ASTM_D_6811_-_02_2007e1.pdf

Designation:D681102(Reapproved 2007)1Standard Test Method forMeasurement of Thermal Stability of Aviation Turbine Fuelsunder Turbulent Flow Conditions(HiReTS Method)1,2This standard is issued under the fixed designation D6811;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTERemoved all instances of the acronym for Jet Fuel Thermal Oxidation Tester editorially in April 2010.1.Scope1.1 This test method covers a laboratory thermal process,3using a specified apparatus for measuring the tendencies ofaviation turbine fuels to deposit insoluble materials and de-composition products,such as lacquers,within a fuel system.This test method provides a quantitative result for fuel underturbulent flow conditions in 65 or 125 min.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4D3241 Test Method for Thermal Oxidation Stability ofAviation Turbine FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationE128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory Use3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 capillary tube,na coated resistively heated stainlesssteel tube through which fuel is pumped and controlled to givea predefined constant fuel exit temperature.3.1.2 deposits,noxidative products,such as lacquers,laiddown predominantly at the fuel exit end(hottest),on the insideof the heated capillary tube.3.1.3 HiReTS,nhigh Reynolds number thermal stability.3.1.4 HiReTS Peak(P)number and Total(T)number,nthequantitative results of the test.3.1.5 tubeways,nplastic and metal tubes through whichfuel flows during cleaning and the test.4.Summary of Test Method4.1 Fuel is pumped,at pressure,through an electricallyheated capillary tube at a constant rate.The heating of thecapillary tube is controlled to maintain a constant fuel tem-perature of 290 6 3C at the exit of the capillary tube.A flowrate of greater than 20 mL/min and the specified capillary boreof less than 0.300 mm ensures that turbulent flow is maintained(see Appendix X1)within the capillary.The formation oflacquers and fuel degradation products act as a thermalinsulator between the cooler fuel and hotter capillary tube,resulting in an increase in temperature of the capillary tubewhich is measured at a number of positions by a contactlesspyrometer.The HiReTS Total(T)number is displayed duringand at the end of the test.The HiReTS Peak(P)number can bedetermined from analysis of the results.5.Significance and Use5.1 The thermal stresses experienced by aviation fuel inmodern jet engines may lead to the formation of undesirableand possibly harmful insoluble materials,such as lacquers,onheat exchangers and control surfaces,that reduce efficiencyand require extra maintenance.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved Nov.1,2007.Published January 2008.Originallyapproved in 2002.Last previous edition approved in 2002 as D681102.DOI:10.1520/D6811-02R07E01.2This test method is being jointly developed with the Institute of Petroleum,where it is designated IP 482.3This process is covered by a patent.Interested parties are invited to submitinformation regarding the identification of an alternative(s)to this patented item tothe ASTM Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,which you may attend.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information15.2 Aircraft fuel systems operate mainly under turbulentflow conditions.Most large-scale realistic test rigs operate inthe turbulent flow regime but fuel volumes are very large andtest times are very long.5.3 This test method test