DEEPWELL CARGO PUMPS
FOR GAS CARRIERS
PUMPING EFFICIENCY
INTO CARGO
OPERATIONS
Wärtsilä is the undisputed leader in
gas carrier pump technology. Our
deepwell cargo pumps can handle
all cargoes including LPG, LNG,
ammonia, ethane and ethylene. 90%
of the world’s LPG fleet depends on
Wärtsilä Svanehøj deepwell cargo
pump technology. With such a depth
of experience across vessel and cargo
types, we are the natural choice
for high quality, safe and reliable
systems with strong environmental
performance that offer excellent
lifetime value and complete peace of
mind.
When absolute confidence in offloading
safety and efficiency are critical,
Wärtsilä Svanehøj is the natural choice
among gas carriers worldwide for
deepwell and cargo booster pumps.
Our dedicated project teams deliver
solutions for vessels from the smallest
fully pressurized push barges and
dedicated CO2 carriers to the largest
fully refrigerated VLGCs, FLNG’s and
FRSU’s.
Our pumps handle all types of cargo
at all temperatures and specific gravities
without any component changes,
offering potentially huge cost savings.
Our range spans:
• Fully pressurised tankers, cargo at ambient temperature, tank pressure up to 18 bar.
• Fully refrigerated atmospheric tankers, cargo cooled to saturation temperature
(typically -48°C - 88°C).
• Semi-refrigerated tankers, cargo liquefied by cooling/pressure process down to -104°C.
• We lead in long-shafted pumps for LNG at -163°C.
DEEPWELL CARGO
PUMPS
• Wärtsilä Svanehøj deepwell cargo pumps are used for offloading liquid gas on gas carriers and barges up to 100,000 m3.
• On-deck electric motors.
• Each pump optimised to the duty point by trimmed impellers or variable speed drives.
• All stainless steel components in gas tank.
• 4,000+ pumps installed on more than 1,000 ships – lifetime-of-the-
ship reliability.
350
300
100
50
0
0
DW250
DW200
DW150
DW125
DW80
150
DW132
200
DW300
250
DW100
• Maintenance and repair of bearings and shaft seals even with cargo in the tank.
CAPACITY RANGE
Head (m)
• Our flexible pump solutions are designed to handle various cargo types with a wide span in temperature and specific gravity. There is no need for time consuming adaptions of the pump or replacement of seals and bearings, which is sometimes the case for other pump types.
100
200
300
400
Please note that the above curves are valid
for any gas type, but the pumps have a
maximum design pressure of 18 Barg.
500
600
700
800
900
1000
1100
Q (m /h)
3
AN UNRIVALLED MIX OF ADVANTAGES
PROVEN RELIABILITY
Our pump technology that has been in
service for over 40 years.
CONFIDENCE
A large part of the world’s fleet equipped
with Wärtsilä pump systems.
STATE-OF-THE-ART SEALING SYSTEM
Works on cargo tank pressure; no
nitrogen/compressed air connections.
HIGH QUALITY
Systems designed around individual
customer needs, rigorously tested and
engineered to the highest standards.
HIGH LEVELS OF SAFETY
Double mechanical seals mounted backto-back in oil bath prevents leaks in the
unlikely event of seal failure.
WIDE RANGE
One of the widest ranges of references
for all vessel applications.
LIFECYCLE SUPPORT
World leading technical support; spares
and available throughout the lifetime of
the vessel.
ON-TIME DELIVERY
Highest standards of on-time delivery
consistency.
SHAFT SEALING
ARRANGEMENT
(a)
1. Pressure gauge
-seal chamber pressure
2. Level indicator
The shaft sealing arrangement is based on the
principle of communicating vessels. By adding
the force of a spring into the equation we
ensure that the pressure in the sealing system
is always higher than the tank pressure, thereby
preventing cargo leakages.
3. Pressure booster
10. Oil Inlet
1. PRESSURE GAUGES
The system is equipped with 2 pressure gauges.
a) Indicates the pressure in the cargo tank.
b) Indicates the pressure in the sealing oil chamber, this pressure will always be higher than the cargo tank pressure.
9. Sealing oil chamber
4. Cargo tank pressure
2. LEVEL INDICATOR
The piston inside the sight glass follows the
movement of the spring and thereby indicates
the oil level in the sealing system. Can be
delivered with low oil level switch for remote
alarm.
5. Double mechanical seal
6. Static seal
7. Leak oil collection
chamber - lower seal
3. PRESSURE BOOSTER
Fully automatic system where the sealing oil is
put under pressure from both the cargo tank
and the spring. This ensures that the pressure
within the sealing chamber is always higher than
in the cargo tank.
4. CARGO TANK PRESSURE
Through this pipe the cargo tank pressure
(vapour pressure) is added directly to the spring
house.
