Hubbell MSH - Manual (Page 8)

8
Optional Steam Package
8
Benefit Of Dual Fuel Capability
The Hubbell model MSH and MH water heater is available
with a factory installed heat exchanger to provide heating
capability utilizing ships steam or boiler water. While the
ship is under way and the boilers are producing steam,
the water heater will operate in “primary” mode and use
steam to heat the water. When the ship is dockside, and
steam generation is reduced (or completely shut down), the
operator can switch the water heater over to electric heating
mode by simply turning a switch on the Hubbell control panel
which activates the factory packaged and installed electric
immersion heaters. This dual fuel capability provides ship
operators with complete flexibility in determining which fuel
mode is most advantageous to operate at any given time.
Electric
Control Panel
Electric
Heater
Steam Heating
Coil (steam
controls not
shown)
Standard Features
Steam Heating Coil
1. A high quality factory installed 2 pass U-Tube heating
coil constructed from 18 BWG 3 /
4
" O.D. single wall
copper tubing designed for a maximum working
pressure of 150 psi.
2. All wetted parts including the tube sheet and baffles
are non-ferrous for maximum longevity.
3. Heavy duty fabricated steel head with threaded NPT
steam and condensate connections.
Optional Features
Optional vessel construction and optional general
construction features as shown on page 3.
Steam Heating Coil
1. Double wall tubing with a leak detection port
2. Alternate tubing material please specify:
(Stainless Steel, 90/10 Copper-Nickel, Other)
3. Fabricated steam head constructed from:
(Stainless Steel, Copper Alloy, Other)
Operating Controls
4. Steam controls are factory selected and sized, but
shipped loose for in the field installation by others.
5. Various steam control valves are available to meet
the specific needs of your application, please
specify: Self-operated type, pneumatic operated,
electric motor operated, separate pressure
reducing pilot type.
6. Single solenoid safety system closes the control
valve should the water temperature in the tank
reach the hi-limit set point. Requires 120 volt 5
amp electrical service.
7. A double solenoid safety system dumps over
heated water in the storage tank to drain in
addition to closing the control valve. Requires 120
volt 5 amp electrical service.
8. Dial water thermometer and pressure gauge
factory installed in the tank.
9. Factory wrapped and baffled steam coil with
integral pump package.
10. Steam Controls to be cast steel construction.
Steam Operating Controls
1. Steam operating controls are factory selected, sized,
piped, and tested to ensure reliable operation.
2. All steam components are factory plumbed with
schedule 40 black iron pipe and ready for steam and
condensate connections.
3. High quality cast iron pilot operated steam control
valve modulates the flow of steam through the
heating coil to provide accurate water temperature
control.
4. Cast iron Y strainer with 20 Mesh screen protects the
steam controls and coil from dirt and debris in the
steam supply.
5. Thermostatic drip trap removes condensate from the
steam supply line.
6. Heavy duty cast iron float and thermostatic main
condensate trap for optimum efficiency.
7. Brass vacuum breaker and dial steam pressure
gauge installed in the heating coil head.
Note: Additional steam and boiler water design literature
is available in Hubbell brochures titled “ST”,“BW” and
“Heating Coils”.
Marine Products Division