SECTION 15525 SUPPORTS, ANCHORS, SLEEVES, AND SEALING FOR HVAC SYSTEMS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 15525 SUPPORTS, ANCHORS, SLEEVES, AND SEALING FOR HVAC SYSTEMS


PART 1 - GENERAL

1.1 SUMMARY

A. This section includes specifications for supports of all HVAC equipment and materials as well as piping system anchors, sleeves, and sealing.

B. Roof Equipment Support Rails.

C. Note: Equipment curbs are specified in individual equipment specification sections.

1.2 REFERENCES

A. MSS SP-58 Pipe Hangers and Supports - Materials, Design, and Manufacture

B. MSS SP-59 Pipe Hangers and Supports - Selection and Application


PART 2 - PRODUCTS

2.1 STRUCTURAL SUPPORT

A. Provide all supporting steel required for the installation of mechanical equipment and materials, whether or not it is specifically indicated or sized, including angles, channels, beams, etc. to suspend or floor support mechanical equipment.

B. Provide support, anchors, and sleeves compatible with atmosphere where located. For applications located in corrosive atmospheres such as chemical rooms or rooms with high moisture, use Stainless Steel version of hanger model and type listed in this Section.  All other areas shall use Galvanized Steel.

2.2 PIPE HANGERS AND SUPPORTS

A. Description: MSS SP-58, Types 1 through 58, factory-fabricated components.  Refer to Part 3 "Hanger and Support Applications" Article for where to use specific hanger and support types.

B. Manufacturers: B Line, Fee and Mason, Grinnell, Kindorf, Michigan Hanger, Unistrut, or approved equal. Grinnell figure numbers are listed below; equivalent material by other manufacturers is acceptable.
1. Note:  All steel pipe supports shall have galvanized finish (Pregalvanized or hot dipped) or as called for in paragraph 2.1, B above.

2.3 TRAPEZE PIPE HANGERS

A. Description: MSS SP-69, Type 59, shop- or field-fabricated pipe-support assembly made from structural-steel shapes with MSS SP-58 hanger rods, nuts, saddles, and U- bolts.

2.4 METAL FRAMING SYSTEMS

A. Description:  MFMA-3, shop- or field-fabricated pipe-support assembly made of steel channels and other components.

B. Manufacturers:

1. B-Line Systems, Inc.; a division of Cooper Industries.

2. Unistrut Corp.; Tyco International, Ltd.

C. Coatings:  Galvanized finish.

2.5 THERMAL-HANGER SHIELD INSERTS

A. Description:   100-psig- minimum, compressive-strength insulation insert encased in sheet metal shield.

B. Manufacturers:

1. Carpenter & Paterson, Inc.

2. ERICO/Michigan Hanger Co.

3. PHS Industries, Inc.

4. Pipe Shields, Inc.

5. Rilco Manufacturing Company, Inc.

6. Value Engineered Products, Inc.

C. Insulation-Insert Material for Hot Piping.  Provide one of the following:

1. Water-repellent treated, ASTM C 533, Type I calcium silicate

2. Water-repellent treated, ASTM C 533, Type I calcium silicate or ASTM C 552, Type II cellular glass

3. ASTM C 552, Type II cellular glass.

D. For Trapeze or Clamped Systems:  Insert and shield shall cover entire circumference of pipe.

E. For Clevis or Band Hangers:  Insert and shield shall cover lower 180 degrees of pipe.

F. Insert Length:  Extend 2 inches beyond sheet metal shield for piping operating below ambient air temperature.

2.6 FASTENER SYSTEMS

A. Mechanical-Expansion Anchors: Insert-wedge-type stainless steel, for use in hardened portland cement concrete with pull-out, tension, and shear capacities appropriate for supported loads and building materials where used.

1. Manufacturers:
a. B-Line Systems, Inc.; a division of Cooper Industries.
b. Empire Industries, Inc.
c. Hilti, Inc.
d. ITW Ramset/Red Head.
e. MKT Fastening, LLC.
f. Powers Fasteners.

B. Floor Support for Pipe Sizes to 4 Inches

1. Insulated and Non Insulated Pipe: Cast iron adjustable pipe saddle, locknut nipple, floor flange, and Galvanized steel support.

