Chrysler LLC - ME Building Group
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Construction Standards
Reviewed : Oct. 2010
SECTION 15420 - SIPHONIC ROOF DRAINAGE
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
SUMMARY
A.
This specification section describes the technical specification and general instructions
for the fabrication, handling, delivery and installation of a siphonic roof drainage system.
B.
Section Includes:
C.
1.3
1.
Siphonic roof drains,
2.
Pipe, fittings and couplings,
3.
Hangers, supports and bracing,
4.
Installation requirements,
5.
Supplemental steel,
6.
Construction tolerances,
7.
Integrity testing,
8.
Final inspections.
Section does not include:
1.
Conventional roof drainage,
2.
Sanitary waste and vent,
3.
Kitchen waste and vent,
4.
Other plumbing systems not related to roof drainage.
RELATED SECTIONS
A.
1.4
Drawings and general provisions of the Contract, including General Conditions, exhibits
and Division 1 specification sections, apply to this section.
Division 02 “Site Construction,”
REFERENCES
A.
American Iron and Steel Institute (AISI)
B.
American National Standards Institute (ANSI)
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C.
1.
B16.5 “Pipe Flanges and Flanged Fittings,”
2.
B18.2.1 “Square and Hex Bolts and Screws (Inch Series),”
3.
B18.2.2 “Square and Hex Nuts (Inch Series).”
American Society of Civil Engineers (ASCE)
1.
D.
E.
F.
Construction Standards
Reviewed : Oct. 2010
ASCE 7 “Minimum Design Loads for Buildings and Other Structures.”
American Society for Testing and Materials (ASTM)
1.
A48 “Standard Specification for Gray Iron Castings,”
2.
A74 “Standard Specification for Cast Iron Soil Pipe and Fittings,”
3.
A888 (CISPI 301) “Standard Specification for Hubless Cast Iron Soil Pipe and
Fittings for Sanitary and Storm Drain, Waste and Vent Piping Applications,”
4.
C564 “Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and
Fittings,”
5.
D1784 “Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds
and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds,”
6.
D1785 “Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe,
Schedules 40, 80, and 120,”
7.
F441/F441M-02 “Standard Specification for Chlorinated Poly(Vinyl Chloride)
(CPVC) Plastic Pipe, Schedules 40 and 80,”
8.
D2665 “Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain,
Waste, and Vent Pipe and Fittings,”
9.
ASTM D2855 “Standard Practice for Making Solvent-Cemented Joints with
Poly(Vinyl Chloride) (PVC) Pipe and Fittings,”
10.
ASTM D3311 “Standard Specification for Drain, Waste, and Vent (DWV) Plastic
Fittings Patterns,”
11.
E-814 (ANSI/UL-1479) “Standard Method of Fire Tests for Through Penetration
Fire Stops,”
Cast Iron Soil Pipe Institute (CISPI)
1.
Designation 301, “Standard Specification for Hubless Cast Iron Soil Pipe and
Fittings for Sanitary and Storm Drain, Waste and Vent Piping Applications”
(ASTM B888),
2.
Designation 310, “Hubless Couplings,”
Steel Deck Institute (SDI)
1.
Design Manual for Composite Decks, Form Decks and Roof Decks,
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G.
2.
Manual of Construction with Steel Deck,
3.
Standard Practice Details.
Underwriters Laboratory
1.
1.5
UL Fire Resistance Directory
SYSTEM DESCRIPTION
A.
B.
1.6
Construction Standards
Reviewed : Oct. 2010
General
1.
This siphonic roof drainage system is classified as an “Alternative Engineered
Design”.
2.
This is an engineered system. Guidance for the installation of this system is
supplied by this specification and the related Drawings. The performance of this
system is related directly to the pipe configuration, pipe diameters, elevations,
fittings and orientation. Any changes to the pipe configuration outside of
specified tolerances are required to be examined and approved by the Designer
prior to installation.
3.
Proper installation of this system requires a detailed set of fabrication drawings
including relationship to surrounding structure, mechanical systems, etc. Such
fabrication drawings shall include pipe cut lengths for each pipe segment.
Basis of Design
1.
This system is designed to drain rainwater from the roof at a rate equal to or
greater than 2.8 inches per hour of rainfall.
2.
The depth of water on the roof around the roof drains at dimensional rainfall
intensity is 3.0” to 3.5”.
SUBMITTALS
A.
B.
General
1.
Submit product data, shop drawings and other related documentation in
accordance with the conditions of the Contract.
2.
Submit six (6) legible copies of all shop drawings and fabrication drawings to the
Designer.
3.
Draw shop drawings at a scale of 3/8” = 1’-0”. Indicate pipe centerline elevations
referenced to the project elevation datum. Indicate pipe distances from columns
and fixed walls.
4.
Submit shop drawings and fabrication drawings on a schedule to allow ten (10)
business days for Designer review.
Submit Product Data
1.
Product data submittal shall include all components including, but not limited to:
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2.
C.
D.
b.
