[SUBMITTAL INFORMATION]

DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

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SECTION 230548

VIBRATION AND SEISMIC CONTROLS FOR HVAC AND PIPING AND EQUIPMENT

(Edited from DeCA June 2017 Design Criteria)

****See 1BC para. 1621 and ASCE 7.02, para 9.6 for applicability of this section and for exceptions based on seismic design category and importance factor. The structural engineer shall determine these values. Include, delete or edit this section as appropriate***

PART 1 - GENERAL

1.1  SUMMARY

  1. Section Includes:
  2. Seismic restraint for piping, conduit, ductwork and equipment.
  3. Seismic restraints for non-isolated equipment.
  4. Certification of seismic restraint designs and installation supervision.

4.  Certification of seismic attachment of housekeeping pads.

5.  All mechanical and equipment shall have seismic restraints. Equipment buried underground is excluded but entry of services through the foundation wall is included. Equipment referred to below is typical. (Equipment not listed is still included in this Specification).

Air Conditioning Units / Fans (All types) / Tanks (All types) / Compressor racks
Air Handling Units / Comp. Room Units / Heat Exchangers / Unit Heaters
Condensers / Condensing Units / Var. Freq. Drives / Piping
Water Heaters / Cooling Towers / Pumps (All types) / Ductwork
Rooftop Units / Boilers / Water Chillers / Kitchen Hoods
  1. Equipment shall be constructed internally to withstand seismic forces specified hereunder.
  2. Related Sections:
  3. Division 01 Section Mechanical, Refrigeration, Food Service Equipment and Electrical Coordination.
  4. Division 01 Section Quality Control.
  5. Division 01 Section Closeout Procedures.
  6. Division 03 Section Cast-in-Place Concrete.
  7. Division 23 Section Hangers and Supports for HVAC Piping and Equipment.
  8. Division 26 Section Vibration and Seismic Controls for Electrical Systems.
  9. Division 26 Electrical.

1.2  INTENT

****See 1BC para. 1621 and ASCE 7.02, para 9.6 for exceptions based on seismic design category and importance factor. The structural engineer shall determine these values. Include, delete or edit this section as appropriate***

  1. It is the intent of the seismic portion of this Specification to keep all mechanical and electrical building system components in place during a seismic or wind event required by the criteria stated on the Structural Drawings.
  2. All such systems must be installed in strict accordance with seismic codes, component manufacturer's and building construction standards. Whenever a conflict occurs between the manufacturer's or construction standards, the most stringent shall apply.
  3. This Specification is considered to be minimum requirements for seismic consideration and is not intended as a substitute for legislated, more stringent, national, state or local construction requirements.
  4. Any variance or non-compliance with these specification requirements shall be corrected by the Contractor in an approved manner.
  5. Seismic restraints shall be designed in accordance with IBC 2012, Chapter 16 and ASCE-7.

1.3  REGULATORY REQUIREMENTS

  1. IBC: International Building Code.
  2. ASCE: American Society of Civil Engineers.
  3. NFPA: National Fire Protection Association.
  4. SMACNA: Sheet Metal Air Conditioners Contractor National Association.

