Installation Instructions

51
CONVERSION FACTORS
I
NCHES OF WATER COLUMN
(
in.-w.c.) - Method by which
p
ressure is measured inches by a manometer or pressure gauge. Used in the gas
i
ndustry when the pressure is less than 1 psi.
T
ERMINOLOGY
A
GA -
A
merican Gas Association
ANSI - American National Standards Institute
A
NSI Z223.1 -
1
992 edition of the National Fuel Gas Code published by American
National Standards Institute. Also known as NFPA 54 (National Fire Protection
A
ssociation pamphlet 54)
ASTM - American Society for Testing and Materials
APPLIANCE (Equipment) - Any device which utilizes gas as a fuel or raw material to
p
roduce light, heat, power, refrigeration, or air conditioning.
APPROVED - Acceptable to the authority having jurisdiction.
ASME - Ameri
can Society of Mechanical Engineers
AUTHORITY HAV
ING JURISDICTION -
The organization, office or individual responsible
for “approving” equipment, an installation or procedure.
BTU - Abb
reviation for British Thermal Unit, which is the quantity of heat required to
r
aise the temperature of one pound of water one degree Fahrenheit.
C
FH -
G
as 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
c
ontent in yo
ur 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 con
vey gaseous fuel, and used for making connections
betw
een a gas supply piping outlet and the gas to an appliance. It is equipped at each
end for attachment to standard taper pipe threads.
DELIVER
Y PRESSURE -
Gas pressure a
v
ailab
le 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
h
ydraulic efficiency between different tube sizes. The larger the value of EHD, the
g
reater the flo
w 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 b
utane).
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
o
f the regulator, at which the regulator valve will completely close (leak tight) under no-
f
low conditions to prevent the downstream pressure from exceeding a predetermined
l
evel.
LOAD - The amount of gas required by an appliance, or group of appliances per their
m
anufacturers rating (see CFH definition).
MANIFOLD - A fitting to which a number of branch lines are connected.
M
AXIMUM ACTUAL OPERATING PRESSURE -
T
he maximum pressure existing in a
piping system during a normal annual operating cycle.
M
ETER -
A
n instrument installed to measure the volume of gas delivered through a pip-
ing system.
NFPA - National Fire Protection Agency
P
IPING SYSTEM -
A
s used in this manual, an assembly of corrugated stainless steel
tubing and tubing connection fitting, intended for field assembly and installed in residen-
t
ial or commercial building to distribute fuel gas to gas utilization equipment within the
b
uilding. 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-
n
ents.
PRESSURE - Unless stated otherwise, is expressed in pounds per square inch above
a
tmospheric pressure, i.e. gauge pressure (PSIG).
P
RESSURE DROP -
T
he 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 REGULAT
OR -
A va
lve which reduces and maintains pressure. It automati-
c
ally opens and closes in response to changing pressure conditions in the downstream
piping.
P
SIG -
Pounds per square inch, gauge. The pressure as read from a measurement
gauge or dev
ice. Gauge pressure is pressure above atmospheric pressure and is some-
t
imes referred to as PSI.
P
URGE -
T
o completely displace an existing gas with a new gas.
QUALIFIED INSTA
LLER -
A
ny
individual, firm, corp
oration 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
REGULA
TOR, PRESSURE -
A de
vice installed/placed in a gas line for reducing, con-
trolling and maintaining the pressure in that por
tion 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 corr
ugated tubing form accidental puncture by nails, screws or simi-
lar hardw
are at concealed tubing suppor
t points
.
SPECIFIED GRAVITY - As applied to gas, is the ratio of the weight of a given volume to
that of the same v
olume of air
, both measured under the same conditions
.
STRIKER PLATES - A special type of shielding device used when concealed tubing is
r
un through w
all studs
, floor and ceiling joists or other str
uctural members where tubing
movement is restricted.
TUBING - ASTM A240
T
ype 304 Annular Corrugated Stainless Steel Tubing which is
bendable and comes in 75 foot coils.
V
AL
VE, SHUTOFF -
A de
vice used in piping to control the gas supply to an
y 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.)