USACE / NAVFAC / AFCESA / NASA UFGS-33 61 14 (April 2006)
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Preparing Activity: NAVFAC Replacing without change
UFGS-02557 (August 2004)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 33 61 14
EXTERIOR BURIED PREINSULATED WATER PIPING
04/06
NOTE: This guide specification covers the requirements for exterior buried
factory-prefabricated preinsulated water piping system.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
NOTE: This guide specification includes requirements for hot domestic water
piping, recirculating hot domestic water piping, chilled water piping, chilled-hot
(dual temperature) water piping, and hot water piping from heat exchangers to
each building. System design must conform to Unified Facilities Criteria (UFC)
3-430-09N, "Exterior Mechanical Utility Distribution."
NOTE: On the drawings, show:
1. Configuration, slope, and sizes of each piping system;
2. Locations and details of expansion loops, thrust blocks, anchors, and connections
between metal flanges and plastic carrier piping;
3. Trench cross section, sand bedding, and depth of bury; and
4. Detail sections of piping through manholes, walls, floors, entrance to buildings,
and watershed to aboveground piping.
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
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to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[ASME INTERNATIONAL (ASME)ASME B16.11(2005) Forged Fittings, Socket-Welding and ThreadedASME B16.18(2001; R 2005) Cast Copper Alloy Solder Joint Pressure FittingsASME B16.22(2001; R 2005) Standard for Wrought Copper and Copper Alloy Solder Joint Pressure FittingsASME B16.24(2006) Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 400, 600, 900, 1500, and 2500ASME B16.5(2003) Standard for Pipe Flanges and Flanged Fittings: NPS 1/2 Through NPS 24ASME B16.9(2007) Standard for Factory-Made Wrought Steel Buttwelding FittingsASME B31.1(2007; Addenda 2008) Power Piping][ASTM INTERNATIONAL (ASTM)ASTM A 106/A 106M(2008) Standard Specification for Seamless Carbon Steel Pipe for High-Temperature ServiceASTM A 193/A 193M(2008b) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature ServiceASTM A 194/A 194M(2008b) Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High-Pressure or High-Temperature Service, or BothASTM A 53/A 53M(2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessASTM B 32(2008) Standard Specification for Solder MetalASTM B 88(2003) Standard Specification for Seamless Copper Water TubeASTM B 88M(2005) Standard Specification for Seamless Copper Water Tube (Metric)ASTM D 1330(2004) Rubber Sheet GasketsASTM D 1784(2008) Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) CompoundsASTM D 1785(2006) Standard Specification for Poly(Vinyl Chloride) (PVC), Plastic Pipe, Schedules 40, 80, and 120ASTM D 229(2001) Rigid Sheet and Plate Materials Used for Electrical InsulationASTM D 2466(2006) Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40ASTM D 2564(2004e1) Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping SystemsASTM D 2996(2001; R 2007e1) Filament-Wound "Fiberglass" (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe]1.2 SYSTEM DESCRIPTION
NOTE: For LANTNAVFACENGCOM projects, refer to LANTNAVFACENGCOM regional Section
15700, "Heating, Ventilating, and Cooling Systems."
Provide [new and modify existing] exterior buried factory-prefabricated preinsulated water piping system to the
first piping connection aboveground or within each building complete and ready for operation. Piping system
includes [hot domestic water piping,] [recirculating hot domestic water piping,] [chilled water piping,] [chilled-hot
(dual temperature) water piping,] [hot water piping,] and related work [from heat exchanges to each building].
[Hot domestic water piping within each building is specified under Section 22 00 00 PLUMBING, GENERAL PURPOSE.]
[Chilled water piping, chilled-hot water piping, and hot water piping within each building is specified under]
[Section 23 64 26 CHILLED, CHILLED-HOT, AND WATER PIPING SYSTEMS].
1.3 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] The following shall
be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Factory-prefabricated preinsulated water piping system
Preinsulated plastic pipe field joints
Show layout of piping system. Drawings must have Professional Engineer Seal.
