final 23 21 13 Hydronic Piping and Specialties.pdf

OFFUTT AIR FORCE BASE

(092036) 23 21 13-1 (Repair AHU O-Club, B462)

2010 by FEI

SECTION 23 21 13

HYDRONIC PIPING AND SPECIALTIES

PART 1 - GENERAL

1.1 WORK INCLUDED

A. This Section includes piping systems for hot water heating, chilled water cooling, heat pump loop, glycol loop, make-up water for these systems, blow-down drain lines, and condensate drain piping.

B. Types of hydronic piping and specialties specified in this section include the following:

1. Piping and Fittings

2. Automatic Flow Control Valves

3. Air Vents

4. Air Separators

5. Y Pattern Strainers

1.2 SUBMITTALS

A. Product Data: From manufacturer's, for hydronic specialty and special duty valves listed below, include rated capacities of selected models, weights (shipping, installed, and operating), furnished specialties and accessories, and installation instructions.

1. Calibrated plug valve flow and pressure drop curves based on manufacturer's testing.

2. Automatic flow control valves.

3. Air separators.

4. Diaphragm-type expansion tanks.

5. Y pattern strainers.

B. Maintenance Data: For hydronic specialties and special duty valves, for inclusion in operation and maintenance manual.

1.3 QUALITY ASSURANCE

A. Regulatory Requirements:

1. ASME Compliance: Fabricate and stamp air separators and compression tanks to comply with ASME Boiler and Pressure Vessel Code, Section VIII, Division 1.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturer: Subject to compliance with requirements, provide hydronic piping system products from one (1) of the following:

1. Automatic Flow-Control Valves:

a. Flow Design.

b. Griswold Controls.

(092036) 23 21 13-2 (Repair AHU O-Club, B462)

c. Nexus.

2. Air Vents (manual and automatic):

a. Armstrong Machine Works.

b. Bell & Gossett ITT; Fluid Handling Div.

c. Hoffman Specialty ITT; Fluid Handling Div.

d. Spirax Sarco.

3. Air Separators:

a. Amtrol, Inc.

b. Armstrong Pumps, Inc.

c. ITT Fluid Technology Corp.; ITT Bell & Gossett

d. Taco, Inc.

4. Y-Pattern Strainers:

a. Armstrong Machine Works

b. Hoffman Specialty ITT; Fluid Handling Div.

c. Metraflex Co

d. Spirax Sarco

e. Trane Co.

f. Victaulic Company of America

2.2 PIPE MATERIALS

A. General: 2-1/2” and larger refer to Steel Pipe Schedule on drawings. 2” and smaller refer to Copper

Pipe Schedule on drawings.

2.3 FITTINGS

A. General: 2-1/2” and larger refer to Steel Pipe Schedule on drawings. 2” and smaller refer to Copper

Pipe Schedule on drawings.

2.4 JOINING MATERIALS

A. Solder Filler Metals: ASTM B 32, 95-5 tin antimony.

2.5 SPECIAL DUTY VALVES

A. General: Special duty valves are specified in this Article by their generic name; refer to Part 3 Article

"VALVE APPLICATION" for specific uses and applications for each valve specified.

B. Calibrated Plug Valves: 125 PSIG water working pressure, 250F maximum operating temperature, bronze body, plug valve with calibrated orifice. Provide with connections for portable differential pressure meter with integral check valves and seals. Valve shall have integral pointer and calibrated scale to register degree of valve opening. Valves 2-inch and smaller shall have threaded connections.

Valves 2-1/2-inch and larger shall have flanged connections.

C. Automatic Flow Control Valves: Class 150, cast-iron housing, stainless steel operating parts; threaded connections for 2-inch and smaller, flanged connections for 2-1/2-inch and larger. Factory set to automatically control flow rates within plus or minus 5% design, while compensating for system

(092036) 23 21 13-3 (Repair AHU O-Club, B462) operating pressure differential. Provide quick disconnect valves for flow measuring equipment.

Provide a metal identification tag with chain for each valve, factory marked with the zone identification, valve model number, and flow rate in GPM.

1. Provide flow and pressure range as required for each application.

2.6 HYDRONIC SPECIALTIES

A. Manual Air Vent: Bronze body and nonferrous internal parts; 175 PSIG working pressure, 250F operating temperature; manually operated with screwdriver or thumbscrew; and having 1/8-inch discharge connection and 1/4-inch inlet connection.

