Good Practices for Gas Piping & Appliance Installations

136 Pages·2012·0.58 MB·English

Questar Gas Company
Good Practices for
Gas Piping
and
Appliance Installations
GREEN STICKER
The proper installation and adjustments of a natural gas appliance
is the responsibility of the installer. This book contains tables listing
the Btu content (heat value) and specific gravity of gas, deration
factors and altitudes throughout Questar’s service area. When
natural gas space heaters (furnaces, boilers, etc.) and water heating
equipment installations have been completed and properly adjusted
for the heat value of the gas and derated for altitude according to
the manufacturer’s installation instructions, the installer shall fill
out and post a “GREEN STICKER” on the appliance where it will
be visible by the customer. The green sticker is an identifier which
will let the customer or a repairman know that the appliance has
been properly adjusted.
Effective July 1, 2002, any contractor installing or servicing natural
gas appliances in Utah must have a Natural Gas Technician
Certification identification with them on the job site. Currently, the
certification is not required by Journeyman Plumbers. For further
information, contact Rocky Mountain Gas Association.
59060 04/10/12
SECTION I
(PREFACE)
GENERAL
The information contained in this booklet consists of guidance for
plumbing and heating contractors engaged in the installation of
gas-fired equipment in the area served by Questar Gas Company
(the Gas Company).
Information contained herein has been extracted from local codes
adopted and incorporated by local authorities into heating or
plumbing ordinances or codes and hence mandatory; however, this
booklet does not attempt to set forth all requirements of any such
ordinances or codes. Questar Gas Company recommends all
plumbing and heating contractors become thoroughly familiar with
the requirements of the applicable ordinances or codes, contained
in the International Fuel Gas Code, International Residential Code,
International Mechanical Code, International Plumbing Code,
National Electrical Code, American Gas Association standards,
National Board of Fire Underwriters, as well as with the
information contained herein so gas installations made by them
will measure up to the proper standards of quality and
workmanship.
QUESTAR GAS COMPANY 1-800-323-5517
Gas line breaks, leaks, odor or pressure problems ONLY
please call 1-800-541-2824
Additions and/or changes made to the Good Practice Book are
indicated by a line in the right margin.
4/10/12
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CONTENTS
SECTION I - GENERAL
Paragraph Page No.
1. General Statement..............................................................7
2. Problems Not Covered by This Information...................... 7
GENERAL SAFETY PRECAUTIONS........................................ 8
SECTION II - DEFINITIONS..................................................... 9
SECTION III - GAS PIPING INSTALLATION
Paragraph Page No.
1. Meter Location .................................................................26
2. Meter/Riser Protection......................................................26
3. Service Connections.........................................................27
4. Piping Plan........................................................................29
5. Gas Piping Material...........................................................29
6. Plastic Piping Material......................................................29
7. Corrugated Stainless Steel Tubing (CSST).......................30
8. Workmanship and Defects................................................30
9. LP Gas...............................................................................31
10. Installation of Gas Piping..................................................31
11. Concealed Piping and Fittings..........................................33
12. Shut-off Valves.................................................................33
13. Pressure Testing...............................................................34
14. Meter Spot Test................................................................35
15. Appliance Connectors......................................................36
16. Required Gas Supply........................................................37
17. Required Gas Piping Size..................................................38
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SECTION IV - APPLIANCE INSTALLATION
Paragraph Page No.
1. Accessibility and Clearances............................................46
2. Special Conditions Created by Mechanical
Exhausting or Fireplaces .............................................47
3. Installation in Garages......................................................47
4. Hazardous and Prohibited Locations................................48
5. Warm-Air Furnace ............................................................49
6. Vented Wall Furnaces.......................................................49
7. Floor Furnaces..................................................................49
8. Suspended Unit Heaters...................................................49
9. Residential Boilers............................................................50
10. Log Lighters .....................................................................50
11. Unvented Room Heaters...................................................50
12. Gas Logs (Decorative Appliances)...................................51
13. Water Heaters...................................................................51
14. Gas Ranges.......................................................................52
15. Clothes Dryer....................................................................52
16. Commercial Clothes Dryer ................................................53
SECTION V - COMBUSTION AND VENTILATION AIR
Paragraph Page No.
1. Air for Combustion and Ventilation..................................54
2. Combustion Air Ducts......................................................54
3. Louvers and Grilles...........................................................56
4. Adequate Volume..............................................................57
5. Appliances Located in Unconfined Spaces......................58
6. Appliances Located in Confined Spaces..........................58
7. Outside Air........................................................................59
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SECTION VI - VENTING
Paragraph Page No.
