Section 15416 gas piping system part 1 general 01 description of work

Download 145.89 Kb.
Size145.89 Kb.
  1   2

11/30/15 DESIGN NO. _____


A. Extent of gas piping system work is indicated on Drawings and by the requirements of this Section.
A. Product Data:
1. Manufacturer’s product data
2. Installation Instructions
3. Capacities
4. Gas booster manufacturer’s design data sheet
B. Submit Shop Drawings indicating all operating pressures and catalog cuts for the following:
1. Gas piping materials
2. Gas piping layout including service, meter and distribution piping, with gas booster, if applicable.
3. Gas Safety Shut-Off Valves
4. Master Gas Control Valves
5. Gas Lubricated Plug Valves and Gas Cocks
6. Gas Pressure Booster System Including:
a. Gas booster pump

b. Gas pressure switch

c. Lubricated plug valves

d. Check valves

e. Flexible pipe coupling

f. Pressure gauges

g. Heat exchanger

h. Control system - panel and wiring diagram.

i. Pressure and gas flow compensation module

  1. Strainers

  1. Pipe joint sealing materials

  1. Flanges and Gaskets

  1. Pulsating Gas Meter

  1. Relay & Control Panel

12. Gas Pressure Regulators

C. Wiring Diagrams
D. Certifications
1. Submit copies of Certified Welder Qualifications. Submittal shall be made no less than seven (7) working days prior to commencement of work.
2. Certificate of satisfactory installation from the manufacturer of gas boosting system.
E. Submit a detailed schedule for the installation of gas piping and the welding thereof.
F. Warranty:
1. Gas Booster Pump

G. “New Steel Gas Pipe Corrosion Record” affidavit issued by Con Edison to document acceptance of the installed cathodic protection system.
A. Comply with the rules and regulations of the Gas Utility Company, New York City Building Department (DOB) and with the latest regulations of the Administrative Code of the City of New York.
B. When welding is to be performed as part of the work covered in this specification, the Contractor, before assigning any welder for this work, shall provide the Authority with the names of welders to be employed for this work. Welders installing gas piping at any pressure shall be qualified for all pipe sizes, wall thicknesses, and all positions in accordance with ASME Section IX Boiler and Pressure Vessel Code and be re-qualified on an annual basis and when requested by the commissioner.
1. The qualification testing shall be performed by an agency listed with the Department of Buildings, and the inspector witnessing the test shall be an authorized AWS Certified Welding Inspector. Radiographic test specimens shall be evaluated by a radiographic inspector having a minimum radiography qualification of Level II in accordance with the American Society of Non-Destructive Testing (ASNT) Recommended Practice Document No. SNT-TC-IA, Supplement A.
2. Copies of the certified welder qualification reports shall be maintained by the approved agency and the licensed plumber employing the welder(s) for at least six (6) years and shall be made available to the DOB upon request.
3. The licensed master plumber employing the welder(s) shall a submit a statement to the DOB including who welded the gas piping along with a copy(s) of the certified welder qualification report(s)witnessed by a representative of the licensed master plumber, at the time of the first roughing inspection.
4. The licensed master plumber employing the welder(s) shall assign to each welder an identification symbol or number to identify the welds performed by that particular welder. The welder shall identify all welds with his or her symbol or number. The licensed master plumber shall maintain records identifying the weld(s) made by each welder for at least six (6) years and shall make such records available to the DOB upon request.

  1. Upon completion of Gas Pressure Booster System installation and start-up, the booster manufacturer shall furnish a written certification to the Authority and the utility company that the Gas Booster System operates in accordance with the design standards.

  1. All welding of gas piping shall be in full compliance with ASME Section IX Boiler and Pressure Vessel Code. Whenever welding operations are performed, the services of a full time certified inspector or certified technician shall be retained by the SCA to ensure said compliance. Certified inspectors and certified technicians shall be qualified to perform visual inspections and shall have a minimum radiography qualification of Level II in accordance with the American Society of Non-Destructive Testing Recommended Practice Document No. SNT-TC-IA, Supplement A. The certified inspector or certified technician shall also be responsible for Controlled Inspection sign off upon completion of the work.

