Installation Guide

50
Chapter 9: Denitions
A.G.A. American Gas Association
ANSI Z223.1 1988 The 1988 edition of the National Fuel Gas Code published by American
National Standard Institute. Also known as NFPA 54 (National Fire Protection Association).
Appliance (Equipment) Any device which utilizes natural gas or propane as a fuel or raw
material to produce light, heat, power, refrigeration or air conditioning.
Approved Acceptable to the authorities having jurisdiction.
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
Authority Having Jurisdiction The organization, oce or individual responsible for
"approving" equipment, an installation or a procedure.
BTU Abbreviation for British Thermal Unit, which is the quantity of heat required to raise the
temperature of one pound of water one degree Fahrenheit .
CAN-CGA-B149.1 Natural gas installation book used in Canada.
CAN-CGA-B149.2 Propane gas installation book used in Canada.
CFH Gas ow rate stated in cubic feet per hour.
CSST Corrugated stainless steel tubing
Concealed Gas Piping Gas piping, which, when in place in a nished building, would
require removal of permanent construction to gain access to the piping.
Connector, Gas Appliance A factory-fabricated assembly of gas conduit and relating t-
tings designed to convey gaseous fuel, and used for making connections between a gas
supply piping outlet and the gas to an appliance. It is equipped at each end for attachment
to standard taper pipe threads.
Delivery Pressure Gas pressure available after the gas meter.
Design Pressure The maximum operating pressure permitted by this document, as deter-
mined by the design procedures applicable to the materials involved.
Drip Leg The container (dirt trap pocket) placed at a low point in a system of piping to col-
lect and remove foreign material or condensation.
EHD (Eective Hydraulic Diameter) A relative measure of ow capacity used to compare
individual sizes between dierent manufacturers. The higher the EHD number the greater
ow capacity of the piping.
Elevated Pressure System Refers to any system with a pressure above 1/2 PSIG, but less
than 5 PSIG.
Exposed Gas Piping Gas piping which will be in view in the nished structure.
Fuel Gas A commonly distributed gas used for fuel such as natural gas, manufactured gas,
undiluted liqueed petroleum gas (vapor phase only), and liqueed petroleum gas-air mix-
tures of these gases (including propane and butane).
Full Lockup The capability of totally stopping the ow of gas if the load goes to zero, thus
preventing the downstream pressure from increasing more than a certain upper limit pres-
sure above the set point.
Gas Utilization Equipment Any device which utilizes gas as a fuel or raw material or both.
ID Inside diameter of pipe or tubing.