Re: New Gas Line for a Pool Heater
Posted by Dale's Plumbing Service LMP on February 18, 19100 at 19:34:24:
In response to Re: New Gas Line for a Pool Heater
: I recently bought a 400,000 BTU Pool heater. I'm planning to run a 1" black pipe from the meter to crawl space then to the outside again(doing a shorcut). Do I need to bury lenght of the pipe in crawl space? What is the minimum depth should I bury the pipe thats outside the house. Is one inch pipe sufficient enough. Heater requires 1000 btu/hr WC 7"min
: maximum 14 WC.

: Any tips will be appreciated.
: Please help.

Hope this tip helps; Dale's Plumbing Service LMP

1210.0 Material For Gas Piping
1210.1 All Pipe Used For The Installation, Extension, Alteration, Or Repair Of
Any Gas Piping Shall Be Standard Weight Wrought Iron Or Steel (Galvanized
Or Black) Or Yellow Brass (Containing Not More Than Seventy-Five (75) Percent
Copper). Approved Pe Pipe May Be Used In Exterior Buried Piping Systems.

1210.2 All Such Pipe Shall Be Either New, Or Shall Previously Have Been
Used For No Other Purpose Than Conveying Gas; It Shall Be In Good Condition
And Free From Internal Obstructions. Burred Ends Shall Be Reamed To The Full
Bore Of The Pipe.

1210.3 All Fittings Used In Connection With The Above Piping Shall Be Of
Malleable Iron, Yellow Brass (Containing Not More Than Seventy-Five (75)
Percent Copper), Or Approved Plastic Fittings.

1210.4 All Valves And Appurtenances Used In Connection With The
Above Piping Shall Be Of A Type Designed And Approved For Use With Fuel

1210.5 Valves Up To And Including Two (2) Inches Shall Be Brass
Or Other Approved Material.

1211.0 Installation Of Gas Piping

1211.1 All Joints In The Piping System, Unless Welded, Shall Be Screwed
Joints, Having Approved Standard Threads. Such Screwed Joints Shall Be Made
Up With Approved Pipe Joint Material, Insoluble In The Presence Of Fuel Gas
And Applied To The Male Threads Only.

1211.2 All Welded Joints In The Piping System Shall Be Welded By A
Certified Pipeline Welder As Defined In Chapter 2 (See Welder, Pipe).

1211.3 No Gas Piping Shall Be Installed In Or On The Ground Under Any
Building Or Structure And All Exposed Gas Piping Shall Be Kept At
Least Six (6)Inches Above Grade Or Structure. The Term'Building Or
Structure"Shall Include Structures Such As Porches And Steps, Whether
Covered Or Uncovered, Breezeways, Roofed Porte-Cocheres, Roofed Patios,
Carports,Covered Walks, Covered Driveways, And Similar Structures Or
Concealed Unprotected Gas Piping May Be Installed Above Grade In
Approved Recesses Or Channels. Exception: When Necessary Due To
Structural Conditions, Approved Type Gas Piping May Be Installed In
Other Locations, When Permission Has First Been Obtained From The
Administrative Authority.

1211.4 Where Water Vapor Is Present In The Fuel Gas Served, Accessible
Drip Pipes Shall Be Provided At Points Where Condensation Will Tend To

1211.5 Ferrous Gas Piping Installed Underground In Exterior
Locations Shall Be Protected From Corrosion By Approved Coatings Or Wrapping
Materials Or By Any Other Approved Manner. All Horizontal Metallic
Piping Shall Have At Least Twelve (12) Inches Of Earth Cover Or Other
Equivalent Protection.
Plastic Gas Piping Shall Have At Least Eighteen (18) Inches Of Earth
Cover Or Other Equivalent Protection. Risers, Including
Prefabricated Risers Inserted With Plastic Pipe, Shall Be Metallic And
Shall Be Wrapped Or Coated To A Point At Least Six (6) Inches Above
Grade Or Protected In An Approved Manner. When A Riser Connects
Underground To Plastic Pipe, The Underground Horizontal Metallic Portion
Of The Riser Shall Extend At Least Thirty (30) Inches) Before Connecting
To The Plastic Pipe By Means Of An Approved Transition Fitting Or Adapter.
Exception: Listed One-Piece Ninety (90) Degree Transition Fittings Or
Risers May Have Less Than Thirty (30) Inches (0.8 In) Of Horizontal
Metallic Piping.