2.7 STEEL HANGER RODS

A. Threaded both ends, threaded one end, or continuous threaded, stainless steel finish,

B. Size rods for individual hangers and trapeze support as indicated in the following schedule. Total weight of equipment, including valves, fittings, pipe, pipe content, and insulation, are not to exceed the limits indicated.

C. Maximum Load (lbs.)

Maximum Load (lbs.)
(650 deg F Maximum Temperature)
Road Diameter (inches)
610 3/8
1130 ½
1810 5/8
2710 ¾
3770 7/8
4960 1
8000 1-1/4


D. Provide rods complete with adjusting and lock nuts.

2.8 FLASHING

A. Metal Flashing:  per Section 07600 - Flashing and Sheet Metal.

B. Lead Flashing:   5 pounds per square foot sheet lead for waterproofing; 1 pound per square foot sheet lead for soundproofing.

C. Flexible Flashing:  47 mil thick sheet compatible with roofing.

D. Caps:  Steel, 22-gage minimum; 16 gage at fire resistant elements.

2.9 SLEEVES

A. Sleeves: The following materials are for wall, floor, slab, and roof penetrations:

1. Steel Sheet Metal: 24 gauge (0.70 mm) or heavier galvanized sheet metal, round tube closed with welded longitudinal joint.

2. Steel Pipe:  ASTM A53, Type E, Grade A, Schedule 40, galvanized, plain ends.

3. Cast Iron: Cast or fabricated wall pipe equivalent to ductile iron pressure pipe, having plain ends and integral water stop, except where other features are specified.

4. Wall Penetration Systems: Wall sleeve assembly, consisting of housing, gaskets, and pipe sleeve, with one mechanical joint end conforming to AWWA C111 and one plain pipe sleeve end.
a. Penetrating Pipe Deflection:  5 percent without leakage.
b. Housing: Ductile iron casting having waterstop and anchor ring, with ductile iron gland, steel studs and nuts, and rubber gasket conforming to AWWA C111, of housing and gasket size as required to fit penetrating pipe.
c. Pipe Sleeve:  AWWA C151, ductile iron pipe.
d. Housing to Sleeve Gasket: Rubber or neoprene push on type of manufacturer's design.

5. Cast Iron Sleeve Fittings: Commercially made sleeve having an integral clamping flange, with clamping ring, bolts, and nuts for membrane flashing.

6. Underdeck Clamp:  Clamping ring with set screws.

7. PVC Plastic: Manufactured, permanent, with nailing flange for attaching to wooden forms.

8. PVC Plastic Pipe:  ASTM D1785, Schedule 40.

9. PE Plastic: Manufactured, reusable, tapered, cup shaped, smooth outer surface, with nailing flange for attaching to wooden forms.

2.10 SEALING AND FIRESTOPPING

A. Non-Rated Penetrations

1. Pipe Penetrations Through Below Grade Walls: In exterior wall openings below grade, use a modular mechanical type seal consisting of interlocking synthetic rubber links shaped to continuously fill the annular space between the uninsulated pipe and the cored opening or a water stop type wall sleeve.

2. Pipe Penetrations: At pipe penetrations of non-rated interior partitions, floors and exterior walls above grade use urethane caulk in annular space between pipe insulation and sleeve.

3. Duct Penetrations:
a. Annular space between duct (with or without insulation) and the non-rated partition or floor opening shall not be larger than 2 inches. Where existing openings have an annular space larger than 2 inches, the space shall be patched to match existing construction to within 2 inches around the duct.
b. Where shown or specified, pack annular space with fiberglass batt insulation or mineral wool insulation. Provide 4-inch sheet metal escutcheon around duct on both sides of partition or floor to cover annular space.

2.11 EQUIPMENT SUPPORT STANDS

A. Description: Welded,  shop-  or  field-fabricated  equipment  support  made  from structural-steel shapes.

2.12 MISCELLANEOUS MATERIALS

A. Structural Steel:  ASTM A 36/A 36M, steel plates, shapes, and bars; galvanized.

2.13 EQUIPMENT SUPPORT ROOF RAILS

A. Acceptable Manufacturers: The Pate Company or equal.

B. Roof rail equipment supports: 18 ga galvanized steel, unitized  construction with integral base plate, continuous welded corner seams, pressure treated wood nailer, counter flashing with screws. Internally reinforced to conform with manufacture’s load bearing factors.

C. Provide with standard wood nailer with 1-inch overhang to allow for installation of insulation on vertical support surfaces.

