The following amendments to the Uniform Plumbing Code are hereby made and incorporated into such Plumbing Code as filed.
(A) Cost of permit. Cost of Permit (Section 20.7) regarding permit fees may be revised from time to time by resolution of Board of Supervisors. Said fee shall be published in accordance with SDCL § 7-25A-36. A copy of said fee schedule shall be kept on file with the District Manager at the office of the district.
(B) Board of Appeals (formerly Section 20.14, Uniform Plumbing Code). In order to hear and decide appeals of orders, decisions and determinations made by the administrative authority relative to the application and interpretation of this Code, there shall be and is hereby created a Board of Appeals consisting of those persons who are members of Board of Supervisors. The administrative authority shall be an ex-officio member of and shall act as Secretary to said Board but shall have no vote upon any matter before the Board. The Board of Appeals shall have authority to retain and rely on consultants having experience in training upon the matters in question. The Board shall adopt rules and procedures for conducting its business and shall render all decisions and findings in writing to the applicant with a duplicate copy to the administrative authority.
(C) Use of Copper Tubing (Section 203d Uniform Plumbing Code, modified).
(a) Copper tube for water piping shall have a weight of not less than that of copper tube Type K for water piping underground and under a building and Type M for above ground in a building.
(D) Drainage of fixtures located below the next upstream manhole or below the main sewer level (Section 409(a) Uniform Plumbing Code, modified).
(a) All drainage pipe serving fixtures shall be protected from backflow of sewage by installing an approved type backwater valve and each such backwater valve shall be installed only in that branch or section of the drainage system which receives the discharge from fixtures located below the elevation of the curb or property line.
(E) Table 4-3 of the Uniform Plumbing Code, modified. The minimum building sewer and building drain shall be four inches in diameter.
(F) Water pressure, pressure regulators and pressure relief valves (Section 1007 Uniform Plumbing Code, modified).
(b) Excessive water pressure. Where local water pressure is in excess of 100 pounds per square inch, an approved type pressure regulator preceded by an adequate strainer shall be installed and the pressure reduced to 100 pounds per square inch or less. For potable water services up to an including one and one-half regulators, provision shall be made to prevent pressure on the building side of the regulator from exceeding main supply pressure. Approved regulators with integral bypasses are acceptable. Each such regulator and strainer shall be accessibly located and shall have the strainer readily accessible for cleaning without removing the regulator or strainer body or disconnecting the supply piping. All pipe size determinations shall be based on 80% of the reduced pressure.
(G) Water heater permits. Water Heater Permits, Section 1303 of the Uniform Plumbing Code pertaining to permits for work done on water heaters shall be omitted.
(H) Material requirements.
(1) Pipe shall be manufactured from virgin materials qualified by the National Sanitation Foundation (NSF) testing laboratory or other similar accredited testing agencies as meeting the requirements of NSF Standard No. 14, relating to thermo-plastic materials, pipes, fittings, valves, traps and joining materials. All pipe shall be manufactured from the base material Polyethylene (PF) 3406 or Polyvinyl Chloride (PVC) Schedule 80 pipe and fittings.
(2) For any particular kind and size of pipe, the pressure rating for water at 73ºF shall not be less than 160 psi. Polyethylene 2306 one-inch minimum tube size 160 psi working pressure or more. Polybutylene ASTIM D2666 one-inch minimum tube size 160 psi or more working pressure. For installation of two and one-half inch and larger, P.V.C. Schedule 40 or 80 is to be bell type joint with slip joint gasket having a rated working pressure of 220 pound psi or more at 73ºF. P.V.C. smaller than two and one-half inch and solvent weld joints not approved below ground.
(I) Joints and connections.
(1) All PE connections shall be made with mechanical compression fittings equipped with elastomeric gaskets to provide the pressure seal and with suitable insert for internal support. Heat fusion, flared and insert clamp joints will not be acceptable. Curb stops shall be low turning torque type, full open valves as approved by the Utilities Department.