SD-03 Product Data
Pipe, fittings, and end connections
Factory-prefabricated preinsulated water piping system
Plastic reinforced thermosetting resin (RTR) piping
SD-07 Certificates
Certification of welders' qualifications
SD-08 Manufacturer's Instructions
Installation manual for buried factory-prefabricated preinsulated water piping system
1.4 QUALITY ASSURANCE
1.4.1 Certification of Welders' Qualifications
Submit prior to site welding of steel piping; certifications shall be not more than one year old.
PART 2 PRODUCTS
2.1 BURIED FACTORY-PREFABRICATED PREINSULATED WATER PIPING SYSTEM
Piping (pipe, fittings, and end connections) system shall be suitable for working pressure of 862 kPag at 121
degrees C 125 psig at 250 degrees F, except plastic polyvinyl chloride (PVC) chilled water piping shall be suitable
for working pressure of 862 kPag at 24 degrees C 125 psig at 75 degrees F. Piping system shall withstand H-20
highway loading with 600 mm 2 feet of compacted backfill over top of conduit. Mark each section of conduit with
fabricator's name, product identification, and publications to which the items conform. Provide each section
of carrier pipe including factory-applied insulation and conduit, with waterproof conduit ends at both ends of
each section of carrier pipe, except for piping systems which have the field joints insulated and covered with
waterproof shrink sleeves.
2.1.1 Factory-Applied Insulation
Polyurethane or polyisocyanate insulation, minimum density of 27.2 kg per cubic meter 1.7 pcf, rated for not
less than 121 degrees C 250 degrees F, completely filling space between carrier pipe and conduit.
2.1.2 Factory-Applied Conduit
Conduit material, size, and thickness shall be as follows:
Minimum Minimum
Carrier Pipe Conduit Size Conduit Thickness
(mm) (mm) (mm)
50 mm 100 mm 1.5 mm
75 mm 150 mm 1.5 mm
100 mm 200 mm 2.0 mm
150 mm 250 mm 2.5 mm
200 mm 300 mm 3.0 mm
250 mm 350 mm 3.0 mm
Minimum Minimum
Carrier Pipe Conduit Size Conduit Thickness
(Inches) (Inches) (Inches)
2 4 0.060
3 6 0.060
4 8 0.080
6 10 0.100
8 12 0.120
10 14 0.120
a. Plastic PVC pipe conduit: ASTM D 1784, Class 12454-B compound extruded seamless PVC plastic
pipe.
b. Plastic RTR pipe conduit: ASTM D 2996, filament-wound, fiberglass RTR plastic pipe, without
liner.
c. Plastic RTR factory lay-up conduit: Conduit shall be machine-applied continuous rovings
of fiberglass strands saturated with isophthalic polyester or epoxy resin filament wound in
helical pattern directly to the outer surface of the pipe insulation. In lieu of minimum conduit
size for each size of carrier pipe, provide minimum of 25 mm one inch thick insulation for 50
mm 2 inch carrier pipe and provide minimum of 38 mm 1.5 inch thick insulation for 75 mm 3 inch
and larger carrier pipe.
2.1.3 Factory-Applied End Seals
Provide watertight end seal, or factory lay-up type end seal between carrier pipe and conduit. Provide sufficient
surface bonding area between carrier pipe and conduit to ensure permanent watertight end seal suitable for use
with temperature limits of carrier pipe.
2.1.4 Factory-Prefabricated Carrier Piping
Pipe, fittings, flanges, and couplings shall be marked with manufacturer's name, product identification, and
publication to which items conform. Carrier piping shall be as specified in this section. Buried carrier pipe
connections between straight sections of pipe beyond 1.5 m 5 feetexterior of buildings may be manufacturer's
standard O-ring connections designed to absorb pipe expansion and contraction at working pressure of 862 kPag
125 psig with no leakage. Connections at elbows and tees shall be other than O-ring connections.
