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Tubing, also known as inner tubing, bumper tubing, towed tubing, biscuiting (in New Zealand), or kite tubing, is a recreational activity where an individual rides on top of an inner tube, either on water, snow, or through the air. The tubes themselves are also known as "donuts" or "biscuits" due to their shape.
Marine intercoolers take the form of a tubular heat exchanger with the air passing around a series of tubes within the cooler casing, and sea water circulating inside the tubes. The main materials used for this kind of application are meant to resist sea water corrosion: Copper-Nickel for the tubes and bronze for the sea water covers.
Tube weight was reduced by 31% when copper tube diameters were downsized from 3/8 inch to 7 mm. Tube weight was reduced by 46% when copper tube diameters were downsized from 3/8 inch to 5 mm. The weights of the fin materials in the coils was 3.55 kg for the 9.52 mm coils, 2.61 kg for the 7 mm coils, and 1.55 kg for the 5 mm coils.
The inner surface of the tube, including all joints must be smooth to aid in the flow and removal of condensate. Corrugated or ribbed tubes and rough interior joints must not be used. Joints connecting the tubes together must be tight enough to prevent water or gas infiltration.
Recuperative multi-tube coolers essentially exist of a turning rotor which is mostly driven via chain. At the ends of the rotor are stiff cases for product feed and outlet. The rotor is supported on running treads, as it is typical for rotary drums. The interior of the rotor exists of several tubes in a revolvertype (or planetary) arrangement.
However, building operators must adhere to, and practice correct disinfection procedures before restarting any cooling towers which remained dormant during cooler days when deep water source cooling was able to meet the building's cooling demand. Depending on the needs and on the water temperature, couple heating and cooling can be considered.