***Edit California Requirement***

  1. OSHPD: Office of Statewide Health Planning and Development for the State of California.

1.4  PERFORMANCE REQUIREMENTS

  1. Vibration Isolators:
  2. Provide vibration isolation on motor driven equipment over 0.5 HP (0.35 kW) unless internal isolation is specified.
  3. Provide minimum static deflection of isolators for equipment as scheduled on the Contract Drawings.
  4. Seismic Restraints:
  5. Provide seismic restraint for all equipment not listed in exclusions (3.2 below) and on connected piping, conduit and ductwork.
  6. All seismic restraints shall be designed to be adequate to keep mechanical and electrical building components in place during a seismic or wind event described in Division 01 Section Summary of Work.
  7. All floor and roof mounted equipment whether isolated or not shall be anchored, bolted or welded to the structure. Bolt locations, diameter of inserts, embedment depth and weld length as shown on the approved submittal Drawings shall be installed as approved.
  8. All suspended equipment shall be two or four point independently braced with engineered cable restraints, installed taut for non-isolated equipment. A minimum of four (4) cables must be used. Support rod compressive stresses resulting from seismic accelerations shall be included in the calculations and addressed accordingly. Non-isolated equipment may be restrained with rigid bracing to structure using engineered cable.
  9. All such systems must be installed in strict accordance with seismic codes, component manufacturers and building construction standards.
  10. This Specification is to be considered a minimum requirement for seismic consideration. Applicable codes shall govern.
  11. Wind-Restraint Loading:
  12. Basic Wind Speed: Reference Structural documents.
  13. Building Classification Category: Reference Structural documents.

1.5  SUBMITTALS

  1. Submit under provisions of Division 01 Section Quality Control.
  2. Shop Drawings: Indicate and locate vibration isolators, with static and dynamic load on each. Indicate and locate seismic restraints, with load on each.
  3. Product Data: Provide schedule of vibration isolator and seismic restraint type with location and load on each. Provide manufacturer’s product data for each isolator and restraint.
  4. Manufacturer's Installation Instructions: Indicate special procedures and setting dimensions.
  5. Manufacturer's Certificate: Certify that seismic restraints have been selected and designed by a licensed professional engineer, licensed to practice in the state where the restraints are being installed, to meet or exceed specified requirements.
  6. Where walls, floors, slabs or supplementary steel work are used for seismic restraint locations, details of acceptable attachment methods for ducts, conduit and pipe must be included and approved before the condition is accepted for installation. Restraint manufacturers' submittals must include spacing, static loads and seismic loads at all attachment and support points.
  7. Seismic restraint calculations must be provided for all connections of equipment to the structure. Calculations must be stamped by a registered professional engineer with at least five years of seismic design experience, licensed in the state of the job location.

Retain paragraph below if procedures for welder certification are retained in "Quality Assurance" Article.

  1. Welding certificates.

PART 2 - PRODUCTS

2.1  HOUSEKEEPING PADS

A.  Housekeeping pad reinforcement and monolithic pad attachment to the structure details and design shall be prepared by the restraint vendor if not already indicated on the Drawings.

  1. Housekeeping pads shall be coordinated with restraint vendor and sized to provide a minimum edge distance of ten (10) bolt diameters all around the outermost anchor bolt to allow development of full drill-in wedge anchor ratings. If cast-in anchors are to be used, the housekeeping pads shall be sized to accommodate the ACI requirements for bolt coverage and embedment.
  2. Housekeeping pad anchors shall consist of a ductile iron casting that is tapered and hexagonal, smaller at its base than at its top. The upper portion shall have holes for rebar to pass through. The anchor shall be continuously threaded from top to bottom for the attachment of soleplates. Housekeeping pad anchors shall be attached to the structural slab using a stud wedge anchor. Housekeeping pad anchors shall be type HPA and stud wedge anchor shall be equal to type SAS both as manufactured by Mason Industries, Inc or equivalent.

2.2  SUPPLEMENTARY SUPPORT STEEL

A.  Contractor shall supply supplementary support steel for all equipment, piping, ductwork, etc. including roof mounted equipment, as required or specified. When supplementary support steel structure is welded, the Contractor shall qualify procedures and personnel according to AWSD1.1/D1.1M, "Structural Welding Code - Steel".

2.3  ATTACHMENTS

A.  Contractor shall supply restraint attachment plates cast into housekeeping pads, concrete inserts, double sided beam clamps, etc. in accordance with the requirements of the restraint vendor's calculations.

