Technical Specifications

Pro-Flex
®
CSST
INSTALLATION • PRACTICES GUIDELINES
1. Pro-Flex
®
flexible gas piping (CSST) may only be installed by a Qualified/Trained Installer who has been trained in
the use of Pro-Flex
®
. A Qualified/Trained Installer card is required to purchase and install Pro-Flex
®
(CSST) Flexible
Gas Piping.
2. Only the components provided or specified by Tru-Flex Metal Hose Corp., (including Pro-Flex’s striker plates and
Floppy Flex
™
armor conduit) as part of the piping system are to be used in the installation.
3. Never use Pro-Flex
®
flexible gas piping or system components as a ground electrode or as a grounding path for
appliances or electrical systems.
4. Pro-Flex
®
(CSST) flexible gas piping routed in a location which is concealed, constrained and within 3 inches of a
potential threat will be protected against damage by protection devices listed in the Pro-Flex
®
Installation/Training
Guide. Contact with sharp objects or harmful substances should be avoided.
5. Concealed tubing shall be protected from puncture threats, using the striker plates provided, at all points of penetration
through studs, joists, plates or similar structures. The extend of protection is defined as follows:
• All points of penetration less than 2 inches (50.8mm) from any edge of a stud, joist, plate etc., a striker
plate is required to provide protection at the area of support and within 5 inches (127mm) of each side
(if appropriate) of the support.
• At points of penetration 2 to 3 inches (50.8 to 76.2mm) from any edge of a stud, joist, plate, etc., a
striker plate is required to provide protection throughout the area of support.
• At points of penetration greater than 3 inches (76.2mm) from any edge of a stud, joist, plate etc., no
protection is required.
• Tubing routed horizontally through studs shall be protected from puncture threats between the studs
using shielding devices provided.
6. CSST greater than 1-in (25.4 mm) inside diameter installed within hollow cavity walls of 2 x 4 construction shall be
protected along the entire concealed length in the manner and using the shielding devices specified by the
manufacturer.
7. The width of the installed striker plate, at the points of penetration through wall studs, floor joists, plates, sills, etc.,
shall be out at least 1.5 times the outside diameter of the tubing.
8. Open ends of the tubing are to be temporarily
plugged or taped closed prior to installation to
prevent entrance of dirt, dust or other debris.
9. The protective yellow jacketing should be kept in
place as much as possible to
protect the tubing from corrosive threats. Contact
with chemicals containing
chlorides must be followed by thorough rinse and
wipe dry. This includes fluxes used to solder
copper tubing and acid base cleaners used to wash
masonry.
10. Installation clearance holes for routing CSST are to be approximately 1/2 inch greater than the O.D. of the CSST.
Drilling of any structural member must be in conformance with the local building codes.
Refer to the table for the
recommended drill hole sizing.
11. Supporting CSST. Tubing shall be supported with pipe straps, bands or hangers suitable for the size and weight of
the tubing, at intervals not to exceed those shown in the table. Tru-Flex
®
Metal Hose Corp., recommends the use of
metal pipe straps because some plastic clips are susceptible to breakage upon subsequent handling
12. Recommended MINIMUM BEND RADIUS FOR CSST:
13. Undue stress or strain on the tubing and fittings should be avoided. Also avoid
sharp bends, stretching, kinking or twisting of the CSST tubing.
14. Sizing of Pro-Flex
®
CSST must be performed using the capacity tables found in
this Pro-Flex
®
Installation/Training Guide.
15. Pro-Flex
®
(CSST) flexible gas piping should not be connected to moveable
appliances. Connections to moveable appliances such as ranges and clothes dryers
should be accomplished with a “flexible gas appliance connector.”
16. Regulators are suitable for multi-poise mounting. When using a vent limiting
device, the regulator must be mounted in a horizontal upright position. For outdoor
venting, the vent line must be at least the same size as the vent connection and no
longer than 30 feet before upsizing. When mounting a regulator outdoors, remove
vent limiting device and position regulator inverted with open port down.
17. A manifold assembly utilizing a pounds-to-inches regulator shall include a shut-off
valve ahead of the regulator and installed in an accessible location so that the
regulator can be inspected, maintained and serviced if necessary.
