Page Comparison

22 61 00 COMPRESSED-AIR SYSTEMS FOR LABORATORY AND HEALTHCARE FACILITIES

.01 Compressed Air Systems

1. Air Compressors
1. When after coolers are specified on air compressors, they shall be air cooled or shall be cooled with re-circulating process water.  Water cooling through equipment to drain is not permitted.

22 62 00 VACUUM SYSTEMS FOR LABORATORY AND HEALTHCARE FACILITIES

.01 Vacuum Systems

1. Vacuum pumps shall be duplex type, similar to Nash Engineering Co.

22 67 00 PROCESSED WATER SYSTEMS FOR LABORATORY AND HEALTHCARE FACILITIES

.01 High Purity Water Systems

1. The University prefers a central steam powered still for projects at University Park.
2. Any requirement for a higher grade water will be handled at the point of use, being fed from the central still unit.
3. On stills rated 5 gph and over, the steam powered heat exchanger shall be constructed of cupronickel, 10 percent nickel.  The manufacturer shall verify in writing that the heat exchanger is so constructed.
1. We are picking up large amounts of copper deposits on the boiler tubes, so to eliminate this problem the University requests that no copper heat exchangers be installed.
4. Condensing water to drain is not permitted.
5. All parts of the still in contact with the steam vapor and distillate shall be tin or tin-coated copper.  The tin must be 99.97 percent pure and the coating thickness a minimum of 0.001 inch.  Specifications should be written around Barnstead.