****Edit California Requirements for projects not in California****

2.4  SEISMIC RESTRAINTS

***Edit California Requirement***

A.  Seismic Cable Restraints shall consist of galvanized steel aircraft cables sized to resist seismic loads with a minimum safety factor of two and arranged to provide alldirectional restraint. Cables must be pre-stretched to achieve a certified minimum modulus of elasticity. Cable end connections shall be steel assemblies that swivel to final installation angle and utilize two clamping bolts to provide proper cable engagement. Cables must not be allowed to bend across sharp edges. [Cable assemblies shall have an Anchorage Preapproval "R" Number from OSHPD in the State of California verifying the maximum certified load ratings]. Cable assemblies shall be Type SCB at the ceiling and at the clevis bolt, SCBH between the hanger rod nut and the clevis or SCBV if clamped to a beam all as manufactured by Mason Industries, Inc or equivalent.

  1. Seismic solid braces shall consist of steel angles or channels to resist seismic loads with a minimum safety factor of 2 and arranged to provide all directional restraint. Seismic solid brace end connectors shall be steel assemblies that swivel to the final installation angle and utilize two through bolts to provide proper attachment. [Seismic solid brace assembly shall have anchorage preapproval "R" number from OSHPD in the state of California verifying the maximum certified load ratings]. Solid seismic brace assemblies shall be equal to type SSB as manufactured by Mason Industries, Inc., or equivalent.

C.  Steel angles, sized to prevent buckling, shall be clamped to pipe or equipment rods utilizing a minimum of three ductile iron clamps at each restraint location when required. Welding of support rods is not acceptable. [Rod clamp assemblies shall have an Anchorage Preapproval "R" Number from OSHPD in the State of California]. Rod clamp assemblies shall be equal to type SRC as manufactured by Mason Industries, Inc., or equivalent.

Note: Paragraphs a-c apply to trapeze as well as clevis hanger locations. At trapeze anchor locations piping must be shackled to the trapeze. Specifications apply to hanging equipment as well.

D.  Pipe clevis cross bolt braces are required in all restraint locations. They shall be special purpose preformed channels deep enough to be held in place by bolts passing over the cross bolt. [Clevis cross braces shall have an Anchorage Preapproval "R" Number from OSHPD in the State of California]. Clevis cross brace shall be equal to type CCB as manufactured by Mason Industries, Inc., or equivalent.

  1. All-directional seismic snubbers shall consist of interlocking steel members restrained by a one-piece molded neoprene bushing of bridge bearing neoprene. Bushing shall be replaceable and a minimum of 1/4 inch thick. Rated loadings shall not exceed 1000 psi. A minimum air gap of 1/8 inch shall be incorporated in the snubber design in all directions before contact is made between the rigid and resilient surfaces. Snubber end caps shall be removable to allow inspection of internal clearances. Neoprene bushings shall be rotated to insure no short circuits exist before systems are activated. [Snubbers shall have an Anchorage Preapproval "R" Number from OSHPD in the State of California verifying the maximum certified horizontal and vertical load ratings]. Snubber shall be equal to type Z-1225 as manufactured by Mason Industries, Inc., or equivalent.

F.  All directional seismic snubbers shall consist of interlocking steel members restrained by shock absorbent rubber materials compounded to bridge bearing specifications. Elastomeric materials shall be replaceable and a minimum of 3/4 inch thick. Rated loadings shall not exceed 1000 psi. Snubbers shall be manufactured with an air gap between hard and resilient material of not less than 1/8 inch nor more that 1/4 inch. Snubbers shall be installed with factory set clearances. The capacity of the seismic snubber at 3/8 inch deflection shall be equal or greater than the load assigned to the mounting grouping controlled by the snubber multiplied by the applicable "G" force. Submittals shall include the load deflection curves up to 1/2 inch deflection in the x, y and z planes. [Snubbers shall have an anchorage preapproval "R" number from OSHPD in the state of California verifying the maximum certified horizontal and vertical load ratings]. Snubbers shall be equal to series Z-1011 as manufactured by Mason Industries, Inc., or equivalent.