Separation burst resistance

DT-236/PDR-75. NSN 6665-01-211-4217. The AN/PDR-75 provides the capability to monitor and record the exposure of individual personnel to gamma and neutron radiation through a wrist worn device. It is a tactical dosimeter with 1 to 1000 cGy indirect reading for neutron and gamma dose measurement by separate devices. It responds to and measures prompt radiation from nuclear bursts. The PRD-75 will be used to calculate unit radiation status, for medical triage, and for unit reconstitution. Elements are encased in a tamper resistant locket, which is worn on the wrist. Dosages are cumulative and are permanently recorded. 

When the aggregate layer is subjected to loads, significant local stresses are created in the separator. The separator must therefore be of sufficient strength to withstand these stresses. The bursting strength, localised tensile strength properties, and puncture resistance are of specific importance to the separation function. 

Flexible hoses used with liquid carbon dioxide should have a minimum working pressure of 500 psig (3447 kPa) for low temperature operation. They should be reinforced with wire braid and attached to couplings of sufficient strength to resist separation from the hose at pressures below the minimum bursting pressure of the hose. Hose lines must be equipped with pressure relief valves... 

The primary purpose of an automotive battery is to simply start a car engine with a high burst of power. Therefore, SLI batteries are usually rated for their CCAs and the general trend has been toward maximizing the CCAs in a given box or container size or power density per volume. The separator has played an important role in this trend. First, to increase the CCAs, battery manufacturers increased the electrode area, often resulting in reduced thickness of the electrode and separator. Second, to maintain the correct acid ratio to active material, the back-web thickness has decreased from a nominal thickness of 250 pm to as low as 150 pm. Decreasing the back-web thickness has served to lower the separator resistance, which is a part of the overall electrical resistance of the battery. 

Design the geotextile as a separator. This frmction is always required. The survivability design steps just described have direct applicability here. Burst strength, tensile strength, puncture resistance, and impact resistance all have significance in this particular application. 

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