Technical
Bulletin
Coolant
for Gas & Diesel Engine
By
Wanda – Technical Support PT Petrolube Cakra Persada
Improper cooling
system maintenance can result in various cooling system problems and failures. Many engine failures (40
% - 60%) are related to the cooling system. The following problems ;
overheating, leakage of the water pump, plugged radiators, and cylinder liner
pitting.
These
failure could be avoided with proper cooling system maintenance. Maintenance of
the cooling system is important to engine life and to the performance.
Coolant
provides three main functions ;
- Coolant provides cooling by transferring heat from the engine to the air.
- Coolant provides corrosions protection.
- Coolant provides anti-boil protection and antifreeze protection.
Coolant
is normally composed of three elements ;
- • Water
- • Additive
- • Glycol
The chart shown
below is a listing of the six most common problems seen in heavy duty cooling
systems. Along with each problem is a description of how it occurs, how it
affects the engine and, most importantly, how to prevent it.
WT SUPRA is a
so-called “water treatment” agent: it is an aqueous concentrate of specific
organic corrosion and cavitation inhibitors. Its special formula – containing
absolutely no phosphates, nitrites, amines, boron, nitrates or silicates –
gives it two important properties: first of all WT SUPRA is nonpolluting and,
secondly, it is long-lasting.
Typical
Characteristic
Typical Characteristic
|
Methods
|
WT Supra
|
Colour
|
-
|
Colourless
|
Density @20 deg C.
|
ASTM D 1122
|
1.058
|
pH
|
ASTM D 11287
|
9.4
|
pHdiluted to 5% by Volume
|
-
|
1
|
Applications
·
As a 5 to 10% solution in
water depending on its purpose, WT SUPRA will protect cooling
circuits in diesel and gas engines:
-
in combined heat and power
plants or electricity power stations requiring no antifreeze protection but
needing efficient heat transfer;
-
in ships engines;
-
on the factory test bed
during running-in and for the protection of the engine block against corrosion
between leaving the factory and entering service. Heat transfer systems (such
as heating plant or secondary circuits in cogeneration units) employing an aqueous
fluid.
·
It is preferable to use a
soft water even if laboratory tests give satisfactory results with water rated
at 20° TH (200ppm).
·
It is important that the
antifreeze should be mechanically mixed with the water to ensure a
uniform mixture.
·
When WT SUPRA is
used to flush circuits that have previously contained a different fluid, its
minimum concentration should be 5%.
·
When WT SUPRA is
used in the cooling systems of stationary engines, its minimum
concentration should be 7.5%.
·
A 10% dilution is recommended
when WT SUPRA is used to protect the cooling circuits of engines when
these are being run in on the test bed and during periods of storage (2
months).
Advantages
·
WT SUPRA protects circuits much better against cavitation and corrosion than
conventional ‘water treatment" products.
·
The absence of any
inorganic ingredients (such as phosphates, nitrites, etc.) means that no hard
deposits are formed, especially around the top of liners, cylinder heads, heat
exchanger tubes and electric heaters. As a result :
-
heat transfer is
sustained,
-
anti-corrosion and
anti-cavitation properties are maintained,
-
there is no risk of pipe
erosion due to hard particles in circulation,
-
the circuit remains clean.
·
The active ingredients in WT
SUPRA are non-polluting, and confer the same properties on the circuit
fluid so long as it does not contain any toxic substances such as monoethylene
glycol (a routine ingredient of ordinary antifreezes). These properties allow
it to be used in domestic heating installations.
·
When no antifreeze
protection is needed, filling a heat transfer circuit with WT SUPRA after
emptying out a conventional antifreeze gives better performance – thanks to the
fluid’s higher thermal capacity – at lower cost.
•
Optimum protection is
obtained when WT SUPRA is diluted in water of hardness below 20° TH,
containing no zinc and less than 300 ppm of chlorides and sulphates.
WT Supra Approvals ;
•
DEUTZ
AG : Gas engine series 616/620/2020/632 (Deutz Technical Circulation
0199-99-2091, 5th exchange date 07.01.2004)
•
MAN
248 (start of approval ; 13.01.04~12.01.06)
•
MTU
( MTL 5049) ; date 07.09.04
•
Wartsila
; Wartsila vasa 22/26/32/38/46/64/28SG/34SG/32DF, date 11.10.02
Reference: PDS
WT Supra, Article: Cooling System
Maintenance for Heavy Duty Engines
For additional information, please contact:
PT. PETROLUBE CAKRA PERSADA
The Promenade Building 2nd Floor, H2
Jl. Warung Buncit Raya No. 98 Jakarta 12510
Tel.: (62)-21-7048 1177/88
Fax.:(62)-21-7919 1336
Email: info@petrolube.co.id
Email: technical@petrolube.co.id