Feature 1
Final airless spray appearance of Hempadur
35560 applied in a ship potable water tank
(Credit: Hempel AS).
(100% solids) or solvent-borne.
Before accepting a coating to be used
in potable water tanks, classification
societies require certification from a
recognised laboratory that the coating
is suitable for prolonged contact with
drinking water. Most epoxy coatings,
if properly formulated, will pass
these test criteria. There are usually
no significant differences between
solvent-borne and solvent-free coatings
during laboratory testing, but solvent
entrapment may play an important role
under field conditions. If ventilation is
not carefully monitored during drying
the solvents in solvent-borne potable
water coatings can become retained
in the coating. Therefore, solvent-free
•
easy to apply and clean; pipes, by the American Water Works
coatings are better suited for potable
•
light in colour, making inspection Association (AWWA) to meet ANSI/
water tanks than those containing easy; and AWWA standard C210-07 for interior
solvents. However, most solvent-free
•
long-lasting, requiring only a steel water pipelines, by Australian
coatings on the market are difficult to minimum of maintenance Water Quality Centre to meet
apply with ordinary airless equipment, requirements for use in drinking water
which has led to some coating failures Other solvent-free epoxy coatings tanks and pipelines and also national
in the past due to inappropriate use of are not that easy to apply, requiring approvals in Portugal and Italy for use
thinners by contractors. For this reason, special paint application equipment, or in onshore potable water tanks.
most shipyards in Europe today prefer heating of the paint. Hempadur 35560 Feedback from recent applications
solvent-borne coating systems for is formulated for easy application with of Hempadur 35560 in cold climate in
potable water tanks since they are easier standard airless spray equipment and potable water tanks at Ulstein Shipyard
to apply than solvent-free systems and has no need for heating or thinning in Ulsteinvik in Norway, Odense Steel
provide satisfactory performance when even when applying at temperatures Shipyard at Lindøe, Denmark, and in
the tank coating is carried out according down to 10°C. warm climate in water pipes for Erciyas
to appropriate procedure. Since it is formulated without Pipe at Kayseri, Turkey, have been very
The most important thing is that the solvents, Hempadur 35560 does not positive. The paint applicators using
water has to be safe to drink, and it affect the environment, the quality of standard airless spray equipment are
should come without surprising taste or the water, or add smell and taste. It very pleased with the application
smell. Hempel’s new Hempadur 35560 provides excellent corrosion resistance properties of Hempadur 35560. Since
coating is ideal for potable drinking and cathodic protection to prevent rust Hempadur 35560 was launched in the
water and pipelines. It avoids any contamination, and Hempadur 35560 market, potable water tanks onboard
chemical taste or odour since it is 100% requires minimal maintenance for up close to 100 vessels ranging from small
free of solvents and benzyl alcohol. This to 25 years. tugs, platform supply ships, cargo ships,
also makes it environmentally friendly. Hempadur 35560 is already passenger/ro-ro ships to large cruise
Its other practical advantage is that it is approved by UK’s Water Research ships, tankers, container and large
application friendly. Centre (WRAS) according to BS 6920 bulk carriers have been coated with the
Hempadur 35560 features and for potable water up to 23°C/73°F, product to give safe drinking water to
benefits: by Norway’s Folkehelseinstituttet crew and passengers.
•
certified for use with potable water; (Norwegian Institute of Public Health), Normand Seven built at Ulstein Yard
•
100% free of solvents and benzyl for use in offshore potable water in Norway is an offshore pipe-layer
alcohol; tanks and pipes, by the US National vessel voted ‘Ship of the Year’ in 2007
•
resists corrosion and bacterial Sanitation Foundation (NSF) to meet and operates in the Norwegian part of
growth; NSF standard 61 for use in tanks and the North Sea. OMT
Offshore Marine Technology 1st Quarter 2010 21
Eco friendly coatings.indd 21 27/01/2010 12:01:39
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36