E. The Project Officer shall coordinate with FID to assure compliance during all phases of the work.

A. Provide manufacturers extended 5-year performance warranty against failure of the gas booster pump.
A. General
1. Gas Service & Gas Meter(s)
a. Gas service, meter(s) and meter piping systems, including pipe materials, shall be in accordance with the requirements as specified by the gas utility company providing the services, and in accordance with Appendix E of the 2014 NYC Fuel Gas Code.
b. Gas service piping run underground outside the building shall be mill wrapped in accordance with the Fuel Gas code and shall have cathodic protection in accordance with the serving utility company requirements for service piping.

1. Semi-rigid Stainless Steel Multi-Legs Hose Assembly. Refer to Article 2.14 – Flexible Gas Pipe Passing through Seismic Joint – for seismic resistance due to ground movement of gas service and gas distribution pipes.
2. Gas Distribution Piping
a. Gas distribution piping shall be in accordance with Chapter 4 – Gas Piping Installations of the 2014 NYC Fuel Gas Code
b. Gas distribution piping located on the roof or exposed to the elements shall receive one coat of rust inhibitor paint and one coat of yellow finish paint.

B. Piping

1. Gas piping shall be standard weight black steel pipe. Gas control, vent and relief piping shall also be standard weight, black steel pipe in accordance with Section FGC 403 of the 2014 NYC Fuel Gas Code. Steel pipe shall be seamless or welded made in accordance with the Current Edition of the ASTM A53 Specification.
2. In no case shall any gas pipe be less than 3/4". The sizes of pipe indicate nominal pipe size.
C. Gas Distribution Pipe Joints (Based on Gas Pressure in Serving Utility Piping Network)

1. Gas pressure in the utility’s street piping network is 1/2 psig (14” w.c.) or less (inclusive of system being provided with a gas booster pump):
a. 4”(inches) pipe dia. and smaller . Threaded or

b. Over 4” (inches) pipe dia. . . . . Welded

2. Gas pressure in the utility’s street piping network is greater than 1/2 psig but less that 15 psig (inclusive of the utility company providing a service regulator to reduce the incoming pressure to 1/2 psig):
a. Under 3” (inches) pipe dia. . . .Threaded or

b. 3”(inches) and larger pipe dia. . Welded

3. Piping over 15 psig
a. All piping . . . . . . . . . . . . Welded
D. Fittings
1. Fittings for screwed gas piping shall be 150 lb, class 150, black malleable iron fittings, conforming to ASTM A197, latest edition.
2. Compression type fittings and steel welding fittings shall be as specified and approved by the Gas Company.
3. Steel butt welding fittings shall conform to ANSI B16.9 requirements.
E. Flanges
1. All flanges shall be steel and compatible in type and pressure ratings with mating flange and shall comply with ANSI B16.5.
2. Flanges shall be welding neck or threaded end. Slip-on flanges are not permitted.
3. Where 150 pound steel flanges are bolted to Class 125 cast iron flanges, the raised face on the steel flange shall be removed.
F. Gaskets
1. Gaskets shall be compatible with the gas service on which they are used, without change to their chemical or physical properties.
2. Gasket shall be BLUE-GARD compressed asbestos free gaskets, style 3000 or GYLON gasketing style 3500, color: Fawn with Blue brand both as manufactured by Garlock Inc.
3. Gaskets of metal or metal-jackets, aluminum o-rings and spiral wound metal gaskets, or other materials, if approved by the Utility Company may be used.
4. Full face gaskets shall be used with all bronze and cast iron flanges.
G. Bolts and Nuts
Bolts and nuts shall be of best quality bolt steel with square head bolts and hexagon nuts with machine cut V threads.
H. Thread joint sealant materials
Thread sealant to be used on natural gas piping shall be RectorSeal Corp No. 5, Oatey Great Blue pipe joint compound Hercules Megaloc Multi-purpose thread sealant or approved equal. Thread sealant shall be a non-toxic, soft setting, slow drying sealant made from inert fillers. The joint sealant material may contain Teflon, if that substance is the approved type for natural gas application. Approved Teflon tapes may be used on natural gas lines. Non-approved Teflon tapes for use on piping for a natural gas system are prone to tearing when pipes are being assembled and tightened and bits of torn tape can migrate into the fluid system, clogging valves, screens, and filters.