(2) All PVC fittings and connections shall comply with IAPMO standards.
(J) Installation requirements.
(1) Pipe and fittings shall be positioned so that identifying markings are readily visible for inspection.
(2) Pipe shall not be installed in any chase or tunnel that is heated, contains hot water, hot air or steam piping.
(3) Sleeves, two pipe diameters larger in size, shall be installed to protect the piping when passing through or under a foundation, wall, footing or a floor. The space between the pipe and sleeve shall be filled with approved sealants as recommended by the pipe manufacturer to assure their compatibility with the plastic pipe.
(4) The pipe shall be buried a minimum of five and one-half feet below the ground line at all points.
(K) Installation. Installations shall be made in accordance with the following specific requirements; and to the extent applicable, in accordance with the recommendations included in the appendixes of ASTM D2661 and D2665.
(1) A minimum of one-eighth inch clearance shall be provided when a pipe passes through a wall or floor. Where required to be sealed by other codes and ordinances, the material used shall conform with the recommendations or the pipe manufacturer to assume their compatibility with the plastic pipe.
(2) When buried, sewer pipe shall be a minimum of four feet below the outside ground line at all points.
(3) Piping shall be separated from any portion of a private water system by a horizontal distance of at least ten feet or greater as may be specified by the Plumbing Inspector.
(L) Chapter 12 of the Uniform Plumbing Code. Chapter 12 of the Uniform Plumbing Code is deleted and Sections (1) through (17), inclusive, are enacted in lieu thereof.)
(1) Fuel gas piping. Sections (1) through (17), inclusive, shall govern the installation of all fuel gas piping in or in connection with any building or structure or within the property lines of any premises.
(2) Definitions. For the purpose of this Code, certain terms, phrases, words and their derivatives shall be interpreted as set forth in this section; provided, however, that whenever the words “gas meters” appear, they shall be construed to also mean valves and those devices required for the regulation of pressure and the measurement of natural gas being dispensed for any building, structure or premises.
Whenever the words “P.P.G. Facilities” appear, they shall be construed to mean tanks, containers, container valves, regulating equipment, meters and/or appurtenances for the storage and supply of liquefied petroleum gas for any building, structure or premises.
(a) “Appliance fuel connector” means an assembly of listed semi rigid or flexible tubing and fittings to carry fuel between a fuel piping outlet and a fuel burning appliance.
(b) “Approved,” as to materials, workmanship and types of construction, means approval by the administrative authority as the result of investigation, inspection or test conducted by them or by reason of accepted principles or tests by other recognized testing agency or authority.
(c) “Fuel gas” means natural, manufactured, liquefied petroleum or a mixture of these.
(d) “Gas piping” means any installation of pipe, valves or fittings that is used to convey fuel gas, installed on any premises or in any building, but shall not include:
(1) Any portion of the service piping; or
(2) Any approved piping connection six feet or less in length between an existing gas outlet and a gas appliance in the same room with the outlet.
(e) “Gas piping system” means any arrangement of gas piping supplied by one meter and each arrangement of gas piping serving a building, structure or premises, whether individually metered or not.
(f) “Gas utility” means the duly enfranchised public utility supplying the gas from its street mains.
(g) “Service piping” means the piping and equipment between the street gas main and the gas piping system inlet, which is installed by and is under the control and maintenance of the serving gas supplier.
(3) Permit.
(a) It is unlawful for any person to install or alter or cause to be installed or altered any gas piping without first obtaining a permit from the administrative authority except as exempted by the Uniform Plumbing Code or by district ordinance; provided, however, no permit shall be required for a public utility to disconnect defective gas piping or equipment when authorized by Section (8) below.
(b) Permits for gas piping shall show the total number of gas outlets to be provided for on each system and such other information as may be required by the administrative authority.
(c) Fees shall be set by resolution of the District Board of Supervisors.
