**November 21, 1997**

**Contract \# TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 15201-S**

**[SEISMIC RESTRAINT OF MECHANICAL]{.underline}**

**[SYSTEMS AND EQUIPMENT]{.underline}**

[Page]{.underline}

[PART 1 - GENERAL]{.underline}

1.01 Scope 2

1.02 Submittal Data Requirements 3

1.03 Code and Standards Requirements 5

1.04 Manufacturer's Responsibility 5

1.05 Related Work 5

1.06 Seismic Force Levels 6

[PART 2 - PRODUCTS]{.underline}

2.01 Intent 7

2.02 Acceptable Manufacturers 7

2.03 Anchorage 7

[PART 3 - EXECUTION]{.underline}

3.01 General 8

3.02 Seismic Restraint of Piping 9

3.03 Seismic Restraint of Ductwork 9

3.04 Seismic Restraint of Mechanical Equipment 10

3.05 Seismic Restraint Exclusions 10

**SPECIAL SPECIFICATION**

**SECTION 15201-S**

**[SEISMIC RESTRAINT OF MECHANICAL]{.underline}**

**[SYSTEMS AND EQUIPMENT]{.underline}**

[PART 1 - GENERAL]{.underline}

l.0l [SCOPE]{.underline}

A**.** Intent

> 1\. It is the intent of this specification to keep all mechanical
> building system components in place during a seismic event.
>
> 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\. Any variance or non-compliance with these specification
> requirements shall be corrected by the contractor in an approved
> manner.
>
> 4\. Seismic restraints shall be designed in accordance with seismic
> force levels as detailed in section 1.0.6.

B. The work in this section includes, but is not limited to the
following:

1\. Seismic restraint for piping, ductwork, isolated equipment and
non-isolated equipment.

2\. Equipment buried underground is excluded but entry of services
through the foundation wall is included. Typical equipment includes but
is not limited to the following:

[HVAC]{.underline} [PLUMBING/PIPING]{.underline}

Air Dist. Boxes Compressors

Fans Water Heaters

Unit Heaters Variable Freq. Drives

Var. Freq. Drives Heat Exchangers

A/C Units Air Separators

[HVAC cont'd]{.underline} [PLUMBING/PIPING cont'd]{.underline}

Air Filter Housings Boilers

Air Handling Units Pumps

Heat Exchangers Piping Lines Condensing Units Plumbing Lines

Condensers

Duct Mounted Equipment

Ductwork

C. Definitions

1\. Positive Attachment:

> a\. A positive attachment is defined as a concrete anchor, a double
> sided beam clamp loaded perpendicular to a beam, or bolted connection
> to structure. Single sided \"C\" type beam clamps for support rods of
> overhead piping, ductwork, fire protection, or any other equipment are
> not acceptable on this project as seismic anchor points.

2\. Transverse Bracing:

a\. Restraint(s) applied to limit motion perpendicular to the centerline
of the pipe, duct or conduit.

3\. Longitudinal Bracing:

a.  Restraint(s) applied to limit motion parallel to the centerline of
    the pipe, duct or conduit.

1.02 [SUBMITTAL DATA REQUIREMENTS]{.underline}

> A. The manufacturer of seismic restraints shall provide submittals for
> products as follows:

1\. Descriptive Data:

> a\. Catalog cuts or data sheets on and specific restraints detailing
> compliance with the specification.
>
> b\. Detailed schedules of flexible and rigidly mounted equipment,
> indicating types and configuration of seismic restraints.

2\. Shop Drawings:

a.  Submit fabrication details for equipment bases including dimensions,
    structural member sizes and support point locations.

> b\. Provide all details of suspension and support for ceiling hung
> equipment.
>
> c\. Where walls, floors, slabs or supplementary steel work are used
> for seismic restraint locations, details of acceptable attachment
> methods for ducts, 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.
>
> d\. Provide specific details of seismic restraints and anchors;
> include number, size and locations for each piece of equipment.
>
> e\. Submit on the above in accordance with section 1300-S.

3\. Seismic Certification and Analysis:

> a\. 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.
>
> b\. All restraining devices shall have a preapproval number from
> California OSHPD or some other recognized government agency showing
> maximum restraint ratings. Preapprovals based on independent testing
> are preferred to preapprovals based on calculations. Where preapproved
> devices are not available, submittals based on independent testing are
> preferred. Calculations (including the combining of tensile and shear
> loadings) to support seismic restraint designs must be stamped by a
> registered professional engineer with at least five years of seismic
> design experience and licensed in the state of the job location.
> Testing and calculations must include both shear and tensile loads as
> well as one test or analysis at 45E to the weakest mode.
>
> c\. Analysis must indicate calculated dead loads, static seismic loads
> and capacity of materials utilized for connections to equipment and
> structure. Analysis must detail anchoring methods, bolt diameter,
> embedment and/or welded length. All seismic restraint devices shall be
> designed to accept, without failure, the forces detailed in section
> 1.06 acting through the equipment center of gravity. Overturning
> moments may exceed forces at ground level.

