Jet A-1 Aviation Fuel Specification IS 1571 in India & Its historic Development
Jet A-1 Aviation Fuel Specification IS 1571 in India & Its historic Development
The first Indian Standard IS – 1571 Jet A-1 specification published in 1960 was based on British Ministry of Defence Specification D.E.R.D. 2482/2494, it covered two grades K-40 and K-50. Since then Nine Revisions have been published till date and latest Revision is now align with UK DEF STAN 91-91 Issue 7 of 2011- amendment 3, 2015 and also to include the Government of India Defence requirements of Silver Strip corrosion. Assistance has also been derived from ASTM D 1655-15c, Aviation Fuel Quality Requirements for Jointly Operated System (AFQRJOS-Issue 28 March 2015).
The need for International coordination among recognized standard of
other countries on the subject is particularly significant for the product of
this type since re-fueling of aircraft in different countries is often involved
IS No.
|
Salient Features
|
Ref.
Std.
|
IS:
1571:1960
|
Two Grades were covered,
namely K 40 & K 50
|
DERD 2482/2494
|
1st Revision 1965
|
Requirement of WSI, Smoke
Point, & Thermal Stability included.
Requirement of ROE, Calorific Value, Accelerated Gum & Mercaptan aligned with DERD2494.
|
Latest Issue DERD 2494
|
2nd Revision 1967
|
Requirement of Silver Strip included &WSI replaced With WSIM
|
(Issue
3 &
5)
|
3rd Revision
1976
|
Grade K-40 deleted, being
no longer used. Requirement of Acidity, Relative Density & Viscosity
aligned with DERD
|
DERD 2494
(Issue
7)
|
4th Revision
1982
|
Aromatics contents
increased from 20 to 22% Thermal Stability by JEFTOT introduced, alignment
with DERD
|
DERD
2494
(Issue 8)
|
5th Revision
1985
|
Sulphur
Contents relaxed from 0.20 to 0.30%Max. Freezing Point relaxed from – 50 to –
47ºC. FBP modified from 288 to 300ºC.
Oxidation Stability
deleted. Hydrogen contents & Conductivity added introduced
|
DERD2494
(Issue
9)
|
6th Revision
1992
|
Silver Strip Corrosion
relaxed i.e. 1 at refinery at Delivery end (4 Hrs). Defence Requirement of
Aromatics 20 max. deleted.
|
DERD 2494
(Issue
10)
|
7th Revision 2001
|
Lubricity requirement
introduced 0.85mmMax. Aromatics revised to 25 %. WSIM modified as MSEP
with/without SDA .Lumino number deleted
|
DEF
STAN
(Issue 2)
|
8th Revision 2008
|
Conductivity is revised,
Olefins is deleted, Silver
strip corrosion classification deleted ,Particulate
contamination is added
|
DEF STAN
(Issue 5)
amendment 2 of 2007
|
9th Revision 2017
|
Particulate at point of manufacture, Cumulative
channel particle count, Silver strip corrosion classification reintroduced,
Information on quality assurance of Jet fuel ( Annex E ), foot note no. 19 on
electrical conductivity added.
|
DEF STAN
(Issue 7)
amendment 3 of 2015
|
Compiled by R J Patel
1) BIS specification IS 1571 for Jet A-1
2) ASTM specification D 1655 for Jet A-1
3) Def Stan 91 - 91 for Jet A-1
4) AFQRJOS specification for Jet A-1
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