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ABDOO110239 VISTA CHEMICAL COMPANY ABERDEEN PLANT SEPTEMBER 2, 1992 PROCESS HAZARD ANALYSIS FOR VCM TANK FARM COMPRESSOR UPGRADE PROJECT ABDOO110240 VCM TANK FARM COMPRESSOR UPGRADE PROCESS HAZARD ANALYSIS COMPLETION REPORT TABLE OF CONTENTS SUBJECT PAGE I. SCOPE..................................................................................................1 II. TEAM. MEMBERS............................................................................... 2 III. DOCUMENTS UTILIZED............................................................... 3 IV. SUMMARY OF POTENTIAL HAZARDS..................................... 4 V. P&ID 5 t ABDOO110241 VISTA CHEMICAL CO., ABERDEEN PLANT VCM COMPRESSOR UPGRADE - PHA COMPLETION REPORT SEPTEMBER 2, 1992 I. SCOPE This Process Hazard Analysis was completed specifically for the VCM Tank Farm Compressor Upgrade project. This Safety and Health project installs instrumentation and DCS interlocks for the compressors to provide safer operation during VCM unloading. The PHA does not cover the overall operations of unloading VCM from the railcars to the sphere. A separate PHA has already been completed for the unloading operation. The PHA addressed instrumentation failures and reviewed DCS interlocking schemes for the equipment. 1 ABDOO110242 VISTA CHEMICAL CO., ABERDEEN PLANT VCM COMPRESSOR UPGRADE - PHA COMPLETION REPORT SEPTEMBER 2, 1992 II. TEAM MEMBERS The following is a list of the team members assembled to perform the PHA on this project. All are employees of Vista at the Aberdeen plant. NAME TITLE Larry Frye Berlin Genetti Dean Honeycutt Jerry Roberts Joe Shackelford Rory Sneed Jim White General Mechanic "A" Co-op Process Engineer Yard Supervisor Safety Inspector Instrument Technician Senior Process Engineer Project Engineer 2 ABDOO110243 VISTA CHEMICAL CO., ABERDEEN PLANT VCM COMPRESSOR UPGRADE - PHA COMPLETION REPORT SEPTEMBER 2, 1992 III. DOCUMENTS UTILIZED The following documents were made available to each team member prior to and during the PHA. 1. Class "A" Design 2. Piping and Instrumentation Diagram 3. Mechanical Drawings 3 ABDOO110244 VISTA CHEMICAL CO., ABERDEEN PLANT VCM COMPRESSOR UPGRADE - PHA COMPLETION REPORT SEPTEMBER 2, 1992 IV. SUMMARY OF IDENTIFIED POTENTIAL HAZARDS 1. CAUSE: Failure or accidental closing of the VCM vapor valve (00HV103) from the sphere, the liquid VCM valve (00HV102) to the sphere, or the railcar isolation valve (00XV120). CONSEQUENCE: Cavitation or dead-heading of the VCM compressors. This could potentially damage the compressors and subsequently cause a VCM leak. RECOMMENDATIONS: Include the inputs for these valves in the compressor interlocking, such that the compressors are shut down when any of these valves are closed. RESOLUTION: The above recommendation has been implemented into the electrical design and operating procedures. RISK RATING: 4 4 A-ti Oo P617. EMMISSIONS RECOVERY SYSTEM KNOCK OUT POT I SPHERE KNOCK OUT POT ABDOO110245 T fm J___ t+m CTH^CMORJ ISU JATE DESCRIPTION BY . CKD API wtota Vista Polymers V i\J 1 n Aberdeen, MLsstsstpp< VCM TANK FARM COMPRESSOR UPGRADE PU D APP& DATE* SCALD No.