I. Identification of Gas Pipe

Refer to Section 15431 for labeling of gas piping, which is required to be identified whether it will be enclosed or remain exposed as per Section FGC 401.5.

J. Paint
1. Paints and coatings used in the interior of building to mark piping for identification purposes shall be In compliance with Part 205, "Architectural Surface Coatings", Department of Environmental Conservation, State of New York, governing the emission of Volatile Organic Compounds and shall not:

  1. Exceed the VOC content limits established in the Green Seal Standard GS-11 Pints, First Edition, May 20, 1993.

  1. Exceed the VOC content limit of 250 g/L established in the Green Seal Standard GC-03, Anti-Corrosive Paints, Second Edition, January 7, 1997.

2. Primer Paint

a. Interior Application: Tnemec 115 Unibond DF or Benjamin Moore D.T.M. Acrylic Low Lustre WP25
b. Exterior Application: Tnemec 10 99 or Benjamin Moore D.T.M. Alkyd Low Lustre P23
3. Finish Paint
a. Interior Application: Acrylic Semi-gloss
b. Exterior Application: Aliphatic Urethane


A. Gas safety shut-off valves shall be FM & UL listed, electric motor operated, normally closed, manual reset type with standard handle. Valves shall be rising stem design with a straight through flow path with metal-to-metal seat and disc arrangement. The valve seat and rising stem shall be stainless steel and the disc ductile iron. Valve body shall be cast iron. Valves shall be provided with a NEMA 4 enclosure modified for Class 1, Division II hazardous locations, Solenoid voltage: 115VAC 60 Hz. Valves shall meet ANSI Class VI leakage standard and shall be provided with a visual indicator to note the position of the valve whether "OPEN" or "SHUT".
B. Gas safety shut-off valves 2" and smaller shall be threaded, 2½" and larger shall be flanged. Flanged valves shall be provided with companion flange set by valve manufacturer.
C. Gas safety shut-off valves shall be Maxon Corporation Series SMM12 for sizes 2" and smaller and Series CMM12 for valves 2½" and larger. All valves shall be provided with trim package 1-1.

D. A gas safety shut-off valve fitted in gas supply lines to water heaters and other gas-burning equipment shall be provided. Gas safety shut-off valve for equipment operating on natural gas shall be interlocked with a remote control switch/break glass switch that is intended to stop the flow of natural gas to these equipments. This contractor shall coordinate with the electrical contractor for the installation of the gas safety valve and interlocking same with the break glass switch.

A. Provide a sign made of two colors laminated engravers stock phenolic, 1/16" minimum thickness, machine engraved to expose inner core color (white). Signs to be provided with uniform margins and character size minimum 1/4" high.
B. Sign to read:


A. Master Gas Control Valve shall be a packless, explosion-proof solenoid operated valve. The valve shall have screwed aluminum or brass body and renewable composition discs for tight seating. Valve shall be of normally closed construction open when energized, equipped with explosion-proof solenoid approved by Underwriters for Class 1, Group D, hazardous locations. Valves shall be fully automatic (requiring no manual operation to reopen the valve after the valve has shutoff the gas supply). The solenoid valve shall be protected by a brass or bronze body strainer with stainless steel screen. For pipes up to and including 2" in size, strainer shall be Automatic Switch Co., Catalog No. 8600, or Muessco No. 351. For pipe 2½" and larger in size, strainer shall be Muessco No. 352. Valve shall be Automatic Switch Co. (ASCO) Bulletin No. 8215 with continuous duty class H insulation coil for low pressure of the size shown on plan.

