SECTION 15535 REFRIGERANT PIPING AND SPECIALTIES

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


SECTION 15535 REFRIGERANT PIPING AND SPECIALTIES
PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Piping.

B. Refrigerant.

C. Moisture and liquid indicators.

1.2 REFERENCES

A. American National Standards Institute (ANSI):

1. ANSI/ASHRAE 34  Number Designation of Refrigerants

2. ANSI/ASME B16.22 Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings

3. ANSI/ASME B31.5  Refrigeration Piping

4. ANSI/ARI 710 Driers, Liquid-Line

B. American Society for Testing and Materials (ASTM):

1. ASTM B32  Specification for Solder Metal

2. ASTM B280 Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service

1.3 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store piping and specialties in shipping containers with labeling in place.

B. Protect piping and specialties from entry of contaminating material by leaving end caps and plugs in place until installation.


PART 2 - PRODUCTS

2.1 PIPING

A. Copper Tubing: ASTM B280, Type ACR hard drawn or annealed.

1. Fittings: ANSI/ASME B16.22 wrought copper.

2. Joints: ANSI/ASTM B32, solder Grade 95TA or ANSI/AWS A5.8 BCup silver braze.

B. Factory precharged linesets are acceptable.

2.2 REFRIGERANT

A. Refrigerant: As indicated on Condensing Unit Schedule.

2.3 MANUFACTURERS

A. All refrigeration specialties to be of same manufacturer: Sporlan or Alco.

2.4 MOISTURE AND LIQUID INDICATORS

A. Indicators: Single or Double port type, UL listed, with copper or brass body, flared or solder ends, sight glass, color coded paper moisture indicator with removable element cartridge and plastic cap; suitable for system working pressure and temperature.


PART 3 - EXECUTION

3.1 PREPARATION

A. Ream pipe and tube ends. Remove burrs.

B. Remove scale and dirt on inside and outside before assembly.

C. Prepare piping connections to equipment with flanges or unions.

3.2 INSTALLATION

A. Install refrigeration specialties in accordance with manufacturer's instructions.

B. Route piping in orderly manner, with plumbing parallel to building structure, and maintain gradient.

C. Install piping to conserve building space and not interfere with use of space.

D. Group piping whenever practical at common elevations and locations.  Slope piping one percent in direction of oil return.

E. Provide non-conducting dielectric connections when joining dissimilar metals.

F. Install piping to allow for expansion and contraction without stressing pipe, joints, or connected equipment.

G. Provide clearance for installation of insulation and access fittings.

H. Provide access to concealed fittings.

I. Where pipe support members are welded to structural building frame, brush clean, and apply one coat of zinc rich primer to welding.

J. Prepare pipe, fittings, supports, and accessories not prefinished, ready for finish painting.

K. Insulate piping per Division 15 HVAC Pipe Insulation specification.

L. Fully charge completed system with refrigerant after testing.

M. Provide refrigerant charging valve connections in liquid line between receiver shut-off valve and expansion valve.

3.3 FIELD QUALITY CONTROL

A. Test refrigeration system in accordance with ANSI/ASME B31.5.

B. Pressure test system with dry nitrogen to 200 psig. Perform final tests at 27 inches vacuum and 200 psig using halide torch electronic leak detector.  Test to no leakage.



END OF SECTION