33 63 00 STEAM ENERGY DISTRIBUTION

.01 Steam

1. Characteristics at University Park Campus
1. Low pressure steam (where available) 10-12 psi summer, 5-12 psi winter; design for 5 psi.
2. High pressure steam (where available) 150 psi.  Pressures may fluctuate to a low of 90 psig in winter.
2. Characteristics at other locations
1. For characteristics at other locations, discuss with Engineering Services.
3. Distribution Systems
1. Steam Mains
1. Use concrete trench design for steam, condensate, and compressed air.  For details, contact Engineering Services.  Any other types of underground piping systems must be discussed with Engineering Services.
2. Expansion shall be taken up with expansion joints in manholes.  Expansion joints shall be Advanced Thermal Systems Type TP2, no substitutions.  Underground offsets and loops will be permitted on a case by case basis.  Design piping expansion for 250 psi.
3. Ball joints are not normally used.  Where they must be used, because of field requirements, use the injectable packing type.  Advanced Thermal Systems Series "P2" ball joint shall be used with no substitutions.
4. Drip stations shall be provided at all low points and every 150'-200' of run.  Refer to Division 23 22 00 for arrangement of drip station.
5. Steam manholes require specific discussions with Engineering Services.
2. Steam Meters
1. Steam meters shall be selected and sized by Engineering Services. The professional shall provide building steam load to Engineering Services for steam meter sizing. 
2. Steam meters shall be provided and installed by Utility Services.  Contractor shall install orifice flanges supplied by Utility Services.  Location of orifice flanges shall be specified by Engineering Services.  Utility Services shall install the meter transmitter.  Contractor shall provide and connect power to the transmitter from the building BAS system.
3. The Professional shall provide for and indicate an adequate straight run of pipe on drawings for an orifice meter installation.
3. Condensate Pumps
1. Condensate pumps shall be duplex, not to exceed 1,800 rpm, with alternator; both pumps to come on at high level.  Discuss discharge head with the University.  Install check valves to prevent circulation through inactive pump.  See Detail 15G-C for piping at meter and condensate return pumps.
• Discharge shall have a ball or plug valve with memory stop to provide for pump discharge pressure adjustment.
2. Consideration shall be given to using Pressure Powered condensate pumps by Spirax/Sarco or equal, where economically justified.  Pumps shall use air for pumping where possible.
3. See Detail 15G-D for piping connections at pressure powered condensate pumps.  Details are not yet available in WEB-based manual
4. All steam fittings shall be ANSI Class 150 for low pressure steam and ANSI Class 300 for high pressure steam.
4. Steam, Condensate, and Compressed Air Valves
1. Steam valves shall be steel laminated seat zero leakage triple offset butterfly valves.  All valves to have gear operators.  Steam valves shall be ANSI Class 150 for low pressure steam and ANSI Class 300 for high pressure steam.  Valves material and construction shall be approved by Engineering Services.  Cast iron valves shall not be used.  Acceptable manufacturers are Adams, Tricentric, Zwick and Vanessa.
2. Condensate valves 2 inch and smaller shall be stainless steel ball valves; e.g., Apollo.  Larger valves shall be high performance butterfly valves; e.g., Jamesbury or Keystone.  Valves material and construction shall be approved by Engineering Services.  Cast iron valves shall not be used. 
3. Compressed air valves shall be stainless steel ball valves.
4. Tests of Steam Distribution Piping
1. New steam distribution piping systems which connect to existing hot steam lines shall be tested as follows:
1. The new system shall be installed and the ends of the lines blanked off prior to making the connection to the existing hot line.
2. The line shall then be hydrostatically tested as specified and thoroughly flushed out.
3. Make final connections to existing hot lines, energize, and waste condensate.
4. De-energize and open and clean all dirt legs and strainers.
• (The purpose of this test is twofold:  (1) To stress line under expanded conditions prior to hydro test; and (2) To knock off and then flush out as much mill scale and debris as possible.)

.02 Air

1. Characteristics
1. Line pressure 60-80 pounds.  This is central plant air and is available on most of the University Park Campus.  Provide proper dryer and separator tanks with automatic blowdown piped to nearest drain, and provide refrigerated air dryer with automatic blowdown piped to nearest drain.
2. Oil removal equipment must be provided in the building.
3. Central air is not available at other locations.
2. Distribution Systems
1. Underground compressed air piping shall be fiberglass reinforced plastic (Fibercast, Centricast Plus RB-2530).  Where piping passes through manholes, convert to steel with flanges.
2. Piping shall have a trap, with a half-inch ss ball valve and an automatic drain located at the low point where the piping enters the building.  In addition, half-inch ss ball valves with brass plugs shall be provided at all low points to bleed entrapped moisture.  Provide oil filters in the lines as needed.
3. All underground fiberglass piping shall have a twelve gauge stranded copper tracer wire attached to the top of the pipe.
3. System Tests
1. All air lines shall be tested at 100 psi air pressure for a period of four (4) hours using test connections and testing equipment furnished by the Contractor.  The only permissible drop in pressure shall be that due to temperature drop.