 |
 What
is diesel fuel lubricity? |
 |
Diesel fuel lubricity is a measure of diesel fuel's ability
to reduce wear on contacting metal surfaces found in fuel pumps
and injectors. In the case of diesel engines, fuel pumps and
fuel injectors are lubricated by the fuel, so lubricity is a
measure of a diesel fuel's ability to prevent wear in these
parts.
|
What
is the cause of deterioration of diesel fuel lubricity? |
|
The lowering of sulfur due to environmental reasons by hydro-
processing leads to removal of certain polar compounds from
diesel which leads to deterioration of the lubricity.
|
What
are lubricity improver additives? |
|
Lubricity additives are oil soluble surface active components
which go rapidly into solution in the fuel and create a lubricating
film by adsorption onto the metal surface and thus restore the
fuel lubricity.
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What
is the chemical nature of lubricity improver ? |
|
The lubricity improvers are organic compounds having a long
hydrocarbon chain
and a polar end group eg. acids, esters, amines, amides, etc.
|
What
should a lubricity improver be capable of ? |
|
The lubricity improver should
| » |
Be excellent lubricity
performer |
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Be effective in improving
lubricity over a wide range of low sulfur fuel. |
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Give harm free characteristics |
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Have good storage stability |
|
What
are the lubricity tests ? |
|
| » |
High frequency reciprocating
test ( HFRR) as per ISO 12156, to ensure restoration of
lubricity by measure of wear scar diameter.
The diesel fuel specification IS:1460 specifies 0.46 mm
(max) as HFRR value. |
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Internal and external harm
tests to ensure field field operability. |
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