(4) Plans required. The administrative authority may require the submission of plans, specifications, drawings and such other information as he or she may deem necessary prior to the commencement of, and at any time during the progress of, any work regulated by this chapter.
(5) Workmanship. No gas piping shall be strained or bent and no appliance shall be supported by or develop any strain or stress on its supply piping. Gas piping supplying appliances designed to be supported by the piping may be used to support such appliances when first approved by the administrative authority.
(6) Inspections.
(a) Upon completion of the installation, alteration or repair of any gas piping for which a permit is required, and prior to the use thereof, the contractor shall, before calling administrative authority for an inspection, test the system in such a manner as to satisfy himself or herself the system is free from leaks. One of the following requirements must be met before the gas line is approved for service:
(1) The installing contractor furnish the inspection services division with his or her written statement (on a form provided by the administrative authority) that the said contractor has tested the gas line in accordance with the testing procedures provided in this section and found that no leaks exist; or
(2) The inspector witnesses an air test of the system and finds that no leaks exist.
(b) The testing procedures shall include an air pressure test, at which time the gas piping shall stand a pressure of not less than ten pounds per square inch (68.9 kPa) gauge pressure, or at the discretion of the administrative authority, the piping and valves may be tested at a pressure of at least six inches (152.4 mm) of mercury, measured with a manometer or slope gauge. Test pressures shall be held for length of time satisfactory to the administrative authority, but in no case for less than 15 minutes, with no perceptible drop in pressure. For welded piping, and for piping carrying gas at pressures in excess of 14 inches (0.4 m) water column pressure, the test pressure shall not be less than 60 pounds per square inch (413.4 kPa) and shall be continued for a length of time satisfactory to the administrative authority, but in no case for less than 30 minutes. These tests shall be made using air pressure only. All necessary apparatus for conducting tests shall be furnished by the permit holder. A soap test for low pressure piping will be acceptable.
(c) All excavations required for the installation of underground piping, except that portion owned and operated by the gas utility company, shall be kept open until such time as the pipe has been inspected and approved. Any such piping covered or concealed before such approval shall be exposed for inspection at the direction of the administrative authority.
(d) If, upon final piping inspection, the installation is found to comply with the provisions of this Code, a certificate of inspection may be issued by the administrative authority in such form as the administrative authority shall determine. A copy of such certificate shall be issued to the gas utility company providing service to the premises. It is unlawful for any person to turn on, or cause to be turned on, any fuel gas or any gas meter or meters, until such certificate of final inspection, as provided in this section, have been issued.
(e) The failure of any person required by this Code to obtain a permit shall absolve the administrative authority from any duty, obligation or responsibility to inspect the installation, alteration or repair of any gas piping.
(7) Authority to render gas service. It is unlawful for any person, firm or corporation, excepting an authorized agent or employee of a person, firm or corporation engaged in the business of furnishing or supplying gas and whose service pipes supply or connect with the particular premises, to turn on or reconnect gas service in or on any premises where and when gas service is at the time not being rendered.
(8) Authority to disconnect.
(a) The administrative authority or the gas utility is authorized to disconnect any gas piping or appliance or both which is found not to conform to the requirements of this Code or which may be found defective and in such condition as to endanger life or property.
(b) Where such disconnection has been made, a notice shall be attached to such gas piping or appliance or both, which shall state the same has been disconnected together with the reasons therefor.
(c) Such attached notice shall not be removed or shall either gas piping or appliances be reconnected until authorized by the administrative authority or gas utility to do so.
(d) It is unlawful to remove or disconnect any gas piping or gas appliance without capping or plugging with a screw joint fitting the outlet from which the pipe or appliance was removed. All outlets to which gas appliances are not connected shall be left capped gas tight on any piping system which has been installed, altered or repaired.
(9) Gas meter locations.