1211.7 All Gas Pipe Protective Coatings Shall Be Approved Types,
Machine Applied, And Conform To Recognized Standards (Table 14-1). Field
Wrapping Shall Provide Equivalent Protection And Is Restricted To Those
Fittings And Short Sections Where The Factory Wrap Has Been Damaged Or
Necessarily Stripped For Threading Or Welding. Field Wrapping Shall
Conform To The Requirements Of Iapmo Installation Standard-I$-13.
Zinc Coatings (Galvanizing) Shall Not Be Deemed Adequate Protection
For Gas Piping Below Ground. Ferrous Metals In Exposed Exterior
Locations Shall Be Protected From Corrosion In A Manner Satisfactory To
The Administrative Authority. Inspection And Repair Shall Conform To
Iapmo Installation Standard Listed In Table 14-1.

1211.8 All Gas Piping Shall Be Adequately Supported By Metal Straps Or
Hooks At Intervals Not To Exceed Those Shown In Table 12-2. Gas Piping
Installed Below Grade Shall Be Effectively Supported At All Points On
Undisturbed Or Well Compacted Soil Or Sand.

1211.9 Gas Piping Supplying More Than One (1) Building On Any One (1)
Premises Shall Be Equipped With Separate Shutoff Valves To Each Building, So
Arranged That The Gas Supply Can Be Turned On Or Off To Any Individual Or
Separate Building. Such Shutoff Valve Shall Be Located Outside The
Building Supplies And Shall Be Readily Accessible At All Times. Buildings
Accessory To Single Family Residences Are Exempt From The Requirements
Of This Subsection.

1211.10 Where Unions Are Necessary,Right And Left Nipples And
Couplings Shall Be Used. Ground-Joint Unions May Be Used At Exposed Fixture,
Appliance, Or Equipment Connections And In Exposed Exterior Locations
Immediately On The Discharge Side Of A Building Shutoff Valve. Heavy Duty
Flanged Type Unions May Be Used In Special Cases, When First Approved By
The Administrative Authority. Bushings Shall Not Be Used In Concealed

1211.11 When Air, Oxygen, Or Other Special Supplementary Gas Under
Pressure Is Introduced With The Regularly Supplied Gas, Either Directly Into
The Gas Piping System Or At Burners, A Device Approved By The
Administrative Authority And The Serving Gas Supplier Shall Be Installed To
Prevent Backflow Of Such Special Gas Into The Gas Piping System Or Serving
Gas Supplier'S Meter. This Device Shall Be Located Between The Source Of The
Special Gas And The Serving Gas Supplier'S Meter And Shall Be On The Gas Line
Leading To The Appliance Using The Special Gas. This Device May Be Either A
Spring Loaded Or Diaphragm Type Check Valve And Shall Be Capable Of

Fuel Piping 1211.12 - 1212.0
Withstanding Any Pressure Which May Be Imposed On It.

1211.12 When Liquefied Petroleum Or Other Standby Gas Is
Interconnected With The Regular Gas Piping System, An Approved
Three-Way Two-Port Valve Or Other Adequate Safeguard Acceptable
To The Administrative Authority And The Serving Gas Supplier Shall
Be Installed To Prevent Backflow Into Either Supply System.

1211.13 Valves Used In Connection With Gas Piping Shall Be Approved
Types And Shall Be Accessible.

1211.14 All Gas Outlets Located In A Barbecue Or Fireplace Shall Be
Controlled By An Approved Operating Valve Located In The Same Room And
Outside The Hearth, But Not More Than Four (4) Feet (1.2 M) From Such Outlets.
When Piping On The Discharge Side Of Any Such Control Valve Is Standard
Weight Brass Or Galvanized Steel, Such Piping May Be Embedded In Or
Surrounded By Not Less Than Two (2) Inches Of Concrete Or Masonry.