B. Automatic Air Vent: Designed to vent automatically with float principle; bronze body and non-ferrous internal parts; 150-PSIG working pressure, 250 o F operating temperature; with 1/4-inch NPS discharge connection and 1/2-inch NPS inlet connection.

C. Air Separator and Separator/Strainer: Size and number as indicated; construct of welded carbon steel for 125 PSIG working pressure, 375 o F maximum operating temperature. Provide NPT or flanged tangential nozzles, stainless steel air collector tube with 5/32-inch diameter perforations and 63% open area. Separator shall be provided with an NPT vent connection, and NPT blowdown connection.

Separator shall be tested and labeled in accordance with ASME Pressure Vessel Code, Section VIII, Division 1.

1. Separator/Strainer: The separator shall be equipped with a galvanized steel system strainer with 3/16-inch diameter perforations and a free area not less than five times the cross-sectional area of the connecting pipe.

D. Y-Pattern Strainers: Cast-iron body (ASTM A 126, Class B), flanged ends for 2-1/2-inch and larger, threaded connections for 2-inch and smaller, bolted cover, perforated Type 304 stainless steel basket, bottom drain connection; 175 PSIG working pressure.

PART 3 - EXECUTION

3.1 PIPE APPLICATIONS

A. Where copper tubing is allowed, use Type L, drawn copper tubing with wrought copper fittings and solder joints for 2-inch and smaller, above ground, within building. Use Type K, annealed temper copper tubing for 2-inch and smaller without joints, below ground or within slabs. Mechanical fittings

(crimp or flair) are not permitted.

B. Where steel pipe is allowed, use steel pipe with threaded fittings or Pressfit joints for 2-inch and smaller, and with welded or grooved joints for 2-1/2-inch and larger.

C. In systems containing glycol-based solution, galvanized piping, valves or fittings, or any other component containing zinc is prohibited.

3.2 PIPING INSTALLATIONS

A. Locations and Arrangements: Drawings (plans, schematics, and diagrams) indicate the general location and arrangement of piping systems. Locations and arrangements of piping take into consideration pipe sizing and friction loss, expansion, pump sizing, and other design considerations.

So far as practical, where shown install piping as indicated.

(092036) 23 21 13-4 (Repair AHU O-Club, B462)

B. Extreme care shall be exercised by the Contractor to prevent dirt and other foreign matter from entering pipe or components of system during construction. Pipe stored on Project shall have open ends capped and equipment shall have all openings fully protected. Before erection, each piece of pipe, fitting or valve shall be visually examined and all dirt removed.

C. Install piping at a uniform grade of 1-inch in 40-feet upward in the direction of flow.

D. Make reductions in pipe sizes using eccentric reducer fitting installed with the level side up.

E. Install branch connections to mains using Tee fittings in main with take-off out the bottom of the main, except for up-feed risers which shall have take-off out the top of the main line.

F. Install unions in pipes 2-inch and smaller, adjacent to each valve, at final connections each piece of equipment, and elsewhere as indicated. Unions are not required on flanged devices.

G. Install flanges on valves, apparatus, and equipment having 2-1/2-inch and larger connections.

H. Install flexible connectors at inlet and discharge connections to pumps (except inline pumps) and other vibration producing equipment.

I. Install strainers on the supply side of each control valve, pressure reducing valve, pressure regulating valve, solenoid valve, inline pump, and elsewhere as indicated. Install nipple and ball valve in blow down connection of strainers 2-inch and larger.

J. Anchor piping to ensure proper direction of expansion and contraction.

K. Support: The requirements of MSS-SP-69 "Pipe Hangers and Support - Selection and Application" shall, in general, govern the installation of hangers and supports, in accordance with the manufacturer's recommendations and with the following minimum spacings:

Nominal Pipe Size (Inches) Max. Span Between Supports (Feet)

3/4 8

1 9

1-1/4 11

1-1/2 12

2 12

2 1/2 12

3 12

4 14

5 14

6 16

3.3 VALVE APPLICATIONS

A. General Duty Valve Applications: The Drawings indicate valve types to be used. Where specific valve types are not indicated the following requirements apply:

1. Shut-off duty: Use ball and butterfly valves.

2. Throttling duty: Use ball and butterfly valves.

(092036) 23 21 13-5 (Repair AHU O-Club, B462)

3. Install shut-off duty valves at each branch connection to supply and return mains, at supply and return connection to each piece of equipment, and elsewhere as indicated.

