pounds per square inch (psi) because this unit is standard in the United States for measuring pressure in various applications, including steam systems. Psi is widely recognized and provides a clear understanding of how much pressure is being exerted in a system, making it particularly useful for engineers and technicians working with steam boilers and other equipment.

The use of pounds per square inch allows for easy conversion to other pressure measurements, which can be beneficial when comparing readings or working with different systems. This standard is familiar to many in the field, which supports safety, maintenance, and operational procedures across different facilities.

Other units such as millimeters of mercury, pounds per square foot, and bars, while they may be used in specific international standards or different contexts, are not as commonly employed in the calibration of steam pressure gauges in the U.S. Each unit has its relevance, but psi remains the most prevalent in practical applications for monitoring steam systems.