B. Relay Panel: Relay controllers operating the solenoid to the master gas control valve shall be provided in a NEMA Type 1 enclosure, like the ASCO model# 108D90C for AC type panel or 108D10C for DC type panel. The relay shall open and de-energize the solenoid, but upon activation of the valve, the flow of gas shall not resume until an authorized person re-activates a key switch. Thus, the likelihood of an accidental gas leak may be avoided.

A. Master Gas control valve assembly shall be installed within a vented enclosure or vented cabinet. If enclosed in a vented cabinet, cabinet shall be sized in accordance with pipeline size and to allow for maintenance of the assembly. Cabinet shall be constructed of 16 gage steel box and 14 gage steel door. All trim shall be 3/4" arc-welded and ground smooth. Cabinet located in the Kitchen Area shall be fabricated of 18 gage type 304 stainless steel. Door shall be louvered vented type (top and bottom) with continuous piano hinge and key operated cylinder lock with dust shutter. Cabinet other than the one located in the Kitchen Area shall have prime baked coat of rust inhibitive electrostatic powder, baked, grey enamel, with finish to match room color. Cabinet shall be manufactured by Karp Associates Inc., Model #KRVB for recessed and Model #KSMB for surface mounted type or Acudor Products Inc., Model #ARVB for recessed and Model #ASVB for surface mounted type.
A. General

1. The contractor shall furnish a complete UL listed gas booster system which shall be capable of delivering a volume of natural gas while elevating gas pressure to a level required to adequately operate the gas fired boiler plant or roof-top units. The system shall contain all the required devices in order to provide a completely automatic operating system in full accordance with the requirements of the utility company and the building code.
2. The system shall include but not be limited to: appropriately sized gas booster pumps, check valves, gas pressure switches, heat exchanger, lubricated plug valves, flexible pipe couplings, gas pressure gauges, pressure and flow compensation module, control and indicating devices, and field support as specified hereafter.
3. The entire gas booster system shall be provided on a skid mounted unit. The supplier shall be responsible for all aspects of design, coordination and operation of all components of the system including integration with all gas-fired mechanical equipment.
B. Hermetically Sealed Centrifugal Gas Booster Pump
1. The gas booster system shall consist of duplex pumps for a building heated only by gas-fired rooftop units and simplex pump if boiler(s) running on dual fuels burner provides for the space heating. Each gas booster pump shall be UL listed and of the hermetically sealed type. The design of the booster shall enclose the direct-coupled motor and fan in an air tight steel housing without the requirement of external shaft seals. The fan shall be manufactured of spark resistant aluminum and shall be accessed through a fully gasket cover plate assembly.
Duplex gas booster pumps, if applicable, shall alternate and sequence based on length of time of operation, cycling, temperature of gas flowing through the system, and failure mode. Each pump shall be capable of supplying the required volume and inlet gas pressure for proper operation of all gas-fired mechanical equipment.
a. For ease of installation the booster design shall provide four (4) different mounting configurations which shall be determined and coordinated by the booster manufacturer during the time of system design. These configuration options shall position the booster outlet in such a way as to facilitate piping connections and eliminate excessive piping pressure loss.
b. The booster shall include a class 1, Group D, 3600 rpm explosion proof motor which shall be capable of operating on 208/230/460 volt, 3 phase power.
A factory mounted, UL listed junction box with sealing unilet shall be provided in order to make all necessary wiring connections.
The booster shall be equivalent to series HB as manufactured by Eclipse Combustion Co., Model GL-XXXX as manufactured by The Spencer Turbine Company or ENGB-XXX as manufactured by Etter Engineering.
C. Check Valves
Horizontally mounted F. M. approved disk type check valve shall be installed on the inlet to the gas booster.
Check valves shall be constructed of heavy duty cast iron with a removable top for ease of inspection and maintenance and shall have all 316 stainless steel trim with soft seats. Check valves shall be designed to withstand a back pressure differential of a minimum of 10 PSIG across the seat and shall be similar to Eclipse series 1000.
D. Recirculation Loop and Heat Exchanger
1. A cooling recirculation loop shall be provided which shall be used to provide adequate gas flow in order to cool the gas booster motor during low flow conditions.
As an integral part of the recirculation loop an air to air heat exchanger shall be installed in the loop piping. The heat exchanger shall be of the single pass modular type and shall be constructed of corrosion resistant aluminum.
2. The heat exchanger shall have a self-contained, temperature controlled fan and motor assembly which shall be controlled by the gas booster control system. The heat exchanger fan shall be operated when the temperature of the booster discharge is above setpoint.
Heat exchanger shall be similar to series 100 as manufactured by Eclipse Combustion.
In the discharge of the heat exchanger the contractor shall install an additional disk type check valve sized in accordance with gas booster manufacturer's recommendations. Check valve shall be similar in design to that previously specified.
E. Gas Booster Control System
1. A completely factory built gas booster control system shall provide safe, proper automatic operation of the gas booster pump.
The control system shall be obtained from one vendor who shall be responsible for all aspects of design, coordination and operation of all components of the entire gas booster system. The control system shall be a standard cataloged item which has been particularly designed for this application and shall have had field usage for at least three (3) years. Nonstandard controllers or controls not furnished by the booster vendor will not be acceptable.
Control system shall include as a minimum the following:

