Marine Aggregates

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Power Transmission Systems

with gastight bulkhead and/or deck glands

between engine rooms and pump rooms

Application

The shaft transmissions with gastight bulkheads and/or deck glands have been developed for small and medium size tankers for the power transmission from driving engines in the engine-room to cargo pumps in the pump room. A suitably designed flange with centering ring enables the mounting of the transmission on the deck or bulkhead. The shaft of the gastight bulkhead gland is equipped with two grease lubricated roller bearings (at each side one bearing) and sealed by means of an oil reservoir, which is mounted approx. 0,50 – 0,75 m above the shaft centerline. Other kinds of special seals such as radial seal rings and single or double mechanical seals, can be delivered on request. The transmission with gastight glands is designed according to the latest rules of the classification societies and can be delivered with type-test certificates from ABS, BV, DNV, GL, L.R.o.S. and R.I.N.A.

Driving arrangements for cargo pumps

(mainly for smaller tankers)

• Electric motor or diesel engine as prime mover for cargo pump:

Normally a flexible coupling will be installed between the electric motor (or diesel engine) and the transmission shaft and a flexible coupling will be installed between the transmission shaft and the cargo pump. The length piece of the spacer coupling, if required, enables an easy dismantling of the cargo pump, motor or gastight bulkhead gland, if the bearings have to be renewed (see sketch).

• Diesel engine as prime mover for cargo pump and generator:

If a diesel engine is provided as driver, which will also be used for generator-drive and/or as main power source, then a highly elastic coupling with a clutch has to be installed between diesel engine and gastight bulkhead gland (see sketch).

The combination of a highly elastic coupling with a manually or pneumatically operated clutch ensures relatively short mounting lengths and will be preferred especially on small tankers. A spacer type flexible coupling will be recommended for the installation between gastight bulkhead gland and cargo-pump in this arrangement too. The system arrangement from diesel engine power take-off to the cargo pump driving shaft will be selected by us and a torsional vibration calculation will be carried out to ensure the proper operation of the selected system components.

1. centrifugal pump

2. flexible spacer-coupling

3. oil reservoir

4. gastight bulkhead gland

5. gear box

6. clutch

7. diesel engine

8. flexible coupling

9. generator

10. bulkhead

The complete systems can be delivered with a certificate of a classification society.

• In cases where a speed reduction or a speed increase is necessary, a reduction gear or a speedup gear will be delivered.

• Power transmission systems with gastight bulkhead glands are available for pump capacities up to 1000 m³/h – at 10 bar. Shaft transmission torques up to 5500 N/m – larger transmissions can be delivered on request.

• If you submit your pump transmission problems, we will prepare a complete transmission proposal to you with alternative solutions.

Cargo screw pump electric driven with gastight bulkhead gland

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