Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Bulletin No. 4660-PGP2T
0
Parflex
®
Flexible Gas Piping System
Design and Installation Guide
OPD –
Over-pressure protection device. To comply with the ANSI Z21.80 standard for line pressure regulators, installations exceeding 2 psi nominal
require a tested and approved over-pressure protection device for use with the regulator.
Parflex
®
–
Trade name for Parker Gas Piping.
Parflex Piping System –
An assembly of CSST intended for field assembly and Application in residential and commercial buildings to distribute fuel
gas to gas utilization equipment within the building. The piping system may also include a gas pressure regulator(s), a shut-off valve(s), tube
shielding devices, distribution manifold(s), and other approved devices or components.
Pressure –
Unless otherwise stated, is expressed in pounds per square inch above atmospheric pressure, i.e., gauge pressure (psig).
Pressure Drop –
The loss in 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.
PSIG (psig) –
Pounds per square inch gauge. The pressure as read from a measurement gauge or device. Gauge pressure is pressure above atmo-
spheric pressure.
Purge –
To displace the original air, or gas, or a mixture of gas and air in a gas conduit with a new air/gas mixture.
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
who has complied 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 connec-
tor to a gas supply and which is equipped with an automatic means to shut off the gas supply when the device is disconnected.
Regulator, Pressure –
A device placed in a gas line for reducing, controlling, and maintaining the pressure in that portion of the piping system
downstream of the device.
Regulator, Vent –
The opening in the atmospheric side of the regulator housing permitting the in and out movement of air to compensate for the
movement of the regulator diaphragm.
Shielding Device –
A component of the piping system used to protect the installed CSST from accidental puncture by nails, screws or similar hard-
ware at concealed tubing support points.
Specific Gravity –
As applied to gas, the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condi-
tions.
Striker Plate –
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.
Valve Shut-off –
A device used in piping to control the gas supply to any section of the piping system or to an appliance. It is located in the piping
system and is readily accessible and operable by the consumer to shut off individual equipment.
Water Heater –
An appliance for supplying hot water for domestic or commercial purposes other than for space heating.
Section 8.0 Definitions