1.03 [CODE AND STANDARDS REQUIREMENTS]{.underline}

A. Applicable codes and Standards

> 1\. SMACNA, Seismic Restraint Manual: Guidelines for Mechanical
> Systems, 1991
>
> 2\. Uniform Building Code, 1994

1.04 [MANUFACTURER'S RESPONSIBILITY]{.underline}

> A. Manufacturer of seismic restraint shall have the following
> responsibilities:

1\. Determine seismic restraint sizes and locations.

2.  Provide seismic restraints as scheduled or specified.

3.  Provide calculations and materials as required for seismic restraint
    of isolated and unisolated equipment.

> 4\. Provide installation instructions, drawings and trained field
> supervision to insure proper installation and performance.

1.05 [RELATED WORK]{.underline}

A. Supplementary Support Steel

> 1\. Contractor shall supply supplementary support steel for all
> equipment, piping, ductwork, etc. including roof mounted equipment, as
> required or specified.

B. Attachments

> 1\. Contractor shall supply restraint attachment plates cast into
> housekeeping pads, concrete inserts, double sided beam clamps, etc. in
> accordance with the requirements of the seismic restraint vendor\'s
> calculations.

2\. Capacity, as indicated on Structural drawings, for concrete inserts
used for support attachment shall not be exceeded for the combination of
gravity and seismic loads on the support.

> C. Gravity support requirements specified in other sections and/or
> shown on drawings must be considered in combination with seismic
> restraint requirement in this section. Whenever, conflicting
> requirements occur between this section and other sections or drawing,
> the most stringent shall apply.

1.06 [SEISMIC FORCE LEVELS]{.underline}

A.  Seismic loads are to be based on the 1994 Uniform Building Code
    using the following:

Z=0.22

I=1.25

> Cp (for all systems and equipment except non-rigid and flexibly
> supported equipment)=0.75

Cp (for non-rigid and flexibly supported equipment)=1.5

[PART 2 - PRODUCTS]{.underline}

2.01 [INTENT]{.underline}

> A. For the purposes of this project, failure is defined as the
> discontinuance of any attachment point between equipment or structure,
> vertical permanent deformation greater than 1/8 inch and/or horizontal
> permanent deformation greater than 1/4 inch.

2.02 [ACCEPTABLE MANUFACTURERS]{.underline}

> A. Subject to compliance with requirements, provide seismic restraint
> products from any of the following:

1.  Mason Industries, Inc.

2.  B-Line Systems, Inc.

3.  Unistrut Corporation

4.  Grinnel Corporation

B. [Substitutions]{.underline}: only under provisions of Section 1600-S.

2.03 [ANCHORAGE]{.underline}

> A. Seismic restraints anchored to concrete shall use embedded anchor
> bolts, adhesive anchors, or undercut anchors. Expansion anchors shall
> not be used. Anchorage to the structural waffle slabs shall be to
> cold-formed embedments as shown on drawings.

[PART 3 ‑ EXECUTION]{.underline}

3.0l [GENERAL]{.underline}

> A. All seismic restraint systems must be installed in strict
> accordance with the manufacturers written instructions and all
> certified submittal data.
>
> B. Installation of seismic restraints must not cause any change of
> position of equipment, piping or duct work resulting in stresses or
> misalignment.
>
> C. Coordinate work with other trades to avoid rigid contact with the
> building.
>
> D. Any conflicts with other trades which will result in rigid contact
> with equipment or piping due to inadequate space or other unforeseen
> conditions should be brought to the architects/engineers attention
> prior to installation. Corrective work necessitated by conflicts after
> installation shall be at the responsible contractors expense.

E.  Bring to the architects/engineers attention any discrepancies
    between the specifications and the field conditions or changes
    required due to specific equipment selection, prior to installation.
    Corrective work necessitated by discrepancies after installation
    shall be at the responsible contractors expense.

F.  Correct, at no additional cost, all installations which are deemed
    defective in workmanship and materials at the contractors expense.

G.  Attach hangers to joist panel points unless approved calculations
    indicate the attached loads are less than 150 pounds.

> H. Provide supplementary steel where required to bridge between joists
> or to transmit loads to panel points. Submit for approval
> Supplementary Steel Shop Drawings or sketches indicating member sizes
> and method of attachment. Do not begin fabrication of the
> supplementary steel until approval is received.
>
> I. Overstressing of the building structure must not occur because of
> overhead support of equipment. Contractor must submit loads to the
> structural engineer of record for approval. Generally bracing may
> occur from:

1\. Flanges of structural beams.

