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Welcome
to Vishvas Power Engineering Services Pvt. Ltd. |
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Sr. No.
(1)
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Characteristics
(2)
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Requirement
(3)
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Method of
Tests
(4)
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Remarks
(5)
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i)
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Appearance
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The oil
shall be clear and transparent and free
from suspended matter or sediments
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A
representative sample of the oil shall
be examined in a 100 mm thick layer at
27° C
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-
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ii)
|
Density at
29.5°C Max
|
0.89 g/cm
2
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IS 1448 (P
: 16) : 1977
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See Note 1
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iii)
|
Kinematic
viscosity, Max, at
a)
27° C
b)
40° C
|
27 cSt
Under
consideration
|
IS 1448 ( P
: 25): 1976
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-
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iv)
|
Interfacial
tension at 27° C, Min
|
0.04 N/m
|
IS 6104 :
1971
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-
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v)
|
Flash point
Pensky- Marten (closed), Min
|
140 °C
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IS 1448 (P
: 21) : 1970
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-
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vi)
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Pour point,
Max
|
- 6°C
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IS 1448 (P
: 10) : 1970
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-
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vii)
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Neutralization value
a)
Total
acidity, Max
b)
Inorganic
acidity/ alkalinity
|
0.03 mg KOH/G
Nil
|
IS 1448 (P
: 2) : 1967
do
|
Alcoholic
potassium hydroxide solution of 0.02 N
should be used in place of 0.1 N
indicated in test method.
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viii)
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Corrosive
sulphur
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Non-corrosive
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Annex B
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-
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ix)
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Electric
Strength
(Breakdown
voltage)
a)
New
unfiltered oil, Min
b)
After
filtration, Min
|
30 KV (rms)
If the
above value is not attained. The oil
shall be filtered 60 KV (rms)
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IS 6792 :
1972
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-
See Note 2
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x)
|
Dielectric
dissipation factor (tan
d
)
at 90°C, Ma
|
0.002
|
IS 6262 :
1971
|
See Note
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xi)
|
Specific
resistance (resistivity)
a)
At 90°C,
Min
b)
At 27°C,
Min
|
35 x 1012
ohm-cm
1500 x 1012
ohm-cm
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xii)
|
Oxidation
stability
a)
Neutralization value after oxidation,
Max
b)
Total
sludge, after oxidation, Max
|
0.4 mg KOH/g
0.1 percent
by weight
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Annex C
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-
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xiii)
|
Ageing
characteristics after accelerated ageing
(open beaker method with copper
catalyst)
a)
Specific
resistance (resistivity)
1)
at 27°C,
Min
2)
at 90°C,
Min
b)
Dielectric
dissipation factor (Tan
d
)
at 90° C, Max
c)
Total
acidity, Max
d)
Total
sludge, Max
|
-
2.5 x 1012
ohm-cm
0.2 x 1012
ohm-cm
0.20
0.05 mg KOH/g
0.05
percent by weight
|
IS 12177 :
1987
Method A
IS 6103 :
1971
IS 6262 :
1971
IS 1448 (P
: 2) : 1967
Annex A of
IS 12177
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-
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xiv)
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Presence of
oxidation inhibitor
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The oil
shall contain antioxidant additives
|
IS 13631 :
1992
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See Note 3
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xv)
|
Water
content, Max
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50 ppm
|
IS 13567 :
1992
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-
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xvi)
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SK value
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Under
consideration
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Annex D
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-
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Information in Stage
Interaction :
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IS 335
NEW OIL
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Table 1 Schedule of Characteristics
(Clauses 5.1 and 9.1)
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Sr. No.
