SECTION 15481

COMPRESSED AIR PIPING

PART 1 GENERAL

1.1	SECTION INCLUDES

A.	Pipe and Pipe Fittings.

B.	Pressure Reducing Valve.

1.2	RELATED SECTIONS

A.	Section 15075 - Mechanical Identification: Identification of piping system.

1.3	REFERENCES

A.	ASME B16.3 - Malleable Iron Threaded Fittings

B.	ASME B16.18 - Cast Copper Alloy Solder Joint Pressure Fittings

C.	ASME B16.22 - Wrought Copper and Bronze Solder Joint Pressure Fittings

D.	ASME B16.26 - Cast Bronze Fittings for Flared Copper Tubes

E.	ASTM A53 - Pipe, Steel, Black and Hot-Dipped Zinc Coated, Welded and Seamless

F.	ASTM A234/A234M - Pipe Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures

G.	ASTM B32 - Solder Metal

H.	ASTM B88 - Seamless Copper Water Tube (ASTM B88M - Seamless Copper Water Tube Metric)

I.	MSS SP-80 - Bronze Gate, Globe, Angle and Check Valves

J.	MSS SP-110 - Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends

H.	ASME B31.1 - Power Piping

1.4	SUBMITTALS

A.	Product Data: Provide data on pipe materials, pipe fittings, valves, and accessories. Provide manufacturer's catalog information. Indicate valve data and rating.

B.	Manufacturer's installation instructions: Indicate hoisting and setting requirements, starting procedures.

1.5	QUALITY ASSURANCE

A.	Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this section with minimum three years documented experience.

1.6	DELIVERY, STORAGE, AND PROTECTION

A.	Accept air compressors, refrigerated air dryers, valves on site in shipping containers with labeling in place. Inspect for damage.

B.	Provide temporary protective coating on cast iron and steel valves.

C.	Provide temporary end caps and closures on piping and fittings. Maintain in place until installation.

D.	Protect piping systems from entry of foreign materials by temporary covers, completing sections of the work, and isolating parts of completed system.

1.7	MAINTENANCE PRODUCTS

A.	Operation Data: Submit for air compressor, air receiver and accessories, aftercooler, refrigerated air dryer, and pressure reducing valve.

B.	Maintenance Data: Submit for air compressor, air receiver and accessories, aftercooler, refrigerated air dryer, and pressure reducing valve.

PART 2 PRODUCTS

2.1	PIPE AND PIPE FITTINGS

A.	Steel Pipe: ASTM A53 or A120, Schedule 40 black (above ground only).

1.	Fittings: ASME B16.3, malleable iron, or ASTM A234, forged steel welding type.

2.	Joints: Threaded or welded to ANSI B31.1.

B.	Copper Tubing: ASTM B88, type K hard drawn (above ground only).

1.	Fittings: ASME B16,18, cast bronze, or ASME B16.22, wrought copper and bronze.

2.	Joints: AWS A5.8, BcuP silver braze.

2.2	VALVES

A.	Ball Valves

1.	MSS SP-110, Class 150, 400 psi (2760 kPa) CWP, bronze, two piece body, chrome plated brass ball, regular port, teflon seats and stuffing box ring, blow-out proof stem, lever handle with balancing stops, threaded ends with union.

B.	Air Outlets

1.	Quick Connector: 3/8 inch brass, snap on connector with self closing valve.

2.3	UNIONS AND COUPLINGS

A.	Unions

1.	Ferrous Pipe: 150 psi (1034 kPa) malleable iron threaded unions.

2.	Copper Tube and Pipe: 150 psi (1034 kPa) bronze unions with soldered joints.

B.	Dielectric Connections: Union with galvanized or plated steel threaded end, copper solder end, water impervious isolation barrier.

C.	Flexible Connector: Neoprene with brass threaded connectors.

2.4	PRESSURE REDUCING VALVE

A.	Pressure Reducing Station: Consisting of automatic reducing valve and low pressure side relief valve and gauge.

B.	Valve Capacity: Reduce pressure from 200 psi (1379 kPa) to 30 psi (207 kPa), adjustable upwards from reduced pressure.

PART 3 EXECUTION

3.1	INSTALLATION

A.	Install valved drip connections at low points of piping system.

B.	Install take offs to outlets from top of main, with shut off valve after take off. Slope take off piping to outlets.

C.	Install compressed air couplings, female quick connectors, and pressure gauges where outlets are indicated.

D.	Install tees instead of elbows at changes in direction of piping. Fit open end of each tee with plug.

E.	Install compressor unit on concrete housekeeping pad.

F.	Install compressor unit on vibration isolators. Level and bolt in place.

G.	Make air cock and drain connection on horizontal casing.

H.	Install line size gate valve and check valve on compressor discharge.

I.	Install replaceable cartridge type filter silencer of adequate capacity for each compressor.

J.	Place shut off valve on water inlet to aftercooler. Pipe drain to floor drain.

K.	Connect condensate drains to nearest floor drain.

L.	Install valved bypass around air dryer. Factory insulate inlet and outlet connections.

M.	Install valved drip connections at low points of piping system.

N.	Install take offs to outlets from top of main, with shut off valve after take off. Slope take off piping to outlets.

O.	Install compressed air couplings, female quick connectors, and pressure gauges where outlets are indicated.

P.	Install tees instead of elbows at changes in direction of piping. Fit open end of each tee with plug.

3.2	FIELD QUALITY CONTROL

A.	Compressed Air Piping Leak Test: Prior to initial operation, clean and test compressed air piping in accordance with ANSI B31.1.

B.	Repair or replace compressed air piping as required to eliminate leaks, and retest to demonstrate compliance.

C.	Cap and seal ends of piping when not connected to mechanical equipment.

END OF SECTION