2\. Upper truss cords in bar joist construction.

3\. Cast in place inserts or concrete anchors.

3.02 [SEISMIC RESTRAINT OF PIPING]{.underline}

A. Seismically restrain all piping listed as a, b or c below.

> 1\. Gas piping, LN2 piping, and compressed air piping that is 1\" I.D.
> or larger.

2\. Piping located in boiler rooms, and mechanical equipment rooms that
is 1 1/4\" I.D. and larger.

3\. All other piping 2 1/2\" diameter and larger.

> B. Transverse piping restraints shall be at 40\' maximum spacing for
> all pipe sizes, except where lesser spacing is required to limit
> anchorage loads.
>
> C. Longitudinal restraints shall be at 80\' maximum spacing for all
> pipe sizes, except where lesser spacing is required to limit anchorage
> loads.
>
> D. Where thermal expansion is a consideration, guides and anchors may
> be used as transverse and longitudinal restraints provided they have a
> capacity equal to or greater than the restraint loads in addition to
> the loads induced by expansion or contraction.
>
> E. For LN2 and all gas piping transverse restraints must be at 20\'
> maximum and longitudinal restraints at 40\' maximum spacing.
>
> F. Transverse restraint for one pipe section may also act as a
> longitudinal restraint for a pipe section of the same size connected
> perpendicular to it if the restraint is installed within 24\" of the
> elbow or TEE or combined stresses are within allowable limits at
> longer distances.
>
> G. Hold down clamps must be used to attach pipe to all trapeze members
> before applying restraints in a manner similar to clevis supports.
>
> H. Branch lines may not be used to restrain main lines.
>
> I. All fire protection piping shall be braced in accordance with NFPA
> 13 and 14.

3.03 [SEISMIC RESTRAINT OF DUCTWORK]{.underline}

> A Seismically restrain all duct work as listed below:
>
> 1\. Restrain rectangular ducts with cross sectional area of 6 sq.ft.
> or larger.
>
> 2\. Restrain round ducts with diameters of 28\" or larger.
>
> 3\. Restrain flat oval ducts the same as rectangular ducts of the same
> nominal size.
>
> B. Transverse restraints shall occur at 30\' intervals or at both ends
> of the duct run if less than the specified interval. Transverse
> restraints shall be installed at each duct turn and at each end of a
> duct run.
>
> C. Longitudinal restraints shall occur at 60\' intervals with at least
> one restraint per duct run. Transverse restraints for one duct section
> may also act as a longitudinal restraint for a duct section connected
> perpendicular to it if the restraints are installed within 4\' of the
> intersection of the ducts and if the restraints are sized for the
> larger duct. Duct joints shall conform to SMACNA duct construction
> standards.
>
> D. The ductwork must be reinforced at the restraint locations.
> Reinforcement shall consist of an additional angle on top of the
> ductwork that is attached to the support hanger rods. Ductwork is to
> be attached to both upper angle and lower trapeze.
>
> E. A group of ducts may be combined in a larger frame so that the
> combined weights and dimensions of the ducts are less than or equal to
> the maximum weight and dimensions of the duct for which bracing
> details are selected.
>
> F. Walls, including gypsum board non bearing partitions, which have
> ducts running through them may replace a typical transverse brace.
> Provide channel framing around ducts and solid blocking between the
> duct and frame.

3.04 [SEISMIC RESTRAINT OF MECHANICAL EQUIPMENT]{.underline}

A.  All mechanical equipment shall be seismically restrained.

B.  Seismic snubbers for isolated equipment will be provided as
    indicated in Specification 15200, Vibration Limits and Control.

3.05 [SEISMIC RESTRAINT EXCLUSIONS]{.underline}

A.  Piping

1\. All piping less than 2 1/2\" in diameter except those listed below.

2\. All gas piping and LN2 gas piping less than 1\" I.D..

3\. All piping in boiler and mechanical equipment rooms less than 1
1/4\" I.D.

> 4\. All clevis or trapeze supported piping suspended from hanger rods
> where the point of attachment is less than the 12\" in length from the
> structure to the structural connection of the clevis or trapeze.
>
> 5\. All PVC and fiberglass suspended waste or vent pipe 6\" in
> diameter and smaller.

B. Ductwork

1.  Rectangular, square or oval ducts less than 6 sq.ft. in cross
    sectional area.

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2.  Round duct less than 28\" in diameter.

3.  Duct supported by hanger rods where the point of attachment is less
    than 12\" in length from the structure to the structural connection
    of the duct work.

C. Equipment

> 1\. Equipment weighing less than 50 lbs.

END OF SECTION