D. Provide Roof Rails with Height dimension of 18” and length as required for equipment being supported.

PART 3 - EXECUTION

3.1 GENERAL

A. Provide all supporting devices as required for the installation of mechanical equipment and materials. All supports and installation procedures are to conform to the latest requirements of the ANSI Code for pressure piping.

B. Do not hang any mechanical item directly from a metal deck or run piping so it rests on the bottom chord of any truss or joist.

C. Support apparatus and material under all conditions of operation, variations in installed and operating weight of equipment and piping, to prevent excess stress, and allow for proper expansion and contraction.

D. Protect insulation at all hanger points.

E. Use Stainless Steel Hangers and Materials in lieu of Galvanized steel hangers in corrosive areas.

F. Allow sufficient space between adjacent pipes and ducts for insulation, valve operation, routine maintenance, etc.

3.2 HANGER AND SUPPORT APPLICATIONS

A. Comply with MSS SP-69 for pipe hanger selections and applications that are not specified in piping system Sections.

B. Use hangers and supports with galvanized, metallic coatings.

C. Use nonmetallic coatings on attachments for electrolytic protection where attachments are in direct contact with copper tubing.

D. Horizontal-Piping Hangers and Supports: Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Adjustable, Steel Clevis Hangers (MSS Type 1): For suspension of non- insulated or insulated stationary pipes, NPS 1/2 to NPS 30.

2. Yoke-Type Pipe Clamps (MSS Type 2): For suspension of 120 to 450 deg F pipes, NPS 4 to NPS 16, requiring up to 4 inches of insulation.

3. Carbon- or Alloy-Steel, Double-Bolt Pipe Clamps (MSS  Type 3):  For suspension of pipes, NPS 3/4 to NPS 24, requiring clamp flexibility and up to 4 inches of insulation.

4. Steel Pipe Clamps (MSS Type 4): For suspension of cold and hot pipes, NPS 1/2 to NPS 24, if little or no insulation is required.

5. Pipe Hangers (MSS Type 5): For suspension of pipes, NPS 1/2 to NPS 4, to allow off-center closure for hanger installation before pipe erection.

6. Adjustable Swivel Split- or Solid-Ring Hangers (MSS Type 6): For suspension of non-insulated stationary pipes, NPS 3/4 to NPS 8.

7. Adjustable, Steel Band Hangers (MSS Type 7): For suspension of non-insulated stationary pipes, NPS 1/2 to NPS 8.

8. Adjustable Band Hangers (MSS Type 9): For suspension of non-insulated stationary pipes, NPS 1/2 to NPS 8.

9. Adjustable Swivel-Ring Band Hangers (MSS Type 10): For suspension of non- insulated stationary pipes, NPS 1/2 to NPS 2.

10. Split  Pipe-Ring  with  or  without  Turnbuckle-Adjustment  Hangers  (MSS Type 11):  For suspension of non-insulated stationary pipes, NPS 3/8 to NPS 8.

11. Extension Hinged or 2-Bolt Split Pipe Clamps (MSS Type 12): For suspension of non-insulated stationary pipes, NPS 3/8 to NPS 3.

12. U-Bolts (MSS Type 24):  For support of heavy pipes, NPS 1/2 to NPS 30.

13. Clips (MSS Type 26): For support of insulated pipes not subject to expansion or contraction.

14. Pipe Saddle Supports (MSS Type 36): For support of pipes, NPS 4 to NPS 36, with steel pipe base stanchion support and cast-iron floor flange.

15. Pipe Stanchion Saddles (MSS Type 37): For support of pipes, NPS 4 to NPS 36, with steel pipe base stanchion support and cast-iron floor flange and with U-bolt to retain pipe.

16. Adjustable Pipe Saddle Supports (MSS Type 38): For stanchion-type support for pipes, NPS 2-1/2 to NPS 36, if vertical adjustment is required, with steel pipe base stanchion support and cast-iron floor flange.

17. Single Pipe Rolls (MSS Type 41): For suspension of pipes, NPS 1 to NPS 30, from 2 rods if longitudinal movement caused by expansion and contraction might occur.

18. Adjustable Roller Hangers (MSS Type 43): For suspension of pipes, NPS 2-1/2 to NPS 20, from single rod if horizontal movement caused by expansion and contraction might occur.

19. Complete Pipe Rolls (MSS Type 44): For support of pipes, NPS 2 to NPS 42, if longitudinal movement caused by expansion and contraction might occur but vertical adjustment is not necessary.

