Rotary Drum Dryer

Shell and Tube Heat Exchangers

NSI Equipments Private Limited manufactures various types of Shell and Tube Heat Exchangers also known as Shell and Tube Condensers from standard fixed tube shell type to floating head or "U" tube bundle to suit different process conditions with strict quality assurance and in full compliance with international code and code like ASME sec. VIII and TEMA.

Standard Types of Shell and Tube Heat Exchangers :

Fixed Tube Heat Exchangers
This type is commonly used than any other type. The tube plates are welded to the shell and serve as flanges to which the channels and covers are bolted and there is no limitation on the number of tube side passes. The tube bores can be cleaned mechanically or chemically but the outside tube surface are inaccessible except to chemical cleaning.

U Tube Heat Exchangers
The tube bundle consists of stationary type plate U-tubes baffles, tie rods and spacer. The thermal expansion is absorbed by the U-bends. Tube bundle can be removed from the shell for cleaning or maintenance but internal cleaning is difficult and it is applied where the tube side fluids are clean.

Floating Head Heat Exchangers
Suitable to rigorous duties. The tube bundle consists of straight tubes expanded on to tube plates of each end. The floating head is fitted to the tube plate remote from the channel and the cover is held in position by a split backing ring. The tube bundle is easily removed for cleaning or maintenance.

Packed Gland Floating Head Heat Exchangers :
The shell and tube side fluids are separated at the floating head end by a circular lantern ring which fits round the floating tube plate and is packed by two glands, one on the tube side and one on the shell side. The lantern ring is grooved on the inside face and drilled radically with vent holes, thus leakage from either gland is apparent from outside inspection and the fluids are prevented from mixing, since they can leak to waste and not in to one another.. the tube bundle can be withdrawn for cleaning and tube replacement is simple. The presence of the packed gland in this construction makes it unsuitable for volatile or toxic fluids.

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Rotary Drum Flaker

Shell and Tube Heat Exchangers