18. Buried or Embedded: CSST shall not be buried directly in the ground or directly
embedded in concrete (i.e.: patio slabs, foundations and walkways) When it is
necessary to bury or embed CSST, the tubing shall be routed inside a non-metallic,
watertight conduit that has an inside diameter at least 1/2 inch greater than the O.D.
of the CSST Tubing For ends of conduit installed outdoors, the conduit shall be
sealed at any exposed end to prevent water form entering. No mechanical joint
fittings are permitted within the conduit.
Note: CSST must be buried in accordance with
all local building codes.
19. Pro-Flex
®
(CSST) flexible gas piping system must be pressure tested for leaks
during rough construction in accordance with all local codes. In the absence of
local requirements, test in accordance with Part 4 of the NFPA 54, National Fuel
Gas Code ANSI Z223.1 and/or CSA B149.1 Installation Codes or in accordance
with the requirements of the applicable local codes. For a ‘one-part’ pressure-test,
the regulator should be removed from the system. For a ‘two-part’ test, the regulator
should be isolated from downstream test pressures.
20. Along Side of a structure: When installed along the outside of a structure (between
the ground and height of 6 ft) in an exposed condition, the CSST shall be protected
from mechanical damage inside a conduit or chase. A conduit or chase is not
required if the tubing is installed in a location that will not subject the CSST to
mechanical damage.
21. Meter Hook-Ups. Refer to the Pro-Flex
®
installations and illustrations shown in
this training guide. CSST shall not be used as a means of support for the gas
meter. Also check with your local code official or authority having jurisdiction on
meter hook-ups. Some restrictions may apply. Local code requirements will always
take precedence.
22. For a Piping system which includes manual gas valves listed as complying with
IAS U.S. Requirement 3-88 and/or CR91-002, and not listed as complying with
ASME B 16.33 and/or CGA 3.11, the instructions shall state that these valves shall
not be installed outdoors.
23. When installing Pro-Flex
®
Flexible Gas Piping (CSST) through a sheet metal
enclosure (such as a gas fireplace), the CSST tubing must be protected by
grommets, bushing or armor (Floppy-Flex
™
), PVC tape, shrink sleeve material or a
minimum of four (4) wraps of 10 Mil Duct-Tape. This is to ensure that no physical
contact will be made between the metal and the CSST tubing that would cause
mechanical wear.
24. In accordance with the NFPA 54 Section 7.13, Pro-Flex, LLC, requires proper
bonding of the Pro-Flex® gas-piping systems in a structure to the structure’s
electrical grounding system. This must be performed by a qualified person
recognized by the local jurisdiction as capable of performing such work. These
requirements are for all Pro-Flex® CSST installed from this date forward.
Recommended Minimum Bend Radius
for PRO-FLEX
®
CSST
CSST Pipe Absolute Recommended
Size Min. Bend Min. Bend
Radius Radius
3/8" (10mm) 9/16 inch 3 inches
1/2" (15mm) 3/4 inch 3 inches
3/4" (20mm) 1.0 inch 3 inches
1" (25mm) 3.0 inches 5 inches
1
1
/4" (31mm) 3.0 inches 5 inches
Recommended Horizontal and Vertical Support
Spacing for PRO-FLEX CSST
CSST Pipe Size Horizontal Vertical
Support Spacing Support Spacing
3/8" (10mm) 4 ft. 10 ft
1/2" (15mm) 6 ft. 10 ft
3/4" (20mm) 8 ft. (USA) 6 ft. (CANADA) 10 ft
1" (25mm) 8 ft. (USA) 6 ft. (CANADA) 10 ft
1
1
/4" (31mm) 8 ft. (USA) 6 ft. (CANADA) 10 ft
Recommended Installation for
Clearance Holes for Routing CSST.
Tubing Size Drill Hole Size
3/8” (10mm) 1-1/8”
1/2” (15mm) 1-3/8”
3/4” (20mm) 1-1/2”
1” (25mm) 1 -3/4”
1
1
/4” (31mm) 2 -1/4”
232584 PF-CSST_17647-TF-PF-CSST 12/20/11 1:59 PM Page 2