substitution request - Alliance Construction Solutions

7. Tightening bolts shall be equipped with lockwashers at the movable cover to facilitate
opening and closing of the unit from the fixed cover. Bearing Box Washers shall be
supplied at the fixed cover on all units greater than 50" in height.
8. Plate and carrying bar design shall permit the removal of any plate in the plate pack
without the need to remove any other plates.
9. Tightening bolts shall be equipped with captive nuts at the fixed cover and threaded nuts at
the movable cover. Welding of the nut to the tightening bolt is prohibited. Tightening bolts
shall be coated with a rust preventative lubricant. In addition, a protective sleeve shall be
installed on all exposed threads.
10. The bolting system shall be designed such that only four (4) tightening bolts are required
for 80% of the pressure plate travel during opening and closing of the unit. This is required
to minimize maintenance downtime.
11. The plate pack shall be covered with a shroud in accordance with OSHA. Preference shall
be given to stainless steel.
12. The mechanical alignment system of the plates shall be designed to minimize horizontal
(perpendicular to carrying bar) and vertical movement of the plates. This alignment system
shall be built into the carrying and guide bars as well as pressed into the plate pattern. No
alignment with the use of the gaskets is permitted.
13. Lifting devices shall be supplied on all units with 6" ports or larger. These shall be designed
to support one and a half times the unit's weight. Instructions for lifting shall be clearly
visible on the unit.
C. Surface Preparation and Painting
1. The following requirements shall be adhered to for all carbon steel components excluding
tightening bolts and fasteners:
2. Preblast Preparation
a. Rough and/or sharp edges shall be broken with a power grinder.
b. All threaded openings shall be sealed.
c. All surfaces shall be solvent cleaned per SSPC requirement SP-1.
3. Blasting Requirements
a. All steel surfaces to be coated shall be cleaned by blasting metal in accordance with
SSPC requirement SP- IO.
b. The surface anchor profile shall adhere to the painting manufacturer's
recommendations and shall be recorded.
4. Painting Application Requirements
D. Connections
a. Painting shall commence within four hours of blasting.
b. Surfaces shall be clean, free from dust, and dry before painting or application of
any coating.
c. All paints shall be furnished mixed and applied in accordance with the
manufacturer's recommendations.
d. The finish coat shall be inspected for adequate total dry film thickness over its entire
surface.
1. Connections equal to or less than 2" shall be NPT type.
Project No.: 10145
550 15th Street Dual Brand Hotel
03/16/2012
23 5700 - 4 HEAT EXCHANGERS FOR HVAC