a. NEMA 7 wall mounted enclosure
b. Fusible disconnect switch with external handle
c. NEMA rated magnetic motor starter with overload protection for booster
d. Motor contactor for heat exchanger (when required)
e. Indicating lights for: Power on, Booster on, Low Gas Pressure and Heat exchanger on (when required).
f. Digital temperature controller with remote sensor for heat exchanger (when required).
g. Booster on/off switch
h. 4" alarm bell with silencing switch: to ring on low gas pressure
i. Low gas pressure switch
j. Engraved nameplates for all components
k. Numbered terminal strips for field connection
l. Electronic pressure and gas flow compensation module

m. Lon (or Ethernet) Communication module which shall provide integration of the controller into the BMS by the TCC. If required the vendor shall provide a gateway from the proprietary protocol to Lon, completely pre-configured for communication via Lon connection.
Booster control system shall be equivalent to series HBP.
2. Wired to the gas booster control system shall be a UL and FM listed low gas pressure switch which shall be set to open when inlet gas booster pressure falls to 3" WC.
When the switch opens it shall de-energize the booster motor control circuit disabling the booster. The switch shall also indicate a low gas pressure alarm on the front of the gas booster control panel.
The low gas pressure switch shall be explosion-proof, manual reset type and shall have an adjustment range of 1" to 30" WC. The switch shall be constructed in such a way as to allow for adjustment of the control setpoint without opening the explosion proof housing. Venting of the switch shall not be required.
The low gas pressure switch shall be similar to Eclipse model #AETECH 10036962
A pressure and gas flow compensation module shall provide for interlocking the gas booster pump(s) with all mechanical equipment needing gas pressure elevated above that which is guaranteed by the utility company. The pressure and gas flow control module shall include a factory-built pipe manifold with a manual by-pass that monitors the pressure and flow status in the gas discharge piping downstream of the booster pump. Valve and actuator component of the flow and pressure compensation module shall be made of aluminum and shall operate safely in temperature ranging from -5°F to 140°F. Valve shall maintain a constant, lockable, field adjustable and precisely regulated pressure and gas volume in the discharge piping at all times. Pressure and flow compensation module shall be similar to the PCFM series as manufactured by AETECH or an approved equal. Provide UL listing and CSA approval for the valve & actuator.
Based on demand from gas–fired equipment and pressure variations in the building system piping, the compensation module shall start and stop the gas booster. Provide a time delay or field adjustable setting to eliminate pump short cycling.
Cable connectors and other electrical components of the pressure and flow compensation module shall be rated for explosion-proof application.

