SSG No 20 - Shipgaz

technical news
Editor: Robert Hermansson ~ Phone: +46 40 15 61 44 ~ E-mail: robert@shipgaz.com
New temperature control valve
Amot has recently introduced the improved
version of the G temperature control valve.
The updated G valve gives optimal matching
to the installation piping and is well
suited for both mixing and diverting applications.
It is mainly used for fluid temperature
control in large diesel and gas engines
for purposes such as oil temperature control,
jacket water cooling, charge air temperature
control etc. The valve has a very low
weight and offers rapid and accurate regulations
of temperatures up to 100° C with
flow rates of maximum 3,000 cbm/hr.
Among the accessories is the new
8071/2D PID controller, that incorporates
temperature dead band, remote alarms and
logic outputs to drive 25A solid state relays
and the advanced 8060 temperature sensor.
For more information please contact:
Paula Halpin, Tel. +44 (0)1737 222 552
E-mail: info@amot.com
www.amot.com
Solvent-free coating
for potable water
Water must be clean, safe to drink and
without surprising taste or smell. Hempel’s
new Hempadur 3556 coating is free of
solvents and benzyl alcohol, thus has no
chemical taste or odour. It provides excellent
corrosion resistance and cathodic protection
and needs minimal maintenance
for up to 25 years. Most of the solvent-free
epoxy coatings on the market require special
paint application equipment or heating.
Hempadur 3556 is formulated for
easy application and there is no need for
heating or thinning even when the paint is
applied at temperatures as low as 10°C.
Hempadur 3556 is a two-component
polyamine adduct cured epoxy coating. It is
approved by Great Britain’s Water Research
Centre, WRAS, according to BS 6920 for
potable water up to 23°C, by Norway’s
Folkehelseinstituttet for use in offshore
potable water tanks and is currently undergoing
US testing to meet NSF standard 61.
For more information please contact:
Michael Aamodt, tel. +45 4527 3673
Mob. +45 2427 0931
E-mail: mia@dk.hempel.com
www.hempel.com
Upgraded engines
from Wärtsilä
Wärtsilä has introduced a new D-version of
the RT-flex50 low speed engine. Compared
to the B-version the new engine has higher
power rating and lower fuel consumption.
The maximum power output has been
raised by 5.1 per cent, from 1,660 to 1,745
kW/cylinder. The running speed is still 124
rpm. Engines with five to eight cylinders
will cover a power range of 6,100–13,960
kW at 99–124 rpm.
Lower fuel consumption
The brake specific fuel consumptions,
BSFC, have been reduced by 2 g/kWh. At
full load this is equivalent to a reduction
from 171 to 169 g/kWh. The lower fuel
consumption is made possible thanks to
high efficiency turbochargers.
The RT-flex50 incorporates the latest
electronically controlled common-rail
technology for fuel injection and valve
actuation. The new technology gives a
great flexibility in engine setting and
benefits such as lower fuel consumptions,
lower minimum running speeds, smokeless
operation at all running speeds and also
better control of exhaust emissions.
Annex VI compliant
As in the older version the bore is 500
mm and the piston stroke 2050. The mean
effective pressure is 21 bar in the new
engine compared to 20 in the older one.
As with all new marine engines, the RTflex50
is fully compliant with the NOx
emission regulation of Annex VI of the
Marpol 1973/78 convention.
For more information please contact:
Lars Andersson, tel. +41 52 26 222 30
E-mail: lars.andersson@wartsila.com
www.wartsila.com
Key pArAmeters of rt-fLex50 mArIne dIeseL engInes
engine version B d
Cylinder bore 500 500 mm
Piston stroke 2,050 2,050 mm
Stroke/bore ratio 4.1 4.1
Power, R1 MCR 1,660 1,745 kW/cylinder
2,260 2,375 bhp/cylinder
Speed range, R1 124 124 rev/min
Mean effective pressure at R1 20.0 21.0 bar
Mean piston speed at R1 8.5 8.5 m/s
Numbers of cylinders 5 to 8 5–8
Power range 5,800–13,280 6,100–13,960 kW
7,900–18,080 8,300–19,000 bhp
BSFC at full-load R1 rating 171 169 g/kWh
126 124 g/bhph
74 SCANDINAVIAN SHIPPING GAZETTE • OCTOBER 26, 2007