PMC Alarm Diagnostics for ISD/PMC and PMC Only Configurations VP PRESSURE
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VP PRESSURE
The processor over-pressure test occurs at daily intervals at the daily assessment time after at least 1-day's UST
ullage vapor pressure data has been collected. A VST ECS Membrane Processor failure occurs when the 90th
percentile of 1-day's ullage pressure data (i.e. 10% of the pressure data) is equal to or exceeds 1" wc. A Veeder-
Root Polisher failure occurs when the 90th percentile of 1-day's ullage pressure data (i.e. 10% of the pressure
data) is equal to or exceeds 2.3" wc. A failure of the processor over-pressure test will result in a warning and
warning event recording. Two consecutive 1-day periods of processor over-pressure test failures will result in a
failure alarm, failure event recording, and shutdown of the site.
ISD MONITORING CATEGORY
Vapor Processor Monitoring is responsible for ensuring that the vapor processor is operating within normal
parameters with no risk of releasing excessive HC effluent emissions.
DIAGNOSTIC PROCEDURE
• For a VST ECS Membrane Processor, refer problem to the processor manufacturer certified technician. For a
Veeder-Root Polisher, perform the operability tests as outlined in Exhibit 11 of VR 203/ VR 204.
• Refer to the Clear Test Repair Menu (on page 36) for clearing this alarm on the TLS after repairs are complete.
FIELD NOTES
• This warning will not appear on a Healy EVR system.
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