1211.15 An Accessible Shutoff Valve Of A Type Set Forth In Section
1211.13,Shall Be Installed In The Fuel Supply Piping Outside Of Each
Appliance And Ahead Of The Union Connection Thereto, And In Addition To
Any Valve On The Appliance. Shutoff Valves Shall Be Within Three (3) Feet
Of The Appliance. Shutoff Valves May Be Located Immediately Adjacent
To And Inside Or Under An Appliance When Placed In An Accessible And
Protected Location And When Such Appliance May Be Removed Without Removal
Of The Valve. Shutoff Valves May Be Accessibly Located Inside Wall
Heaters And Wall Furnaces Listed For Recessed Installation Where Necessary
Maintenance Can Be Performed Without Removal Of The Shutoff Valve.

1211.16 An Electrically Continuous Insulated Number 18 Copper
Tracer Wire Or Other Approved Materials Shall Be Installed With And
Attached To Underground Non-Metallic Gas Piping And Shall Terminate Above
Grade At Each End.

1211.17 Changes In Direction Of Gas Piping Shall Be Made By
Appropriate Use Of Fittings, Except Pe Gas Pipe And Tubing May Be
Bent To A Radius Of Not Less Than Twenty (20) Times The Nominal
Pipe Or Tubing Diameter.

1212.0 Appliance Connectors
Appliance Connections Shall, At No Time, Have A Diameter Less Than
That Of The Inlet Connection To The Appliance As Provided By The
Manufacturer And Each Appliance Shall Be Rigidly Connected To The Gas
Piping With Materials As Provided In Section 1210,0.
Exception: A Gas Appliance May Be Connected With An Approved Listed
Metal Appliance Connector Under The Following Conditions:
(1) Listed Metal Appliance Connectors Shall Have An Overall Length
Of Not To Exceed Three (3) Feet Except A Range Or Dryer Connector,
Which May Not Exceed Six (6) Feet .
(2) No Part Of Such Connector Shall Be Concealed Within Or Extended
Through Any Wall, Floor, Partition, Or Appliance Housing.
(3) A Listed Accessible Appliance Connector Valve Not Less Than The
Nominal Size Of The Connector Shall Be Provided At The Gas Piping
Outlet Immediately Ahead Of The Connector.
(4) All Connectors Shall Be Of Such Size As To Provide The Total
Demand Of The Connected Appliance Based On The Applicable Tables 12-9 Or
(5) Aluminum Alloy Connectors May Be Used Only In Interior
Locations Where They Shall Not Be In Contact With Masonry, Plaster, Or
Or Are Not Subject To Repeated Corrosive Wettings.
(6) The Connection Of An Indoor Appliance With Any Type Of Gas Hose
Is Prohibited, Except When Used With Laboratory Or Shop Equipment Or
Equipment That Requires Mobility During Operation.. Such
Connections Shall Have The Shut-Off Or Stopcock Installed At The
Connection To The Building Piping. When Gas Hose Is Used, It Shall Be
Of The Minimum Practical Length, But Not To Exceed Six (6) Feet,
Except For Hand Torches And Special Mobile Equipment, And Shall Not
Extend From One Room To Another Nor Pass Through Any Walls, Partitions,
Ceilings,Or Floors. Under No Circumstances Shall Gas Hose Be Concealed From
View Or Used In A Concealed Location. Only Listed Gas Hose Shall Be Used
And Only In Accordance With Its Listing. Gas Hose Shall Not Be Used
Where It Is Likely To Be Subjected To Excessive Temperatures (Above 125'F
Nor Shall It Be Used As A Substitute For A Standard Appliance Connector.
(7) Outdoor Portable Appliances May Be Connected With An Approved
Outdoor Hose Connector Not To Exceed Fifteen (15) Feet In Length
Provided It Connects Outdoors To Approved Gas Piping Including An
,Approved Valve At The Inlet Of The Hose Connector.
(8) Appliances May Be Connected To The Fuel Gas Piping By Means Of
An Approved Listed Quick-Disconnect Device.

