Custom built

Shell & Tube Heat Exchanger Bloksma N-type

Custom built

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Cooling or heating issues for which we do not have a standardized heat exchanger can be solved in a custom built shell & tube heat exchanger (known as the N-type). The welded construction allows a flexible design. These special heat exchangers are produced by using as much standardized components as possible.

  • Custom built Bloksma Shell & Tube Heat Exchanger N-type
    Custom built Bloksma Shell & Tube Heat Exchanger N-type
  • Custom built Bloksma Shell & Tube Heat Exchanger N-type
    Custom built Bloksma Shell & Tube Heat Exchanger N-type
  • Custom built Bloksma Shell & Tube Heat Exchanger N-type
    Custom built Bloksma Shell & Tube Heat Exchanger N-type
  • Custom built Bloksma Shell & Tube Heat Exchanger N-type
    Custom built Bloksma Shell & Tube Heat Exchanger N-type

We use small diameter tubes (10 mm) in most special heat exchangers, which means that a large heat exchanging surface can be obtained at relatively small dimensions of the heat exchanger. Of course, larger tube sizes (like 16 mm) are also possible.

The N-type heat exchangers can be designed according to most design codes (for instance TEMA, ASME (incl. U-stamp), API, CE) and are accepted by all main marine classification societies. The tubes are roller expanded (cold-forming) into the tube sheets, which results in excellent connections, as for strength as well as for sealing. Bloksma special shell and tube heat exchangers are built in three main types.

A special model of the BEW and BEM types is the double-tube (safety) heat exchanger, which is applied when it is absolutely unacceptable that both media in the heat exchanger mix in case of leakages (for instance transformer oil and water) or when leakage to the environment should be prevented at all costs.

Depending on the application the double-tube heat exchanger can be equipped with externally finned outer tubes (to enlarge the heat exchanging area) or with plain outer tubes. Inside these tubes are normal plain tubes. Early detection of leakage in case one of the tubes becomes defective is provided by the grooves between the outer and the inner tubes. Well before any harm should occur, the leak detection has become active.

Depending on the design code, the application and on customer request, different materials are being applied. The shell and the water boxes are in general made from carbon steel. When there is a corrosive medium on the tube side, the water boxes are coated on the inside and anodes are mounted. We have very good experiences with coated water boxes. In addition these water boxes are more economical than for instance cast bronze water boxes (which can also be made upon request). Another possibility is a complete stainless steel (AISI 316L) version of a heat exchanger.

The most frequently used materials for tubes and tube sheets are:

Tubes

  • Carbon steel (St 35.8)
  • Aluminium brass (CuZn20Al2)
  • CuNi 90/10 (CuNi10Fe1Mn)
  • CuNi 70/30 (CuNi30Fe1Mn)
  • AISI 316L (X2CrNiMo 17.13.2)
  • Titanium


Tube sheets

  • Carbon steel (H-II)
  • Muntz metal (CuZn38SnAl)
  • CuNi 90/10 (CuNi10Fe1Mn)
  • CuNi 70/30 (CuNi30Fe1Mn)
  • AISI 316L (X2CrNiMo 17.13.2)
  • Titanium


The tubes are roller expanded into the tube sheets. In case of thermal oil for instance the tubes are additionally seal-welded. This limits the material combinations of tubes and tube sheets. In case of strong corrosive media it is possible to apply a coating to the inside of the tube bundle (with of course a negative effect on the heat exchange).

Design
Flanges: DIN 86030 / PN 16 (when necessary PN 40 or higher). Depending on the design code and on customer request it is also possible to use other flanges like ANSI or JIS. Design pressure 1 bar up to max. appr. 50 bar. Design temperature max. appr. 400 ƒC.

Functions
You will find Bloksma shell & tube heat exchangers in, on or at for instance:

  • Oil cooling or heating
  • Water cooling
  • Butterworth heater
  • Intermediate heater
  • Dump cooler / condenser
  • Glandsteam condenser
  • Environmental (double-tube)
  • Safety (double-tube)
  • Air or gas cooling
  • Heat recovery
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