The communication module shall provide the following information regarding the gas booster pump: System Status, Inlet Pressure, Outlet Pressure, Low Inlet Pressure Alarm, Low Discharge Pressure Alarm, Booster Pump Runtime Total, Heat Exchanger Runtime Total, Common Maintenance Alarm.
F. Coordination, Field Service and Quality Assurance
1. In order to provide a properly operating gas booster system the manufacturer shall review all aspects of the installation in advance of gas piping being installed, including gas piping layout shop drawings, boiler/ or roof top units gas train pressure requirements, and total load requirements for the proposed project. Upon verification of this information the manufacturer shall furnish a gas booster design data sheet to the Authority and the utility company outlining the parameters for system design including but not limited to:
a. No. of boilers/ or roof top units, total CFH minimum and maximum.
b. Gas booster inlet pressure
c. Gas pressure required at boiler/ roof top unit train inlet
d. Total equivalent length of gas piping including fittings
e. Discharge pipe diameter
f. Total discharge pipe pressure loss
g. Selected gas booster Model NO.
h. Booster flow capacity (CFH)
i. Booster discharge pressure (WC)
j. Total discharge pressure (WC)
k. Booster inlet pipe diameter
2. The booster manufacturer shall provide all required field service assistance for installation supervision and equipment start up.
Upon completion of system start up, the booster manufacturer shall furnish a written certification to the Authority and the utility company that the gas booster system operates in accordance with design standards.
3. After successful system start up, the gas booster manufacturer shall provide one (1) year field service for all system components. In addition, a five (5) year extended warranty agreement shall be made available from the booster manufacturer in order to provide reliable future service and operation of the booster system.
A. Lubricated plug valves for use on gas service and gas meter piping shall be as approved by the serving utility.
B. Lubricated plug valves for use on gas distribution piping; mains, branches and base of risers shall be cast iron body, rated for 200 pounds cold working pressure and shall be wrench operated, except valves 10" and larger which shall be worm gear operated.
C. Lubricated plug valves 2" and smaller shall be short pattern threaded; 2½" and larger shall be regular pattern flanged.
D. Lubricated plug valves shall be Nordstrom Valves Inc. Fig. 142 for sizes 2" and smaller, Fig. 115 for sizes 2½" through 4" inclusive, Fig. 165 for sizes 6" and 8", and Fig. 169 for sizes 10" and larger; or Walworth Fig. 1796 for sizes 2" and smaller, Fig. 1700F for sizes 2½" through 8", and Fig. 1707F for sizes 10" and larger.
A. Gas cocks shall be for use only as manual gas shut-off valves at each piece of gas burning equipment; shall be of the plug type, bronze construction with check, nut and washer bottom and tee handle.
B. Gas cocks shall be Fig. 10596 as manufactured by A. Y. Mc Donald Mfg. Co., or Series 52 as manufactured by Conbraco Industries Inc.
C. Gas cocks shall only be used on piping 1" and smaller.
A. Flexible range connectors shall be all metal flexible connectors suitable for the service required and listed for use with gas appliances by the American Gas Association (AGA). Connectors shall also be National Sanitation Foundation (NSF) design certified and have a City of New York Material Equipment Acceptance (MEA) approval.
B. Flexible connectors shall be of corrugated stainless steel, encased in stainless steel braid, covered with a thick super-flex PVC coating.
C. Flexible range connectors for food service equipment shall be heavy duty, listed and labeled as complying with ANSI Z21.69. Connectors for use with Commercial Grade Equipment shall be as manufactured by Dormon Mfg. Company and T&S Brass and Bronze Works, Inc. Safe-T-Link, HG-Series.
A. Provide a sign made of two colors laminated engravers stock phenolic, 1/16" minimum thickness, machine engraved to expose inner core color (white). Sign to be provided with uniform margins and character size 1”" high.
B. Sign to read:
A. Secure from the utility company gas meter and other ancillaries such as gas regulator that may be necessary for the complete installation of the gas system.

For projects involving LonWorks network, the contractor shall request pulsating type gas meter, capable of transmitting signal outputs to the energy management system (part of the BMS) that is provided by the Temperature Control Contractor, TCC.