4. Install throttling duty valves at each branch connection to return mains, at return connections to each piece of equipment, and elsewhere as indicated.

B. Install calibrated plug valves on the outlet of each heating or cooling element and elsewhere as required to facilitate system balancing.

C. Install drain valves at low points in mains, risers, branch lines, and elsewhere as required for system drainage.

D. Note that all valves required by this Section may not be shown on the drawings.

3.4 HYDRONIC SPECIALTIES INSTALLATION

A. Install manual air vents at high points in the system, at heat transfer coils, and elsewhere as required for system air venting. For inaccessible vent locations, the vent piping shall be piped to a location where vent will be accessible.

B. Install compression tanks above air separator. Install gage glass and cocks on end of tank. Install tank fitting in tank bottom and charge tank. Use manual vent for initial fill to establish proper water level in tank.

1. Support tank as detailed on the Drawings. In the absence of details, provide support from the floor or structure above sufficient for the weight of the tank, piping connections, and fittings, plus weight of water assuming a full tank of water. Do not overload building components and structure members.

C. Note that all hydronic specialties required by this Section may not be shown on the drawings.

3.5 FIELD QUALITY CONTROL

A. Testing Preparation: Prepare hydronic piping according to ASME B31.9 and as follows:

1. Leave joints, including welds, uninsulated and exposed for examination during test.

2. Provide temporary restraints for expansion joints that cannot sustain reactions due to test pressure. If temporary restraints are impractical, isolate expansion joints from testing.

3. Flush system with clean water. Clean strainers.

4. Isolate equipment that is not subjected to test pressure from piping. If a valve is used to isolate equipment, its closure shall be capable of sealing against test pressure without damage to valve. Flanged joints where blinds are inserted to isolate equipment need not be tested.

5. Install relief valve set at a pressure no more than one-third higher than test pressure, to protect against damage by expanding liquid or other source of overpressure during test.

B. Testing: Test hydronic piping as follows:

1. Use ambient temperature clean water as testing medium.

(092036) 23 21 13-6 (Repair AHU O-Club, B462)

2. Use vents installed at the high points of system to release trapped air while filling system. Use drains installed at low points for complete removal of liquid.

3. Examine system to see that equipment and parts that cannot withstand test pressures are properly isolated. Examine test equipment to ensure that it is tight and that low-pressure filling lines are disconnected.

4. Subject piping system to hydrostatic test pressure that is not less than 1.5 times the design pressure. Test pressure shall not exceed maximum pressure for any vessel, pump, valve, or other component in system under test. Check to verify that stress due to pressure at bottom of vertical runs does not exceed either 90% of specified minimum yield strength or 1.7 times "SE" value in Appendix A of ASME B31.9, Code for Pressure Piping, "Building Services Piping."

5. After hydrostatic test pressure has been applied for at least 10 minutes, examine piping, joints, and connections for leakage. Eliminate leaks by tightening, repairing, or replacing components as appropriate, and repeat hydrostatic test until there are no leaks.

6. Prepare written report of testing and submit to Project Engineer and Owner's Representative for review.

3.6 ADJUSTING AND CLEANING

A. Clean and flush hydronic piping systems. Remove, clean, and replace strainer screens. After cleaning and flushing hydronic piping system, but before balancing, remove disposable fine mesh strainers in pump suction diffusers.

B. Close drains and refill systems for operation under normal closed loop conditions. HVAC Contractor shall add trisodium phosphate in an aqueous solution to system, prepared in a proportion of 1 lb/50 gallons of water in the system. After system is filled with this solution, the circulating pump should be started, trapped air vented, and the boiler set to supply approximately 100 o F loop temperature.

Solution shall circulate for approximately three (3) hours.

C. System then shall be drained completely and refilled with fresh water. After system has been completely cleaned as specified herein, it shall be tested by litmus paper or other dependable methods and left on slightly alkaline side (PH 7.5). If system is still on acid side, cleaning by use of trisodium phosphate shall be repeated.

END OF SECTION