Pro-Flex CSST Installation Manual
Pro-Flex,LLC
Flexible Gas Piping Systems
Pro-Flex ® & Flak Jacket
Installation/Training Guide
TM
CSST
Patented System: #5,845,946, #5,857,716, & 6,102,445 other patents pending
www. ProFlexCSST.com
Phone: 877-798-6291
Fax: 765-6139
Pro-Flex,LLC
501 South State Road 341
Hillsboro, IN 47949
Version 17.1
5/2017
PRO-FLEX® CSST
Training Guide and Installation Manual
TABLE OF CONTENTS
1.0 INTRODUCTION
User Warnings, Limitations of Manual ................................................................................................1-3
Applicable Codes & Standards ...............................................................................................................3
2.0 DESCRIPTION OF SYSTEM AND COMPONENTS
System Components ...........................................................................................................................4-7
(Tubing, Fittings, Striker Plates, Pressure Regulators,
Manifolds, Shut-off Valves, Other Components)
3.0 SYSTEM CONFIGURATIONS
System Configurations.............................................................................................................................8
Series Layout & Parallel Layout (low pressure)......................................................................................9
Dual Pressure Layout ..............................................................................................................................9
Multiple Manifold Systems & Combination Steel/CSST System, Elevated Pressure System .............9-10
Determine Pressure System .................................................................................................................11
3.2 SIZING METHODS & EXAMPLES
Low Pressure System (longest length method) (example #1)..............................................................12
Medium Pressure System (example #2) ...............................................................................................12
Elevated Dual Pressure System (example #3).......................................................................................13
Combination Steel / CSST System.........................................................................................................14
4.0 INSTALLATION PRACTICES / GUIDELINES
General Installation Guidelines........................................................................................................16-17
Minimum Bend Radius .........................................................................................................................17
Support .................................................................................................................................................17
4.2 FITTING ASSEMBLY
Assembly and Re-assembly Procedures ...............................................................................................18
Tubing Cutting / End Preparation..........................................................................................................18
Minimum Tightening Torque ................................................................................................................19
4.3 ROUTING
Vertical Runs..........................................................................................................................................20
Horizontal Runs.....................................................................................................................................20
Indoor / Outdoor Issues ..................................................................................................................20-21
Clearance Holes & Notching.................................................................................................................22
Concealed Locations for Fittings..........................................................................................................23
4.4 PROTECTION
Striker Plate Requirements.............................................................................................................24-25
Spiral Metal Hose Requirements ...................................................................................................24-25
Outdoor Installations......................................................................................................................21, 26
Metal Wall Studs Installation ..............................................................................................................22
i
4.5 CONNECTIONS
Meter Hook-ups ..................................................................................................................................26-27
Fixed Appliance.....................................................................................................................................28
Moveable Appliance /Termination Outlets............................................................................................26
Pad Mounted Appliance........................................................................................................................31
Gas Fireplace Installations ....................................................................................................................30
Fire Rated Construction through Plenums and Installations within a chase.......................................20
BBQ Gas Grill – Stationary....................................................................................................................30
BBQ Gas Grill – Moveable ....................................................................................................................31
Gas Lamps.............................................................................................................................................31
CSST Buried Under Concrete Slab.........................................................................................................21
CSST Embedded in Concrete Slab .........................................................................................................21
Supporting of Conduit Embedded in Reinforced Slab...........................................................................21
Short (2 to 6 ft) Outdoor Roof Mounted Installations..........................................................................32
Long Length Outdoor Roof Mounted Installations...............................................................................32
Two Examples of Appliance Termination / Stub-out ............................................................................32
Extending Existing CSST Tubing Run .....................................................................................................23
4.7
4.8
4.9
4.10
5.0
6.0
MANIFOLD STATIONS
Allowable Locations / Configurations ...................................................................................................33
