SECTION 033000 - CAST-IN-PLACE CONCRETE

Sludge Treatment Project Engineered Container Retrieval and Transfer System January 2012
40. Heater elements mounted externally shall not come into direct contact with desiccant bed.
This design minimizes thermal shock, scorching and premature aging of desiccant caused
by internally mounted heater elements.
41. Heater shall be sized for complete regeneration air requirement. To maximize heater
element service life, the heater shall be operated by a solid state relay with a set
temperature of 375 deg F. Heater watt density shall not exceed 23 watts per square inch.
The heater shall be Incoloy sheathed and insulated.
42. Externally mounted heater design shall reduce the potential for a compressed air line fire
common to internal heater-type designs. Heater assembly shall include direct monitoring
of the heater housing. A thermocouple shall measure the internal heater housing
temperature and shut-down the heater upon High Heater Temperature condition.
Interlock shall be included to prevent heater from re-energizing without being manually
reset.
43. A temperature gauge mounted on each dryer tower shall act as a visual indicator that
tower regeneration is occurring.
44. All electrical equipment and components shall conform to the latest edition of the
National Electrical Code (NEC) and the National Electrical Manufacturers Association
(NEMA).
45. Drying system shall be designed so that single entry, 480V/3PH/60HZ electrical power
can be brought into control enclosure.
46. Electrical Characteristics:
a. Volts: 480 Vac.
b. Phase(s): Three.
c. Hertz: 60 Hz.
d. Full-Load Amperes: Determined by Seller.
e. Minimum Circuit Ampacity: Determined by Seller.
f. Maximum Overcurrent Protection: Determined by Seller.
2.5 COMPUTER INTERFACE CABINET
A. Description:
1. Wall mounting.
2. Welded steel with white enamel finish.
3. Gasketed door.
4. Grounding device.
5. Factory-installed, signal circuit boards.
6. Power transformer.
7. Circuit breaker.
8. Wiring terminal board.
9. Internal wiring capable of interfacing 5 alarm signals.
2.6 MOTORS
A. Comply with NEMA designation, temperature rating, service factor, enclosure type, and
efficiency requirements for motors specified in Division 23 Section 230513 "Common Motor
Requirements for HVAC Equipment."
Contract 44577 KW Annex – Rev. E 44577-CSI-SPEC-001 221519 - 10