Lab Test of Prototype HMMWV Filter Elements Constructed with Spunbond Polyester Media

摘要

Lab test results showed the spunbond polyester media met efficiency requirements but failed the dust capacity/service life requirement. The spunbond polyester media achieved an efficiency of 99.88% which exceeds the required 99. 5%. The spunbond polyester media achieved a service life of 3.4 hours during dust capacity tests. This falls way short of meeting the present specified service life requirement of 20 hours (recently waived to 16 hours in a recent contract). Initial restriction of spunbond polyester media was considered acceptable and only slightly higher in one HMMWV prototype than the two comparison HMMWV production filter elements lab tested. Dust capacity lab test results based on the Army's current test methods and procedures showed the spunbond polyester media would not be considered acceptable for use on military vehicle based on HMMWV air filter test results. Lab test results do not consider vibration effects as would be seen by a filter element installed on a military vehicle. It is not known if spunbond polyester media performance would increase significantly if vibration effects were incorporated during dust capacity tests as measured on vehicle during running.