Description |
Trouble Shooting for Lubricating Oil Cooler |
503.10 |
Page 1 (2) |
Edition 01H |
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L23/30H |
Trouble Shooting
In case of damage to plates or gaskets, it will often be necessary to replace these.
First examine the external conditions around the plate heat exchanger in order to localize the cause of the damage! very carefully.
In case of fatigue fracture, this will normally necessitate a replacement of all plates and gaskets as there may be a risk of fatigue fracture in all the material.
In case of corrosion, all plates must be examined carefully!
For work to be carried out see working card 51506.00.
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Visible Leakage |
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Trouble |
Possible Cause |
Trouble Shooting |
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Leakage. |
Too high pressure. |
Reduce the pressure to the correct work- |
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ing pressure, see page 500.30 "Operat- |
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ing Data & Set Points". |
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Leakage. |
Insufficient tightening |
Tighten up the plate heat exchanger - |
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(Phase 1) |
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however, not under the minimum dimen- |
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sion and never, when the plate heat |
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exchanger is under pressure or over |
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40°C. |
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If the plate heat exchanger is still leaky, |
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proceed to with phase 2. |
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Leakage. |
Fouled or deformed plates. |
Separate the plate heat exchanger and |
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(Phase 2) |
Inelastic or deformed gaskets. |
checkiftheplatesaredeformedorfouled. |
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Check that the gaskets are elastic and |
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non-deformed, and that the faces of the |
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joints are clean. |
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Replace deformed plates and gaskets, if |
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any. |
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Before assembling clean all plates and |
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gaskets very carefully. |
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Assemble the plate heat exchanger and |
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start it up again. |
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Note! Even tiny impurities such as sand |
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grains may cause leakage. |
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0D/H5250/94.08.12-08028 |
kets) |
plate. |
Separate the plate heat exchanger. |
any. |
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Leakage. |
Gaskets. |
Clean the plates very carefully. |
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(Even after tightening of the plate heat |
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Replace the gaskets. |
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exchanger to minimum dimension) |
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Assemble the plate heat exchanger and |
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start it up again. |
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Leakage. |
Defective gasket or badly corroded |
Separate the plate heat exchanger. |
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(Through the drain holes of the gas- |
Replace defective plates and gaskets, if |
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Assemble the plate heat exchanger and |
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start it up again. |
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96.30 - ESOU-G
503.10 |
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Trouble Shooting for Lubricating Oil Cooler |
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Description |
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Edition 01H |
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Page 2 (2) |
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L23/30H |
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Non-Visible Leakage |
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Trouble |
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Possible Cause |
Trouble Shooting |
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Reduced heat transmission and/or in- |
Fouled plates or choked plate |
Separate the plate heat exchanger and |
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creasing pressure drop. |
channels. |
check if the plates are fouled. |
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Clean the plates very carefully. |
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Assemble the plate heat exchanger and |
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start it up again. |
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Leakage. |
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Holes in plates. |
A suspected leakage can be localized in |
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(The fluids get mixed) |
Corrosion or fatigue fracture. |
the following way: |
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(Phase 1) |
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Remove one of the lower pipe connec- |
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tions. |
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Then put the opposite side under pres- |
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sure. |
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If the medium continues to run out of the |
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lower pipe connections after the pres- |
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sure has stabilized one or several plates |
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are leaking. |
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Close down the plate heat exchanger. |
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Separate the plate heat exchanger and |
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check the plates very carefully. |
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Check suspected plates with a dye pen- |
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etrant. |
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Check defective plates and gaskets. |
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Before assembling, clean all plates and |
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gaskets. |
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Assemble the plate heat exchanger and |
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check to find more defective plates, if |
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any, by putting one side under pressure. |
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Start up again. |
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Leakage. |
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Holes in plates. |
Close down the plate heat exchanger. |
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(The fluids get mixed) |
Corrosion or fatigue fracture. |
Separate the plate heat exchanger. |
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(Phase 2) |
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Put all plates to dry. Suspend the plates |
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in the plate heat exchanger again and |
