Section 15097 SEISMIC RESTRAINTS FOR PIPING

Section 15097

SEISMIC RESTRAINTS FOR PIPING

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. This Section specifies seismic restraints for bracing all piping systems specified in Section

15050. This Section does not include seismic restraints for fire sprinkler systems. B. Definitions

1. Longitudinal direction - direction parallel to the pipe axis.

2. Lateral direction - direction perpendicular to the pipe axis. C. Operating Conditions

1. The seismic restraints specified in this Section are provided to resist pipe movements and loads occurring as a result of an earthquake or other seismic event.

2. Unless otherwise specified, all piping shall have bracing to resist seismic loading caused by forces applied at the individual pipe's center of gravity. Seismic loading shall be 1.0 g acting in the lateral and longitudinal directions and 0.5 g acting simultaneously in the vertical directions.

D. Restraint Selection

1. Unless otherwise specified, the Contractor shall select, locate and provide seismic restraints for piping in accordance with the Contract Documents.

2. The Contractor shall review the piping layout in relation to the surrounding structure and adjacent piping and equipment before selecting the restraint to be used at each point.

3. Seismic restraints may be omitted from the following installations:

a. Gas piping less than 1-inch inside diameter.

b. Piping in boiler and mechanical rooms less than 1 1/4-inch inside diameter. c. All other piping less than 2 1/2-inch inside diameter.

d. All piping suspended by individual hangers 12 inches or less in length from the top of the pipe to the bottom of the support for the hanger.

4. Piping systems shall not be braced to dissimilar parts of a building or to dissimilar building systems that may respond in a different mode during an earthquake. Examples: wall and a roof; solid concrete wall and a metal deck with lightweight concrete fill.

5. Restraints shall be sized to fit the outside diameter of the pipe, tubing, or, where specified, the outside diameter of insulation.

6. There shall be no contact between a pipe and restraint component of dissimilar metals. The contractor shall prevent contact between dissimilar metals when restraining copper tubing by the use of copper-plated, rubber, plastic or vinyl coated, or stainless steel restraint components.

7. Branch lines shall not be used to brace main lines.

8. Seismic bracing shall not limit the expansion and contraction of the piping system.

1.2 QUALITY ASSURANCE

A. References: This Section contains references to the following documents. They are a part of this Section as specified and modified. In case of a conflict between the requirements of this Section and those of the listed documents, the requirements of this Section shall prevail.

ANSI A58.1 Minimum Design Loads for Buildings and Other

Structures

AISC Manual of Steel Construction American Institute of Steel Construction, Manual of Steel Construction, Allowable Stress Design -

9th Edition

FEDSPEC WW-H-171e-78 Hangers and Supports, Pipe

MFMA-1-84 Metal Framing Standards Publication

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

MSS SP-69 Pipe Hangers and Supports - Selection and

Application

SMACNA, PPIC Guidelines for Seismic Restraints of Joint Publication Mechanical Systems and Plumbing Piping Systems

B. Approval: Seismic restraint load calculations specified in Paragraph 15097-3.1 shall be reviewed and signed by a structural engineer registered in the State of California.

PART 2 - PRODUCTS

2.1 ACCEPTABLE PRODUCTS

A. Standard pipe restraints and components shall be manufactured by Carpenter & Patterson, B-Line, Kin-Line, Anvil, Michigan, Pipe Shields Incorporated, Superstrut, Unistrut, or equal. Pipe restraint materials shall conform to the requirements of MSS SP-58 and MFMA-1.

2.2 MATERIALS

A. Unless otherwise specified, restraints, including braces, pipe and structural attachments, shall be hot-dip galvanized after fabrication. Nuts, bolts and washers, fittings and accessories, may be mechanically zinc-coated except for those subject to moisture or corrosive atmosphere, which shall be type 304 stainless steel.

B. Pipe Attachments

1. Type 1s: Clevis Restraint Attachment - Clevis attachment shall be Type 1, clevis pipe hanger, as specified in Paragraph 15096-2.2 B.

2. Type 3s: Double Bolt Restraint Clamp - Restraint clamp shall be Type 3, double bolt pipe clamp, as specified in Paragraph 15096-2.2 B.