2.2 CARRIER PIPING
2.2.1 Copper Tubing
Provide copper tubing for hot domestic water piping, recirculating hot domestic water piping, chilled water piping,
chilled-hot water piping, and hot water piping.
a. Copper tubing: Provide ASTM B 88M ASTM B 88, Type L or M copper tubing for buried factory-prefabricated
preinsulated piping and for aboveground piping. Provide ASME B16.18 or ASME B16.22 solder joint
fittings, unions, and flanges; provide adapters as required.
b. Solder for copper tubing: Provide ASTM B 32, 95-5 tin-antimony solder or provide Plumbing
Code approved lead-free solder.
c. Flanged connections: Provide ASME B16.24, Class 150, solder joint flat face flanged connections.
d. O-ring connections: Provide between straight sections of pipe beyond 1.5 m 5 feet of exterior
of buildings.
2.2.2 Steel Piping
Provide steel piping for chilled water piping, chilled-hot water piping, and hot water piping.
a. Steel pipe: Provide ASTM A 53/A 53M, Type E (electric-resistance welded, Grade A or B),
ASTM A 53/A 53M, Type S (seamless, Grade A or B), or ASTM A 106/A 106M (seamless, Grade A or
B). Provide Weight Class STD (Standard) or Schedule No. 40 black steel pipe for welding end
connections. Provide Weight Class XS (Extra Strong) or Schedule No. 80 black steel pipe for
threaded end connections.
b. Steel pipe fittings: Provide ASME B16.9 buttwelding fittings of the same material and weight
as the piping in which fittings are installed. Provide ASME B16.11 socket welding fittings.
c. Steel pipe flanges: Provide ASME B16.5, Class 150 flanges.
d. O-ring connections: Provide between straight sections of pipe beyond 1.5 m 5 feet of exterior
of buildings.
2.2.3 Plastic Reinforced Thermosetting Resin (RTR) Piping
Provide plastic RTR piping for hot domestic water piping, recirculating hot domestic water piping, chilled water
piping, chilled-hot water piping, and hot water piping.
a. Plastic carrier pipe, fittings, and adhesive: Provide plastic carrier piping conforming
to the Federal Agency Approved Brochure. Pipe, fittings, and adhesive shall be supplied by same
manufacturer. Pipe, fittings, flanges, and couplings shall have end connections of the adhesive
bell and spigot type. Threaded piping, including pipe, fittings, flanges, and couplings, will
not be permitted.
b. Flanged connections: Provide flat face flanged connections between plastic piping and metal
piping. Plastic flanges shall be suitable for connecting to ASME Class 150 flanges.
c. Plastic RTR piping sizes: When piping sizes other than 50, 75, 100, 150, 200 mm 2, 3, 4,
6, and 8 inches are indicated, provide next larger piping size. The connecting system piping
shall be of the same size or increased to meet next size of RTR piping.
2.2.4 Plastic PVC Piping
Provide plastic PVC piping only for chilled water piping.
a. Plastic PVC carrier pipe, fittings, and cement: ASTM D 1785pipe, ASTM D 2466 socket type
fittings, and ASTM D 2564solvent cement shall be supplied by the same manufacturer. Pipe, fittings,
flanges, and couplings shall have solvent cement socket end connections, except piping beyond
1.5 m 5 feet outside of buildings shall have O-ring connections. Plastic PVC piping shall
be suitable for working pressure of 862 kPag at 24 degrees C 125 psig at 75 degrees F.
b. Flanged connections: Provide flat face flanged connections between plastic piping and metal
piping. Plastic flanges shall be suitable for connecting to ASME Class 150 flanges.
c. O-ring connections: Provide between straight sections of pipe beyond 1.5 m 5 feet of exterior
of buildings.