20. Pipe Roll and Plate Units (MSS Type 45): For support of pipes, NPS 2 to NPS 24, if small horizontal movement caused by expansion  and  contraction might occur and vertical adjustment is not necessary.

21. Adjustable Pipe Roll and Base Units (MSS Type 46): For support of pipes, NPS 2 to NPS 30, if vertical and lateral adjustment during installation might be required in addition to expansion and contraction.

E. Vertical-Piping Clamps:  Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Extension Pipe or Riser Clamps (MSS Type 8): For support of pipe risers, NPS 3/4 to NPS 20.

2. Carbon- or Alloy-Steel Riser Clamps (MSS Type 42): For support of pipe risers, NPS 3/4 to NPS 20, if longer ends are required for riser clamps.

F. Hanger-Rod Attachments:  Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Steel Turnbuckles (MSS Type 13): For adjustment up to 6 inches for heavy loads.

2. Steel Clevises (MSS Type 14): For 120 to 450 deg F piping installations.

3. Swivel Turnbuckles (MSS Type 15): For use with MSS Type 11, split pipe rings.

4. Malleable-Iron Sockets (MSS Type 16): For attaching hanger rods to various types of building attachments.

5. Steel Weldless Eye Nuts (MSS Type 17): For 120 to 450 deg F piping installations.

G. Building Attachments:   Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Steel or Malleable Concrete Inserts (MSS Type 18): For upper attachment to suspend pipe hangers from concrete ceiling.

2. Top-Beam C-Clamps (MSS Type 19): For use under roof installations with bar- joist construction to attach to top flange of structural shape.

3. Side-Beam or Channel Clamps (MSS Type 20): For attaching to bottom flange of beams, channels, or angles.

4. Center-Beam Clamps (MSS Type 21): For attaching to center of bottom flange of beams.

5. Welded Beam Attachments (MSS Type 22):  For attaching to bottom of beams if loads are considerable and rod sizes are large.

6. C-Clamps (MSS Type 23): For structural shapes.

7. Top-Beam Clamps (MSS Type 25):  For top of beams if hanger rod is required tangent to flange edge.

8. Side-Beam Clamps (MSS Type 27):  For bottom of steel I-beams.

9. Steel-Beam Clamps with Eye Nuts (MSS Type 28):  For attaching to bottom of steel I-beams for heavy loads.

10. Linked-Steel Clamps with Eye Nuts (MSS Type 29):  For attaching to bottom of steel I-beams for heavy loads, with link extensions.

11. Malleable Beam Clamps with Extension Pieces (MSS Type 30):  For attaching to structural steel.

12. Welded-Steel Brackets:  For support of pipes from below, or for suspending from above by using clip and rod. Use one of the following for indicated loads:
a. Light (MSS Type 31): 750 lb.
b. Medium (MSS Type 32): 1500 lb.
c. Heavy (MSS Type 33): 3000 lb.

13. Side-Beam Brackets (MSS Type 34):  For sides of steel or wooden beams.

14. Plate Lugs (MSS Type 57):  For attaching to steel beams if flexibility at beam is required.

15. Horizontal Travelers (MSS Type 58):  For supporting piping systems subject to linear horizontal movement where headroom is limited.

H. Saddles and Shields:   Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Steel Pipe-Covering Protection Saddles (MSS Type 39):   To fill interior voids with insulation that matches adjoining insulation.

2. Protection  Shields  (MSS  Type 40): Of  length  recommended  in  writing  by manufacturer to prevent crushing insulation.

3. Thermal-Hanger Shield Inserts:  For supporting insulated pipe.

I. Spring Hangers and Supports:  Unless otherwise indicated and except as specified in piping system Sections, install the following types:

1. Restraint-Control Devices (MSS Type 47):   Where indicated to control piping movement.

2. Spring Cushions (MSS Type 48): For light loads if vertical movement does not exceed 1-1/4 inches.

3. Spring-Cushion Roll Hangers (MSS Type 49): For equipping Type 41  roll hanger with springs.

4. Spring Sway Braces (MSS Type 50): To retard sway, shock,  vibration,  or thermal expansion in piping systems.

5. Variable-Spring Hangers (MSS Type 51): Preset to indicated load and limit variability factor to 25 percent to absorb expansion and contraction of piping system from hanger.