PRESSURE REGULATORS
Installation / Sizing Requirements ........................................................................................................34
Vent Limiter Option...............................................................................................................................35
Vent Line and Sizing Requirements.......................................................................................................36
Adjustments ..........................................................................................................................................36
UNDERGROUND USAGE....................................................................................................................20, 21, 26
ELECTRICAL BONDING........................................................................................................................37-38
INSPECTION / REPAIR / REPLACEMENT
Inspection and Testing of Installed CSST...............................................................................................37
Pressure Testing and Inspection Procedures ........................................................................................37
Appliance Connection Leakage Check Procedure .................................................................................38
Repair / Replacement of Damaged CSST Tubing ............................................................................39, 40
SIZING TABLES (Natural Gas and LP Gas)
Natural Gas – Low Pressure to Medium Pressure ..........................................................................41, 42
Natural Gas – Elevated Pressure ...........................................................................................................43
Natural Gas – 5 psig...............................................................................................................................44
Propane Gas ....................................................................................................................................45, 46
7.0
8.0
9.0
9.2
Iron Pipe Capacity Table ........................................................................................................................47
Referenced Data ...................................................................................................................................48
TECHNICAL DATA SPECIFICATION SHEET....................................................................................................49
CSST INSTALLATION CHECK LIST ..................................................................................................................50
DEFINITIONS OF TERMINOLOGY .................................................................................................................51
WARRANTY INFORMATION ........................................................................................................................52
QUALIFIED INSTALLER CARD ........................................................................................Inside Back Cover
ii
1.0 Introduction
Pro-Flex® CSST and Flak JacketTM Arc-Resistant CSST must be installed by a
qualified installer who meets the following criteria:
1. Installer must meet all qualifications required by the state and/or local administrative authority
[AHJ] administering the provisions of the code where the gas piping is installed.
2. An installer must also be qualified in the use of Pro-Flex® and Flak Jacket
TM
CSST. Qualification
for Pro-Flex, LLC's CSST systems can be completed by reading the Pro-Flex®, LLC's Flexible Gas
Piping System Installation/Training Guide and registering with Pro-Flex, LLC to obtain a
Qualified Installer Card by either mailing in the registration card from the back of the guide or
registering online at www.proflexcsst.com. In submitting either the printed or online
registration, you are affirming that you understand all aspects of the installation requirements
and local plumbing, mechanical, electrical, and/ or building codes applicable. If you do not
understand all requirements and local codes, contact a Qualified Installer. You must presently
possess or obtain prior to installation, a Pro-Flex® Qualified Installer Card.
The installation shall be made in accordance with local codes, or, in the absence of local codes, in
accordance with the National Fuel Gas Code [ANSI Z223.1 / NFPA 54]; Natural Gas and Propane Installation
Code [CSA B149.1]; the International Fuel Gas Code [IFGC]; the Unified Plumbing Code [UPC]; the Federal
Manufactured Home Construction and Safety Standards [24 CFR Part 3280]; or the Standard on
Manufactured Housing [NFPA 501] as applicable. In addition, the installation instructions as precribed by
Pro-Flex, LLC must be followed.
Special attention must be given to the proper design, installation, testing and use of the gas piping. Sound
engineering principles and practices must be exercised as well as diligent adherence to the proper
installation procedures. All installed systems must pass customary installation inspections by the
administrative authority prior to being placed in service.
When a conflict exists between this guide and local code requirements; the local codes shall take
precedence.
Improper installation or operation of the gas piping system may result in fire, explosion, or asphyxiation.
Only components provided or specified by Pro-Flex®, LLC as part of the fuel gas system are to be used in the
installation. Use of components from other flexible gas piping systems other than those specified as part of
the Pro-Flex® piping system is prohibited and may result in poor system performance and serious bodily
injury or property damage.
The installation instructions and practices outlined in this training guide only apply to the use of Pro-Flex®
CSST flexible gas piping systems. Pro-Flex, LLC, assumes no responsibility for installations made with other
manufacturers’ flexible gas piping systems
ANSI LC 1 ● CSA 6.26
“Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST)”
1
This standard applies to natural and propane gas piping systems using corrugated stainless steel tubing
(CSST), intended for installation in residential, commercial or industrial building including the following
components as a minimum:
a) Corrugated stainless steel tubing (CSST) [Pro-Flex® and Flak Jacket
TM
CSST]
b) Fittings for connection to the CSST
c) Striker plates and/or protective conduit to protect the installed CSST from puncture threats. Other
components of piping systems covered in this standard include gas manifolds, gas pressure
regulators. If such additional components are required to complete the gas piping installation,
they shall be either be provided as part of the piping system or specified in this Pro-Flex®, LLC
Flexible Gas Piping Systems CSST Installation/Training Guide.