Pulsating gas meter shall come equipped with dry contacts (2 wire Form A, single channel; 3 wire Form C, dual channel) that will enable among other things conversion of the pulse signal outputs into therms of natural gas consumed. Coordinate request for the gas meter with the TCC.

  1. 7
    This contractor shall furnish and install gas sub-meter(s), which are to be integrated with the building management system (BMS). Interfacing gas sub-meters with the BMS shall allow for recording data on gas consumption, registering gas load trending and monitoring of gas pressure delivered to gas-burning equipments.

    1. Gas sub-meter(s) shall be positive displacement and rotary type with pulse out signals and shall be capable of measuring natural flows with low pressure drop across the sub-meter. Gas sub-meter(s) shall be designed with high rangeability at 40:1 and 1% accuracy. Sub-meter(s) shall contain inherent feature that provides for temperature compensation. Enclosure for digital display shall be UV resistant polycarbonate and ambient temperatures ranging from -40°F to 160°F shall have no effect on sub-meters performance.

    1. Approved model #: Elster American Meter Company – Series RPM with Honeywell TCI.

    1. Sub-meter(s) shall meet the following codes and standards:

        1. ASME Boiler & pressure Vessel Code, Section VIII

        1. ANSI B16.5 Flanged Pipe & Fittings

        1. ANSI B31.8 Gas Piping

        1. ANSI B109.3 Rotary Gas Meters (92)

        1. 49 CFR 192 Min. Federal Safety Standards

        1. Underwriter’s Laboratory (UL)

    1. Temperature correction feature shall be provided for sub-meter to compensate for variations in density and to avoid the resulting metering errors.

        1. LCD display of input gas temperature -40°F to 160°F

        1. Continuous fix factor correction for pressure

        1. Membrane push button and user-configurable alphanumeric LCD for display of: test, uncorrected volume, corrected volume, fixed–set pressure, live temperature, battery voltage, live flow and electronic uncorrected backup.

        1. Programmable call-in (scheduled and on alarms)

        1. Field–programmable firmware through serial port or infrared port

        1. Two Form-A volume pulse outputs and one Form–A alarm pulse output.

        1. Audit- trail memory – 40 days of daily corrected volume, uncorrected volume, and average temperature

        1. Low power requirements – 4 year + on four (4) D-cell alkaline batteries

  1. Gas Pressure Transmitter

1. This device is furnished, installed and wired by the temperature control contractor (TCC). Plumbing contractor shall provide a fitting for insertion of the gas pressure sensor into the supply header piping to gas-fired equipment.


A. Types

1. Service Pressure Regulator(s): Gas service pressure regulator(s) shall be as provided by the serving utility company.

    1. 15
      Line Pressure Regulator(s): Line pressure regulator(s) shall be provided for precise control of the gas pressure and flow rate delivered to gas-burning appliances.

a. Regulators shall be installed where line pressure exceeds the gas pressure ratings for appliances supplied thereof and as shown on Drawings.

b. Regulators shall be required to ensure protection for gas-fired appliances against emergency gas exposure of at least 2 psig.
c. Regulators shall comply with ANSI Z21.80 and fabricated with internal parts that are corrosion–resistant. Regulators shall be capable of maintaining outlet pressure under no flow condition or dead end lock up situation. Approved model # shall be GOVERNOR by Pietro Fiorentini or other approved equal.
B. Venting of Gas Regulators: If located indoors, gas pressure regulators shall have an independent vent pipe routed to the outside of the building. The vent pipe shall be arranged so as to preclude the entry of water or foreign objects. Separate vent piping is not required if the regulator is less than 1¼”, is equipped with and is labeled for utilization with approved vent-limiting device installed as per the manufacturer’s recommendations.



  1. A braided flexible stainless steel multiple legs pipe assembly shall be installed in gas piping system passing through a building seismic joint or building expansion joint. When required, the flexible pipe connector shall also be provided between floors to restrain vertical displacement in gas piping arrangement that is caused by a seismic event.