1213.0 Liquified Petroleum Gas Facilities And Piping
In Addition To The Requirements Of This Code For Gas Piping, The
Facilities And Piping For Use With Liquefied Petroleum Gas Shall Meet
The Following Requirements:
1213.1 All Liquefied Petroleum Gas Facilities Shall Conform To Applicable
Standards Of Table 14-1 Or To Other Approved Standards. All Such Facilities
And Their Locations Shall Be Acceptable To The Administrative Authority And
Shall Conform To State And Local Fire Prevention Regulations.
1213.2 Where Liquefied Petroleum Gas Facilities Serve More Than One (1)
Customer Through Separate Piping Systems, Each System Shall Be Identified
In A Manner Satisfactory To The Administrative Authority And The Gas
1213.3 All Liquefied Petroleum Gas Facilities Shall Be So Placed As To Be At Al
Times Readily Accessible For Inspection, Reading, Testing, And Shutting Off The
Gas Supply. All Service Piping And Main Supply Shutoff Valves Shall Be
Outside Of The Building. All Main Supply Valves Shall Be Of Approved Type
And Readily Accessible.
1213.4 In Order That Gas May Be Supplied, The Gas Piping Inlet Shall Be
Located With Respect To The Proposed Liquefied Petroleum Gas Facility Location
In Accordance With The Requirements Of This Section And The Supplier'S
1213.5 Liquified Petroleum Gas Facilities Shall Not Be Located In Any Pit Or
Basement, Under Show Windows Or Interior Stairways, In Engine, Boiler,
Heater, Or Electric Meter Rooms. When Not Prohibited By Another Regulation,
Approved Liquefied Petroleum Gas Metering Devices May Be Located In The
Open Under Exterior Stairways.
1213.6 Liquified Petroleum Gas Piping Shall Not Serve Any Gas Water Heater
Located In A Pit Or Basement Where Heavier Than Air Gas Might Collect To Form
A Flammable Mixture.
1213.7 Pipe Joint Compounds Used On Thread Connections Shall Be Insoluble
In Liquefied Petroleum Gas.
1213.8 Every Valve And Appurtenance Used On Such Piping Shall Be
Designed And Approved For Use With Liquefied Petroleum Gas.
1213.9 Discharge From Relief Valves Shall Be Into Open Air And Shall Not Be
Less Than Five (5) Feet Horizontally Away From Any Opening Into A
Building Which Is Below Such Discharge.

1214.0 Leaks
1214.1 Leaks In Gas Piping Shall Be Located By Applying Soapy Water To The
Exterior Of The Piping.
1214.2 Fire Or Acid Shall Not Be Used To Locate Or Repair Leaks, Nor Shall Any
Substance Other Than Air Be Introduced Into The Gas Piping.
1214.3 It Shall Not Be Permissible To Repair Defects In Gas Piping Or Fittings,
But Upon Having Been Located, The Defective Pipe Or Fitting Shall Be Removed
And Replaced With Sound Material.

1215.0 Interconnections Of Gas Piping Systems
1215.1 It Shall Be Unlawful To Connect Any Gas Appliance In Such A Manner
That Such Appliance May Receive Gas From More Than One (1) System Of Gas
1215.2 The Installation, Use, Or Maintenance Of A Gas Valve Which Makes It
Possible To Turn On, Control, Or Otherwise Direct The Flow Of Gas From One
(1) System Of Gas Piping To Another, Where Such Systems Are Supplied With
Gas From Separate Meters, Is Hereby Prohibited, And Any Such Valves Or Other
Interconnection Between Separate Systems Of Gas Piping Shall Be Removed
Upon Order Of The Administrative Authority.