• Pro-Flex® Fittings are tested for concea
• Pro-Flex
®
and Flak JacketTM CSST can be routed in most locations where traditional rigid gas
lment (subject to local code approval)
piping materials are installed:
* Inside hollow wall cavities and through walls
* Beneath or through floor and ceiling joists
* On top of ceiling joists in an attic space
* Outside of a building to gas meters and propane second stage regulators and nearby
appliances.
• Pro-Flex
®
and Flak Jacket
• Pro-Flex® and Flak Jacket
TM
CSST have been tested and listed by CSA Group for outdoor use.
TM
can be used with all fuel gases recognized in the NFPA 54 National
Fuel Gas Code up to a maximum operating pressure of 5 psi (34.5 kPa). The maximum actual
operating pressure, including transients, shall not in any case exceed 6.5 psi (44.8 kPa).
• Pro-Flex® and Flak Jacket
TM
can be used in combination with all approved fuel piping
materials for new construction and for replacing and retrofitting existing piping installations.
All Pro-Flex® mechanical joint fittings terminate in a standard NPT male or female pipe thread
which allows for attachment to valves, unions and couplings. However, Pro-Flex Fittings are
only to be used with Pro-Flex® and Flak Jacket
TM
CSST tubing. Inter-connection of tubing and
fittings with other CSST brands is prohibited!
• For underground burial and embedded in concrete, (CSST) flexible gas piping must be routed
within a non-metallic, water tight conduit. No mechanical joint fittings are permitted within
the conduit.
• Pro-Flex® and Flak Jacket
TM
may be connected directly to FIXED appliances
(subject to local code approval). Approved flexible appliance connectors must be used to
connect to a moveable gas appliance.
• When using Pro-Flex® flexible gas piping systems, precautions should be taken to ensure any
exposed tubing is not damaged or abused during building construction or reconstruction.
• Pro-Flex® and Flak Jacket
TM
shall not be routed into any firebox that is vented through the
roof of the structure.
Pro-Flex, LLC
877-798-6291
Hillsboro, IN 47949
ProFlexTech@ProFlexCSST.com
2
User Warnings
The installation of Pro-Flex
Stainless Steel Tubing (CSST) must be performed by a qualified
installer who has been trained in the use of the Pro-Flex®, LLC
system. The installer must also meet all qualifications required
by the state and/or local administrative authority administering
the provision of the code where gas piping is installed.
This Installation/Training Guide provides the user with a
general guidance when designing and installing fuel gas piping
systems using Pro-Flex® and Flak JacketTM CSST gas piping.
This guideline must be used in conjunction with all local
building codes. Local requirements will take precedence in the
event there is a conflict between the guideline and the local
codes. The installation shall be made in accordance with local
codes, or, in the absence of local codes, in accordance with
National Fuel Gas Code, ANSI Z223.1/NFPA 54, Natural Gas and
Propane Installation Code, CSA B149.1 & B149.2 in Canada, the
International Fuel Gas Code, the Federal Manufactured Home
Construction and Safety Standard, 24 CFR Part 3280, the
Manufactured Housing Construction and Safety Standards, ICC/
ANSI 2.0, or the Standard on Manufactured Housing, NFPA 501,
as applicable.
Special attention must be given to the proper design,
installation, testing and use of the gas piping system. Sound
engineering principles and practices must be exercised, as well
as diligent adherence to the proper installation procedures. All
installed systems must pass customary installation inspections
by the administrative authority prior to being placed in
service.
®
and Flak JacketTM Corrugated
Applicable Codes & Standards
Standards:
• ANSI LC1 / CSA 6.26 Standard for
“Fuel Gas Piping Systems Using Corrugated Stainless
Steel Tubing (CSST).”
Listings:
• CSA – CSA Group
Certificate of Compliance #1174673
• IAPMO – International Association of Plumbing &
Mechanical Officials - File #3669
Code Compliances:
• NFPA 54 /ANSI Z223.1 - National Fuel Gas Code
• ICC - International Fuel Gas Code
• ICC - International Mechanical Code
• ICC - International Building Code
• IAPMO - Uniform Plumbing Code
• IAPMO - Uniform Mechanical code
• National Standard of Canada
Natural Gas & Propane Installation Codes,
CAN/CGA-B149.1
WARNING!