5. DOUBLE MECHANICAL SEALS
Back to back mechanical seals lubricated by
pressurised sealing oil.
6. STATIC SEAL
Used only for maintenance purposes. The shaft
can be lowered to a point where the static seal
completely seals of the cargo hence making it
possible to do maintenance, such as changing
the mechanical seals, even with a full cargo
tank.
7. LEAK OIL COLLECTION CHAMBER
In the event of a damaged lower mechanical
seal the collection chamber will be able to
obtain all the sealing oil in the system so that
none of it contaminates the cargo. The leaked
oil can be drained from the chamber through the
lower valve.
8. LEAK OIL OUTLET
Sealing oil “bleeding” from this pipe indicates
that the upper sealing may be damaged and
needs to be changed.
9. SEALING OIL CHAMBER
The chamber is air cooled, which needs a large
surface, an aluminum block has been fitted into
the chamber to reduce the inside volume so it
does not exceed the volume in the collection
chamber. The sealing oil is constantly circulated
during pump operation by a helical ridge on the
shaft.
10. OIL INLET
Filling of sealing oil will load the spring and
thereby increase pressure. The inlet is equipped
with quick coupling for easy filling and refilling
of sealing oil by a special Svanehøj manually
operated pump. One pump per ship set is
included.
(b)
8. Leak oil outlet
- upper seal
NMB BOOSTER PUMPS
• Typical Applications: The NMB series of pumps acts as boosters, to increase discharging pressure when offloading lighter cargoes, i.e. low specific gravity cargoes.
• Capacities up to 1,200m3/h at up to 180 mlc - the ideal choice for liquid gas where a booster is required. • Designed for liquid gas installed on fully and semi pressurised as well as fully and semi refrigerated carriers.
• Fully stainless steel pump mounted on a skid with electrical motor.
• Flexible spacer coupling and monitored pressurised shaft seal arrangement.
• Booster pumps are also available in an inline vertical version, NIPB.
EXPERIENCE AND RECENT SUCCESSES
84,000 m3 LPG CARRIER (VLGC)
7,500 m3 LNG/MULTI GAS CARRIER
35,000 m3 LPG MEDIUM GAS CARRIERS
Fully Refrigerated
Semi Refrigerated
Fully Refrigerated
Design temperature: -52°C
Design temperature: -163°C
Design temperature: -104°C
Tank type: prismatic, type ‘A’ tank
Tank type: cylindrical, type ‘C’ tank
Tank type: cylindrical bi-lobe, type ‘C’ tank
Cargo: LPG
Cargo: LNG/LEG/LPG NH3/VCM
Cargo: LPG/LEG/NH3/VCM
Scope of supply: 8 x Wärtsilä Svanehøj
deepwell cargo pumps of 600 m3/h @
120 mLC, 2 x Wärtsilä Svanehøj booster
pumps of 600 m3/h @ 115 mLC.
Scope of supply: 2 x Wärtsilä Svanehøj
deepwell cargo pumps of 450 m3/h @ 210
mLC, 1 x Wärtsilä Svanehøj booster pump
450 m3/h @ 120 mLC.
Scope of supply: 6 x Wärtsilä Svanehøj deepwell cargo pumps of 550 m3/h @ 120 mLC, 2 x Wärtsilä Svanehøj booster pumps 550 m3/h @
120 mLC.
We know that in order to maintain optimized
efficiency and pump performance, our
proximity and responsiveness are essential
elements in your pump solution. That is
why we deliver after sales support through
our network of service centres in over 70
countries worldwide. Our global network of
sales and service centres ensures that we
can provide first class technical spares and
service support to our customers wherever
they may be located.
EXPERT ADVICE IS PRICELESS
Furthermore, a Wärtsilä solution equals service and support throughout the lifecycle
of your installations and is not only confined
to yearly inspections and performance tests.
Service and support may also include basic
support, installation and commissioning,
performance optimization, upgrades and
conversions, as well as service projects and
agreements. Also, our spare part packages
can include start up, two year spare parts,
and capital spare parts.
WÄRTSILÄ® is a registered trademark. Copyright © 2014 Wärtsilä Corporation.
Specifications are subject to change without prior notice.
Wärtsilä Svanehøj A/S
[email protected]
WARTSILA.COM
At Wärtsilä Svanehøj you will be working with
first-class designers of deepwell cargo
pumps. We have the expertise, know-how,
and experience within the industry and are
not at least a production facility which is
100% dedicated to deepwell pumps.
We offer expert advice on your next
deepwell cargo pump investment and will
make sure that you end up with the most
advantageous layout for your operations. Our
many years of experience and numerous
renowned references are your guarantee that
we deliver our promises on deepwell cargo
pumps.
Printed 08/2014 CA
AT YOUR SERVICE