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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

GamGram Technical Topics

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-41 + 0.15% DI-EGME

CATEGORY M100

2.0 MG/L STADIS 450 + 15 MG/L DCI-41 + 0.15% DI-EGME + 256 MG/L SPECAID 8Q462

TEST SERIES TO BE RUN

SI NGL E EL EM ENT

FULL SCALE

FUEL HANDLING

SI NGL E EL EM ENT

SINGLE PASS FROM 1 TANK TO ANOTHER

FULL SCALE

RECIRCULA TE

MINIMUM TEMPERATURE

40 DEG F

FUEL TEMPERATURE

MAXIMUM TEMPERATURE

90 DEG F

DEVIATION FROM TEST START TEMPERATURE

+/- 11 DEG F

MAXIMUM CLEAN INITIAL DIFFERENTIAL PRESSURE

6PSIDACROSS FILTER/COALESCERSTAGE,10PSID ACROSS VESSEL

STRUCTURAL STRENGTH OF FILTER/COALESCER ELEM ENTS

75 PSID WITH NO RUPTURE, BYPASSING OF SEALS, OR PINHO LE L EA KS

STRUCTURAL INTEGRITY OF FILTER/COALESCER ELEMENTS

NO MEDIA O R STRUCTURAL DETERIORATION SUCH A S LEAKS OR TEARS

MAXIMUM EFFLUENT

FIBER CONTENT

10 FIBERS PER LITER

CONTAMINANT LEVELS DURING

SOLIDS CONTENT

1.0 MILLIGRAM PER GALLON

TESTS

FREE WATER CONTENT

15 PARTS PER MILLION

CONDITIONING RUN TEST

FLOW RATE

3GPMFORSINGLEELEMENTTEST,30% OF RATEDFLOW FOR FULL SCALE TEST

TEST DURA TI ON

30 MINUTES

WATER COALESCENCE TEST - CLEAN ELEM ENT

FLOW RATE

RATED FLOW

TEST DURA TI ON

30 MINUTES

WATER INJECTION RATE

0.01% BY VOLUME

SOLIDS HOLDING TEST

FLOW RATE

RATED FLOW

TEST DURATION - TYPE S

75 MINUTES

TEST DURATION - TYPES-LD

ADD SOLIDS UNTIL PRESSURE REACHES 22.5 PSID, THEN RUN ADDITIONAL 45 MINUTES WITH NO ADDITION

SOLIDS INJECTION RATE

72 MG/GAL

MAXIMUM DEPTA P AT 50 MINUTES - TYPE S

15 PSID

MAXIMUM PRESSURE AT 75 MINUTES - TYPE S

45 PSID

FLOW RATE

RATED FLOW

WATER COALESCENCE

TEST DURATION - Single Element

1ST PERIOD: 150 MINUTES, 2ND PERIOD: 30 MINUTES

TEST - DIRTY ELEMENT

- Full Scale

1STPERIOD:90MINUTES, 2NDPERIOD:15 MINUTES

WATER INJECTION RATE

1ST PERIOD: 0.01%, 2NDPERIOD: 3.0%

VESSEL LENGTH TO DIAMETER RATIO

VESSEL 24 INCHES

1.75

VESSEL >24INCHES

2.5

MINIMUM SPACING BETWEEN ELEMENTS AND BETWEEN ELEMENTS & VESSEL WALL

0.5 INCHES