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AGA XQ0008
ANSI B109.1 - 2000 for Diaphram-Type Gas Displacement Meters (Under 500 Cubic Feet Per Hour Capacity)
This publication represents a basic standard for safe operation and substantial and durable construction for diaphragm-type gas displacement meters having a gas flow rating of under 500 cubic feet per hour (14.2m3/h) at 0.5 inch water column (125 Pa) differential pressure at standard conditions.
American Gas Association [aga]