Specifications: Heat Transfer Unit Pilot or Pneumatic operation (HTU)


Furnish and install one EnviroSep Model HTU - [A] - [B] - [C] - [D] - [E] - [F] Heat Transfer Unit with unit capacity to heat ____ gpm from _____ oF to _____ oF when ______ psig steam is available at the factory installed, Steam Control Valve.

KEY:

[A] = System Flow Rate (gpm)
[B] = Inlet Temperature (oF )
[C] = Outlet Temperature (oF )
[D] = Steam Pressure at Control Valve
[E] = Pressure Drop (psid)
[F] = Fouling Factor

GENERAL - This unit shall be factory assembled with steam control valve, steam trap, shell and tube heat exchanger, fabricated steel frame, interconnection piping (welded per ASME Section IX certified welders), UL-listed Industrial Control Panel factory wired for single-point field connection per NEC, ( if required).

HEAT EXCHANGER - Heat exchanger shall be shell and tube type with removable tube bundle. Shell is carbon steel with cast iron heads and tube sheets. Tubes are 3/4" OD copper. Unit is rated for 150 psig at 375 oF. Shell-side connections 4" and larger are 150 lb. ANSI flanges and all 3" and smaller are NPT connection. Unit shall carry U-1 form and have ASME stamp for 150 psig operation.

FLOAT & THERMOSTATIC STEAM TRAP - Steam trap shall be of the mechanical ball float type with cast iron body, NPT connections, and all stainless steel internals. A stainless steel balanced pressure thermostatic air vent shall be incorporated into the trap body withstanding 45 oF of superheat and resisting waterhammer without sustaining damage. Internals shall be serviceable without disturbing piping.

INVERTED BUCKET STEAM TRAP - Steam trap shall be of the mechanical inverted bucket type with cast iron body, screwed NPT horizontal connections and stainless steel valve head and seat. An internal bi-metal air vent shall be included.

PILOT-OPERATED STEAM CONTROL VALVE - The control valve shall be pilot-actuated, diaphragm-operated, and shall be single-seated, with hardened stainless steel trim and cast iron body. The pilot shall be bolted directly to the valve body and shall be removable without disturbing control connections. The temperature setting shall be adjustable and indicated on a calibrated dial. Temperature sensor shall be solid fill.

PNEUMATIC- OPERATED STEAM CONTROL VALVE - The control valve shall be pneumatically actuated with valve body constructed of cast iron and having stainless steel plug, seat, and stem. The pneumatic actuator shall be of the spring-closed design and shall have a fabric reinforced nitrile rubber diaphragm. Actuator yoke shall incorporate electro-pneumatic, intrinsically safe positioner requiring a 4-20 ma input signal, and compressed air connection for valve operation. The positioner shall compare the electrical signal from a controller with the valve position feedback to overcome varying differential pressure, stem friction, and diaphragm hysterisis.

MANUFACTURER - Shall assume system liability, and performance guarantee and warranty all equipment on system for 12 months after initial start-up.