Improper installation or operation of the system may result
in fire, explosion or asphyxiation. Only the components
provided or specified by Pro-Flex, LLC, for use as part of the
fuel gas system are to be used in the installation. Use of
components from other flexible gas piping systems other
than those specified as part of the Pro-Flex system is
prohibited and may result in poor performance and serious
bodily injury or property damage.
copyright 1996, 1998, 1999, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2017
by Pro-Flex, LLC
all rights reserved
Limitations of this Guide
While every effort has been made to prepare this document in
accordance with all regional model codes in effect at its
printing, Pro-Flex, LLC, cannot guarantee that the local
administrative authority will accept the most recent version of
these codes. It is the ultimate responsibility of the qualified
installer to determine suitability and acceptance of any building
components including gas piping. Pro-Flex, LLC, manufacturer
of Pro-Flex® and Flak JacketTM flexible gas piping systems
assumes no responsibility for labor or material for
installations made without prior determination of local code
authority acceptance.
3
2.0 Description of System and Components
Pro-Flex Gas Piping Systems bear the following Patents:
#5,845,946; # 5,857,716; and 6,102,445 - other patents pending.
Yellow Jacket
TM
CSST, is designed to convey all Natural and LP Gases throughout the structure and nearby outdoor appliances. All tubing is clearly
marked with the following: Brand Name, Part Number, Maximum Gas Pressure Rating [5 psi], EHD, the Standard listed to, Listing
Marks, the words Fuel Gas, and "foot marks".
4
0
T
0
0
T
3" X 7"
5
Additional Items approved as Part of the Pro-Flex® Flexible Piping System
6
7
3.0 System Configuration & Sizing
Configuration & Sizing
Prior to piping installation, refer to building
plans or prepare a sketch showing the
location of the appliances, the various
appliance load demands, point of delivery
(location of gas meter or second stage LP
regulator), and possible piping routes.
Appliance load demand data can be obtained
from the manufacturers name-plate located
on each appliance, or provided to the system
designer by the builder/contractor.
a) Determine the local piping
restrictions prior to installing the
flexible gas piping. Confirm that the
local administrative authority has
accepted the use of flexible gas
piping. Corrugated Stainless Steel
Tubing has been accepted by most
major code bodies, but local or
state adoption of these codes often
lags behind. Check with the local
administrative authority.
b) Determine metered (supply) pressure.
Natural Gas: [Check with the local gas utility to determine the pressure supplied by the meter.]
• Standard low-pressure supply throughout the USA and Canada is typically 6-7 inches water
column (also designated as 1/4 PSI or 4 ounces).
• Higher pressure supply such as 14 inches w.c. (1/2 PSI) and 2 PSI provide significant CSST size
reduction. Check with the local gas utility for the availability of elevated pressure.
Propane (Liquefied Petroleum Gas): [Check with the propane supplier to determine the pressure supplied]
• LP is typically supplied within residential buildings at 11 inches w.c. This pressure is set at the second
stage regulator.
• Elevated pressure settings from 14 inches w.c. to 2 PSI and 5 PSI also provide CSST size reductions.
Check with the propane gas supplier for available pressure.
c) Determine the total capacity needed for all appliances. CFH/BTUH equivalents for natural gas or
propane flow can be obtained from the local gas utility or propane supplier. The capacity tables within
this guide or any approved CSST tables should be used to determine pipe sizing needed to meet BTUH
input load requirements.
• For natural gas with a specific gravity of 0.60, one cubic foot per hour (1 CFH) is approximately
1,000 BTUH.
• For propane gas with a specific gravity 1.52, one cubic foot per hour (1 CFH) is approximately 2,500
BTUH.
8
3.1.a Series and Parallel (Low Pressure) Systems
DETERMINE TOTAL CAPACITY NEEDED FOR APPLIANCES.
Data can be obtained from the manufacturers nameplate located on the gas appliance. BTU equivalents for
CFH can be obtained from the local utility. In most cases, one Cubic Foot per Hour (1 CFH) is estimated to be
1,000 BTUH heating value (natural gas) and Propane has a heating value around 2,500 BTUH, making the
capacity tables easy to utilize with appliance BTU input loads.
