Specifications and Qualification Procedures

for Aviation Jet Fuel Filter/Separators

EI 1581 5th Edition Specification Summary - Data Sheet #1934

EI 1581 5th Edition Specification* Key Points

  1. Category “C” filter/separators are for use in commercial Jet-A or Jet-A1 fuel. They are tested in fuel containing anti-static additive Stadis 450 and corrosion inhibitor DCI-4A.
  2. Category “M” filter/separators are for use in military JP-8 or JP-5 fuel. They are tested in fuel containing Stadis 450, DCI-4A, and anti-icing additive Di-EGME. (Note: testing to Category “M” also qualifies for Category “C”.)
  3. Category “M100” filter/separators are for use in military JP8+100 fuel. They are tested in fuel containing Stadis 450, DCI-4A, Di-EGME, and thermal stability additive Spec Aid 8Q462.
  4. Type “S” filter/separators are used at filtration points where significant levels of both dirt and water can be expected. (Note: testing to Type “S” also qualifies for both Type “S-LD” and Type “S-LW”.)
  5. Type “S-LD” filter/separators are used at filtration points where significant levels of water but minimal amounts of dirt can be expected.
  6. Type “S-LW” filter/separators can be used for mobile applications where minimal amounts of water can be expected in the jet fuel.
  7. Multi-Stage Systems can be used at all filtration points in addition to filter/separators where additional performance is desired. Multi-stage devices can include upstream pre-filters and downstream water absorbing filters.
  8. The EI specification procedures qualify the entire filter/separator, not just the elements. Strictly speaking, there is no such thing as an EI qualified element. There are only elements that are used in an EI qualified filter/separator.
  9. A filter/separator of similar geometry to the tested vessel can be qualified by similarity providing that a complex set of criteria are met. This is particularly significant in establishing EI qualification for existing equipment in the field. EI Specification 1582** details the similarity specifications that have to be met in order for a filter/separator to be qualified by similarity.
  10. In order for a filter/separator to be accepted as meeting the EI specification, it must be tested to the specification with an official witness designated by the EI committee present. This witness ensures that all procedures are followed per specification and that all test results meet the specification requirements. An official test report is then issued by the EI.

* EI Specification 1581, Fifth Edition, “Specifications and Qualification Procedures for Aviation Jet Fuel Filter/Separators”, July 2002. Addendum 20th Dec. 2006: Added to section 3.2.2.7 – vessel sump design must allow for water drainage – flat sumps are not allowed.

** EI Specification 1582, “Specifications for Similarity For API/IP 1581 Aviation Jet Fuel Filter/Separators”, February, 2001

 

EI SPEC 1581

 

FILTER/SEPARATOR SPECIFICATIONS

MAJOR MECHANICAL, TEST, & PERFORMANCE REQUIREMENTS

Criteria
Specification Requirement
Test Fuel Additives
Category C
1.0 mg/l STADIS 450 + 15.0 mg/l DCI-4A
Category M
2.0 mg/l STADIS 450 + 15 mg/l DCI-4A + 0.15% DI-EGME
Category M100

2.0 mg/l STADIS 450 + 15 mg/l DCI-4A + 0.15% DI-EGME +

256 mg/l SPEC AID 8Q462

Test Series To Be Run
Single element
Full scale
Fuel Handling
Single Element
Single pass from 1 tank to another
Full Scale
Recirculate
Fuel Temperature
Minimum Temperature
40°F
Maximum Temperature
90°F
Deviation From Test Start Temperature
+/- 11°F
Maximum Clean Initial Differential Pressure
6 psid across filter/coalescer stage, 10 psid across vessel
Structural Strength Of Filter/Coalescer Element
75 psid with no rupture, bypassing of seals, or pinhole leaks
Structural Integrity Of Filter/Coalescer Element
No media or structural deterioration such as leaks or tears
Maximum Effluent Contaminant Levels During Tests
Fiber Content
10 fibers per liter
Solids Content
1.0 milligram per gallon
Free Water Content
15 parts per million
Conditioning Run Test
Flow Rate
3 gpm for single element test, 10% of rated flow for full scale test
Test Duration
30 minutes
Water Coalescence Test - Clean Element
Flow Rate
Rated flow
Test Duration
30 minutes
Water Inection Rate
0.01% By volume
Solids Holding Test
Flow Rate
Rated flow
Test Duration - Type S
75 minutes for single element, 45 min for full scale
Test Duration - Type S-LD
Add solids until pressure reaches 22.5 psid, Then run additional 45 minutes with no addition
Solids Injection Rate
72 mg/gal
Maximum Delta P At 50 Minutes - Type S
15 psid
Maximum Pressure At 75 Minutes - Type S
45 psid
Water Coalescence Test - Dirty Element
Flow Rate
Rated flow
Test Duration - Single Element
1st period: 150 minutes, 2nd period: 30 minutes
Test Duration - Full Scale
1st period: 90 minutes, 2nd period: 15 minutes
Water Injection Rate
1st period: 0.01%, 2nd period: 3.0% (0.5% For S-LW)
Vertical Vessel Length To Diameter Ratio
Vessel ≤ 24 Inches
1.75
Vessel > 24 Inches
2.5
Minimum Spacing Between Elements And Between Element & Vessel Wall
0.5 inches

To upgrade your filter separators to EI 1581 5th Edition, please download and complete the following form:

Velcon Similarity Certificate Form #1728

EI 1581: formerly known as "API 1581", "API/IP 1581", and "API/EI 1581"