Warranty; Spare Parts; Ce Marking Documentation; Notes On Zinc Anodes - BOWMAN EC Series Installation, Operation, Maintenance Manual

7. Warranty

All BOWMAN® Hydraulic Oil Coolers are guaranteed against manufacturing and material defects for
a period of twelve months from the date of delivery.
BOWMAN® should be contacted immediately if a unit is received damaged. No attempt should be
made to repair a faulty unit as this will invalidate the warranty.
For full warranty terms, please see the BOWMAN® Conditions of Sale. A copy of which is available on
www.ej-bowman.com
request or via download from the website:
8. Spare Parts List
A comprehensive stock of spare parts is always available. Details are given in the Hydraulic Oil Coolers
www.ej-bowman.com/downloads
brochure which can be downloaded from:
Please contact our sales department for price and availability or nearest stockist
.

9. CE Marking Documentation

Heat exchangers are covered by the Pressure Equipment Directive 97/23/EC which is mandatory for all
EU member states.. This manual is part of the compliance and points out all essential safety requirements
to be observed.
BOWMAN®
Hydraulic Oil Coolers fall within the Sound Engineering Practice category of the Pressure
Equipment Directive 2014/68/EU and as such cannot be CE marked.

10. Notes on Zinc Anodes

The use of zinc anodes in heat exchangers has been employed for some years, generally by manufacturers
using admiralty brass tube or its variants. The purpose of the zinc anode, or zinc pencil as it is sometimes called,
is to prevent dezincification of the brass alloy tubes. As such zinc anode acts sacrificially in favour of the tube.
There are a number of American and European manufacturers that use these anodes in their products.
BOWMAN®
, do not fit zinc anodes as the tubes used in the construction of our coolers are of copper nickel
alloy and as such do not require a zinc anode. It is possible that if this anode is fitted it can actually destroy the
copper oxide film built up by the tube as a natural defence which can allow the tube material to be attacked.
It is usual with the copper nickel alloys to use an iron anode which allows an iron oxide film to build up
inside the tube which breaks down as a sacrificial element reducing the possibility of corrosion to the heat
BOWMAN®
exchanger. In designs it is not practical to fit iron anodes as their size has to be very generous.
Therefore as an alternative a piece of black iron pipework can be placed before the heat exchanger which in
itself acts as sacrificial element protecting the cooler. The Royal Navy has often used this technique and when
the black iron pipework corrodes, it is simply replace with a fresh piece.
We do know that some manufacturers of oil coolers, mostly those that are copies of better known products,
often fit zinc anodes with copper nickel alloys in error.
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