DETERMINE THE TYPE OF PIPING LAYOUT WHICH BEST FITS THE INSTALLATION
SERIES SYSTEMS
A series layout is the most common arrangement
utilized for rigid pipe systems for low pressure.
These usually consist of a main run (header) with
tees branching off to each appliance. In a traditional
series system, the service pressure down stream of
the meter is typically less than 1/2 PSI.
The minimum pressure supplied to any given appliance is an important consideration. To operate properly, most Natural Gas appliances require a mini-
mum of 4”WC pressure and most Propane
(Liquefied Petroleum) appliances require a minimum of 10”WC pressure. Allowable pressure drop
along any particular run may be dictated by local
code restrictions.
PARALLEL SYSTEMS
In a parallel system, appliances are serviced by
individual runs that stem off from a central distribution manifold. A main run from the meter supplies
the manifold. The manifold station is located close to
the greatest load, typically the boiler or furnace. A
parallel layout is most likely to be used in 1/4 to 1/2
psi systems.
3.1.b Dual Pressure Systems
A dual pressure system incorporates two operating
pressures downstream from the meter. The first
pressure, set by the service regulator at the meter, is
usually 2 psi, but can be higher or lower depending on
code restrictions and gas company policy. This part of the
system is sized separately and ends at the pounds-toinches regulator inlet. The allowable pressure loss for
this part of the system must be added to the effect of
the regulator to determine the available pressure at the
regulator outlet. See chart page 36, Regulator Capacity
Table.
The second pressure, at the outlet of the pounds-toinches regulator is under 1/2 PSI, usually 8”WC for
natural gas and 11”WC for propane. Generally, a parallel
system requires a higher total footage of smaller
diameter tubing and fewer fittings compared to a series
layout.
MULTI-UNIT APARTMENT BUILDING
9
Multiple Manifold Systems
For those installations in which the energy load demand is large or the appliances are installed throughout
the structure with long distances from the meter, a multiple manifold system may be used. Elevated pressure
systems are a safe, efficient method of providing for larger BTU load demands while maintaining smaller pipe
diameters.
MULTIPLE MANIFOLD SYSTEMS
Combination Steel/CSST System (Hybrid)
In a hybrid system, corrugated stainless steel tubing is used in combination with rigid pipe or copper tubing. In lower pressure systems it is often
advantageous to use both CSST and rigid pipe to
help minimize pressure drops typically encountered
on systems with high loads and/or long runs.
Pro-Flex® Flexible Gas Piping systems [both Pro-Flex® & l k
Flak JacketTM] are approved for use in combination with all approved
fuel gas-piping materials by using approved pipe threads at the
interface.
Elevated Pressure System
In a complete elevated pressure system, corrugated
stainless steel tubing is used to deliver pressures in
excess of 1/2 psi to a pounds-to-inches regulator
positioned directly in front of each appliance
regulator. This is an alternate method of installation
used to minimize pressure drops typically
encountered on systems with high loads and/or long
runs.
HYBRID SYSTEM
ELEVATED PRESSURE SYSTEM
10
ALLOWABLE PRESSURE DROP:
Pro-Flex® gas piping systems [both Pro-Flex® CSST and Flak JacketTM] are required to be “tested, listed and
installed" in accordance with the ANSI/CSA standard for fuel gas piping systems using corrugated stainless steel
tubing, ANSI LC-1/ CSA 6.26. This standard, among other things, requires the manufacturer to provide installation
instructions including the necessary pipe sizing tables and methods.
With respect to gas piping sizing, the intent of all model codes is to ensure there is sufficient gas volume and
gas pressure supplied to the appliance for proper operation. Language from the International Fuel Gas Code clearly
illustrates this point.
“Allowable pressure drop - The design pressure loss on any piping system under maximum probable flow conditions,
from point of delivery to the inlet connection of the equipment, shall be such that the supply pressure at the
equipment is greater than the minimum pressure required for proper equipment operation.”
Natural gas appliances are typically designed to operate with a minimum inlet pressure of 4.0 inches water
column. Propane appliances are typically designed to operate with a minimum inlet pressure of 10.0 inches water column.