3. Type 4s: Roller Restraint Attachment - Roller attachment shall be Type 4, adjustable roller hanger, as specified in Paragraph 15096-2.2 B. Hold down strap shall be carbon steel and sized as follows: pipe size 1 inch through 2 inch shall be

1 inch by 1/8 inch thick, pipe sizes 2 1/2-inch through 4 inch shall be 1 1/4-inch by

3/l6 inch thick, 6 inch pipe shall be 2 inch by 3/l6 inch thick, 8 inch pipe shall be

2 1/2-inch by 3/16 inch thick, 10-inch through 16-inch pipe shall be 2 1/2-inch by

1/4 inch thick, 20-inch pipe shall be 3 inch by 1/4 inch thick, and 24-inch pipe shall be 3 inch by 3/8 inch thick.

4. Type 7s: U-Bolt Restraint - U-bolt restraint shall be Type 7, U-bolt, as specified in

Paragraph 15096-2.2 B.

5. Type 13s: Framing Channel Strap Restraint - Strap restraint shall be Type 13, framing channel pipe strap, as specified in Paragraph 15096-2.2 B.

6. Type 14s: Pipe Clamp Restraint - Pipe clamp shall be carbon steel, with configuration and components equivalent to MSS and FEDSPEC Type 4. Rod attachment and longitudinal brace connection stud shall be carbon steel, fabricated and welded by the manufacturer.

a. Steel pipe (insulated) shall be Superstrut No. S-720, Kin-Line No. S475, or equal, with insulation shield.

b. Steel pipe (uninsulated) shall be Superstrut No. S-720, Kin-Line No. S475, or equal.

c. Cast and ductile iron pipe shall be Superstrut No. S-720, Kin-Line No. S475, or equal.

d. Copper pipe (insulated) shall be Superstrut No. S-720, Kin-Line No. S475, or equal, with insulation shield.

e. Copper pipe (uninsulated) shall be Superstrut No. S-720, Kin-Line No.

S475, or equal, with insulation shield or dielectric lining.

f. Plastic pipe shall be Superstrut No. S-720, Kin-Line No. S475, or equal. C. Trapeze Restraints

1. Unless otherwise specified, trapeze members shall have a minimum steel thickness of 12 gage, with a maximum deflection 1/240 of the span.

2. Type 20s: Single Channel Lateral Restraint - Trapeze restraint cross member shall be 1 5/8-inch square carbon steel framing channel, Unistrut P1000, B-Line B22, Superstrut A-1200, or equal. Pipe attachments shall be Type 13s or Type 7s specified in Paragraph 15097-2.2 B. Rod stiffeners and lateral brace shall be as specified in Paragraph 15097-2.2 D.

3. Type 21s: Double Channel Lateral Restraint - Trapeze restraint cross member shall be a double channel manufactured assembly such as Unistrut P1001, B-Line B22A, Superstrut A-1202, or equal. Pipe attachments shall be Type 13s or Type 7s specified in Paragraph 15097-2.2 B. Rod stiffeners and lateral brace shall be as specified in Paragraph 15097-2.2 D.

4. Type 22s: Double Channel Longitudinal Restraint - Trapeze restraint cross member shall be a double channel manufactured assembly such as Unistrut P1001, B-Line B22A, Superstrut A-1202, or equal. Pipe attachments shall be Type 13s or Type 7s specified in Paragraph 15097-2.2 B. Rod stiffeners, longitudinal and lateral braces shall be as specified in Paragraph 15097-2.2 D.

D. Braces and Fittings

1. Seismic Brace Fitting: Seismic brace fitting shall be manufactured for use with industry standard framing channel. The fitting shall be carbon steel, welded construction, two-piece linked fitting. A means to reduce noise and vibration transmission between the linked fitting parts shall be provided. Seismic brace fittings shall be Superstrut C-749N series seismic brace, Kin-Line No. 633 seismic connector fitting, or equal.

2. Hanger Rod Stiffener Assembly: Rod stiffener channel shall be 1 5/8-inch square carbon steel framing channel, Unistrut P1000, B-Line B22, Superstrut A-1200, or equal. Rod stiffener clamps shall be complete with channel nut and shall be Superstrut ES-142, Kin-Line No. 635, or equal.

3. Type A1 Seismic Brace: Seismic brace shall be 1 5/8-inch square carbon steel framing channel, Unistrut P1000, B-Line B22, Superstrut A-1200, Kin-Line No. 4112, or equal.

4. Type A2 Seismic Brace: Seismic brace shall be 1 5/8-inch wide by 3 1/4-inch deep carbon steel framing channel, Unistrut P5000, B-Line B11, Superstrut H-1200, Kin- Line No. 8212, or equal.