2.3 FLANGED CONNECTIONS
Provide ASME Class 150 flat face flanged connections.
a. Gaskets: ASTM D 1330, except Shore A durometer hardness shall be 55 to 65, 3 mm 0.125 inch
thick ethylene propylene. Provide one piece factory cut full-face gaskets.
b. Bolts: ASTM A 193/A 193M, Grade B7. Extend minimum of two full threads beyond nut with
bolts tightened to required torque.
c. Nuts: ASTM A 194/A 194M, Grade 7, with Teflon coated threads.
d. Washers: Provide galvanized steel flat circular washers under bolt heads and nuts.
e. Electrically isolating (insulating) gaskets for connections between metal flanges: Provide
ASTM D 229 electrical insulating material of 1000 ohms minimum resistance. Provide one piece
factory cut insulating gaskets between flanges. Provide silicon-coated fiberglass insulating
sleeves between bolts and holes in flanges; bolts may have reduced shanks of diameter not less
than diameter at root of threads. Provide 3 mm 0.125 inch thick high-strength insulating washers
next to flanges and provide stainless steel flat circular steel washers over insulating washers
and under bolt heads and nuts. Provide bolts 13 mm 0.5 inch longer than standard length to
compensate for thicker insulating gaskets and washers under bolt heads and nuts.
2.4 BURIED WARNING AND IDENTIFICATION TAPE
Provide detectable aluminum foil plastic backed tape or detectable magnetic plastic tape manufactured specifically
for warning and identification of buried piping. Tape shall be detectable by an electronic detection instrument.
Provide tape in rolls, 75 mm 3 inches minimum width, color coded for the utility involved with warning and identification
imprinted in bold black letters continuously and repeatedly over entire tape length. Warning and identification
shall read "CAUTION BURIED PREINSULATED WATER PIPING BELOW" or similar wording. Use permanent code and letter
coloring unaffected by moisture and other substances contained in trench backfill material.
2.5 CONCRETE THRUST BLOCKS
Provide concrete thrust blocks as specified in Section 03 30 00 CAST-IN-PLACE CONCRETE. Concrete shall be of
27.6 MPa 4000 psi minimum 28 day compressive strength, air-entrained admixture (0.13 kg per cubic meter) (3.6
ounces per cubic yard) with water-reducing admixture (0.81 kg per cubic meter) (22 ounces per cubic yard).
2.6 PIPE SLEEVES
Provide where piping passes entirely through walls and floors. Provide sleeves of sufficient length to pass
through entire thickness of walls and floors. Provide 25 mm one inch minimum clearance between exterior of piping
or pipe insulation, and interior of sleeve or core-drilled hole. Firmly pack space with mineral wool insulation.
Seal space at both ends of sleeve or core-drilled hole with plastic waterproof cement which will dry to a firm
but pliable mass, or provide mechanically adjustable segmented elastomeric seal. In fire walls and fire floors,
seal both ends of sleeves or core-drilled holes with UL listed fill, void, or cavity material.
a. Sleeves in masonry and concrete walls and floors: Provide hot-dip galvanized steel, ductile-iron,
or cast-iron sleeves. Core drilling of masonry and concrete may be provided in lieu of sleeves
when cavities in the core-drilled hole are grouted smooth.
b. Sleeves in other than masonry and Concrete walls and floors: Provide 0.5 mm 26 gage galvanized
steel sheet.
2.7 ESCUTCHEON PLATES
Provide split hinge type metal plates for piping entering walls and floors in exposed spaces. Provide polished
stainless steel plates or chromium-plated finish on copper alloy plates in finished spaces. Provide paint finish
on metal plates in unfinished spaces.
