MTM450

Limiti d'impiego

Product description

It is surely the more resistant propeller shaft mechanical seal on the market. 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 it, in the rotating part, there is another international recognised 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. Thanks to the “Repair Kit” in two halves the maintencance can be caried out directly on the mechanical seal without decoupling the shaft from the coupling. Additionaly, the MTM400 together with the hydraulic barrier system (Watershield) allows to carry out maintenance with the boat in the water. 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 to be certified, as standard, for fire resistance. 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 a axial/radial vibration sensor. Suitable for all applications, it is the best product for 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

MTM450

Part list

1. O-ring
2. Stationary case
3. Spring
4. O-ring
5. Stationary face
6. Light clamp
7. Light clamp
8. Rotary face
9. O-ring
10. O-ring
11. Rotary case
12. O-ring flange
13. Centering ring
14. Grub screw
15. Screw
16. Screw

Product description

It is surely the more resistant propeller shaft mechanical seal on the market. 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 it, in the rotating part, there is another international recognised 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. Thanks to the “Repair Kit” in two halves the maintencance can be caried out directly on the mechanical seal without decoupling the shaft from the coupling. Additionaly, the MTM400 together with the hydraulic barrier system (Watershield) allows to carry out maintenance with the boat in the water. 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 to be certified, as standard, for fire resistance. 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 a axial/radial vibration sensor. Suitable for all applications, it is the best product for mega yachts, passenger and military vessels.

Part list

1. O-ring
2. Stationary case
3. Spring
4. O-ring
5. Stationary face
6. Light clamp
7. Light clamp
8. Rotary face
9. O-ring
10. O-ring
11. Rotary case
12. O-ring flange
13. Centering ring
14. Grub screw
15. Screw
16. Screw

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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