No.8 / EXPLANATION API/IP 1581 5th EDITION / NOV. 1975 (Revised September, 2004)

No.8 EXPLANATION API/IP 1581 5th EDITION NOV. 1975 - Revised September 2004

Note: By permission of Velcon Filters, Inc., we have reprinted their Data Sheet No. 1934 because it provides an excellent summary of the entire 5th Edition. See GamGram No. 9 for further explanation and our comments.

API/IP 1581 5th Edition Specification* Key Points

• 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.

• 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.

• 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.

• Type "S" filter/separators are used at filtration points where significant levels of both dirt and water can be expected.

• Type "S-LD" filter/separators are used at filtration points where significant levels of water but minimal amounts of dirt can be expected. (Note: Testing to Type "S" qualifies for both Type "S" and Type "S-LD".)

  

• 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.

• The API specification procedures qualify the entire filter/separator, not just the elements. Strictly speaking, there is no such thing as an API qualified element. There are only elements that are used in an API qualified filter/separator.

• 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 A.P.I. qualification for existing equipment in the field. API/IP Specification 1582** details the similarity specifications that have to be met in order for a filter/separator to be qualified by similarity.

• In order for a filter/separator to be accepted as meeting the API specification, it must be tested to the specification with an official witness designated by the API 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 API.

* API/IP Specification 1581, Fifth Edition, "Specifications and Qualification Procedures for Aviation Jet Fuel Filter/Separators", July 2002 
** API/IP Specification 1582, "Specifications for Similarity For API/IP 1581 Aviation Jet Fuel Filter/Separators", February, 2001

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