(1)
|
Characteristics
(2)
|
Requirement
(3)
|
Method of
Tests
(4)
|
Remarks
(5)
|
|
i)
|
Appearance
|
The oil
shall be clear and transparent and free
from suspended matter or sediments
|
A
representative sample of the oil shall
be examined in a 100 mm thick layer at
27° C
|
-
|
|
ii)
|
Density at
29.5°C Max
|
0.89 g/cm
2
|
IS 1448 (P
: 16) : 1977
|
See Note 1
|
|
iii)
|
Kinematic
viscosity, Max, at
a)
27° C
b)
40° C
|
27 cSt
Under
consideration
|
IS 1448 ( P
: 25): 1976
|
-
|
|
iv)
|
Interfacial
tension at 27° C, Min
|
0.04 N/m
|
IS 6104 :
1971
|
-
|
|
v)
|
Flash point
Pensky- Marten (closed), Min
|
140 °C
|
IS 1448 (P
: 21) : 1970
|
-
|
|
vi)
|
Pour point,
Max
|
- 6°C
|
IS 1448 (P
: 10) : 1970
|
-
|
|
vii)
|
Neutralization value
a)
Total
acidity, Max
b)
Inorganic
acidity/ alkalinity
|
0.03 mg KOH/G
Nil
|
IS 1448 (P
: 2) : 1967
do
|
Alcoholic
potassium hydroxide solution of 0.02 N
should be used in place of 0.1 N
indicated in test method.
|
|
viii)
|
Corrosive
sulphur
|
Non-corrosive
|
Annex B
|
-
|
|
ix)
|
Electric
Strength
(Breakdown
voltage)
a)
New
unfiltered oil, Min
b)
After
filtration, Min
|
30 KV (rms)
If the
above value is not attained. The oil
shall be filtered 60 KV (rms)
|
IS 6792 :
1972
|
-
See Note 2
|
|
x)
|
Dielectric
dissipation factor (tan
d
)
at 90°C, Ma
|
0.002
|
IS 6262 :
1971
|
See Note
|
|
xi)
|
Specific
resistance (resistivity)
a)
At 90°C,
Min
b)
At 27°C,
Min
|
35 x 1012
ohm-cm
1500 x 1012
ohm-cm
|
|
|
|
xii)
|
Oxidation
stability
a)
Neutralization value after oxidation,
Max
b)
Total
sludge, after oxidation, Max
|
0.4 mg KOH/g
0.1 percent
by weight
|
Annex C
|
-
|
|
xiii)
|
Ageing
characteristics after accelerated ageing
(open beaker method with copper
catalyst)
a)
Specific
resistance (resistivity)
1)
at 27°C,
Min
2)
at 90°C,
Min
b)
Dielectric
dissipation factor (Tan
d
)
at 90° C, Max
c)
Total
acidity, Max
d)
Total
sludge, Max
|
-
2.5 x 1012
ohm-cm
0.2 x 1012
ohm-cm
0.20
0.05 mg KOH/g
0.05
percent by weight
|
IS 12177 :
1987
Method A
IS 6103 :
1971
IS 6262 :
1971
IS 1448 (P
: 2) : 1967
Annex A of
IS 12177
|
-
|
|
xiv)
|
Presence of
oxidation inhibitor
|
The oil
shall contain antioxidant additives
|
IS 13631 :
1992
|
See Note 3
|
|
xv)
|
Water
content, Max
|
50 ppm
|
IS 13567 :
1992
|
-
|
|
xvi)
|
SK value
|
Under
consideration
|
Annex D
|
-
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NOTES:
1. Density of the oil may be measured at ambient
temperature and converted to 29.5°C using the
following equation:
29.5 p – Pt {1 + X (t-29.5)}
Where
t – Ambient temperature (in °C),
pt – Density measured at temperature
t, and
x – Correction factor (equal to 65 x 10-5
approximately)
2. As a consequence of the tendency for water
absorption to occur due to breathing on storage
even when drums are sealed the oil shall be
filtered to remove moisture and particulate
contaminants preseal in the original sample
before the treat as follows :
‘A sufficient quantity of oil is heated to 90
+ 2°C, then filtered hot under vacuum
corresponding to an absolute pressure of about
2.5 kpa through a sintered glass filter of
porosity grade 4’.
A portion of the filtrate is cooled in
desiccators and used immediately to measure
electric strength, if required, and specific
resistance at 27°C. The remaining hot filtrate
is immediately used for measuring dielectric
dissipation factor at 90°C and specific
resistance at 90°C.
3. For both phenol and amine types of
indicators, qualitative method as per Annex D
shall be adopted. In case of ambiguity (marginal
cases) in finding the intensity of colour, a
quantitative method as given in Annex D shall be
adopted. Value of 0.5 (Max) shall be treated as
absence of DBPC – Phenolic type inhibitor
(Quantitative method for amins is under
consideration).
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