  1. Flexible stainless pipe connector shall incorporate multiple leg sections that are formed on annular corrugated stainless steel hose. The connector shall compensate for pipe movements in 6 degrees of freedom: 3 coordinate axes, plus simultaneous rotation around those axes. Connector shall be capable to restrain displacement without failure due to seismic forces and is subject to special inspection as required by Section BC 1707.7 of the 2014 NYC Building Code and Section FGC 403.5.2.

  1. Provide acceptance by the Office of Technical Certification and Research (OTCR) to utilize this flexible connector for seismic resistance in gas piping in NYC. In addition, connector shall be tested, listed and labeled to UL 536-2003 by an approved agency. Acceptable braided flexible stainless steel pipe connector shall be similar to TRI-FLEX LOOP as manufactured by Flex Hose.


  1. General Requirements

1. Underground steel gas piping, in addition to being mill-wrapped, shall be cathodically protected for safeguarding against corrosion caused by contact with the ground and as per the requirements of the serving utility company. Cathodic protection is required on both underground service as well as underground distribution gas piping.

2. This contractor shall hire an engineer or a specialist to design the cathodic protection system. The developed cathodic protection plan shall conform to standards, drawings, rules and regulations established by the serving utility company for pipe corrosion control and cathodic protection.

  1. 10
    This contractor is responsible for securing from the serving utility company all necessary approvals and affidavit for “New Steel Gas Pipe Corrosion Record” that CID/BCC may require before granting the “Pink/Blue Card” that allows the utility to activate the gas service.

  1. System Components

Cathodic protection intended for underground steel gas piping installation shall include but not be limited to:

    1. Coating

Factory-installed mill wrapped piping needs not be coated unless the wrapping becomes loose or section of the piping or fitting becomes bare during the installation. Apply coating specified by the serving utility company, such as mastic, cold tape or hot coal tar enamel.

      1. 11
        For projects where National Grid is the serving utility, acceptable coating products are:

1) Polyken Technologies Pipeline Primer #1027 in conjunction with Polyken Tape #936 or Polyken Gas UtilityTape or equal. OR

2) Tapecoat Company CT Coldprime in conjunction with Tapecoat Pipe Tape H-30 or H-50.

      1. 11
        For projects where Con Ed is the serving utility, use:

1) For pipe less than and equal to 4 inches in diameter

a) X-Tru:Bredero Price Co. or Liberty Coating Company
b) Pritec: Bredero Price Co. or Liberty Coating Company
2) For pipe sizes 6 inches and larger
1. Pritec: Bredero Price Co. or Liberty Coating Company

    1. Insulating Joints

Provide for electrical isolation of underground steel pipe with above-ground steel pipe. Location of insulators shall be guided by criteria imposed by the serving utility.

    1. Electrical Continuity

Provide bonding wire, wire connector and thermit weld (aka “cadweld”) for preservation of electrical continuity across couplings, valves and fittings that connect the underground steel pipe.

    1. Magnesium Anodes

Size selection and required number of anodes shall be based upon pipe diameter, length of run and other guidelines enforced by the serving utility company. Magnesium anodes must be provided with #10 AWG copper wire and be thermite welded to the underground gas pipe. Copper wire must carry black insulation

a. Minimum anode size for pipe within National Grid territory, irrespective of the size of the pipe diameter and up to 10 feet of pipe run, is 3 pounds.

b. The minimum anode size for pipe within Con Ed territory is 17 pounds.
5. Test Stations
Provide at ends of underground pipe runs test stations to monitor the effectiveness of the installed cathodic protection system. Test stations shall be made up by #10 AWG copper wire (white insulation) that is thermite welded to the underground pipe and anode wires (black insulation) that are all spliced inside an easily accessible 4” X 4” electrical box with cover.
6. Pipe Tracer
For safety and to facilitate detection of buried gas piping during future soil excavation, provide pipe tracer. Tape labeled “Warning – Buried Gas Lines Below” shall be placed at a minimum 1 foot on top of the installed piping and it shall be routed the length of the pipe run.

Share with your friends:
  1   2

The database is protected by copyright © 2020
send message

    Main page