Documents
Resources
Learning Center
Upload
Plans & pricing Sign in
Sign Out

Scope of Work - Air Cooled Heat Exchanger

VIEWS: 28 PAGES: 2

									                                                  Scope of Work
                                            Air Cooled Heat Exchanger
                                            Hot Springs National Park
                                              Hot Springs, Arkansas

Hot Springs National Park has a thermal water cooling station that is located on the north end of
Bathhouse Row. Its main function is to cool a certain portion of the thermal water, thereby allowing the
supply of hot and cooled thermal water to bathhouses and concessions. The heat exchangers are a pair of
large radiator cores mounted on steel frame towers with fan forced cooling air though the system. The
current radiators were made by Young Radiator Company, Racine, Wisconsin; Model No. HC1212,
Serial Number YM5803, Order 1-12820.

Contractor shall replace existing air cooled heat exchanger tube assemblies in two air cooled heat
exchangers. Tube assemblies will be mounted on existing framework.

The new assemblies will be sized to cool 200 gpm per radiators, each consisting of two tube sections,
similar to the existing system. Operating pressure is 60 psig. Size the system to cool incoming 138
degree F water to 109 degree F water. Use 100 degree F ambient temperature for design.

Current radiators are two pass, round tubes. Need to be able once per year to "rode out" tubes as tubes get
clogged from the minerals.

The current radiator core uses inhibited admiralty (brass) tubes with aluminum fins.

Each existing radiator is approximately 157" long x 152" wide. Each radiator consists of 2 - 72" x 144"
cores. The rods are approximately 144" long. The holes in the core header (for the tubes) are 17/32" dia.

The existing tube assemblies have holes drilled in the header plate to 17/32 dia., reamed to .546 +002 / -
000. Countersink 1/32 x 45 degree on tube entry side; approximately 172 required. This appears to be
the OD of the tubes.

Each Radiator is two pass, water in on top, passes thru and then return the bottom of core where it is
collected. Each fan (one per radiator) is driven from below with vertical shaft to top mounted 108"
diameter fan. Existing motor is 15HP, 460 volts, 3-phase, 60 HZ, 1.15 service factor, 1750 rpm, TR
Classs F/B, with TEFC enclosure. Fan Speed is approx 350 RPM

Replace with round admiralty copper tubes, induced draft, with removable covers similar to the existing
system.

Contractor will remove all replaced materials from the park and dispose of the materials in an approved
manner.

In addition to the tube assemblies (four total), contractor shall provide two spare fan motors and 10 spare
end cover gaskets, for future replacement by park service staff.

Contractor shall submit a price and a technical proposal as required by the solicitation. Contractor’s who
fail to submit both the price and technical proposal by the closing date, may be determined nonresponsive.




HOSP 9-12-11                             RADIATOR REQUEST                                  Page 1 of 2
               EXISTING AIR COOLED RADIATOR ASSEMBLY




               REMOVING END PLATES COVERING TUBE ASSEMBLIES




               RADIATOR ASSEMBLY WITH END PLATE REMOVED




HOSP 9-12-11                   RADIATOR REQUEST               Page 2 of 2

								
To top