E. Structural Attachments

1. Unless otherwise specified, hanger rod structural attachments shall be as specified in Section 15096. Structural attachments for longitudinal and lateral seismic braces shall be as specified in Paragraph 15097-2.2 E.

2. Type SA-1 Attachment: Brace fitting shall be as specified in Paragraph 15097-

2.2 D. Concrete anchors shall be as specified in Section 05500 with embedment and location dimensions as specified.

3. Type SA-2 Attachment: Brace fitting shall be as specified in Paragraph 15097-

2.2 D. Concrete anchors shall be as specified in Section 05500 with embedment and location dimensions as specified. Framing channel shall be as specified in Paragraph 15097-2.2 F.

4. Type SA-3 Attachment: Brace fitting shall be as specified in Paragraph 15097-

2.2 D. Cap screw, lockwasher and hex nut materials and finish shall be compatible with structural steel material.

5. Type SA-4 Attachment: Brace fitting shall be as specified in Paragraph 15097-

2.02 D.

6. Type SA-5 Attachment: Brace fitting shall be as specified in Paragraph 15097-

2.02 D. Four-inch x 3-inch x 3/8-inch angle shall be carbon steel. F. Accessories

1. Hanger Rods: Rods shall be carbon steel, threaded on both ends or continuous threaded and sized as specified.

2. Framing Channel: Framing channel shall conform to the Metal Framing

Manufacturers Association standard MFMA-1. Framing channel shall be roll formed,

12-gage carbon steel. Channel shall have a continuous slot along one side with in- turned clamping ridges. Channel shall be Unistrut P1000 series, B-Line B22 series, Superstrut A-1200 series, or equal.

3. Rod Coupling: Rod coupling shall be carbon steel, with sight hole in center of coupling body, Anvil Fig. 135, Superstrut H-119, or equal.

2.3 THERMAL PIPE HANGER SHIELD

A. Thermal shields shall be provided at seismic restraint locations on pipe requiring insulation.

Thermal pipe hanger shields shall be as specified in Paragraph 15096-2.3. Stainless steel band clamps shall be provided on thermal shields at longitudinal pipe restraint locations.

2.4 PRODUCT DATA

A. The following information shall be provided as specified in Section 01300:

1. Seismic restraint locations and legend as specified in Paragraph 15097-3.1.

2. Load calculations as specified in Paragraph 15097-1.2 B.

PART 3 - EXECUTION

3.1 PIPE RESTRAINT LOCATIONS

A. The first seismic restraint on a piping system shall be located not more than 10 feet from the main riser, entrance to a building or piece of equipment.

B. Cast iron pipe shall be braced on each side of a change in direction of 90 degrees or more.

Joints in risers shall be braced or stabilized between floors.

C. No-hub and bell and spigot cast iron soil pipe shall be braced longitudinally every 20 feet and laterally every 10 feet.

D. Lateral bracing for one pipe section may also act as longitudinal bracing for the pipe section connected perpendicular to it, if the bracing is installed within 24 inches of the elbow or tee of the same size.

E. Seismic restraint locations and components shall be indicated on the piping layout shop drawings. The Contractor shall provide a legend giving load information and restraint component selection at each restraint location.

3.2 INSTALLATION

A. Rod stiffener assemblies shall be used at seismic restraints for hanger rods over 6 inches in length. A minimum of two rod stiffener clamps shall be used on any rod stiffener assembly.

B. Lateral and longitudinal bracing shall be installed between 45 degrees above and 45 degrees below horizontal, inclusive, relative to the horizontal centerline of the pipe.

C. Welded and bolted attachments to the building structural steel shall be in accordance with the requirements of the AISC Manual of Steel Construction. There shall be no drilling or burning of holes in the building structural steel without approval of the Resident Project Representative.

D. Embedded anchor bolts shall be used instead of concrete inserts for seismic brace installations in areas below water surface or normally subject to submerging.

E. The Contractor shall install thermal pipe hanger shields on insulated piping at required locations during restraint installation. Butt joint connections to pipe insulation shall be made at the time of insulation installation in accordance with the manufacturer's recommendations.

F. Restraint components in contact with plastic pipe shall be free of burrs and sharp edges. G. Rollers shall roll freely without binding.

H. Plastic or rubber end caps shall be provided at the exposed ends of all framing channels that are located up to 7 feet above the floor.

END OF SECTION