1216.0 Required Gas Supply
1216.1 The Following Regulations, As Set Forth In This Section And In

1217.0, Required Gas Piping Size, Shall Be The Standard For The
Installation Of Gas Piping. All Natural Gas Regulations And Tables Are
Based On The Use Of Gas Having A Specific Gravity Of Sixty Hundredths (0.60),
Supplied At Six (6) To Eight (8) Inches Water Column Pressure At The
Outlet Of The Meter. For Undiluted Liquefied Petroleum Gas, Gas Piping May
Be Sized For 2500 Btu Per Cubic Foot (25.9 Watt-Hours/L) At Eleven (11)
Inches Water Column And Specific Gravity Of One And Fifty-Two Hundredths
Note: Where Gas Of A Different Specific Gravity Is To Be Delivered, The
Serving Gas Supplier Should Be Contacted For Specific Gravity Conversion
Factors To Use In Sizing Piping Systems From The Pipe Sizing Tables In This
Chapter.1216.2 The Hourly Volume Of Gas Required At Each Piping Outlet Shall
Be Taken As Not Less Than The Maximum Hourly Rating As Specified By The
Manufacturer Of The Appliance Or Appliances To Be Connected To Each Such
1216.3 Where The Gas Appliances To Be Installed Have Not Been Definitely
Specified, Table 12-1 May Be Used As A Reference To Estimate Requirements Of
Typical Appliances. To Obtain The Cubic Feet Per Hour (L/Sec.) Of Gas
Required, Divide Input Of Appliances By The Average Btu (W) Heating Value
Per Cubic Foot (L) Of The Gas. 'The Average Btu (W) Per Cubic Foot (L) Of
The Gas In The Area Of The Installation May Be Obtained From The Serving
Gas Supplier.
1216.4 The Size Of The Supply Piping Outlet For Any Gas Appliance Shall Not
Be Less Than One-Half (1/2) Inch (12.7 Mm).
The Minimum Size Of Any Piping Outlet For A Mobile Home Shall Be
Three-Quarter (3/4) Inch .

1217.0 Required Gas Piping Size
1217.1 Where The Maximum Demand Does Not Exceed Two Hundred Fifty
(250) Cubic Feet Per Hour (2 L/Sec.) And The Maximum Length Of Piping
Between The Meter And The Most Distant Outlet Is Not Over Two Hundred Fifty
(250) Feet (76 M), The Size Of Each Section And Each Outlet Of Any System Of Ga
Piping Shall Be Determined By Means Of Table 12-3. Other Systems Within
The Range Of Table 12-3 May Be Sized From That Table Or By Means Of The
Methods Set Forth In Section 1217.3.
1217.2 To Determine The Size Of Each Section Of Pipe In Any System Within
The Range Of Table 12-3, Proceed As Follows:
(1) Measure The Length Of The Pipe From The Gas Meter Location To The
Most Remote Outlet On The System.
(2) In Table 12-3 Select The Column Showing That Distance, Or The Next
Longer Distance If The Table Does Not Give The Exact Length.
(3) Starting At The Most Remote Outlet, Find In The Vertical Column Just
Selected The Gas Demand For That Outlet. If The Exact Figure Of Demand Is
Not Shown, Choose The Next Larger Figure Below In The Column.
(4) Opposite This Demand Figure, In The First Column At The Left In Table
12-3 Will Be Found The Correct Size Of Pipe.
Fuel Piping 1217.2 - 1218.4

