TREM Engineering
an efficient base
TREM Engineering
Dry Gas Seals for
Process
Compressors in
Heavy Duty
Industries
TREM Engineering, Vorontsovskaya St 35B, Bldg 2, Floor 4, Pom. II, Office 63, Moscow, Russia 109147, tel/fax +7-495-7807676, e:mail:
trem@trem.ru web: www.tremseals.com
The majority of modern centrifugal
compressors are equipped with Dry
Gas Seals (DGS)
Reasons:
- Longer Service Life
- No lubricating oil in
process gas
- No lubricating oil
consumption
- No oil contamination of
catalyst
Dry Gas Seals Principle of Operation
• Dry Gas Seals are the
seals where the process
gas leakage protection is
done by the thin film of
gas between rotating
and stationary seal
faces.
• The thickness of gas
film is just few micron.
• The rotating and
stationary seal faces are
not in contact.
Dry Gas Seals Grooves’ Profiles
To ensure the permanent film of gas between
seal faces the rotating seal faces are equipped
with groves with maximum depth 15 micron
TREM Dry Gas Seals Technology
Dry gas seals – the design
created by our
special engineering team:
• Designers from compressor design office (used to work
for compressor manufacturer in Kazan, Russia)
• Consultations with Samara State Aerospace University,
Russia.
• Other scientific sources, Russian and International
standards including API 614, 617, 692.
Dry Gas Seals Technology.
Gas Dynamics Calculations done with use of special
software
Area of symmetry 3D Groove Model
Pressure Density Speed Re M
Dry Gas Seals Technology.
Seal Rings Stress Calculations
С1 С2
F1
W
W ω
Rw H
The important part of design is the field
engineering and close relations with End Users.
The design shall be customized for specific
application conditions and End User needs.
Application range
Centrifugal Overhang and Between Bearing
Compressors; Rotary-Screw Compressors
Shaft size, mm
50-250
Speed, RPM
100-40000
Temperature, °C
-50/+200
Pressure, bar, dynamic
250
Pressure, bar, static 300
Special Design Features:
• Stress optimized seal faces.
• Silicon carbide rotating seal
faces. Lower centrifugal
forces, better balance.
• Special carbon (Diamond like)
coated silicon carbide faces.
Reduction of initial friction.
• Varying depth of grooves.
Greatly extends service life by
zero RPM speed lift off.
Special Design Features for High
Pressure:
• Use of special grade PTFE
secondary seals at high
pressures. Comparing to
rubber o-rings better
pressure resistance.
• Use of PTFE secondary
seals requires very high
tolerances of metal parts.
Special Design Features for High
Rotation Speeds:
• Use of titanium metal parts
in seal rotor assembly.
Lower centrifugal forces,
better balance.
• Use of special grade PTFE
secondary seals. Better
mechanical properties at
high rotation.
Solutions for Gas Treating:
• Few stages of gas filtration
with final filtration up to 1
micron in special cases.
• Use of clean gas at the
start-up and shut-down of
compressor.
• Use the gas heaters and
liquid traps for gas with risk
of liquid parts appearing.
Test Procedures
All compressor seals (new and repaired)
shall be fully tested with over speed and
over pressure.
Test Procedures
The rotating seal faces shall take spin-up test
to avoid the destruction at high rotation speeds
50-200
100-40000
-50/+200
250
300
The End Users of TREM Engineering
Dry Gas Seals
Today TREM Engineering Dry Gas Seals
work at compressors produced by:
New Dry Gas Seals example
Complete gas seal
and its rotor unit.
Other brands Dry Gas Seals repair
example
Seals and parts came
for repair
The repaired seal
Example of compressors upgraded to
Dry Gas Seals
Lukoil Stavrolen
Petrochemical Plant
in the South of
Russia
2015 – upgrade of ethylene compressor unit consists of two connected
compressors, four stages totally, Borsig make. Suction pressure 0.04 bar,
discharge pressure 38 bar. After upgrade the compressor was in operation without
any problems with seals for the four years ( 2015-2019). Before the upgrade 1-3
seal repairs per year took place with the compressor shutdown.
Example of compressors upgraded to
Dry Gas Seals
Lukoil Stavrolen Petrochemical
Plant in a south of Russia
2017 – upgrade of four compressor units. The
upgrade was completed during the plant shut
down (40 days). The operation of all upgraded
compressors started at the same time:
A. Pyrolysis gas compressor unit consists of three connected compressors, five
stages totally, Thomassen make. The suction pressure 0.1 bar, discharge
pressure 35 bar;
B. Recycle gas compressor unit consists of two connected compressors, four
stages totally, Borsig make. The suction pressure 0.2 bar, discharge pressure
30.5 bar;
C. Propylene three stages compressor unit of Thomassen make. The suction
pressure 0.2 bar, discharge pressure 16.2 bar;
D. Reaction sour gas overhang compressor unit of Borsig make. The suction
pressure 5.6 bar, discharge pressure 9.8 bar.
TREM Engineering outside Russia
• Europe and Central Asia: Ukraine,
Kazakhstan, Azerbaijan ,
Uzbekistan, Turkmenistan,
Belorussia, Pakistan, Romania,
Bulgaria, Serbia.
• Latin America: Brazil, Peru, Chile.
• Middle East and Africa: Iran, Iraq,
Algeria, Saudi Arabia, UAE, Egypt,
Kuwait, Oman, Nigeria.
• Far East: Vietnam, Philippines,
Indonesia, Malaysia.
Our commitment
1. Qualified service engineers are ready to assist
the End User within 24 hours.
2. The minimum operation time of Dry Gas Seals is
100 000 working hours.
3. The warranty conditions are 24/36 month, 24/48
month and other depending on project
requirements.