The natural gas capacity tables published by Pro-Flex, LLC, for use with Pro-Flex® and Flak JacketTM CSST, shall be used
to provide for no less than 5” water column pressure to the appliance inlet. The propane capacity tables shall be used to
provide no less than 10.5” water column pressure to the appliance inlet.
This can be done by subtracting the desired appliance inlet pressure (5” WC for NG, 10.5” WC for LPG) from the
gas source pressure (gas meter for NG, second stage regulator for LPG) to get allowable pressure drop. Use the
Pro-Flex® capacity table labeled with the appropriate allowable pressure drop and gas type. This will result in an
additional pressure drop capacity over the commonly used 1/2” WC drop associated with the Longest Run
Method.
Allowable Pressure Drop along any particular run may be dictated by local codes.
Reference Data for Proper System Sizing:
PRESSURE CONVERSION FACTORS FUEL GAS INFORMATION
1/4 psi = 6.921 in w.c. = (approx. 7” WC) Natural Gas Propane
1/2 psi = 13.842 in w.c. = (approx. 14” WC) BTU per Cubic Foot = 1000 2516
1 psi = 27.684 in w.c. = (approx. 28” WC)
2 psi = 55.368 in w.c. = (approx. 56” WC)
5 psi = 138.42 in w.c. = (approx. 140” WC)
Specific Gravity =
Note: to determine the CFH of Natural Gas,
divide by BTU load by 1000. To determine the
CFH of Propane, divide the BTU by 2516
0.60 1.52
11
3.2 Sizing Methods and Examples
SIZING PROCEDURES FLAK JACKETTM & PRO-FLEX® CSST, FLEXIBLE GAS TUBING
LONGEST LENGTH METHOD EXAMPLE #1
This is a low-pressure series system with four natural gas appliances. The utility company
supply pressure exiting the meter is 6 inches water column, and the maximum allowable
pressure drop across the longest length from the meter to the farthest appliance is 1/2 inch
water column. The gas supplied has a specified gravity of .60 and an energy content of 1 cubic
foot per hour equals 1,000 BTU per hour.
APPLIANCE LOADS +GAS LOAD LENGTH OF RUN
FURNACE 75 CFH (75,000 BTUH/1000 PER CFH) 14 FEET
OVEN/RANGE 45 CFH (45,000 BTUH/1000 PER CFH) 20 FEET
DRYER 25 CFH (25,000 BTUH/1000 PER CFH) 38 FEET
ATER HEATER 24 CFH (24.000 BTUH/1000 PER CFH) 50 FEET
W
TOTAL..................................................169 CFH
LENGTH OF EACH RUN
A = 8 FEET EXAMPLE:
B = 10 FEET Furnace: A (8 ft) + F (6 ft) = 14 FEET
C = 12 FEET Oven/Range: A (8 ft) + B (10 ft) + E (2 ft) = 20 FEET
D = 20 FEET Dryer: A (8 ft) + B (10 ft) + C (12 ft) + G (8 ft) = 38 FEET
E = 2 FEET Water Heater: A (8 ft) + B (10 ft) + C (12 ft) + D (20 ft) = 50 FEET
F = 6 FEET THE LONGEST RUN IS FROM THE METER TO THE WATER HEATER; OVER 50 FEET.
G = 8 FEET
SIZING SECTION A:
Length A must be sized to handle the total load of all appliances and the total pressure drop from the meter to the farthest appliance. The total
appliance load is 169 CFH. Using the longest length sizing method, the length is 50 ft. to the water heater. Referring to Table 1, (6" WC inlet
pressure and 1/2" WC pressure drop) under the 50 ft. length column, we find that 1 inch size has the flow capacity exceeding 169 CFH (171 CFH).
Use 1" tubing to run Section A.
SIZING SECTION B:
Section B must supply the water heater, dryer and range. The total pressure drop for the system is considered to be from the meter to the water
heater (farthest appliance). The total appliance load is 24+25+45 = 94 CFH. Using the longest length sizing method, the length is 50 ft. (distance
from meter to water heater). Referring to Table 1 under the 50 ft. length column, we find that size 1 inch has flow capacity over 94 CFH (171 CFH).
Use 1" tubing to run Section B.