(a) All meters shall be installed out of doors at a point agreeable to the property owner or the building contractor and the gas utility company. Where it is not possible to meet the outdoor requirements, the owner or contractor shall contact the gas utility for their approval on an alternate location.
(b) In a building using both gas and electrical service, the meters associated with these services will be grouped to facilitate testing and reading. The location is to be agreeable to the property owner or building contractor and the utility company.
(c) Meters will not be located in an inaccessible area or those subject to damage.
(d) One metering installation will be allowed for each building using gas. More than one meter per building will be allowed only when there is more than one customer or more than one class of service.
(e) The utility company will make the connection to the customer’s piping, when already installed, to a readily accessible point located within two feet of the company’s previously agreed upon point for delivery. The customer will make the connection to the utility’s piping when the metering installation has been installed to the previously agreed upon point of delivery.
(10) Material for gas piping.
(a) Gas piping shall be so constructed and installed as to be durable, substantial and gas tight. All steel pipe concealed and over two inches, and all pipe, regardless of size, carrying one psi or more shall have welded joints and fittings between the customer’s connection at the meter installation and the appliance shut off valve.
(b) All pipe and fittings 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. Cast iron pipe or fittings and galvanized pipe or fittings, street ells, street tees and bushings shall not be used.
(c) Not less than standard weight wrought iron or steel pipe shall be used when threaded and it shall comply with the “American Standard for Pipe Threads,” ASA B36.10 (latest issue).
(d) Pipe and fitting thread shall comply with the “American Standard for Pipe Threads,” ASA B2.1 (latest issue).
(e) Shut off valves shall be of the iron body, plug type, or brass A.G.A. approved. Shut off valves shall comply with the American Standard requirements for “Manually Operated Gas Valves” Z21.15 (latest issue).
(f) Pipe joints may be screwed flanged, welded or compression type.
(g) Single wall, stainless steel flexible connectors and AGA listed double wall, brass flexible connectors are acceptable. (See Section (12) below)
(h) Plastic pipe or tubing of the following types is approved for outdoor underground fuel lines and is limited to sixty psi maximum pressure.
(i) Thermoplastic.
(A) PVC Type 1, Grades 1 and 2 (PVC 1120 and PVC 1220), manufactured as per ASTIM D-2513.
(B) Polyethylene Type III, Grade 3 (PE 3306), manufactured as per ASTIM D-2513.
(j) Thermosetting.
(A) Polyethylene Type III, Grade 3 (PE 3306) manufactured as per ASTIM D- 2517 and Type II, Grade 3 (PE 2306) Manufactured as per ASTIM D-1248.
(11) Installation of gas piping.
(a) Service piping shall be installed only by a plumbing, dusted air heating/cooling, or hydronic heating/cool contractor. Service piping to the customer shall be routed so as to be accessible for future maintenance. Its location shall be agreed upon with the property owner or the building contractor.
(b) Black wrought iron or steel.
(1) The building structure shall not be weakened by installation of the piping.
(2) Underground gas piping, when installed below grade through the outer foundation or basement wall of a building, shall be encased in a sleeve or otherwise protected against corrosion. The piping or sleeve shall be sealed at the foundation or basement wall to prevent entry of gas or water.
(3) When the installation of gas piping underground beneath buildings is unavoidable, the piping shall be encased in a conduit. The conduit shall extend into a normally usable and accessible portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent possible entrance of any gas leakage. The conduit shall extend at least four inches outside the building, be vented above grade to the outside, and be installed in a way as to prevent the entrance of water.
(4) Ferrous gas piping installed underground in exterior locations shall be welded and protected from corrosion by approved coatings or wrapping materials and all such horizontal piping shall have at least 12 inches of earth cover or other equivalent protection. Risers shall be wrapped to a point at least six inches above grade. It shall be insulated away from all other piping and shall be cathodically protected.
(5) All gas pipe protective coatings shall be approved types, machine applied and conform to recognized standards. Field wrapping shall provide equivalent protection and is restricted to those short sections and fittings necessarily stripped for welding.
