The ANSI B109 standard, developed by the American National Standards Institute (ANSI), consists of the following sections under the main title "For gas displacement meters and service regulators":
The ANSI B109.1 standard applies to diaphragm type gas displacement meters designed for revenue measurement of fuel gas with a flow rate of less than 12,7 m125/h at a differential pressure of 14,16 mm water column (3 Pa) in basic conditions. This standard consists of the following parts:
The ANSI B109.2 standard applies to diaphragm type gas displacement meters designed for revenue measurement of fuel gas with a flow rate greater than 12,7 m125/hr at a differential pressure of 14,16 mm water column (3 Pa) in basic conditions. This standard consists of the following parts:
The ANSI B109.3 standard is a fundamental standard for safe operation, robust and durable construction, and acceptable performance for rotary type gas displacement meters. This standard consists of the following parts:
The ANSI B109.4 standard applies to the minimum design, material, performance, and test requirements for 125 mm and smaller self-acting diaphragm-type natural gas service regulators operating at inlet pressures up to 861,8 psig (32 kPa). These regulators are used to control the gassing pressure to pressures in the maximum 355,60 mm water column (3.48 kPa). This standard is only valid for regulators manufactured after the approval date of this standard.
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