PART 3 EXECUTION
3.1 INSTALLATION
Installation of exterior buried factory-prefabricated preinsulated water piping systems shall be in accordance
with manufacturer's installation manual. Welding of steel piping including qualification of welders shall be
in accordance with ASME B31.1, metallic arc process. Deviations shall not be permitted unless authorized in
writing by Contracting Officer. Install piping straight and true to bear evenly on sand bedding material. Installation
and field assembly of plastic RTR piping shall be in accordance with the Federal Agency Approved Brochure.
a. Cleaning of piping: Keep interior and ends of new piping and existing piping affected by
the Contractor's operations, cleaned of water and foreign matter during installation by means
of plugs or other approved methods. When work is not in progress, securely close open ends
of pipe and fittings to prevent entry of water and foreign matter. Inspect piping before placing
into position.
b. Demolition: Remove materials so as not to damage materials which are to remain. Replace
existing work damaged by the Contractor's operations with new work of the same construction.
3.2 FIELD JOINTS
a. Carrier piping joints without concrete anchor: Pressure test and approve piping joints.
Provide joints with polyurethane or polyisocyanate insulation of same type and thickness as
insulation on carrier piping. Provide waterproof shrink sleeves to cover insulation and overlap
not less than 150 mm 6 inches of each end of conduit section.
b. Carrier piping joints with concrete anchor: Pressure test and approve piping joints. Provide
each elbow and tee with concrete anchors (thrust blocks). Provide waterproof end seals between
carrier piping and conduit adjacent to each carrier pipe fitting. Encase carrier pipe fitting
and at least 50 mm 2 inches of each end of conduit with a minimum of 150 mm 6 inches of concrete.
3.3 BURIED FACTORY-PREFABRICATED PREINSULATED PIPE INSTALLATION
a. Assembly and alignment: Assemble carrier pipe and fittings according to manufacturer's
installation manual; assemble plastic RTR piping in accordance with the Federal Agency Approved
Brochure. Maintain proper alignment during assembly of joints.
b. Bedding: Accurately grade trench bedding with a minimum of 150 mm 6 inches of manufactured
or natural sand. Backfill sand to a minimum of 150 mm 6 inches above and below conduit. Lay
bedding to firmly support conduit along entire length.
c. Concrete thrust blocks: Encase each elbow and tee of carrier pipe in thrust block with
minimum of 0.28 square meter 3 square feet of thrust-bearing surface cast against undisturbed
soil, minimum pipe-to-bearing surface single dimension of 250 mm 10 inches perpendicular to
bearing surface, and minimum volume of 0.25 cubic meter 9 cubic feet, except as indicated otherwise.
Disturbed soil under and around thrust blocks shall be compacted.
3.4 FIELD QUALITY CONTROL
Before final acceptance of work, test each system to demonstrate compliance with contract requirements. Thoroughly
flush and clean piping before placing in operation. Flush piping at minimum velocity of 2.4 meters per second
8 fps. Correct defects in the work and repeat tests until work is in compliance with contract requirements.
Furnish potable water, electricity, instruments, connecting devices, and personnel for tests.
a. Field tests of carrier piping: Do not cover carrier piping joints with insulation or concrete
anchors (thrust blocks), until carrier piping joints pass field tests.
b. Hydrostatic pressure test: Test piping system at 1379 kPag 200 psig for minimum holding
period of 2 hours during which time pressure shall not drop more than 28 kPa 4 psi; test plastic
RTR piping in accordance with Federal Agency Approved Brochure. Pressure drop greater than
28 kPag 4 psicorrected for temperature variation constitutes failure. Valve off piping system
and disconnect method of piping system pressurization before starting the 2 hour pressure holding
period. During hydrostatic pressure test, examine piping system for leaks. Repair leaking joints,
replace damaged and porous pipe and fittings with new materials, and repeat tests.
c. Thrust blocks: If O-ring connections are used, provide temporary thrust blocks prior to
hydrostatic pressure testing of piping system. Place bedding and backfill around center portion
of piping system, leaving thrust blocks and field joints clear for observation. After successful
completion of hydrostatic pressure test, cast concrete thrust blocks.
d. Field inspections: Prior to initial operation, inspect piping system for compliance with
drawings, specifications, and manufacturer's submittals.
3.5 DISINFECTION
Disinfect new hot domestic water piping under Section 22 00 00 PLUMBING, GENERAL PURPOSE.