Installation Instructions

51
CONVERSION FACTORS
INCHES OF WATER COLUMN (in.-w.c.) - Method by which
pressure is measured inches by a manometer or pressure gauge. Used in the gas
industry when the pressure is less than 1 psi.
TERMINOLOGY
AGA - American Gas Association
ANSI - American National Standards Institute
ANSI Z223.1 - 1992 edition of the National Fuel Gas Code published by American
National Standards Institute. Also known as NFPA 54 (National Fire Protection
Association pamphlet 54)
ASTM - American Society for Testing and Materials
APPLIANCE (Equipment) - Any device which utilizes gas as a fuel or raw material to
produce light, heat, power, refrigeration, or air conditioning.
APPROVED - Acceptable to the authority having jurisdiction.
ASME - American Society of Mechanical Engineers
AUTHORITY HAVING JURISDICTION -The organization, office or individual responsible
for “approving” equipment, an installation or 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.
CFH - Gas flow rate stated in cubic feet per hour. A CFH of natural gas usually contains
1,000 BTU’s and LPG contains 2,500 BTU’s. Consult your local gas utility for actual BTU
content in your area.
CAN-CGA-B149-1 - Natural gas installation code book used in Canada. Most current
edition.
CAN-CGA-B149.2 - Propane gas installation code book used in Canada. Most current
edition.
CSST - Corrugated stainless steel tubing
CONCEALED GAS PIPING - Gas piping, which, when in place in a finished building,
would require removal of permanent construction to gain access to the piping.
CONNECTOR, GAS APPLIANCE - A factory-fabricated assembly of gas conduit and
related fittings 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 av
ailable after the gas meter.
DESIGN PRESSURE - The maximum permitted operating pressure.
DRIP LEG - The container (dirt trap pocket) placed at the lowest point in a system of
piping to collect foreign materials and condensate. The container must be accessible for
cleanout.
EHD (EQUIVALENT HYDRAULIC DIAMETER) - A measurement of the relative
hydraulic efficiency between different tube sizes. The larger the value of EHD, the
greater the flow capacity.
ELEVATED PRESSURE SYSTEM - Terms for any pressure above 1/2 PSIG, but less
than 5 PSIG.
EXPOSED GAS PIPING - Gas piping which will be in view in the finished structure.
FUEL GAS - A commonly distributed gas used for fuel such as natural gas, manufac-
tured gas, undiluted liquefied petroleum gas (vapor phase only), liquefied petroleum
gas-air mixtures of these gases (included propane and butane).
GAS UTILIZATION EQUIPMENT - Any device which utilizes gas as a fuel or raw mate-
rial or both.
JOINT - A connection between two lengths of tubing or a length of tubing and fitting.
LISTED - Equipment or materials including a list published by an organization accept-
able to the authority having jurisdiction and concerned with product evaluation that
maintains periodic inspection of production of listed equipment or materials and whose
listing states either that the equipment or material meets appropriate standards or has
been tested and found suitable for use in a specified manner.
LOCKUP PRESSURE, REGULATOR - The system pressure, immediately downstream
of the regulator, at which the regulator valve will completely close (leak tight) under no-
flow conditions to prevent the downstream pressure from exceeding a predetermined
level.
LOAD - The amount of gas required by an appliance, or group of appliances per their
manufacturers rating (see CFH definition).
MANIFOLD - A fitting to which a number of branch lines are connected.
MAXIMUM ACTUAL OPERATING PRESSURE - The maximum pressure existing in a
piping system during a normal annual operating cycle.
METER - An instrument installed to measure the volume of gas delivered through a pip-
ing system.
NFPA - National Fire Protection Agency
PIPING SYSTEM - As used in this manual, an assembly of corrugated stainless steel
tubing and tubing connection fitting, intended for field assembly and installed in residen-
tial or commercial building to distribute fuel gas to gas utilization equipment within the
building. The piping system may also include a gas pressure regulator(s), shutoff valves,
tube shielding devices, distribution manifold(s) and other approved devices or compo-
nents.
PRESSURE - Unless stated otherwise, is expressed in pounds per square inch above
atmospheric pressure, i.e. gauge pressure (PSIG).
PRESSURE DROP - The loss of static pressure of flowing fuel gas due to friction or
other flow resistance in tubing, fittings, valves, regulators or other devices in the piping
system.
PRESSURE REGULATOR - A valve which reduces and maintains pressure. It automati-
cally opens and closes in response to changing pressure conditions in the downstream
piping.
PSIG - Pounds per square inch, gauge. The pressure as read from a measurement
gauge or device. Gauge pressure is pressure above atmospheric pressure and is some-
times referred to as PSI.
PURGE - To completely displace an existing gas with a new gas.
QUALIFIED INSTALLER - Any individual, firm, corporation or company which either in
person or through a representative is engaged in and is responsible for the installation
or replacement of building gas piping systems, who is experienced in such work, familiar
with all precautions required, and has compiled with all the requirements of the authority
having jurisdiction.
QUICK-DISCONNECT DEVICE - A hand-operated device which provides a means for
connecting and disconnecting an appliance or an appliance connector to a gas supply,
and which is equipped with an automatic means to shut off the gas supply when the
device is disconnected.
REGULATOR, GAS APPLIANCE PRESSURE - A device placed in a gas line for con-
trolling and maintaining a uniform pressure to the manifold or gas burning equipment
REGULATOR, PRESSURE - A device installed/placed in a gas line for reducing, con-
trolling and maintaining the pressure in that portion of the piping system downstream of
the device. This device is used in elevated pressure systems and is referred as a pres-
sure regulator in this manual.
REGULATOR, SERVICE PRESSURE - A device installed by the servicing gas supplier
to reduce and limit the service line gas pressure to delivery pressure.
REGULATOR VENT - The opening in the atmospheric side of the regulator housing per-
mitting the in and out movement of air to compensate for the movement of the regulator
diaphragm.
SHIELDING DEVICES - A component of the piping system (Floppy-Flex(tm)) used to
protect the installed corrugated tubing form accidental puncture by nails, screws or simi-
lar hardware at concealed tubing support points.
SPECIFIED GRAVITY - As applied to gas, is the ratio of the weight of a given volume to
that of the same volume of air, both measured under the same conditions.
STRIKER PLATES - A special type of shielding device used when concealed tubing is
run through wall studs, floor and ceiling joists or other structural members where tubing
movement is restricted.
TUBING - ASTM A240 Type 304 Annular Corrugated Stainless Steel Tubing which is
bendable and comes in 75 foot coils.
VALVE, SHUTOFF - A device used in piping to control the gas supply to any section of
the piping system or to an appliance.
VENT LIMITING DEVICE - A valve that limits the discharge of gas from a regulator in
the event of a diaphragm rupture. Gas discharge is limited to an ANSI approved level.
See manufacturer’s specifications.
WATER COLUMN, INCHES - method of stating pressure measured in inches of water
column by a manometer or pressure gauge. Refer to “CONVERSION FACTORS” listed
at the beginning of this text.
9.0 Terminology
1
2
PRESSURE CONVERSION CHART
1/4 psi = 6.921 in. w.c. = (approx. 7 w.c.)
1/2 psi = 13.842 in. w.c. = (approx. 14 w.c.)
1 psi = 27.684 in. w.c. = (approx. 28 w.c.)
2 psi = 55.368 in. w.c. = (approx. 56 w.c.)
5 psi = 138.42 in. w.c. = (approx. 140 w.c.)
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