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SECTION 15171 - VARIABLE FREQUENCY DRIVES 5.23.10 FACILITY FUEL SYSTEMS
DESIGN AND CONSTRUCTION STANDARD






Design and Construction Standards, Revised
November
, 2007
5.23.10-1

PART 1:
GENERAL

1.01 Purpose:

This standard is intended to provide useful information to the Professional
Service Provider (PSP) to establish a basis of design. The responsibility of the
engineer is to apply the principles of this section such that the University may
achieve a level of quality and consistency in the design and construction of
their facilities. Deviations from these guidelines must be justified through
LCC analysis and submitted to the University for approval.

1.02 References:

A.
Codes and Standards that are Standard at the University:

1.

AGA Compliance: LC 1-91 Interior Fuel Gas Piping Systems

2.

ANSI Compliance: Fabricate and install natural gas piping in
accordance with ANSI Z223.1 "National Fuel Gas Code", Z21.15
Gas Valves, Z21.18 Pressure Regulators, Z2121.21 Automatic
Valves for Gas Appliances, Z21.80 Line Pressure Regulators,
B109.1 and B109.2 Meters and ANSI 144 Boilers.


4.

NFPA Compliance: Fabricate and install natural gas systems in
accordance with NFPA 54 "Natural Fuel Gas Code" and NFPA 30
Flammable and Combustible Liquids.

6.

Utility Compliance: Design and install natural gas systems in
accordance with local gas utility company.

8.

Code Compliance: Design and install natural gas systems in
accordance with International Fuel Gas Code requirements as well as
all local amendments.

9.

FM Global and IRI Compliance: Factory Mutual Insurance and
Industrial Risk Insurers.

1.03 Requirements:

A.

Design system to achieve a minimum pressure drop of .05 inches w.c., with a
minimum pressure down stream of the meter at 7 inches w.c. to 14 inches w.c.
and a maximum operating pressure of 5 psig pressure downstream of the
meter. Higher operating pressure requires pre approval from U.T. Facilities
Services.
5.23.10 FACILITY FUEL SYSTEMS
DESIGN AND CONSTRUCTION STANDARD






Design and Construction Standards, Revised
November
, 2007
5.23.10-2
B.

Design shall include all information required by the Authority Having
Jurisdiction and UT Facilities Services and Utilities departments.

C.

Design shall include piping layout indicating total equivalent length pipe and
all connected equipment, total friction loss in piping system and equipment
demand capacities (total connected load) throughout piping system.

D.

Indicate minimum pressure requirements at outlet of meter, extent of work to
be completed by utility company, meter location, work required by owner to
allow meter assembly to be installed, all site information including building
location, gas service location (utility supply mains), any low pressure cutoff
requirements, equipment with pilot lights and all future equipment and
capacities.

E.

Provide sleeved pipe runs through enclosed spaces, plenums and above
corridor ceilings. Ventilate sleeve on both ends to exterior of building. Route
piping exposed in ventilated spaces where possible.

F.

Base pressure ratings on natural gas piping system maximum design
pressures.

G.

Provide pipe identification complying with ANSI A13.1 Scheme for
Identification of Piping Systems in accordance with the following:

1.

Building Distribution Piping: Plastic pipe markers
2.

Gas Service: Underground type plastic line markers
3.

Gas Valves: Plastic valve tags

H.

Gas piping entering a building shall first rise above grade exterior to the
building and be provided with a wrench operated shutoff valve in the
horizontal portion of the exterior piping.

I.

It shall be the Contractors responsibility to make all arrangements and pay for
all services, fees, and material which are required to have the gas company
extend its gas main to the property line and to install the regulator and/or meter
required for the project.

J.

Verify and coordinate, with the actual various users on the site, all the times and
timing involved with modification, additions to, or alterations thereof, of gas
piping serving these users

K.

The gas regulator bypass globe valve shall be sized to provide a pressure drop
equal to the regulator when fully open. It shall include provision for locking
shut with a large padlock.

