Specific Plant Information

Resilient Mounting of Generating Sets

On resiliently mounted generating sets the diesel engine and the alternator are placed on a common rigid base frame mounted on the vessel's/engine room's foundation by means of resilient supports, type conical.

All connections from the generating set to the external systems should be equipped with flexible connections and pipes. Gangway etc. must not be welded to the external part of the installation.

Resilient Support

Resilient mounting of the generating set is made with a number of conical mountings. The number and the distance between them depend on the size of the plant. These conical mountings are bolted to brackets on the base frame, see fig 1.

The setting from unload to load condition is normally 5-11 mm for the conical mounting.

The support of the individual conical mounting can be made in one of the following three ways:

L23/30H

1.The support between the bottom flange of the conical mounting and the foundation is made with a loose steel shim. This steel shim is adjusted to an exact measurement (min. 75 mm) for each conical mounting.

2.The support can also be made by means of two steel shims, at the top a loose steel shim of at least 75 mm and below a steel shim of at least 10 mm which are adjusted for each conical mounting and then welded to the foundation.

Mounting and Adjustment Instructions for New Generating Sets (Method 1)

Preparations for Adjustment of Conical Elements

If the conical elements have not been mounted by the factory, they must be mounted on the prepared brackets on the base frame. In case they have been mounted by the factory, please start with item no 2.

1)Fit the conical elements to the bracket of the suspended equipment by means of the nut in the top (7), see fig 1.

2)Position the four jacking bolts in the tapped holes (8), in the bottom flange, see fig 1.

3)Position the jacking bolts with a through-going of minimum 75 mm, see fig 2.

4)Lower the generating set until it rests completaly on the foundation .

5)Check that all jacking bolts have full contact with the foundation.

6)Remove the nut (1) from the conical element, see fig 1.

7)Turn all the internal buffers (2) in order to check that they move freely, see fig 1.

Adjustment of Conical elements after 48 Hours Settling

After the conical elements have been deflected under static load for 48 hours, the laden height(H1) should be measured and compared to the recommended laden height, see fig 2.

8)Check the laden height by measuring the height of the individual conical element with a gauge block micrometer at two positions.

The difference between the individual conical elements should be as little as possible and not exceed ± 2 mm in order to secure the overall level and load distribution.

Example:

Note: The internal buffer must be abel to move freely during the entire adjustment procedure.

Measuring of Steel Shim

9)Measure the steel shim on several points to obtain the highest possible accuracy during preparation.

Fabricating Steel Shim

10)Make sure that the minimum height of the steel shim is 75mm in order to secure a future replacement of the conical mounting.

Drill the mounting holes in the steel shim according to the conical base casting dimensions.

Mounting of Complete Steel Shim

11)Turn the internal buffer anti-clockwise until it contacts the base casting to secure the load height of each conical element.

12)Lift the generating sets by means of a crane or hydraulic jack.

13)Remove all jacking bolts.

14)Position each complete steel shim.

15)Lower the generating set until it rests completely in is itself.

16)Number each steel shim together with each conical element.

Adjustment of Internal buffer

17)Turn the internal buffer clockwise until it makes contact with the steel shim.

18)Turn the internal buffer anti-clockwise until it makes contact with the base casting.

This must be done in four full turns.

19)Turn the internal buffer 1½ turn clockwise and check with a feeler gauge between the bottom flange on the conical element and the steel shim that the internal buffer (2), see fig 1, does not touch the steel shim.

20)Mount the nut (1). Then block the internal buffer (2) with a spanner and at the same time tighten the nut (1) according to page 500.40.

Mounting of Conical Elements to Foundation

21)Drill four mounting holes in the foundation for each conical element.

22)Fix the conical element and the steel shim to the foundation with four bolts.

Note: After completion of the above the buffer clearance must be checked, see items 17,18,19 and 20.