substitution request - Alliance Construction Solutions

E. Plates
2. Studded Port Connections. Unless otherwise specified, all plate type heat exchangers with
connections of greater than 2" shall be equipped with studded port type connections with
the following requirements:
a. Each connection shall be equipped with a liner which prevents the process fluids
from coming in contact with the covers.
b. Liners shall be fabricated from materials which are compatible with the process
fluids (generally the same materials as the plate/gaskets).
1. Individual plates shall be pressed from a single metal sheet in one step. No multistage
pressing of one sheet is allowed. Plate inspection shall be performed during production to
ensure uniformity of pressing depth and absence of defects.
2. All plates shall be permanently marked to identify plate material, thickness, raw plate
supplier and heat numbers.
3. The plates should include the following:
F. Gaskets
a. Bridge Zone - The area that connects the port to the distribution area.
b. Drainage Chamber - The area vented to the atmosphere to prevent fluid
interleakage. The drainage chamber should include a drainage channel.
c. Distribution Zone - The top and bottom areas responsible for distributing the fluid
d. The design of plates shall be such that each plate channel can withstand the Design
Pressure with no pressure on the adjacent plate channels (Full Differential Pressure).
e. Plate design shall allow and require plate-to-plate contact for structural integrity and
elimination of vibration.
f. End plates shall be provided and sufficiently gasketed at the fixed and movable
covers to prevent hot and cold medium from coming in contact with these covers.
g. Gasket grooves in the plates shall be designed to contain the gaskets while allowing
for thermal expansion.
h. The Suspension and Guidance method should support the plates uniformly and
should mechanically align the plates during tightening. This area should be
reinforced for all plates greater than 50" in height.
1. Gaskets shall have relieving grooves in the leakage chamber zone to prevent intermixing
of fluids and to cause any leak to be visually evident at the external surface of the plate
pack.
2. One piece molded gaskets are required for all fluid sealing areas.
3. Mixing of gasket materials within fully gasketed units is not preferable.
4. The sealing system should only be used for sealing and not for alignment. Preference shall
be given to non-glued gasketing systems.
5. If an adhesive is used, it shall be compatible with the gasket material and the process
fluids. The standard adhesive shall be a 2 component epoxy glue and heat cured.
2.4 INSPECTION AND TESTING
A. Hydrostatic test shall be in accordance with ASME Section VIII Division 1, paragraph UG-99.
Project No.: 10145
550 15th Street Dual Brand Hotel
03/16/2012
23 5700 - 5 HEAT EXCHANGERS FOR HVAC