Jet A-1 Aviation Fuel Specification IS 1571 in India & Its historic Development

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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

Indian JET A–1  AVIATION TURBINE FUELS, KEROSENE TYPE, JET A-1 — SPECIFICATION   Development in India

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
Refrences

    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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