Chrysler LLC - ME Building Group Construction Standards

Project & Bid Package Reviewed : Oct. 2010

SECTION 15420 - SIPHONIC ROOF DRAINAGE

PART 1 - GENERAL

1.1  RELATED DOCUMENTS

A.  Drawings and general provisions of the Contract, including General Conditions, exhibits and Division 1 specification sections, apply to this section.

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:

  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.

C.  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.

1.3  RELATED SECTIONS

A.  Division 02 “Site Construction,”

1.4  REFERENCES

A.  American Iron and Steel Institute (AISI)

B.  American National Standards Institute (ANSI)

  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).”

C.  American Society of Civil Engineers (ASCE)

1.  ASCE 7 “Minimum Design Loads for Buildings and Other Structures.”

D.  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,”

E.  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,”

F.  Steel Deck Institute (SDI)

  1. Design Manual for Composite Decks, Form Decks and Roof Decks,
  2. Manual of Construction with Steel Deck,
  3. Standard Practice Details.

G.  Underwriters Laboratory

  1. UL Fire Resistance Directory

1.5  SYSTEM DESCRIPTION

A.  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.

B.  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”.

1.6  SUBMITTALS

A.  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.

B.  Submit Product Data

  1. Product data submittal shall include all components including, but not limited to:
  2. Siphonic roof drains,
  3. Drain installation procedures,
  4. Pipe and fittings,
  5. Couplings, joint methods, gaskets,
  6. Hangers and supports,
  7. Supplemental steel,
  8. Closeout Submittals
  9. Actual as-built drawings,
  10. Operation and Maintenance Manuals,
  11. Pipe integrity test reports,
  12. Siphonic drain manufacturer flashing warrantee,
  13. Final inspection reports.

C.  Submit Shop Drawings

  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.

D.  Submit Maintenance Data

  1. Submit maintenance instructions for inclusion in Operating and Maintenance Manuals.

1.7  QUALITY ASSURANCE

A.  A plumbing contractor duly licensed with local and/or state authorities shall install the siphonic roof drainage system.

1.8  DELIVERY, STORAGE AND HANDLING

A.  Hardware

  1. Retain shipping flange protective covers and protective coatings during storage.
  2. Protect components against damage.
  3. 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

  1. Jay R. Smith Manufacturing Co., Inc.
  2. No substitutions. Design is based on product-specific data.

C.  Pipe and Fittings, Cast Iron

  1. Charlotte Pipe and Foundry Company,
  2. Tyler Pipe,
  3. Approved equal.

D.  Pipe and Fittings, PVC

  1. Charlotte Pipe and Foundry Company,
  2. Approved equal.

E.  Couplings, Siphonic, Pipe Class A888

  1. Husky,
  2. Clamp-All,
  3. Tyler,
  4. Mission,
  5. Approved equal.

F.  Hangers

  1. B-Line,
  2. Carpenter – Patterson,
  3. Tolco,
  4. Approved equal.

2.2  SIPHONIC ROOF DRAINS (RD-1)

A.  Equal to Jay R. Smith Model No. 1005T (Series).

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: ASTM A 48 gray iron casting with fastening ring and integral anti-vortex vanes,

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.

2.3  PIPE, FITTINGS AND COUPLINGS

PIPE CLASS A888
/
ITEM / SPECIFICATION /
Pipe / Material / Cast Iron.
Pipe Standard / ASTM A888 (CISPI 301), ASTM A74.
Wall Thickness / Service weight.
Product Marking / As described in ASTM A888.
Fittings / Material / Cast Iron.
Standard / ASTM A888 (CISPI 301)
Wall Thickness / Same as pipe.
End Connections / No-hub.
Joint / Description / 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.
Flange / 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.
Reducers / ASTM A888. Concentric.
Adaptors / ASTM A888 (CISPI 301) tapped adapter, Table 65.
Steel x Cast Iron Mission adaptor coupling.
PIPE CLASS D2665
/
ITEM / SPECIFICATION /
Pipe / Material / Polyvinylchloride (PVC).
Pipe Standard / 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.
Fittings / 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.
Joint / Description / Solvent cemented socket joint.
Assembly / Per ASTM D2665 and D2885.
Flange / 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.
Reducers / ASTM D3311. Reducer or bushing.
Adaptors / PVC. Threaded adaptor. FNPT to socket joint.
Steel x PVC Mission adaptor coupling.

2.4  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.

3.2  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:

  1. 4” and smaller: ±4 inches
  2. 5” and larger: ±8 inches

F.  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.

J.  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.

3.3  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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