(6) Pipe shall not be run in inaccessible or concealed space in buildings where its condition cannot be inspected and where undetected leakage might cause dangerous accumulations of gas. Where such conditions cannot be met, welded steel pipe shall be used.
(A) Residences where the finishing includes the concealment of gas piping shall meet the following requirements:
(i) Unions, tube fittings, running threads, right and left couplings, bushings and swing joints made by combinations of fittings shall not be used.
(ii) If a covering is installed that will conceal existing gas piping, it shall be of a removable type.
(iii) If (i) and (ii) cannot be met, concealed piping shall be welded.
(7) Pipe passing through foundation or masonry walls or otherwise exposed to moisture or corrosive conditions shall be protected from corrosion in a manner approved by the gas utility.
(8) Gas pipe in buildings shall be supported with pipe hooks, metal pipe straps, bands or hangers suitable for the size of pipe and of adequate strength and quality and located at proper intervals so that the piping cannot be moved accidentally from the installed position. Gas piping shall not be supported by other piping.
(9) Pipe joint compounds approved for use with natural and liquefied petroleum gases shall be used sparingly and applied to male threads only.
(c) Plastic pipe.
(1) Each buried pipe must have a minimum of 12 inches cover. Consideration should be given to protecting the piping from physical damage when it passes through flower beds, shrub beds and other such cultivated areas.
(2) Plastic pipe cannot terminate above ground where it can be exposed to sunlight or physical damage unless protected with a shield and connector approved by the gas supplier.
(d) Acceptable piping methods.
(1) All gas piping is to be black steel pipe.
(2) An accessible shut off valve shall be installed in the fuel supplying piping outside of each appliance and ahead of the union connection thereto, and in addition to any valve on the appliance. Shut off valves shall be within three feet of the appliance. Shut off valves may be accessibly 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.
(12) Appliance connectors.
(a) 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 (10)(g).
EXCEPTION:
A gas appliance may be connected with an approved double wall A.G.A. or single wall stainless steel listed metal appliance connector under the following conditions:
(1) All readily movable gas appliances shall be connected with approved, listed flexible type connectors that are in the same room as the appliance;
(2) Listed metal appliance connectors shall have an overall length of not to exceed three feet except a range connector, which may not exceed six feet;
(3) No part of such connector shall be concealed within or extended through any wall, floor or partition;
(4) 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;
(5) All connectors shall be of such size as to provide the total demand of the connected appliance;
(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 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 subject to excessive temperatures (above 125ºF), 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 15 feet in length, provided it connects outdoors to approved gas piping including an approved valve at the inlet of the hose connector; and
(8) Suspended unit heater may also be connected with an approved appliance connector.
(13) Liquefied 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:
(a) All liquefied petroleum gas facilities shall conform to 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;
(b) Where liquefied petroleum gas facilities serve more than one customer through separate piping systems, each system shall be identified in a manner satisfactory to the administrative authority and the gas supplier;
(c) All liquefied petroleum gas facilities shall be so placed as to be at all times readily accessible for inspection, reading, testing and shutting off the gas supply. All service piping and main supply shut off valves shall be outside of the building. All main supply valves shall be of approved type and readily accessible;
(d) 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 instructions;
(e) Liquefied 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;
(f) Liquefied petroleum gas piping shall not serve any gas water heater located in a pit where heavier than air gas might collect to form a flammable mixture;
(g) Pipe joint compounds used on thread connections shall be insoluble in liquefied petroleum gas;
(h) Every valve and appurtenance used on such piping shall be designed and approved for use with liquefied petroleum gas; and
(i) Discharge from relief valves shall be into the open air and shall be at least five feet away from any opening into a building.
(14) Leaks.
(a) Matches, candles and other open flames shall not be used to check for gas leakage. Checks for leaks shall be made with approved gas leak detectors or by brushing a soap and water solution or its equivalent on fittings and other suspected locations.
