Process Heaters



HIGH PRESSURE HEAT EXCHANGERS

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Heat Exchangers - For over 70 years TEi-Struthers Wells has been an industry leader in providing custom designed specialized Shell and Tube Heat Exchangers. Quality and reliability are the trademarks of TEi-Struthers Wells products. TEi-Struthers Wells fabricated the first all welded carbon steel vessel in the United States in 1902, the first all welded stainless steel pressure vessel in 1909, and designed and manufactured its first Shell and Tube heat exchanger in 1922.

High pressure feedwater heater for vertical installation

Breech Lock Closure - In 1968, TEi-Struthers Wells became involved in the design of a special heat exchangers for a major oil company to be used in the Hydrocracking process. TEi-Struthers Wells supplied a number of Heat Exchangers using the basic concept of Breech Lock closure, but later incorporated certain design features which improved the reliability of the closure design.

Channel of a Breech-Lock, pull-thru bundle design

Diaphragm Closure - The diaphragm closure is used in the chemical and petrochemical processes. The advantage is that the gasket seating load is zero (0) thereby reducing the size of the closure bolts. Because the diaphragm plate is seal welded to the channel, any potential leak paths of the channel fluid are eliminated.

Self-Energized Gasket Closure - The self-energized gasket closure may be utilized whenever the design pressure is equal to or greater than 3,000 psi or the diameter of the closure is greater than ninety inches (90”). The self-energized gasket is flexible so that the internal pressure acting against it seals the closure. For this type of gasket, the bolts are designed for the end load. There is no gasket seating load.

Multiwall Construction Shell - In the late 1950’s, to overcome very thick shell rolling limitation TEi-Struthers Wells developed a proprietary laminated shell, called Multiwall construction, for shells of its high pressure Heat Exchangers.

Multiwall shell course after thermal shrink assembly

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High pressure Heat Exchangers in various stages of fabrication

Since that time, we have supplied several thousand Heat Exchangers for essentially every type of application and in virtually every commercially available alloy. Heat Exchangers have been designed for design pressures up to 7,900 psig, design temperatures up to 1600 F, and in sizes up to the maximum shipping limitations

Breech Lock closure exchanger for refinery application

In removable bundle type of this design the internal bolts are used to apply the seating load to the gasket at the tubesheet/shell interface. The pressure end load is absorbed by the threaded closure. The outer row of external bolts applies the seating load to the channel gasket. The inner row of external bolts is used to increase the seating load between the tubesheet and shell gasket in the event of relaxation of the inner bolts

A seal welded Diaphragm closure used for a 3,700 psi, 1,000 F design parameters

High pressure heat exchanger designed for 5,260 psi both shell and tube side. Multiwall shell and seal welded diaphragm channel closure construction are used.

Multiwall vessels are still fabricated for Ammonia Converters and Urea Reactors. Because of the process fluids, the inner layer of these vessels is of an alloy material such as Stainless steel, Titanium, or Zirconium. The Multiwall vessel solves many material and fabrication problems and presents a competitive design when compared to monowall vessels.