(5) Using This Same Vertical Column, Proceed In A Similar Manner For
Each Section Of Pipe Serving This Outlet. For Each Section Of Pipe,
Determine The Total Gas Demand Supplied By That Section. Where Gas
Piping Sections Serve Both Heating And Cooling Equipment And The
Installation Prevents Both Units From Operating Simultaneously, Only The
Larger Of The Two Demand Loads Need Be Used In Sizing These Sections.
(6) Size Each Section Of Branch Piping Not Previously Sized By
Measuring The Distance From The Gas Meter Location To The Most Remote
Outlet In That Branch And Follow The Procedures Of Steps 2, 3, 4, And 5
Note: Size Branch Piping In The Order Of Their Distance From The Meter
Location, Beginning With The Most Distant Outlet Not Previously Sized.
1217.3 For Conditions Other Than Those Covered By Section 1217.1, Such As
Longer Runs Or Greater Gas Demands, The Size Of Each Gas Piping System Shall
Be Determined By Standard Engineering Methods Acceptable To The
Administrative Authority And Each Such System Shall Be So Designed That
The Total Pressure Drop Between The Meter Or Other Point Of Supply And Any
Outlet When Full Demand Is Being Supplied To All Outlets, Will At No Time
Exceed Five-Tenths (0.5) Inches (12.7 Mm) Water Column Pressure.
1217.4 Where The Gas Pressure May Be Higher Than Fourteen (14) Inches
(355.6 Mm) Or Lower Than Six (6) Inches Of Water Column, Or
When Diversity Demand Factors Are Used, The Design, Pipe, Sizing, Materials,
Location, And Use Of Such Systems First Shall Be Approved By The
Administrative Authority. Piping Systems Designed For Pressures Higher
Than The Serving Gas Supplier'S Standard Delivery Pressure Shall Have Prior
Verification From The Gas Supplier Of The Availability Of The Design Pressure.
Systems Using Undiluted Liquefied Petroleum Gas May Be Sized Using Table
12-7 For Eleven (11) Inches (279.4 Mm) Water Column And In Accordance With
The Provisions Of Sections 1217.1 And 1217.2.

1218.0 Medium Pressure Gas Piping Systems

1218.1 Medium Pressure - Pressure Over Fourteen (14) Inches (355.6 Mm)
Of Water Column But Riot To Exceed Five (5) Psig (34.5 Kpa). Second Stage
Pressure - Used In Liquefied Petroleum Gas Systems. Pressure Over Fourteen
(14) Inches (355.6 Mm) Of Water Column But Not To Exceed Twenty (20) Psig
(137.8 Kpa).

1218.2 Approval Of The Administrative Authority And Verification From The
Serving Gas Supplier Of The Availability Of The Desired Pressure Shall Be
Obtained Before Any Medium Pressure Gas Piping System Is Installed.
1218.3 The Following Shall Apply To Medium Pressure Gas Piping Systems
In Addition To The Other Requirements Of This Chapter.

1218.4 Approved Regulators Shall Be Installed On Medium Pressure Gas
Piping Systems, In Approved Locations And Shall Be Accessible For Servicing.
Each Regulator Shall Have A Separate Vent To The Outside.

Exceptions: Pounds (Kg) To Inches (Mm) Water Column Regulators
Equipped With Limiting Orifices Capable Of Releasing Not More Than Five
(5) Cubic Feet Of Gas Per Hour (0.04 L/Sec.), When Supplied With Medium
Pressure, Need Not Be Vented To An Outside Location When Such
Regulators Have Been Approved By The Administrative Authority And The
Serving Gas Supplier. These Regulators Shall:
(1) Be Connected To The Same Piping Material Used To Pipe The Structure.
A Listed Gas Connector May Be Used To Attach The Low Pressure Piping
Downstream Of The Regulator To The Appliance Manifold.
(2) Have An Approved Gas Valve In The Supply Line Upstream Of The
Pounds (Kg) To Inches (Mm) Water Column Regulator.
(3) Be Accessible.
(4) Have The Upstream Pressure Identified. Such Identification Shall Be
A Metal Tag Permanently Attached To The Regulator And State: "Warning:
1/2 To 5 Pounds (3.4-34.5 Kpa) Natural Gas Pressure. Do Not
(5) Be Installed In A Location That Communicates With A Ventilated Area.

1218.5 An Approved Gas Valve Shall Be Installed Immediately Preceding
Each Regulator. All Regulators That May Be Subjected To Mechanical Damage
Shall Be Substantially Protected To The Satisfaction Of The Administrative

1218.6 Tables ]?-5 And 12-6 May Be Used To Size Natural Gas Piping System
Carrying Three (3) Or Five (5) Psig (20.7 Or 34.5 Kpa) Gas. The Procedure To
Determine The Size Of Each Section Of The System Is Similar To That Contained
In Section 1217.0 Using The Pipe Length From The Meter To The Most Remote
Regulator On The Medium Pressure System And Sizing The Downstream Low
Pressure Piping From Table 12-3.