SIZING SECTION C:
Section C must supply the water heater and dryer. The total appliance load is 24+25 = 49 CFH. Using the longest length method, the length is 50
ft. Referring to Table 1 under the 50 ft. length column, we find that 3/4 inch has flow capacity above the 49 CFH (89 CFH) Use 3/4" tubing to run
Section C.
SIZING SECTION D:
Section D must supply the water heater. The total appliance load is 24 CFH. Using the longest method, the length is 50 ft. Referring to Table 1
under the 50 ft. length column, we find that 1/2 inch has flow capacity above 24 CFH (32 CFH). Use 1/2" tubing to run Section D.
SIZING SECTION E:
The total appliance load is 45 CFH. Using the longest length method, the length is 50 ft. Referring to Table 1 under 50 ft. length column, we find
that 3/4" has flow capacity above 45 CFH (89 CFH) Use 3/4" tubing to run Section E.
SIZING SECTION F:
The total appliance load is 75 CFH. Using the longest length method, the length is 50 ft. Referring to Table 1 under 50 ft. length column, we find
that 3/4" has flow capacity above 75 CFH (89 CFH) Use 3/4" tubing to run Section F.
SIZING SECTION G:
The total appliance load is 25 CFH. Using the longest length method, the length is 50 ft. Referring to Table 1 under 50 ft. length column, we find
that 1/2" has flow capacity above 25 CFH (32 CFH) Use 1/2" tubing to run Section G.
12
EXAMPLE #2, MEDIUM PRESSURE PARALLEL SYSTEM
This is a medium-pressure parallel system which includes a
distribution tee manifold. The natural gas supply pressure is 1/2 psig
and the maximum allowable pressure drop from the meter to the
farthest appliance is 6" WC.
Appliance
Loads Lengths size
Medium Pressure (1/2 psig) Natural Gas (Parallel System)
Oven/Range 45 CFH B= 20 FT 3/8"
Furnace = 75 CFH C = 5 FT 3/8"
Dryer = 25 CFH D = 35 FT 3/8"
Water Heater = 24CFH E = 50 FT 3/8"
TOTAL CFH.... 169 CFH
A = 10 FT 3/4"
SIZING, SECTION A:
Determine distance from the meter to the farthest appliance (water heater 60 ft.) Determine the total appliance
load supply by Section A (169 CFH). Referring to Table 4 under the 60 ft. length column, we find 3/4 inch has flow
capacity above 169 CFH (274 CFH). Use 3/4" tubing to run Section A.
SIZING SECTION B:
Section B supplies the oven/range. The total pressure drop is considered from the meter to the oven/range. The
total appliance load is 45 CFH and the length is 10 ft + 20 ft. = 30 feet total. Referring to Table 4 under the 30 ft.
length col-umn, we find that 3/8 inch has a flow capacity above 45 CFH (94 CFH). Use 3/8" tubing to run Section B.
SIZING SECTION C:
Section C supplies the furnace. The total appliance load is 75 CFH and the total length is 10 ft. + 5 ft. = 15 ft total.
Referring to Table 4 under the 15 ft. length column. We find that 3/8 inch has a flow capacity above
75 CFH (134 CFH) Use 3/8" tubing to run Section C.
SIZING SECTION D:
Section D supplies the dryer. The total appliance load is 25 CFH and the total length from the meter is
10 ft. + 35 ft. = 45 feet total. Referring to Table 4 under the 45 ft. length column. Since 45 ft. does not appear in the
table, use the next longest run column of 50 ft. We find that 3/8 inch has a flow capacity above 25 CFH (73 CFH)
Use 3/8” tubing to run Section D.
SIZING SECTION E:
Section E supplies the water heater. The total appliance load is 24 CFH and the total length from the meter to
appliance is 10 ft + 50 ft = 60 feet total. Referring to Table 4 under the 60 ft. length column, we find that 3/8 inch
has a flow capacity above 24 CFH (65 CFH) Use 3/8" tubing to run Section E.
13
EXAMPLE #3 - ELEVATED DUAL PRESSURE SYSTEM
This is a 2 psig supply pressure parallel arrangement. The natural gas
system incorporates a pressure reducing regulator with a
distribution tee manifold located closely to several large capacity
appliances. The inlet pressure downstream of the meter is 2 psig,
and the designated maximum pressure drop from the meter to the
reducing regulator is 1.0 psig. The outlet pressure from the
regulator is set at 8 inches water column. A 3" WC pressure drop is
used in sizing the tubing from the regulator outlet to each
appliance. Specific gravity of the gas delivered is .60 and energy
content is 1 CFH = 1,000 BTUH.