(b) 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.
(c) 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.
(15) Interconnections of gas piping systems.
(a) It is unlawful to connect any gas appliance in such a manner that such appliance may receive gas from more than one system of gas piping.
(b) When liquefied petroleum or other stand by gas is interconnected with the regular piping system, an approved three way two port valve or other adequate safeguard acceptable to administrative authority and the serving gas supplier shall be installed to prevent backflow into either piping system.
(c) 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 withstanding any pressures which may be imposed on it.
(d) 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 system of gas piping to another, where such systems are supplied with gas from separate meters, is prohibited, and any such valves or interconnection between separate systems of gas piping shall be removed upon order of this administrative authority.
(16) Required gas supply.
(a) The following regulations as set forth in this section and in Section (17), 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 0.65 supplied at six to eight inches water column pressure at the outlet of the meter.
(b) 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 outlet.
(c) Where the gas appliances to be installed have not been definitely specified, Table 12-1 below may be used as a reference to estimate requirements of typical appliances.
Table 12-1 Minimum Demand of Typical Gas Appliances in BTU Per Hour | |
To obtain the cubic feet per hour of gas required, divide the BTU input of appliances by 1,000. (The BTU heating value per cubic foot of gas). | |
Appliances | Demand in BTU |
Table 12-1 Minimum Demand of Typical Gas Appliances in BTU Per Hour | |
To obtain the cubic feet per hour of gas required, divide the BTU input of appliances by 1,000. (The BTU heating value per cubic foot of gas). | |
Appliances | Demand in BTU |
Barbecue (residential) | 50,000 |
Bunsen burner | 3,000 |
Domestic clothes dryer | 35,000 |
Domestic gas range | 65,000 |
Domestic recessed oven section | 25,000 |
Domestic recessed top burner section | 40,000 |
Fireplace log lighter (commercial) | 50,000 |
Fireplace log lighter (residential) | 25,000 |
Gas engines (per horsepower) | 10,000 |
Gas refrigerator | 3,000 |
Steam boilers (per horsepower) | 50,000 |
Storage water heater up to 30-gallon tank | 30,000 |
Storage water heater 40- to 50-gallon tank | 50,000 |
(d) The size of the supply piping outlet for any gas appliance shall be not less than one-half inch.
The minimum size of any piping outlet for a freestanding gas range or a mobile home shall be three- quarter inch.
(17) Required gas piping size.
(a) Where the maximum demand does not exceed 250 cubic feet per hour and the maximum length of piping between the meter and the most distant outlet is not over 250 feet, the size of each section and each outlet of any system of gas piping shall be determined by means of Table 12-2 below. Other systems within the range of Table 12-2 may be sized from that table or by means of the methods set forth in subsection (c) of this section.
(b) To determine the size of each section of pipe in any system within the range of Table 12-2, 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 12-2, 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 the vertical column just selected and the gas demand for that outlet. If the exact figure of demand is not shown, choose the next larger figure below in the column.
