7 семестр (Бормотов А) / 1man_bw_l23_30_chn_23_30_instruktsiya_po_ekspluatatsii / MAN-BW L23-30 (ЧН 225_300)+ / MAN-BW L23-30 H Vol-1 (Instruction)+

08028-0D/H5250/94.08.12

Control of Cleaning Fluid Concentrations

Sodium hydroxide (NaOH) solution is tritrated with 0.1 n hydro-chloric acid (HCI) with methyl orange or methyl red as indicator.

Nitric acid (HNO3) solution is titrated with 0.1 n sodium hydroxide (NaOH) with phenolphtalin as indicator.

The concentration of the cleaning fluid in % can be calculated from the titration result by means of the following formula:

a: ml cleaning fluid taken out for titration

b: ml titration fluid used as cover

n : the molecular concentration of titration fluid m : The molecular weight of the cleaning fluid

(NaOH) molecular weight 40, HNO3 molecular weight 63)

Replacement of Plates and Gaskets

Marking

The plates are marked with material codes and reference numbers at each end, plus codes for nonglue gaskets, if any, and stamped with the letter V and H at either end (Fig 1).

Looking towards the gasket side, the plate is designated as a left plate, when the letter V is turning upwards - and a right plate when the letter H is turning upwards. Inlets and outlets of the V-plates are taking place through the corner holes Nos 1 and 4. Inlets and outlets of the H-plates are taking place through the corner holes Nos 2 and 3.

Replacement of Plates

Before mounting a spare plate in the plate stack, please make su-re that the spare plate is identical with the defective plate.

Note: The same corner holes must be open and the letters V and H must be placed correctly.

L23/30H

Replacement of Glued Gaskets

On Plate 51506 are stated gasket and glue quantity.

Please use a degreasing agent on the new gaskets.

The first plate after the end cover and the connector grid must have gaskets in all grooves. The gaskets are to be cut according to the existing gaskets.

Loosen the glued gaskets by heating the plate in water at 100o C. Clean the plates and remove the coatings, if any.

Cleaning of New Gaskets and Plates

New gaskets and gasket grooves of the plates are cleaned with a cloth moistened with degreasing agent. The glue surfaces must be absolutely clean - without finger prints etc.

Please use our cleaning fluid, which is according to suppliers recommendations.

Alternatively, please use:

-Trichloroethylene

-Chlorothene VG

-Acetone

-Methyl ethyl ketone

-Ethylacetat

It is important that all degreasing agent has evaporated, before the glue is applied. This will normally take approx. 15 min. at 20o C.

Clean the new gaskets on the glue surfaces with fine-grain sandpaper instead of the degreasing agent supplied.

L23/30H

Gluing

Pliobond 25, which is a nitrile rubber glue on solvent basis (25% solids). The glue is applied with a brush in a thin layer on the backs of the gaskets and the gaskets are to dry in a clean place free of dust.

Apply a thin layer of glue on the gasket grooves of the plates and press the gaskets down into the gasket grooves.

The insertion of gaskets starts at both ends of the plate - and continues with the straight sections along the edges.

The gluing process is most easily effected by placing the gaskets and the plates on a table. After having pressed the gaskets into the grooves of a plate, it is stacked.

The plates with the gaskets are now mounted in the frame which is lightly clamped. In case of use of rubber grooves, they are assembled to the minimum measure stated on the engine sign plus 0.2 mm per plate.

Heat up the plate heat exchanger to 90-100o C by means of water or steam.

Please note:

Assembling

If the plates have been dismounted, they have to be correctly assembled according to the plate item numbers.

The fixed cover has number 1 and the serial numbers for the subsequent plates and intermediate frames, if any, have the numbers 2, 3, 4, 5 etc.

The serial number are stamped in the right top corner of the plates. Further, please note that the gasket side must face the fixed cover.

-The temperature must be kept for 1½-2 hours.

-The liquid pressure must be kept as low as possible.

If there is no possibility of heating the plate heat exchanger, it must be placed in a spot as warm as possible with dismounted connections.

The drying time will at 20o C be approx. 48 hours. At for instance 40o C, the drying time is reduced to approx. 24 hours.

Fig. 1.

Fastening

Fasten the plate heat exchanger until the movable cover touches the duct spacers.

08028-0D/H5250/94.08.12

08028-0D/H5250/94.08.12

L23/30H

Related procedure:

L23/30H

Cleaning Procedure, see Plate 51515

1)Isolate the filter by closing the valve for lubricating oil inlet to the filter.

2)Slacken cover clamp ring (266). Unscrew cover fixing nut and lift off cover.

3)Lift off rotor assembly having allowed oil to drain from nozzles. The rotor should be removed and replaced on the spindle with extreme care in order to ensure that the bearings are not damaged.

4)Unscrew rotor cover nut (026) and separate cover (038) from body.

026

038

075

266

Fig 1 Centrifugal Bypass Filter

5)Remove stand tube (075) and clean.

6)Remove sludge from inside the rotor by means of a spatula and wipe clean. Ensure that all rotor components are throughly cleaned and free from deposits of dirt before reassembling the rotor.

Note: Failure to do so could cause an out-of- balance condition which will accelerate bearing and spindle wear.

7)Clean nozzle with brass wire. Examine top and bottom bearings in tube assembly. If damaged or worn - replace tube assembly complete. Examine O- ring (063) and renew if damaged.

8)Reassemble rotor complete and tighten top

nut.

9)Examine spindle journals. If damaged or worn

-replace with body assembly complete.

10)Reassemble filter complete checking that rotor revolves freely. Then replace filter body cover. Tighten cover nut and secure safety clamp. The clamp ring should be securely fitted at all times and the filter should not be run without the clamp ring fitted.

11)Open for lubricating oil.

12)With filter running check all joints for leakage. Check for excessive vibration.

Maintenance - Bearings and Spindle

All rotors are correctly balanced before leaving the factory. An out-of-balance condition can occur as a result of an uneven build up of sludge in the rotor or as a result of excessive bearing or spindle wear.

Dependent on the conditions, wear will eventually take place on the spindle and bearings and these should be replaced with factory fitted assemblies only.

08028-0D/H5250/94.08.12

To Check Bearing Clearances

This is most easily done by applying a dial gauge to the outside of the rotor opposite each bearing in turn and measuring the total play thus:

1)Apply dial gauge and measure play.

2)Turn rotor 90° and repeat measurement.

3)Re-apply dial gauge at 90° to previous position and repeat.

4)Turn rotor 90° and repeat.

L23/30H

The maximum clearances when new are 0,08 mm at top and 0,06 mm at bottom bearing. If the clearance exceeds 0,25 mm top or 0,2 mm bottom then check the sizes of the individual components and replace as necessary.

The spindle and body assembly and the rotor bearing tube assembly are factory assembled items and should only be replaced with complete assemblies.

Plate

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08028-0D/H5250/94.08.12

079

317

067

018

271

209

330

055

234

043 222

366

031

055

305

329

08028-0D/H5250/94.08.12

08028-0D/H5250/94.08.12

8L23/30H

720/750 RPM

055

8L23/30H

720/750 RPM

08028-0D/H5250/94.08.12

Plate

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