Elevated (2 psig) Dual Pressure Natural Gas (Parallel System)
Total load and regulator size:
Calculate the total appliance load and determine if
one regulator has sufficient capacity to supply this
load. One regulator is normally adequate when
appliances are close together. When groups of
high-load appliances are widely separated, it is
often more economical to use one pressure
reducing regulator to supply each appliance group.
The total appliance load required is 169 CFH
(169,000 BTUH).
The supply pressure from the meter is 2
psig and the designated pressure drop from the
meter to the regulator is 1 psig; thus the
minimum inlet pressure to the regulator is 1 psig. Since the outlet pressure of the regulator is set at 8" WC, the expected pressure drop
across the regulator is 20 inches WC (1 psig - 8" WC = 20" WC). A single 325-3 regulator has a flow rate capacity of 252 CFH. This capacity
exceeds the system requirement of 169 CFH. In cases where the 325-3 regulator capacity is insufficient, a larger #325-5A regulator or parallel
arrangement of two regulators should be used.
APPLIANCE LOADS LENGTHS TUBE SIZE
METER TO REGULATOR A= 10 FEET 3/8"
OVEN/RANGE = 45 CFH B = 20 FEET 3/8"
FURNACE = 75 CFH C = 5 FEET 3/8"
DRYER = 25 CFH D = 35 FEET 3/8"
WATER HEATER=24 CFH E = 50 FEET 3/8"
TOTAL...........................................169 CFH
SIZING SECTION A (METER TO REGULATOR):
Section A must be sized to handle all appliances loads and supply the pressure reducing (pounds to inches) regulator. The total load is 169
CFH and the length is 10 ft. The supply pressure is 2 psig and the pressure drop is 1 psig. Referring to Table 5 (meter to regulator with 2 psig
inlet and 1 psig drop) under the 10 ft. column, we find that 3/8 inch has capacity over 169 CFH (332 CFH). Use 3/8" tubing to run Section A.
To size the other sections, the pressure source is the outlet of the pressure regulator rather than the meter. Use the low-pressure Table 3
(8.0" WC inlet with 3.0" WC drop) and size each section individually using the appliance load and run distance.
SIZING SECTION B
Section B supplies the oven/range. The load is 45 CFH and the distance between the regulator outlet and appliance is 20 ft. The total pressure
drop is from the outlet of the reducing regulator to the oven/range. The outlet pressure from the regulator is 8" WC and the pressure drop is
3" WC. Referring to Table 3, under the 20 ft. length column, we find that an 8 inch has a flow capacity above 45 CFH (81 CFH). Use 3/8" tubing
to run Section B.
SIZING SECTION C:
Section C supplies the furnace. The load is 75 CFH and the distance is 5 ft. Referring to Table 3, under the 5 ft. length column, we find that 3/8
inch has a flow capacity above 75 CFH (162 CFH). Use 3/8" tubing to run Section C.
SIZING SECTION D:
Section D supplies the dryer. The load is 25 CFH and the distance is 35 ft. Referring to Table 3, and since a 35 ft. length column does not exist,
use the 40 ft. length column. We find that 318 inch has a flow capacity above 25 CFH (58 CFH). Use 3/8" tubing to run Section D.
SIZING SECTION E:
Section E supplies the water heater. The load is 24 CFH and the distance is 50 ft. Referring to Table 3, under the 50 ft. length column, we find
that 3/8 inch has a flow capacity above 24 CFH (51 CFH). Use 3/8" tubing to run Section E.
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COMBINATION STEEL/ CSST (Hybrid System)
(Hybrid system)
It is often to your advantage to use
both CSST and rigid pipe to help
minimize pressure drops typically
encountered on systems with high
loads and/or long runs. Flexible gas
piping systems by Pro-Flex, LLC [both
Pro-Flex®CSST and Flak JacketTM] are
approved for use in combinations
with approved gas piping materials
by using approved pipe threads at
the interface. For sizing use longest
run method assuming the complete
run is CSST.
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