Drain installation procedures,
c.
Pipe and fittings,
d.
Couplings, joint methods, gaskets,
e.
Hangers and supports,
f.
Supplemental steel,
Closeout Submittals
a.
Actual as-built drawings,
b.
Operation and Maintenance Manuals,
c.
Pipe integrity test reports,
d.
Siphonic drain manufacturer flashing warrantee,
e.
Final inspection reports.
1.
Submit scale drawings showing physical layout of piping in plan view and
elevation view. Include references for pipe elevation, distance from columns, and
pipe cut lengths for each pipe section.
2.
Drawings shall be to scale with 3/8” equal to one foot.
3.
Overlay structural, architectural, MEP and other building elements on shop
drawings to coordinate piping with potential obstructions or conflicts.
4.
Submit siphonic roof drain installation procedures including fastening to roof deck
and flashing clamp installation.
Submit Maintenance Data
Submit maintenance instructions for inclusion in Operating and Maintenance
Manuals.
QUALITY ASSURANCE
A.
1.8
Siphonic roof drains,
Submit Shop Drawings
1.
1.7
a.
Construction Standards
Reviewed : Oct. 2010
A plumbing contractor duly licensed with local and/or state authorities shall install the
siphonic roof drainage system.
DELIVERY, STORAGE AND HANDLING
A.
Hardware
1.
Retain shipping flange protective covers and protective coatings during storage.
2.
Protect components against damage.
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Construction Standards
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Comply with manufacturer’s rigging instructions for handling.
PART 2 - PRODUCTS
2.1
MANUFACTURERS
A.
Subject to compliance with requirements and Drawings, provide products from one of the
following manufacturers or vendors.
B.
Siphonic Roof Drains
C.
D.
E.
F.
2.2
1.
Jay R. Smith Manufacturing Co., Inc.
2.
No substitutions. Design is based on product-specific data.
Pipe and Fittings, Cast Iron
1.
Charlotte Pipe and Foundry Company,
2.
Tyler Pipe,
3.
Approved equal.
Pipe and Fittings, PVC
1.
Charlotte Pipe and Foundry Company,
2.
Approved equal.
Couplings, Siphonic, Pipe Class A888
1.
Husky,
2.
Clamp-All,
3.
Tyler,
4.
Mission,
5.
Approved equal.
Hangers
1.
B-Line,
2.
Carpenter – Patterson,
3.
Tolco,
4.
Approved equal.
SIPHONIC ROOF DRAINS (RD-1)
A.
Equal to Jay R. Smith Model No. 1005T (Series).
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B.
Drain body:
ASTM A 48 gray iron casting,
C.
Flashing clamp: ASTM A 48 gray iron casting with stainless steel fastening hex-nuts,
D.
Baffle:
vanes,
ASTM A 48 gray iron casting with fastening ring and integral anti-vortex
E.
Leaf Guard:
Polyethylene dome strainer.
F.
Spigot outlet:
Male NPT thread connection.
G.
Accessories:
Under-deck clamp, sump receiver pan.
H.
Compliant with the previsions of ANSI/ASME A112.6.9.
PIPE, FITTINGS AND COUPLINGS
PIPE CLASS A888
ITEM
SPECIFICATION
Pipe
Material
Pipe Standard
Wall Thickness
Product Marking
Material
Standard
Wall Thickness
End Connections
Description
Fittings
Joint
Flange
Reducers
Adaptors
Cast Iron.
ASTM A888 (CISPI 301), ASTM A74.
Service weight.
As described in ASTM A888.
Cast Iron.
ASTM A888 (CISPI 301)
Same as pipe.
No-hub.
No-hub multi-band heavy duty coupling with elastomer gasket and
fastening hardware.
Housing Material
Stainless steel.
Coating
Manufacturer standard enamel finish
Gasket
Neoprene (ASTM C564).
Fasteners
18-8 Stainless Steel, (ANSI B18.2.1 and ANSI B18.2.2)
Manufacturer/Model Husky, Tyler, Clamp-All.
Material
Ductile iron, ASTM A536.
Coating
Manufacturer standard enamel finish
Style
ANSI/B16.5 Class 150 dimensions.
Gasket
EPDM.
Pressure Rating
Not less than 230 psig at 73ºF.
ASTM A888. Concentric.
ASTM A888 (CISPI 301) tapped adapter, Table 65.
Steel x Cast Iron Mission adaptor coupling.
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PIPE CLASS D2665
ITEM
SPECIFICATION
Pipe
Material
Pipe Standard
Fittings
Joint
Flange
Reducers
Adaptors
2.4
Polyvinylchloride (PVC).
ASTM D2665 DWV and all referenced documents.
ASTM D1785 or F441 plain end pressure pipe for 2.5” diameter.
Wall Thickness
Schedule 40.
Product Marking
As described in ASTM D2665.
Material
Polyvinylchloride (PVC).
Standard
ASTM D2665. ASTM D3311 DWV pattern. D1784 of F441 for 2.5”
diameter.