L.

Provide a wrench operated plug cock valve at the inlet and discharge side of the 5.23.10 FACILITY FUEL SYSTEMS
DESIGN AND CONSTRUCTION STANDARD






Design and Construction Standards, Revised
November
, 2007
5.23.10-3
gas meter and pressure regulators and at building entrance.

M.

Provide zone valves on each floor accessible to occupants for shutting off areas
of the building under emergency conditions. Gas piping shall be welded up to
these zone valves.

N.

Provide non-conducting dielectric connections wherever jointing dissimilar
metals.

O.

Route piping in orderly manner to conserve building space and not to interfere
with use of space. Maintain gradient and group piping wherever practical at
common elevations.

P.

Design piping to allow for expansion and contraction without stressing pipe,
joints, or connected equipment.

Q.

Route piping parallel to other piping. Maintain a minimum of 12" clearance
between gas piping and steam or hydronic piping above 200 degrees F.

R.

Provide shutoff gas cock and drip leg at each gas-fired equipment connection.
Comply with equipment manufacturer's instructions.

S.

Provide gas shutoff outside building, upstream of meter, at pipe entry to
building in adjustable gas service valve box with cover set flush to finish
grade.

T.

Provide access where valves and fittings are not exposed. Coordinate access
door location with architectural features.

U.

Establish elevations of buried piping outside the building to ensure a minimum
of cover.

V.

Provide protective bollards for gas meter installations, horizontally spaced no
more than four feet apart and 36 high. Bollards should be constructed of
galvanized steel, 6 diameter, with a minimum 0.25 wall thickness, or 4
diameter concrete-filled, schedule 40 galvanized steel pipe. Bollards should be
permanent-type, epoxy primed and painted, and anchored to 18" X 42" concrete
foundation with ASTM 3/4" x 12" ASTM - A36 galvanized L hook anchor bolts.

PART 2
PRODUCTS

2.01 Pipe and pipe fittings:

A.

All pipe used for the fabrication of gas piping systems shall be Schedule 40
black steel pipe ASTM A-53.
5.23.10 FACILITY FUEL SYSTEMS
DESIGN AND CONSTRUCTION STANDARD






Design and Construction Standards, Revised
November
, 2007
5.23.10-4
B.

Unless otherwise specifically required, all steel pipe provided for gas piping
systems shall be provided with plain ends and assembled with weld fittings on
all pipe 1-1/4" and larger and 3/4" and larger if before the emergency shut off
valve. No pipe smaller than 3/4", except as detailed for laboratory furniture,
shall be used. From the emergency shutoff valve to the outlets, the pipe shall be
assembled with threaded fittings provided all joints are exposed or within the
confines of the laboratory furniture.

C.

Machine wrap pipe using 50% overlap wrap, with polyvinyl chloride tape.
Hand wrap fittings using 100% overlap wrap extending 6" beyond fitting onto
wrapped pipe. Comply with tape manufacturer's installation instructions.
Installation standards and procedures of the utility company shall be strictly
followed. At a point 6' from the building and the final riser to meter or building
entrance point shall be wrapped steel.

D.

Unless otherwise specifically shown or called for, gas piping systems installed
throughout the building shall be fabricated by a fusion welding process making
use of welding fittings. These fittings shall be fittings as specified in other
Sections. In no case shall the wall thickness of a fitting incorporated in a gas
piping system be less than that of the pipe to which it is jointed.

2.02 Valves:

A.

Gas Cocks 2 and smaller shall be AGA approved 150 PSI non-shock WOG,
bronze straightway cock, flat or square head with threaded ends.

B.

Gas cocks 2-1/2 and larger shall be AGA approved 125 PSI non-shock
WOG, iron body bronze mounted, straightway cock, square head with flanged
ends.

C.

Master control valve shall be packless, single seat, bronze body, explosion-
proof solenoid operated. It shall be normally closed, UL approved, 120 volt,
with automatic reset.

D.

Control station shall be pushbu