Plate Heat Exchangers

j.

Finish: Apply corrosion protection system to the outside of

galvanized surfaces. Construct non-stainless metal components of

mill hot-dip galvanized steel. Coat component edges and welds

with a 95 percent pure zinc-rich compound. Preparation for

coating shall include degreasing, cleaning, and a light surface

burnishing. The coating shall be suitable for field repair with

the same original coating material applied in the same manner.

k.

Electric Pan Heater Package: Electric pan heater package consists

of electric immersion heaters, heater thermostat, and low water

cutout, all installed in pan. Size heaters to maintain +5 degrees

C +40 degrees F pan water temperature with the fans off at design

conditions indicated on drawings. Control the heaters with a

thermostat, and provide water cutout to prevent heaters from

cycling on unless they are completely submerged. Provide heater

contactor and wiring under Section 16402 INTERIOR DISTRIBUTION

SYSTEM.

l.

Discharge Hood With Positive Closure Dampers: Provide unit with

discharge hood, positive closure dampers, and 120-volt actuator

for reduction of heat loss during idle periods of winter time

operation. Construct the discharge hood and dampers of hot dipped

galvanized steel. Equip hoods with access panels to facilitate

maintenance on the eliminators and water distribution system.

Factory assemble the dampers, damper actuator, and linkage.

]2.1.4

Plate Heat Exchangers

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NOTE: Plate heat exchangers are required in systems

using closed circuit coolers or cooling towers to

isolate the ground heat exchanger loops from the

building terminal loops.

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NOTE: Provide the following flat plate heat

exchanger information on the drawing:

1. Maximum water pressure drop through clean plates

and headers in kPa psi at the flow rates and

temperatures indicated.

2. Minimum rate of turbulent flow in l/sec gpm

through any two plate segment.

3. Minimum plate thickness in mm inch.

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Plates, frames, and gaskets shall be designed for a working pressure of

2.07 MPa 300 psi and factory tested at 31.0 MPa 450 psi. Medium

temperature water, low temperature water, and pressure relief valve

connections shall be located in accordance with the manufacturer's standard

practice. Connections larger than 80 mm 3 inches shall be ASME 2.07 MPa

300 pound flanged. Plates shall be corrugated [Type 304 stainless steel]

[Type 316 stainless steel] [nickel-iron-chromium alloy conforming to ASTM B

424] [nickel-molybdenum alloy conforming to ASTM B 333] [titanium alloy

conforming to ASTM B 265].

SECTION 15741N

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