Wall Thickness
Same as pipe.
End Connections
Socket.
Description
Solvent cemented socket joint.
Assembly
Per ASTM D2665 and D2885.
Material
Ductile iron, ASTM A536.
Coating
Manufacturer standard enamel finish
Style
ANSI/B16.5 Class 150 dimensions.
Gasket
EPDM.
Pressure Rating
Not less than 230 psig at 73ºF.
ASTM D3311. Reducer or bushing.
PVC. Threaded adaptor. FNPT to socket joint.
Steel x PVC Mission adaptor coupling.
HANGERS AND SUPPORTS
A.
Pipe hangers shall be equal to B-Line B3100 series standard clevis hanger. Galvanized
carbon steel.
B.
Hanger rods shall be secured to structure with B-Line B3205 threaded rod.
C.
Refer to details on Drawings, including structural drawings for requirements for
supplemental steel and reinforcing.
PART 3 - EXECUTION
3.1
GENERAL
A.
The performance of the siphonic roof drainage system is related directly to the pipe
configuration, including all lengths, diameters, fittings, offsets and reductions.
B.
Do not make changes to the pipe configuration outside of specified tolerances. The
Designer must validate any changes to the siphonic piping.
C.
Non-siphonic roof drainage piping shall be installed in accordance with the governing
plumbing code. Pipe changes conforming to the code and the intent of the design may
be made without Designer approval.
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INSTALLATION
A.
Install piping, hangers and drains in accordance with manufacturers’ recommendations.
B.
Piping shall be properly supported to prevent stress on pipe and couplings.
C.
Provide supplemental steel as shown on Drawings and specified under structural
specification sections and details for proper hanging from steel structure and for
reinforcing.
D.
Install siphonic drains to laser level precision. Each drain of a common downpipe shall
be installed with variation in sump body elevation within ±0.375 inches. Adjust drain
bodies up or down to achieve tolerance.
E.
Construction tolerances for siphonic pipe cut lengths shall be:
F.
1.
4” and smaller:
±4 inches
2.
5” and larger:
±8 inches
Cut siphonic pipe lengths to match dimensions as shown on the Drawings. Do not add
extra fittings or make additional offsets. If piping configuration requires modification to
avoid conflicts, notify the Designer prior to installation. The Designer will validate piping
changes and issue approved changes in writing.
1.
Dimensions shown on the drawings are intended to reinforce the importance of
the developed length of pipe segments on the overall performance of the
siphonic roof drainage system.
2.
Drawings and specifications do not reflect every element of the physical
installation and shall not be construed as perfect. Additional details may be
required and are anticipated during the construction process or during
preparation of fabrication drawings or other submittals.
3.
Minor adjustments to the piping system are to be expected. The dimensions
shown on the Drawings are not intended to convey an immutable design.
However, any minor changes outside the specified tolerances shall be validated
by the Designer.
4.
The Contractor is expected to have a reasonable number of questions about the
design intent or information provided on the Contract Documents.
G.
For metallic pipe, space hangers every 10 feet on center or every pipe length. For
thermoplastic pipe, space hangers every 4 feet on center. Provide hangers at every
change in direction.
H.
Provide lateral sway bracing every 30 feet for cast iron and every 15 feet for PVC and at
every change in direction for piping with hanger rod longer than 12 inches.
I.
Make trench bottoms smooth and of uniform grade with either undisturbed soil or a layer
of selected and compacted backfill so that no settlement will be encountered. Pipe shall
bear on this material throughout the entire length of its barrel.
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3.3
Construction Standards
Reviewed : Oct. 2010
Insulate all horizontal piping and vertical tailpieces to bottom of roof deck. Insulation shall
be ½” minimum thickness. Refer to section 15400 “Plumbing” for insulation products and
installation procedures.
INTEGRITY TESTING
A.
Test the integrity of all piping couplings and segments.
B.
Perform testing on the complete system or in sections.
C.
Perform testing prior to installation of insulation covering.
D.
Positive Pressure Testing
1.
Test piping with water.
2.
Test underground piping prior to backfilling. Hydrostatically test piping with water
and pump to a pressure of 10 feet of water column (4.3 psig) for one hour.
Piping shall hold pressure for 60 minutes. Pressure shall not drop by more than
10% during testing period.
3.
Test above ground piping from base of stack cleanout to roof drains.
4.
Verify that personnel are clear of drain test plugs for the duration of the testing.
Verify that test plugs in drains hold during testing.
5.
Fill piping system with water from base of stack cleanout to level with drain baffle
plate.
6.
Verify that baffle plates are level to each other in accordance with installation
tolerances. Identify if any drains too high relative to the rest and adjust level of
the drain body. Refer to installation procedures.
7.
The system shall maintain the water level for 60 minutes with no reduction in
water level.
8.
Verify flashing integrity. Identify any leaks in roof drain flashing from below.
9.
Identify and repair any leakage and repeat pressure test until satisfactory.
END OF SECTION
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