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Transcript of Reciprocating Compressors
T H O M A S S E NC O M P R E S S I O N
S Y S T E M S
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Research & Development
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3m o r e t h a n o n e h u n d r e d y e a r s o f
n for Compression
Our founder, Mr Thomassen, first started producing
internal combustion engines more than a hundred
years ago. He soon extended his activities to
include the design and manufacture of reciprocating
compressors. What began as a small, local company
has grown into a major international compressor
supplier, capable of providing world-wide sales and
Our customers, who are located around the globe,
are engaged in the oil, gas, chemical and refining
industries. Exports currently account for more
than 80% of sales.
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Thomassen has an esta-
blished reputation for
providing quality, tailor-
made compression solu-
tions to the oil, gas,
chemical and refining
industries. Our in-depth
knowledge of field pro-
cesses and compressor-related systems enables us to
design, install, maintain and repair all types of recipro-
cating and other compression systems. Moreover, our
broad experience enables us to meet the most
R e c i p r o c a t i n g c o m p r e s s o r s .
Thomassens heavy-duty reciprocating compressors
have the following design features:
Easy access, facilitating maintenance.
Horizontally opposed and balanced cylinder design,
resulting in smooth, vibration-free operation.
Hydraulic crosshead-to-piston rod and piston
Adjustable crosshead shoes, which are
flat-faced for shimming.
Open type piston- and rider rings for easy
Pressure relief on rider rings to ensure longer life.
Rolled threads on all high tensile material bolting.
Ample valve cross-section and special gas
passages within the cylinders, resulting in a
minimum pressure drop, low power consumption
and low operating costs.
With frame sizes up to 25,800 kW, the Thomassen
C-series reciprocating compressor can accommodate
up to 6 compression cylinders. All components, inclu-
ding the crankcase, crankshaft, bearings, crosshead
body etc., have been designed for maximum strength
Our Free Floating Piston, which, as its name suggests,
floats on process gas, enables us to provide custo-
mers requiring non-lubricated compression with a first
class solution. We also manufacture compression sys-
tems capable of:
processing corrosive gasses, including HCL,
wet C02, SO2 and H2S;
enduring high operating pressures, up to 600 bars;
running with suction temperatures below 100oC.
One of the advantages of a reciprocating compressor
is that loss-free capacity control can be realised in
keep energy costs low with varying demand;
keep process conditions stable with
start the compressor completely or partly
Compressors can have stepped or stepless capacity
control and may be operated manually and/or automa-
When you specify and buy Thomassen compressors,
you are assured of the very latest engineering techno-
logy and the finest construction available in reciproca-
Q u a l i t y c o m p r e s s i o n
A Model C-25.2
compressor for use
in a gas depletion
plant of N.A.M. in the
northern part of
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The outstanding dependability and low maintenance of
Thomassen compressors has been demonstrated by
the many systems currently in service around the
A Diesel Hydro
plant using two model
C-25.4 hydrogen compres-
sors. Shell Fredericia.
A Model C-85.6 compres-
sor jointly developed by
Thomassen and Mitsui
Engineering and Shipbuil-
ding. The unit shown here
is one of three supplied
to a hydrocracking plant
in Indonesia. Each unit
from 14.5 to 197.4 bara
(in three stages) at a rate
of 56,265 Nm3/hr.
Two Model C-45.6
compressors used in
a reformer unit.
The 5.5 mW compressors
were supplied - via
Kvearner - to BP
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D e s i g n & E n g i n e e r i n g .
The fact that we have our own manufacturing capability
allows us to put Thomassen quality at the heart of your
installation. Our technical specifications - which meet or
exceed API and ISO - reflect the strict requirements of
the major oil and chemical companies. We have a strong
design philosophy and engage in fundamental research
and testing, including improved simulation techniques
that are confirmed by strain-gauge measurements of
dynamically loaded components. All components we
develop and design are subjected to rigorous static and
dynamic tests on Thomassens in-house heavy-duty
compressor. Moreover, the experience we gain in the
field continually helps us to improve our systems.
T o r s i o n a l v i b r a t i o n a n a l y s i s .
With the increasing application of large, variable speed
compressors, the rotating system must be studied in
detail to determine its torsional behaviour during start-
up and over a wide range of operating speeds and
conditions. As part of this process, it is essential that
the components and oscillating torque in the system
can be described as accurately as possible. Thomas-
sens computer model precisely simulates the real sys-
tem by including moments of inertia that are variable
and crank angle-dependent. The model also enables
the influence of individual sources of damping to be
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7F i n i t e E l e m e n t A n a l y s i s .
Thomassen has its own in-house finite element model-
ling (FEM) facilities. It is particularly important that
heavy-duty compressor components are designed as
efficiently as possible. Optimisation of designs will
reduce weight and result in lower free forces and
moments. The use of FEM calculations ensures that
designs have excellent characteristics in terms of
strength, rigidity and reliability.
B e a r i n g S i m u l a t i o n p r o g r a m .
Rod loads in reciprocating compressors are time-
dependent, and differ for all bearings due to the sum-
mation of gas- and oscillating component inertia for-
ces. We have developed a simulation program for a
dynamically loaded bearing, enabling us to analyse its
behaviour under severe and variable operating condi-
tions. This program makes it possible to predict the
influence of various parameters such as load, load
reversal, speed, bearing clearance, oil temperature, oil
C A D D e s i g n .
We make extensive use of solid modelling techniques
when designing compression installations. The above
picture shows a CAD model of a compressor installed
at Petrogal in Portugal.
Our proactive approach to Design & Engineering has
resulted in major improvements in uptime and reliabili-
ty. Our current target is to ensure that our reciproca-
ting compressors can run continuously for a period of
three years. And, as a result of tests run under real
process conditions on our own test compressor, we
anticipate even higher standards in the near future.
Digital image of a 2-cylinder compressor.
Model illustrating the deflection of a
segment of a double-acting compressor
piston with preloaded piston rod.
The loading included different gas
pressures on both sides of the piston as
well as transient thermal conditions.
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81. Crankcase / oilsump
2. Crankshaft with integral forged drive flange
3. Main bearing
4. Connecting rod
6. Adjustable, replaceable crosshead shoes
7. Piston rod with hydraulic connections
8. Partition cover with oil and gas seal
9. Double compartment partition cover with gas seal
10. Crosshead guide / Distance piece
11. Cooling water jacket
13. Replaceable dry type cylinder liner
15. Forged steel cylinder
16. Piston with PTFE rider- and piston rings
17. Pneumatic valve actuator
18. Multi-valve type cast cylinder