1218.7 Table 12-8 May Be Used To Size Undiluted Liquefied Petroleum Gas
Piping Systems Carrying Ten (10) Psig (68.9 Kpa) Gas. The Procedure To
Determine The Size Of Each Section Of The System Is Similar To Section 1217.0
Using The Pipe Length From The First Stage Or Tank Regulator To The Most
Remote Regulator In The Second State System. Low Pressure Piping To Be Sized
From Table 12-7.

1218.8 Buried Medium Pressure Gas Piping Shall Be Protected From
Corrosion As Required By Chapter 12 And Shall Have A Minimum Earth Cover
Of Eighteen (18) Inches . Such Piping Shall Be Covered With At Least Six
(6) Inches Of Hand Placed Selected Backfill Devoid Of Rocks,
Building Materials, Or Other Matter That May Damage The Pipe Or Wrapping.


Table 12-1
Minimum Demand Of Typical Gas Appliances In Btus (Watts) Per Hour

Demand In
Appliance Btu/H Watts/H
Barbecue (Residential).. 50,000 14,050
Bunsen Burner................ 3,000 879
Domestic Clothesdryer........ 35,000 10,255
Domestic Gas Range......... 65,000 19,045
Domestic Recessed Oven Section........ 25,000 7,325
Domestic Recessed Top Burner Section......... 40,000 11,720
Fireplace Log Lighter (Commercial)........ 50,000 14,650
Fireplace Log Lighter (Residential).......... 25,000 7,325
Gas Engines (Per Horsepower)........... 10,000 2,930
Gas Refrigerator.................. 3,000 879
Mobile Homes (See Appendix E)
Steam Boilers(Per Horsepower)................ 50,000 14,650
Storage Water Heater
Up To 30 Gallon (114l)....................... 30,000 8,790
Storage Water Heater
40 (151 L) To 50 Gallon (189 L) Tank... 50,000 14,650

Table 12-2
Support Of Piping

Size Of Pipe
Inches Mm
1/2 12.7
3/4 Or 1 1 9. 1 Or 25.4
Horizontal 1-1/4 Or Larger 31.8 Or Larger
Vertical 1-1/4 Or Larger 31.8 Or Larger

Table 12-3
Size Of Gas Piping
Maximum Delivery Capacity Of Cubic Feet Of Gas Per Hour Of Ips Pipe Carrying
Range Natural Gas Of 0.60 Specific Gravity Based On Pressure Drop Of 0.5 Inch
Water Column
Length in Feet
Pipe size
inches 10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125'
1/2 174 119 96 82 73 66 61 56 53 50 44
3/4 363 249 200 171 152 138 127 118 111 104 93
1 684 470 377 323 286 259 239 222 208 197 174
1-1/4 1404 965 775 663 588 532 490 456 428 404 358
1-112 2103 1445 1161 993 880 798 734 683 641 609 536
2 4050 2784 2235 1913 1696 1536 1413 1315 1234 1165 1033
2-1/2 6455 4437 3563 3049 2703 2449 2253 2096 1966 1857 1646
3 11,412 7843 6299 5391 4778 4329 3983 3705 3476 3284 2910
3-1/2 16,709 11,484 9222 7893 6995 6338 5831 5425 5090 4808 4261
4 23,277 15,998 12,847 10,995 9745 8830 8123 7557 7091 6698 5936

Feet>> 150 200 250 300 350 400 450 500 550 600
1/2 40 34 30 28 25 24 22 21 20 19
3/4 84 72 64 58 53 49 46 44 42 40
1 158 135 120 109 100 93 87 82 78 75
1-1/4 324 278 246 223 205 191 179 169 161 153
1-1/2 486 416 369 334 307 286 268 253 241 230
2 936 801 710 643 592 551 517 488 463 442
2-1/2 1492 1277 1131 1025 943 877 823 778 739 705
3 2637 2257 2000 1812 1667 1551 1455 1375 1306 1246
3-1/2 3861 3304 2929 2654 2441 2271 2131 2013 1912 1824
4 5378 4603 4080 3697 3401 3164 2968 2804 2663 2541

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