6. Variable-Spring Base Supports (MSS Type 52): Preset to indicated load and limit variability factor to 25 percent to absorb expansion and contraction of piping system from base support.

7. Variable-Spring Trapeze Hangers (MSS Type 53): Preset to indicated load and limit variability factor to 25 percent to absorb expansion and contraction of piping system from trapeze support.

8. Constant Supports: For critical piping stress and if necessary to avoid transfer of stress from one support to another support, critical terminal, or connected equipment. Include auxiliary stops for erection, hydrostatic test, and load- adjustment capability. These supports include the following types:
a. Horizontal (MSS Type 54): Mounted horizontally.
b. Vertical (MSS Type 55): Mounted vertically.
c. Trapeze  (MSS  Type 56): Two  vertical-type  supports  and  one  trapeze member.

9. Comply with MSS SP-69 for trapeze pipe hanger selections and applications that are not specified in piping system Sections.

10. Comply with MFMA-102 for metal framing system selections and applications that are not specified in piping system Sections.

11. Use mechanical-expansion anchors instead of building attachments where required in concrete construction.

3.3 HANGER AND SUPPORT INSTALLATION

A. Steel Pipe Hanger Installation: Comply with MSS SP-69 and MSS SP-89. Install hangers, supports, clamps, and attachments as required to properly support piping from building structure.

B. Trapeze Pipe Hanger Installation: Comply with MSS SP-69 and MSS SP-89. Arrange for grouping of parallel runs of horizontal piping and support together on field- fabricated trapeze pipe hangers.

1. Pipes of Various Sizes: Support together and space trapezes for smallest pipe size or install intermediate supports for smaller diameter pipes as specified above for individual pipe hangers.

2. Field fabricate from ASTM A 36/A 36M, steel shapes selected for loads being supported.  Weld steel according to AWS D1.1.

C. Fiberglass Pipe Hanger Installation: Comply with applicable portions of MSS SP-69 and MSS SP-89. Install hangers and attachments as required to properly support piping from building structure.

D. Each metal framing system in paragraph below requires calculation and detail.

E. Metal Framing System Installation: Arrange for grouping of parallel runs of piping and support together on field-assembled metal framing systems.

F. Each fiberglass strut system in first paragraph below requires calculation and detail.

G. Fiberglass Strut System Installation: Arrange for grouping of parallel runs of piping and support together on field-assembled fiberglass struts.

H. Thermal-Hanger Shield Installation: Install in pipe hanger or shield for insulated piping.

I. Fastener System Installation:

1. Install mechanical-expansion anchors in concrete after concrete is placed and completely cured. Install fasteners according to manufacturer's written instructions.

J. Install hangers and supports complete with necessary inserts, bolts, rods, nuts, washers, and other accessories.

K. Each equipment support in first paragraph below requires calculation and detail.

L. Equipment Support Installation:  Fabricate from welded-structural-steel shapes.

M. Install hangers and supports to allow controlled thermal movement of piping systems, to permit freedom of movement between pipe anchors, and to facilitate action of expansion joints, expansion loops, expansion bends, and similar units.

N. Install lateral bracing with pipe hangers and supports to prevent swaying.

O. Install building attachments within concrete slabs or attach to structural steel. Install additional attachments at concentrated loads, including valves, flanges, and strainers, NPS 2-1/2 and larger and at changes in direction of piping. Install concrete inserts before concrete is placed; fasten inserts to forms and install reinforcing bars through openings at top of inserts.

P. Load Distribution: Install hangers and supports so piping live and dead loads and stresses from movement will not be transmitted to connected equipment.

Q. Pipe Slopes: Install hangers and supports to provide indicated pipe slopes and so maximum  pipe  deflections  allowed  by  ASME B31.1  (for  power  piping)  and ASME B31.9 (for building services piping) are not exceeded.

R. Insulated Piping:  Comply with the following:

1. Attach clamps and spacers to piping.
a. Piping Operating above Ambient Air Temperature:   Clamp may project through insulation.
b. Piping Operating below Ambient Air Temperature:   Use thermal-hanger shield insert with clamp sized to match OD of insert.
c. Do not exceed pipe stress limits according to ASME B31.1 for power piping and ASME B31.9 for building services piping.