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tighten it. |
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Circulate medium at full capacity on one |
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plate side (every second plate channel). |
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Keep the other plate channels unpres- |
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surised and free from liquid! |
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Stop the circulation after a few minutes |
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of operation and open the plate heat |
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0D/H5250/94.08.12-08028 |
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exchanger again. Take care to avoid |
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water spraying onto the dry plate side! |
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By a careful study of the plates it will be |
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possible to find moist areas, if any, on |
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the otherwise dry plate sides. |
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Check these areas with a dye penetrant! |
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Replace defective plates and gaskets. |
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Before assembling, clean all plates and |
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gaskets. |
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Assemble the plate heat exchanger and |
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check to find more defective plates, if |
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any, by putting one side under pressure. |
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Start up again. |
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If the unit is still leaking, check all plates |
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with a dye penetrant! |
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96.30 - ES0U-G
Index
Page 1 (1)
Specification and Treatment Lubricating Oil, Fuel |
504 |
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Oil and Cooling Water |
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L23/30H |
Description |
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Lubricating Oil Specification............................................................................................... |
504.01 (01H) |
Maintenance of Lubricating Oil Condition ........................................................................ |
504.03 (01H) |
Criteria for Cleaning/Exchange of Lubricating Oil ............................................................ |
504.04 (01H) |
Lubricating Points ............................................................................................................. |
504.05 (01H) |
Lubricating Oil in Base Frame .......................................................................................... |
504.06 (01H) |
Lubricating Oil in Base Frame .......................................................................................... |
504.06 (04H) |
Fuel Oil Specification ....................................................................................................... |
504.20 (02H) |
Fuel Oil Quality ................................................................................................................ |
504.25 (01H) |
Nomogram for Determination of CCAI ............................................................................. |
504.26 (01H) |
Analysis Data ................................................................................................................... |
504.27 (01H) |
Fuel Oil Cleaning ............................................................................................................. |
504.30 (01H) |
Fresh Water System Treatment ....................................................................................... |
504.40 (01H) |
Working Card
Plates
08028-0D/H5250/94.08.12
99.04-ES0U
Description |
Lubricating Oil Specification |
504.01 |
Page 1 (2) |
Edition 01H |
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The lubricating oil of a 4-stroke engine is a fundamental element in good engine operation, as it serves quite a few important purposes, such as:
1) Lubricating the bearings, the cylinders, the piston rings and other movable parts of the engine.
2) Neutralizing the effect of sulphur in the fuel oil to prevent corrosion of cylinder liners and piston rings.
3) |
Cooling of bearings and pistons and keeping |
the interior clean. |
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Transporting contaminants such as dust, rust, |
water, combustion residues, lubricating oil residues, etc. away from the engine to the filters and separators.
Consequently, the lubricating oil is a finely balanced mixture of a suitable base oil to provide lubrication and cooling, and a series of lubricating oil additives to take care of the neutralizing task, the cleaning and transportation of contaminants, as well as other additives to ensure the continuity of these abilities.
L23/30H
Total Base Number (TBN)
TBN indicates the alkalinity of the lubricating oil and, consequently, its neutralizing effect on acids developed from the sulphur in the fuel oil. The TBN is normally reduced gradually during a period of operation. The influential elements are the sulphur content in the fuel oil and the amount of refilling due to normal consumption. After a certain time of operation, the TBN will stabilize at a lower value, the TBN equilibrium, as illustrated in fig. 1.
TBN
Refilling
TBN
Initial
TBN equilibrium
Lubricating Oil Specification
Service hours
08028-0D/H5250/94.08.12
A HD-lubricating oil (heavy duty) corresponding to at least type CD Commercial Class D acc. to API service system (meets MIL-L-2104 C and D) has to be used. The oil should be rust and oxidation inhibited.
For engines cooled directly - or indirectly by seawater an SAE 30 oil ( 105 mm²/sec. at 40° C) should always be used.
In some cases, where a sufficiently low cooling water temperature, is unattainable, an SAE 40 oil (145mm²/sec. at 40 °C) can be chosen, provided that the thermostatic element in the built-on lub. oil thermostatic valve is changed.
When selecting a lubricating oil, attention must be paid to the fuel sulphur content. Due to generating sets normally operating at a moderate load, the sulphur input from the fuel are generally lower than for propulsion engines.
Fig. 1 Alteration and stabilization of TBN-value during a period of operation.
96.02 - ES2S-G
504.01 |
Lubricating Oil Specification |
Description |
Edition 01H |
Page 2 (2) |
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L23/30H
In fig. 2 the relationship between the fuel oil sulphur content and the adequate TBN of the lubricating oil is illustrated. When selecting a lubricating oil, the area "TBN initial" is to be used and the stabilized level of the lubricating oil should be kept within the area "TBN equilibrium". Refilling due to normal lubricating oil consumption should be carried out with lubricating oil from the initial TBN area.
If the TBN value, stabilized within the recommended area "TBN equilibrium", is disturbed due to temporarily abnormal operation conditions and forced to a level beyond the recommended TBN equilibrum, it may be adjusted by refilling a lubricating oil of a similar type as used in the engine, however, with another TBN-initial.
This method of adjusting the TBN value should, however, only be used when approved by the lubricating oil supplier.
If, during normal operation, the TBN is found to stabilize at a level period the recommended TBN equilibrium zone, a change to a lubricating oil of a more suitable TBN initial should be considered.
TBN
35
30
25
20
15
10
5
1 2 3 4 5
% Sulphur in fuel oil
Fig. 2 TBN - value in relation to the fuel oil sulphur content.
08028-0D/H5250/94.08.12
96.02 - ES2S-G