1. Responsibility...................................................................65
2. Appliances Required to be Vented...................................65
3. Draft Hoods......................................................................65
4. Vent and Vent Connector Materials..................................65
5. Vent and Vent Connector Clearances................................66
6. Vent Connectors...............................................................66
7. Vent Dampers....................................................................67
8. Sizing Vents/Connectors...................................................68
9. Category I Venting............................................................71
10. Category II, III, and IV Venting.........................................71
11. Gas Vent Termination........................................................72
12. Mechanical Draft Termination ..........................................73
13. Direct Vent Termination ....................................................73
14. Masonry Chimneys ..........................................................74
15. Prohibited Locations.........................................................75
SECTION VII - CONTROLS AND REGULATORS
Paragraph Page No.
1. Automatic Valves..............................................................80
2. Gas Pressure Regulators...................................................80
3. MP Regulators..................................................................81
4. Venting of MP Regulators ................................................81
5. Venting for Diaphragm Type Valves .................................82
6. Atmospheric Vents and Gas Vent Bleed or
Relief Lines for Boilers (over 400,000 Btu)
ANSI CSD-1......................................................................82
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SECTION VIII - PROCEDURES TO BE FOLLOWED TO
PLACE AN APPLIANCE IN OPERATION
Paragraph Page No.
1. Procedure..........................................................................84
2. Burners to be Adjusted.....................................................84
3. Appliance Rating..............................................................84
4. Clocking Burner Input ......................................................85
5. Adjusting Burner Input ....................................................91
6. Primary Air Adjustment.....................................................91
7. Automatic Pilots...............................................................91
8. Protective Devices............................................................91
9. Checking the Draft............................................................91
10. Instructions to the Customer............................................91
11. Operation/Installation Instructions ..................................91
SECTION IX - MANUFACTURED HOME (MOBILE HOME),
MODULAR HOME, AND PARK TRAILER
Paragraph Page No.
1. Manufactured Home.......................................................110
2. Modular Homes..............................................................110
3. Recreation Vehicle ......................................................... 112
4. Gas Piping...................................................................... 112
5. Venting............................................................................115
6. Appliance Installation ....................................................115
7. Conversion of Appliances Located in
Mobile Homes ................................................................116
Formulas to know...................................................................117
INDEX.............................................................................119-127
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TABLES AND FIGURES
Table Page No.
I Commercial Meter Spread...............................................28
II Piping Support................................................................32
III Meter Dial Test Times ....................................................35
IV Maximum Capacity of Pipe in CFH (4 oz.).......................41
V Maximum Capacity of Pipe in CFH (2 lb.) .......................42
VI Corregated Stainless Steel Tubing (CSST).....................43
VII Duct Sizes Round...........................................................61
VIII Vent Sizes .......................................................................70
IX Vent Termination.............................................................73
Vent Tables.....................................................................76
X Standard Deration Factors.........................................87-90
XI Pressure Factor Multiplier..............................................93
XII Conversion of Inches of Water Column to
Ounces of Gas Pressure .................................................94
XIII Clocking Meter - Gas Input to Appliance in
Cubic Feet Per Hour (4 ounce)...................................95-97
XIV Clocking Meter - Gas Input to Appliance in
Cubic Feet Per Hour (2 pound)................................99-100
XV Orifice Capacities...................................................101-109
Figure Page No.
1. Meter Set...................................................................................27
2. Multiple Meter Set....................................................................28
3. CSST Bonding...........................................................................37
4. Sizing a House Piping System...................................................39
5. Volume of Space.........................................................................57
6. Air Supply from Inside Building...............................................59
7. Air Supply from Crawl Space...................................................61
8. Air Supply from Attic...............................................................62
9. Air Supply - One Opening........................................................63
10. Air Supply Horizontally...........................................................64
11. Vent Terminations......................................................................74
12. Automatic Valve.......................................................................80
13. Combination LP-Gas and Natural Gas System....................... 111
14. LP-Gas System........................................................................111
15. Manufactured Homes.............................................................. 104
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GENERAL STATEMENT
1. Questar Gas Company is not responsible for the safe or proper
installation of gas piping, equipment or appliances beyond its
meter and does not, by the publication and distribution of this
booklet, assume any such responsibility. However, if Questar
Gas Company finds a gas-burning installation or appliance
beyond its meter which it considers to be unsafe, it is authorized
to refuse gas supply or gas service to such installation or
appliance until the defect or condition which renders it unsafe
is corrected.
All persons who are not authorized by Questar Gas Company
are prohibited from connecting or disconnecting Questar Gas
Company’s meters or service pipes or in any way altering or
interfering with Questar Gas Company’s meters or service pipes.
Upon receipt of notice Questar Gas Company will promptly
attend to any work required in connection with its meters or
service pipes. For connections requiring removal of the gas
meter, contact Questar Gas Company for removal of the meter.
PROBLEMS NOT COVERED
BY THIS INFORMATION
2. Architects, contractors, engineers, plumbers, heating contractors
and fitters are invited to consult with Questar Gas Company on
piping or appliance problems and industrial applications not
covered by this information.
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