Table 12-2 Size of Gas Piping | |||||||
Maximum delivery capacity in cubic feet of gas per hour (CFH) of I.P.S. pipe carrying natural gas of 0.65 specific gravity based on pressure drop 0.5 for water column. | |||||||
Pipe Size (Inches) | Length in Feet | ||||||
10' | 20' | 30' | 40' | 50' | 60' | 70' | |
Table 12-2 Size of Gas Piping | |||||||
Maximum delivery capacity in cubic feet of gas per hour (CFH) of I.P.S. pipe carrying natural gas of 0.65 specific gravity based on pressure drop 0.5 for water column. | |||||||
Pipe Size (Inches) | Length in Feet | ||||||
10' | 20' | 30' | 40' | 50' | 60' | 70' | |
1/2 | 170 | 118 | 95 | 80 | 71 | 64 | 60 |
3/4 | 360 | 245 | 198 | 169 | 150 | 135 | 123 |
1 | 670 | 430 | 370 | 318 | 282 | 255 | 235 |
1-1/4 | 1,320 | 930 | 740 | 640 | 565 | 510 | 470 |
1-1/2 | 1,990 | 1,370 | 1,100 | 950 | 830 | 760 | 700 |
2 | 3,880 | 2,680 | 2,150 | 1,840 | 1,610 | 1,480 | 1,350 |
2-1/2 | 6,200 | 4,120 | 3,420 | 2,950 | 2,600 | 2,360 | 2,180 |
3 | 10,900 | 7,500 | 6,000 | 5,150 | 4,600 | 4,150 | 3,820 |
3-1/2 | 16,000 | 11,000 | 8,900 | 7,600 | 6,750 | 6,200 | 5,650 |
4 | 22,500 | 15,500 | 12,400 | 10,600 | 9,300 | 8,500 | 7,900 |
Pipe Size (Inches) | Length in Feet | ||||||
80' | 90' | 100' | 125' | 150' | 200' | 250' | |
1/2 | 55 | 52 | 49 | 44 | 40 | 34 | 30 |
3/4 | 115 | 108 | 102 | 92 | 83 | 71 | 63 |
1 | 220 | 205 | 192 | 172 | 158 | 132 | 118 |
1-1/4 | 440 | 410 | 390 | 345 | 315 | 270 | 238 |
1-1/2 | 650 | 610 | 570 | 510 | 460 | 400 | 350 |
2 | 1,250 | 1,180 | 1,100 | 1,000 | 910 | 780 | 690 |
2-1/2 | 2,000 | 1,900 | 1,800 | 1,600 | 1,450 | 1,230 | 1,100 |
3 | 3,550 | 3,300 | 3,120 | 2,810 | 2,550 | 2,180 | 1,193 |
3-1/2 | 5,250 | 4,950 | 4,650 | 4,150 | 3,800 | 3,200 | 2,860 |
4 | 7,300 | 6,800 | 6,400 | 5,700 | 5,200 | 4,400 | 3,950 |
Pipe Size (Inches) | Length in Feet | ||||||
300' | 350' | 400' | 450' | 500' | 550' | 600' | |
1/2 | 27 | 25 | 23 | 22 | 21 | 20 | 19 |
3/4 | 57 | 52 | 48 | 45 | 43 | 41 | 39 |
1 | 108 | 100 | 92 | 86 | 81 | 77 | 74 |
1-1/4 | 215 | 200 | 185 | 172 | 162 | 155 | 150 |
1-1/2 | 320 | 295 | 275 | 255 | 240 | 230 | 220 |
2 | 625 | 570 | 535 | 500 | 470 | 450 | 430 |
2-1/2 | 1,000 | 920 | 850 | 800 | 760 | 720 | 690 |
3 | 1,750 | 1,600 | 1,500 | 1,400 | 1,320 | 1,250 | 1,200 |
3-1/2 | 2,600 | 2,400 | 2,200 | 2,100 | 2,000 | 1,900 | 1,800 |
4 | 3,600 | 3,250 | 3,050 | 2,850 | 2,700 | 2,570 | 2,450 |
(4) Opposite this demand figure, in the first column at the left in Table 12-2, will be found the correct size of the pipe.
(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 removed outlet in that branch and follow the procedures of Steps (2), (3), (4) and (5) above. NOTE: Size branch piping in the order of their distance from the meter location beginning with the most distant outlet not previously sized.
(c) For conditions other than those covered by subsection (a) of this section, 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 not time exceed five-tenths inches water column pressure.
(d) Where the gas pressure may be higher than 14 inches or lower than six 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 and the serving gas supplier supplying the gas.
(Prior Code, § 3-122) (Ord. 91-6, passed 9-19-1991; Ord. 94-1, passed 4-11-1994)