7 семестр (Бормотов А) / 1man_bw_l23_30_chn_23_30_instruktsiya_po_ekspluatatsii / MAN-BW L23-30 (ЧН 225_300)+ / MAN-BW L23-30h project-guide

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Description

The prelubricating oil pump box is for controlling the prelubricating oil pump built onto the engine.

The control box consists of a cabinet with starter, overload protection and control system. On the front of the cabinet there is a lamp for "pump on", a change-over switch for manual start and automatic start of the pump, furthermore there is a main switch.

The pump can be arranged for continuous or intermittent running. (For L16/24, L21/31 & L27/38 only continuous running is accepted).

Depending on the number of engines in the plant, the control box can be for one or several engines.

The prelubricating oil pump starting box can be combined with the high temperature preheater control box.

See also B 12 07 0, Prelubricating Pump.

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The preheater control box is for controlling the electric heater built onto the engine for preheating of the engines jacket cooling water during stand-still.

The control box consists of a cabinet with contactor and control system. On the front of the cabinet there is a lamp for "heater on" and a main switch for activating the system. Furthermore there is overload protection for the heater element.

The temperature is controlled by means of an on/off thermostat mounted in the common HT-outlet pipe. Furthermore the system secures that the heater is activated only when the engine is in stand-still.

Depending on the numbers of engines in the plant, the control box can be for one or several engines, however the dimensions of the cabinet will be the same. fig 1 illustrates a front for 3 engines.

The high temperature preheater control box can be combined with the prelubricating oil pump control box.

See also B 13 23 1 Preheating Arrangement in High Temperature System.

08028-0D/H5250/94.08.12

Ø10.2

340

Fig 1 Dimensions of the control cabinet.

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08028-0D/H5250/94.08.12

When the generating sets are installed on a transverse stiffened deck structure, it is generally recommended to strengthen the deck by a longitudinal stiffener inline with the resilient supports, see fig. 2.

For longitudinal stiffened decks it is recommended to add transverse stiffening below the resilient supports.

It is a general recommendation that the steel foundations is in line with both the supporting transverse

and longitudinal deck structure , fig. 1, in order to obtain sufficient stiffness in the support of the resi-

lient mounted generating sets. Fig 1 Transverse stiff deck structure.

The strength and the stiffness of the deck structure has to be based on the actual deck load, i.e. weight of machinery, tanks etc. and furthermore, resonance with the free forces and moments from especially the propulsion system have to be avoided.

Fig 2 Resilient supports.

08028-0D/H5250/94.08.12

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3)Finally, the support can be made by means of chockfast. It is recommended to use two steel shims, the top shim should be loose and have a minimum thickness of 40 mm, the bottom shim should be cast in chockfast with a thickness of at least 10 mm.

Irrespective of the method of support, it is recommended to use a loose steel shim to facilitate a possible future replacement of the conical mountings.

Adjustment of Engine and Generator on Base Frame

The resilient mounted generating set is normally delivered from the factory with engine and generator mounted on the common base frame. Eventhough engine and generator have been adjusted in the factory with the generator rotor correctly placed in the stator, and the crankshaft bend of the engine (autolog) within the prescribed tolerances, it is recommended to make an autolog before starting up the plant.