2. Install MSS SP-58, Type 39, protection saddles if insulation without vapor barrier is indicated. Fill interior voids with insulation that matches adjoining insulation.
a. Option:  Thermal-hanger shield inserts may be used.  Include steel weight- distribution plate for pipe NPS 4 and larger if pipe is installed on rollers.

3. High compressive-strength inserts may permit use of shorter shields or shields with lesser arc span. Edit first subparagraph and associated subparagraph below to suit Project.

4. Install MSS SP-58, Type 40, protective shields on cold piping with vapor barrier. Shields shall span an arc of 180 degrees.
a. Option:  Thermal-hanger shield inserts may be used.  Include steel weight- distribution plate for pipe NPS 4 and larger if pipe is installed on rollers.

5. Shield Dimensions for Pipe:  Not less than the following:
a. NPS 1/4 to NPS 3-1/2: 12 inches long and 0.048 inch thick.
b. NPS 4: 12 inches long and 0.06 inch thick.
c. NPS 5 and NPS 6: 18 inches long and 0.06 inch thick.
d. NPS 8 to NPS 14: 24 inches long and 0.075 inch thick.
e. NPS 16 to NPS 24: 24 inches long and 0.105 inch thick.

6. Pipes NPS 8 and Larger:  Include wood inserts.

7. Insert Material: Length at least as long as protective shield.

8. Thermal-Hanger Shields: Install with insulation same thickness as piping insulation.

3.4 GENERAL SUPPORT INSTALLATION

A. Install supports to provide for free expansion of the piping and duct system. Support all piping from the structure using concrete inserts, beam clamps, ceiling plates, wall

brackets,  or  floor  stands. Fasten ceiling plates and wall  brackets securely to  the structure and test to demonstrate the adequacy of the fastening.

B. Coordinate hanger and support installation to properly group piping of all trades.

C. Where piping can be conveniently grouped to allow the use of trapeze type supports, use standard structural shapes or continuous insert channels for the supporting steel. Where continuous insert channels are used, pipe supporting devices made specifically for use with the channels may be substituted for the specified supporting devices provided that similar types are used and all data is submitted for prior approval.

D. Perform all welding in accordance with standards of the American Welding Society. Clean surfaces of loose scale, rust, paint, or other foreign matter and properly align before welding. Use wire brush on welds after welding. Welds shall show uniform section, smoothness of weld metal and freedom from porosity and clinkers. Where necessary to achieve smooth connections, joints shall be dressed smooth.

3.5 HANGER AND SUPPORT SPACING

A. Place a hanger within 12 inches of each horizontal elbow valve, strainer, or similar piping specialty item.

B. Where several pipes can be installed in parallel and at the same elevation, provide multiple or trapeze hangers.

C. Support riser piping independently of connected horizontal piping.

D. Adjust hangers to obtain the slope specified in the piping section of this specification.


E. Space hangers for pipe as follows:


Pipe Material

Pipe Size
Maximum Spacing
Steel 1/2" through 1-1/4" 6'-6"
Steel 1-1/2" through 6" 10'-0"
Steel 8" through 12" 14'-0"
Steel 14" and over 20'-0"


3.6 VERTICAL RISER CLAMPS

A. Support vertical piping with clamps secured to the piping and testing on the building structure at each floor.

B. Piping 5 inches and above, of lengths exceeding 30 feet, shall be additionally supported on base elbows secured to the building structure, with flexible supporting hangers provided at top of riser to allow for pipe expansion.

3.7 EQUIPMENT SUPPORTS

A. Fabricate structural-steel stands to suspend equipment from structure overhead or to support equipment above floor.

B. Grouting:  Place grout under supports for equipment and make smooth bearing surface.

C. Provide lateral bracing, to prevent swaying, for equipment supports.

3.8 METAL FABRICATIONS

A. Cut,  drill,  and  fit  miscellaneous  metal  fabrications  for  trapeze  pipe  hangers  and equipment supports.

B. Fit exposed connections together to form hairline joints.  Field weld connections that cannot be shop welded because of shipping size limitations.

C. Field Welding: Comply with AWS D1.1 procedures for shielded metal arc welding, appearance and quality of welds, and methods used in correcting welding work, and with the following:

1. Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.

2. Obtain fusion without undercut or overlap.

3. Remove welding flux immediately.

4. Finish welds at exposed connections so no roughness shows after finishing and contours of welded surfaces match adjacent contours.

3.9 ADJUSTING

A. Hanger Adjustments:  Adjust hangers to distribute loads equally on attachments and to achieve indicated slope of pipe.

