MTM400

Limiti d'impiego

Product description

Microtem’s MTM400 is the propeller shaft seal among the most resistant ones on the market today. The MTM400, in comparison with all the existing propeller shaft mechanical seals, is the first in the world to be equipped with a double series of springs. This allows it to better compensate for angular and radial misalignments. Moreover, springs together with a double system of O-rings give rise to what Microtem has named DEDaS® (Double Elastic Damping System), that is an elastic damping system able to make the MTM400 resistant to 60 g shock and to 60 mm/s (RMS) of vibration.

Inside of MTM400, in the rotating part, there is another international recognized innovation: the pumping ring. This technology, newly introduced in the propeller shaft seals, ensures that the cooling fluid (usually water) is distributed to a greater and better extent on the sliding faces, increasing the heat dissipation and thus reducing consumption. All this allows MTM400 to achieve performance over 60.000 hours of operation before maintenance. Of equal importance is the design, as its compact size allows the seal to be one of the axially smaller solutions in the world.

Additionally, the MTM400 together with the dynamic pneumatic barrier (Watershield®) is the most reliable and strong solution available today on the market. It is designed for shafts with diameter 50 mm to 800 mm, and it is certified by RINA. There are different possible material configurations and it is the only product fireproof. The stationary flange can be designed with a maximum of 6 radial holes that allow to connect: one or more auxiliary cooling lines for the bearing, a pressure gauge, a temperature gauge, a flow gauge or an axial/radial vibration sensor. MTM400 is a propeller shaft seal suitable for all applications, it is the best product for superyachts, mega yachts, passenger and military vessels.

Operative limits

d = from 50 mm (2″) up to 800 mm (31,5″) *
p1 = 2 bar (29 psi)
T = from -40°C (-40°F) up to +400°C (752°F)
vg = 10 m/s (32 m/s)
Axial Movement : up to -5/+8 mm
Radial movement : up to +/-5 mm
Angular movement : up to 2°
* Available in inches too

Standard face materials

Rotary face:
Resin/antimony carbon (G/G1)
Silicon carbide (S)

Stationary face:
Silicon carbide (S)

Elastomers

NBR / Nitrile (N)
EPDM / Ethilene propylene (E)

Applications

Medium/Large Yachts
Work boats
Patrol boats
Tugs
Passenger transport
Water-lubricated lines
Oil lubricated lines

MTM400

Part list

1. Stationary flange
2. Rotary case
3. Sleeve
4. Stationary seal face
5. Rotary seal face
6. Drive ring
7. O-ring
8. O-ring
9. O-ring
10. O-ring
11. Pin
12. O-ring
13. Pin
14. Screw
15. Spring
16. Water inlet
17. Pneumatic barrier
18. Watershield® case
19. Centering ring
20. Rubber
21. O-ring
22. Compression ring

Product description

Microtem’s MTM400 is the propeller shaft seal among the most resistant ones on the market today. The MTM400, in comparison with all the existing propeller shaft mechanical seals, is the first in the world to be equipped with a double series of springs. This allows it to better compensate for angular and radial misalignments. Moreover, springs together with a double system of O-rings give rise to what Microtem has named DEDaS® (Double Elastic Damping System), that is an elastic damping system able to make the MTM400 resistant to 60 g shock and to 60 mm/s (RMS) of vibration.

Inside of MTM400, in the rotating part, there is another international recognized innovation: the pumping ring. This technology, newly introduced in the propeller shaft seals, ensures that the cooling fluid (usually water) is distributed to a greater and better extent on the sliding faces, increasing the heat dissipation and thus reducing consumption. All this allows MTM400 to achieve performance over 60.000 hours of operation before maintenance. Of equal importance is the design, as its compact size allows the seal to be one of the axially smaller solutions in the world.

Additionally, the MTM400 together with the dynamic pneumatic barrier (Watershield®) is the most reliable and strong solution available today on the market. It is designed for shafts with diameter 50 mm to 800 mm, and it is certified by RINA. There are different possible material configurations and it is the only product fireproof. The stationary flange can be designed with a maximum of 6 radial holes that allow to connect: one or more auxiliary cooling lines for the bearing, a pressure gauge, a temperature gauge, a flow gauge or an axial/radial vibration sensor. MTM400 is a propeller shaft seal suitable for all applications, it is the best product for superyachts, mega yachts, passenger and military vessels.

Part list

1. Stationary flange
2. Rotary case
3. Sleeve
4. Stationary seal face
5. Rotary seal face
6. Drive ring
7. O-ring
8. O-ring
9. O-ring
10. O-ring
11. Pin
12. O-ring
13. Pin
14. Screw
15. Spring
16. Water inlet
17. Pneumatic barrier
18. Watershield® case
19. Centering ring
20. Rubber
21. O-ring
22. Compression ring

Standard face materials

Rotary face:
Resin/antimony carbon (G/G1)
Silicon carbide (S)

Stationary face:
Silicon carbide (S)

Elastomers

NBR / Nitrile (N)
EPDM / Ethilene propylene (E)

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