Airec Cross 30 Installation And Maintenance Manual - Page 3

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Cleaning

The normally high degree of turbulence in the Cross gives a

self-cleaning effect in the liquid channels, which

and the build-up of contamination, which can seriously reduce

heat transfer capacity and increase pressure drop.

Cleaning liquid side

In some applications, the fouling tendency can be very high, for

example with extremely hard water at high temperatures. In

such cases, the Cross can always be cleaned by:

- Circulating a cleaning liquid (CIP – Cleaning In Place).

- A solution of 5% phosphoric acid or 5% oxalic acid in water is

recommended to chemically clean the channels.

- The flow rate of the cleaning liquid should be greater than the

design liquid flow, and the flow should be in the opposite

direction through the heat exchanger relative to the flow in

normal operation.

ATTENTION: After cleaning, it is very important to flush the

heat exchanger thoroughly with clean water before start-up.

Cleaning gas side

Heavy condensation can have a self-cleaning effect, washing the

Cross and reducing dirt build-up on the gas side. The Cross 30

has open gas channels at both ends that can be checked

visually. For dry dirt such as carbon, ashes or dust, most of the

dirt sticks to the inlet surface. Cleaning with compressed air or

high-pressure water up to 200 bar is normally effective.

Exhausts from diesel, vegetable oils or biogas combustion may

require regular cleaning.

For greasy dirt such as oil, a suitable cleaning liquid is

recommended. When using cleaning liquid it is important to

flush the Cross thoroughly with clean water before start-up.

Storage

The Cross must always be stored in a dry and protective

environment. The temperature should not be below 1 °C and

not over 50 °C for long-term storage (more than 4 weeks).

During long operational stand-by periods, the system should be

inspected for contamination on the liquid and gas sides. If

necessary, clean the Cross according to the cleaning

instructions. Liquid sides containing water should be drained.

Warranty

Airec offers

a 12-month warranty from the date of installation,

but in no case longer than 18 months from the date of delivery.

The warranty covers only manufacturing and material defects

(poor workmanship and/or faulty material).

The warranty does not cover damage caused by mechanical

(including fatigue damage due to vibrations/pulsations) and/or

thermal stress.

The warranty does not cover damage caused by corrosion.

The warranty does not cover damages caused by dirt build up

and/or fouling.

For further information please see

www.airec.com/support/download.

reduces fouling

Example of CIP set-up

Disclaimer

The

performance of the

Cross

is based on installation,

maintenance and operating conditions being in conformance

with this manual. Airec cannot assume any liability for Cross

heat exchangers that do not meet these criteria.

For further information, please consult Airec's technical information

or your local Airec representative.

AIREC AB

Hanögatan 5

SE-211 24 Malmö, Sweden

switch: +46 (0)40 93 63 60

[email protected]