What is heat exchanger maintenance ?

The heat exchanger maintenance consists in cleaning the bundle of inner tubes and the outer cleaning of the cloak.

The maintenance procedure is carried out in three phases:

  1. tube bundle extraction
  2. tube bundle transport
  3. bundle cleaning
  4. tube insert

What is a heat exchanger ?

A heat exchanger is an apparatus where the exchange of heat energy occurs between two different fluids at different temperatures.
The most used  is what is known as “tubular beam and cloak exchanger“, as its large surface structure allows to exchange large quantities of heat.
This type of exchanger has a cylindrical shape, formed by a container called the mantle, where a bundle of tubes passes through each of them, both of which are crossed by the fluids.

The most common malfunction is called Fouling.

heat exchanger maintenance heat exchanger maintenance

Fouling is the deposit of solid material inside the pipes, transported by fluids or precipitation products such as limestone, this clogging of the pipes leads to a reduction in the heat transfer coefficient and in conclusion a worse performance of the exchanger itself.

What to do?

Periodically maintain a heat exchanger maintenance.

1 – Tube bundle extraction procedure

The bundle extractor or bundle puller consists in extracting the exchanger from its shell through the
Ad hoc machines, called aerial tube bundle extractor having a variable pull power, depending on the size of the exchanger itself.

heat exchanger extraction

2 – Tube bundle transport procedure

The tube bundle transport procedure can be carried out in two different ways, depending on the height where the exchanger is located.
For large heights the transport will be carried out first by using cranes and later with ad hoc called straddle carrier cars, for lower heights it would be enough to use truck mounted or self propelled.

Click on it fo more information about bundle transport

self propelled

self propelled

straddle carrier

straddle carrier

truck mounted

truck mounted

3 – Tube bundle cleaning procedure

The cleaning process of the tube bundles consists of the pulp of the same thanks to robots that wash away the deposits both internally and externally, through high pressure jet jets.

Click on it fo more information about bundle cleaning

4 – Tube insertion procedure

The insertion of the bundle consists in re-inserting the exchanger into its own shell through the aerial bundle extractor  themselves after the cleaning phase.

What is the Bundle Extractor Procedure ?

The Bundle Extractor or bundle puller procedure is the first phase of one of the four processes for maintaining the heat exchanger, which has as its purpose the output of the tube bundle from its shell.

This first step is done by means of ad hoc machines called tube bundle extractors.

Idrojet srl. has designed different types of extractors those equipped with cranes called aerial bundle extractors and those without these truck mounted, both for the same purpose but used for different cases based on the location of the heat exchanger.

For heights above 7 mt, the bundle puller used are airplanes, and by means of an extruder crane are positioned to the desired height.

aerial bundle extractor

Less than 7 meters long, Idrojet srl  has produced self-propelled and truck mounted  which allow not only to extract the tube bundle without the use of any external crane, but to transport it autonomously by avoiding the use of the straddle carrier, saving so much time and money, so a single car for the first and second stages.

Tube bundle Insertion last step

The first step and last step, is the insertion, are carried out with the same bundle extractors.

Below an example of heat exchanger maintance where tube bundle insertion after the heat exchanger cleaning procedure … watch it below.

If you want rental the bundle extractor visit www.idmitaly.com