R.W. Holland's Tank Heating Coils are fabricated with fintubes having the 
orientation of the fin in the direction of the convection currents in the tank.  
When the fluid next to the fintube is heated it rises rapidly due to the lower 
density.  The colder fluid at the top of the tank falls to the bottom, creating 
a thermosyphon action in the tank.  

     Providing tank heating coils with the fins longitudinally for vertical coils
and helically for horizontal coils is the most effective heat transfer surface
because the fluid rising vertically passes between the fins, not across the fins.

     Since Holland Tank Heating Coils are supported off the tank floor and tank 
fluid is kept in motion by the thermosyphon effect, sediment remains in 
suspension and the heating coils, tank walls and the floor are kept clean.
    

BAYONET COILS (Horizontal)

• Direct connection to tank mounting flange.
• All connections outside of tank.
• Helical fintubes oriented in direction of thermosyphon flow.

HORIZONTAL COILS

(For tanks with low liquid levels)

• Parallel flow for steam heating.
• Series flow for hot oil/heat transfer fluid heating.

VERTICAL COILS

• Vertical design gives best thermosyphon flow in tank and most efficient heat transfer.
• Off-floor design allows for easier cleaning of tank.

• Cooling by natural convection with fintubes.
• Custom design.
• Fintubes utilize continuous welded helical fintubes.
• No power required.
• Smaller service duty.

Return to R.W Holland Home Page