Section 15250 PIPE AND EQUIPMENT INSULATION

Section 15250

PIPE AND EQUIPMENT INSULATION

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The Contractor shall provide insulation on all exposed piping and equipment as specified herein and in accordance with the Contract Documents. In addition to the insulation shown and specified, the Contractor shall insulate any cold or hot piping and exhausts that could be hazardous to plant personnel upon contact.

B. All steam and hot or chilled water piping shall be insulated with fiberglass metal jacketed insulation to form a watertight and weatherproof system.

C. All domestic hot water piping, cold water piping, and roof drain/overflow lines which pass through spaces above finished ceilings, or are suspended over equipment, electrical panels, or cabinets shall be insulated.

D. All unions, flanges, mechanical joints, valves, strainers, and other devices in insulated piping systems shall be insulated in the same manner as the adjacent piping. Operators, instruments and other features requiring routine access shall not be covered. Insulation over removable devices shall be easily removable and replaceable.

E. Insulation on buried piping shall be per manufacturer’s requirements.

1.2 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. The work of the following sections applies to the work of this Section. Other sections of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this work:

1. General Conditions

2. Section 09800, Protective Coating

3. Section 11404, Spiral Heat Exchanger

4. Section 11621, Boiler

5. Section 15050, Piping Systems

6. Section 15061, Steel Pipe

B. All equipment, products, and their installation shall be in accordance with the following standards, as applicable, and as specified:

HH-1-558B Insulation Blocks, Boards, Blankets, Felts, Sleeving (Pipe and Tube Covering), and Pipe Fitting Covering, Thermal (Mineral Fiber, Industrial Type)

ASTM C 547 Specification for Mineral Fiber Preformed Pipe Insulation

ASTM E 84 Test Method for Surface Burning Characteristics of Building

Materials

1.3 SUBMITTALS

A. In addition to the requirements of Section 15050 and the material listed in the detailed specification, the following shall be submitted in accordance with Section 01300:

1. Complete shop drawings with dimensioned piping layout and details.

2. Manufacturer's data on materials, covering, jackets, and finish.

3. The Contractor shall include in his submittal samples of the proposed insulation system.

PART 2 - PRODUCTS

2.1 GENERAL

A. All components of the insulation, including covering, mastics and adhesives shall have a flame-spread rating of not over 25, and a smoke development rating of not over 50. Ratings shall be as established by tests in accordance with ASTM E 84 and Federal Specification standards. The integrated insulation assemblies shall also conform to the above specifications. Insulation shall be applied in strict accordance with the manufacturer's instructions.

2.2 BASIC MATERIALS

A. Standard Insulation: This type of insulation shall be employed for process, cold-and hot water, steam, air, and condensate piping and equipment with surface temperatures up to

850 degrees F. Pipe insulation shall be molded-type pipe covering, made of fibrous glass with a minimum k-factor of 0.23 at 75 degrees F mean temperature. The insulation shall be oversized for installation over electric heating cable. Unless otherwise specified the insulation thickness shall be as follows:

B. Schedule of Insulated Piping: Unless otherwise shown or indicated, the Contractor shall insulate the following piping systems:

Process or Equipment	Pipe Material System (Spec 15050)	Pipe Size (Inches)	Minimum Insulation Thickness (Inches)
HRR/HRS	8	6 and smaller	1½
		8 and larger	2
CS	15	6 and smaller	1
		8 and larger	1½
Boiler	N/A	N/A	Per Manufacturer’s Standard and Instructions
Heat Exchanger	N/A	N/A	Per Manufacturer’s Standard and Instructions
A	1	All	1 1/2

C. The insulation shall be oversized for installation over electric heating cable. Insulation shall have a factory-applied white fire-retardant vapor-barrier jacket of Kraft paper and aluminum foil laminated together and reinforced with fiberglass yarn. Fittings and valves shall be covered with the same material as the pipe, cut in segments to fit snugly without open spaces, held in place with copper wire or cement, and then covered with the same jacketing material as the pipe. Insulated fittings adjacent to vapor-barrier insulation shall be sealed with an acceptable vapor-barrier cement before installation of the finish jacket. Pipe insulation and vapor-barrier shall be continuous through hangers and supports. Insulation shall be coordinated with the pipe hangers and supports and where insulation protection shields are provided the top half section of pipe insulation at support locations shall be of the same specified density, and the bottom half insulation segments provided between the pipe and the insulation protection shields shall have a density of not less than 6 lb/cu ft. All insulation shall be covered with smooth aluminum weatherproof metal or plastic preformed jacketing with a factory attached moisture barrier. The jacket for the fittings shall consist of precision-formed smooth-sided sections and shall be sized to cover and protect the insulated fitting. Each section shall be manufactured from aluminum or PVC, and all joints shall be sealed with silicon mastic or solvent welding, to provide a continuous, air and weathertight joint. Strapping shall be ½-inch wide, Type

3003 aluminum or stainless steel. The jacket at insulated valves shall fit over the removable insulation and be easily removed and re-installed. It shall be held in place by adjustable stainless steel hose clamps.

D. High Temperature Insulation: This type of insulation shall be employed for engine exhaust pipes, flues, and similar pipes and equipment with surface temperatures up to

1200 degrees F. The high temperature insulation shall consist of 4-inch thick calcium silicate or similar pre-molded blocks with a minimum k-factor of 0.14, in two layers of 2-

inch thickness, each, with staggered joints, all applied over a 3/4-inch high metal rib lath.

The inner layer shall be suitable for 1200 degrees F, and the second layer for 1000 degrees F. All bends, voids, joints, fittings and other parts of the piping system shall be filled with insulating cement. Aluminum lagging with preformed aluminum fittings shall be banded to the insulation in a similar fashion as specified for standard insulation. Allowance shall be made for thermal expansion.

E. Underground Piping Insulation: The insulation used for below grade installations shall be provided with a moisture resistant barrier. The insulation shall be a polyurethane foam protected by a PVC jacket.

2.3 MANUFACTURERS

A. Pipe and equipment insulation shall manufactured by one of the following:

1. Armstrong World Industries, Inc.

2. Certain-Teed Corporation

3. Manville

4. Owens-Corning Fiber Glass Corp

5. Perma – Pipe / Terra-Gard

PART 3 - EXECUTION

3.1 INSTALLATION

A. All insulation shall be installed by a qualified insulation Contractor in strict accordance with the Manufacturer's recommendations and the requirements of these specifications.

B. Insulation shall be installed in accordance with the manufacturer’s published instructions. C. All piping insulation shall be installed following required testing and approval of piping by

the Resident Project Representative.

D. All seams and joints shall be sealed using the Manufacturer's standard adhesive. E. Jacket laps shall be neatly pasted in place.

F. All joints shall be pointed with insulating cement.

G. Fittings and valves shall be covered with the same material as the pipe, cut in segments to fit snugly without open spaces, held in place with copper wire or cement, and then covered with the same jacketing material as the pipe.

H. Insulation at valves and other devices shall be formed into two halves, easily removable for valve maintenance. The halves shall be constructed from segments cemented together to fit the valve and to extend over the adjacent piping insulation,

I. Insulated fittings adjacent to vapor-barrier insulation shall be sealed with acceptable vapor-barrier cement before installation of the finish jacket.

J. Pipe insulation and vapor-barrier shall be continuous through hangers and supports.

Hangers shall permit insulation to pass through. Suitable saddles shall be provided to prevent the weight of the piping from being supported by the insulation.

K. All insulation shall be installed in the presence of the Resident Project Representative.

END OF SECTION