B. Trim excess length of continuous-thread hanger and support rods to 1-1/2 inches.

3.10 PAINTING

A. Galvanized Surfaces:  Clean welds, bolted connections, and abraded areas and apply galvanizing-repair paint to comply with ASTM A 780.

3.11 FLASHING

A. Provide  a  flexible  flashing  and  metal  counterflashing  where  piping  and  ductwork penetrate weather or waterproofed walls, floors, and roofs.

B. Provide acoustical lead flashing around ducts and pipes penetrating equipment rooms, installed in accordance with manufacturer's instructions for sound control.

3.12 SLEEVES

A. Install sleeves for pipes passing through concrete and masonry walls, concrete floor and roof slabs, and where indicated. Grout space between sleeve and structure.

B. Install sleeves for pipes passing through concrete and masonry walls, gypsum board partitions, concrete floor and roof slabs, and where indicated.

1. Cut sleeves to length for mounting flush with both surfaces.
a. Exception: Extend sleeves installed in floors of mechanical equipment areas or other wet areas 2 inches (50 mm) above finished floor level. Extend cast iron sleeve fittings below floor slab as required to secure clamping ring where specified.

2. Build sleeves into new walls and slabs as work progresses.

3. Install large enough sleeves to provide 1/4-inch (6 mm) annular clear space between sleeve and pipe or pipe insulation.  Use the following sleeve materials:
a. PVC Pipe Sleeves: For pipes smaller than 6 inches (150 mm).
b. Steel Pipe Sleeves: For pipes smaller than 6 inches (150 mm).
c. Steel Sheet Metal Sleeves: For pipes 6 inches (150 mm) and larger that penetrate gypsum board partitions.
d. Cast Iron Sleeve Fittings: For floors having membrane waterproofing. Secure flashing between clamping flanges. Install section of cast iron soil pipe to extend sleeve to 2 inches (50 mm) above finished floor level. Flashing is specified in Division 7 Section "Flashing and Sheet Metal".
1) Seal space outside of sleeve fittings with non-shrink, non-metallic grout.

4. Except for below grade wall penetrations, seal annular space between sleeve and pipe or pipe insulation, using elastomeric joint sealants.

C. Above Grade, Exterior Wall, and Pipe Penetrations: Seal penetrations using sleeves and mechanical sleeve seals. Size sleeve for 1-inch (25 mm) annular clear space between pipe and sleeve for installation of mechanical seals.

1. Install steel pipe for sleeves smaller than 6 inches (150 mm).

2. Install cast iron wall pipes for sleeves 6 inches (150 mm) and larger.

3. Assemble  and  install  mechanical  seals  according  to  manufacturer's  printed instructions.

D. Below Grade, Exterior Wall, Pipe Penetrations: Install cast iron wall pipes for sleeves. Seal pipe penetrations using mechanical sleeve seals. Size sleeve for 1-inch (25 mm) annular clear space between pipe and sleeve for installation of mechanical seals.

E. Below Grade, Exterior Wall, Pipe Penetrations: Install ductile iron wall penetration system sleeves according to manufacturer's printed installation instructions.

F. Duct Sleeves

1. Duct sleeves are not required in non-rated partitions or floors.

2. Provide sleeve required for fire dampers in fire rate partitions and floors. Reference fire damper details on drawings.

3.13 SEALING

A. Non-Rated Partitions:

1. In exterior wall openings below grade, assemble rubber links of mechanical seal to the proper size for the pipe and tighten in place, in accordance with manufacturer's instructions.

2. At all interior partitions and exterior walls, pipe penetrations are required to be sealed. Apply sealant to both sides of the penetrations in such a manner that the annular space between the pipe sleeve or cored opening and the pipe or insulation is completely blocked.

3. Duct penetrations through non rated partitions shall require sheet metal escutcheons with fiberglass or mineral wool insulation fill for spaces that include laboratories, clean rooms, animal rooms, kitchens, cart wash rooms, janitor closets, cart wash rooms, toilet rooms, mechanical rooms, conference rooms, private consultation rooms, and where noted on drawings elsewhere.

3.14 ROOF RAIL SUPPORTS

A. Coordinate installation of roof rail supports with roofing work of this project.

B. Coordinate roofing insulation installation with work of this project.  Support frame to be insulated vertically up all sides.

END OF SECTION