Document pmd17MEyd8ax8BjJyKr4bj4xw

I VENT RELIEF SYSTEMS 1, RESULTS OF SURVEY 2, METHODS OF RELIEF SYSTEM SIZING 3, QUESTIONS & DISCUSSION Glen D, Schaaf Oct,, 1980 NGC 23244 SUMMARY OF SURVEY I. OVERPRESSURE PROTECTION PRIMARY RELIEF SYSTEMS - MOST PVC REACTORS ARE FITTED WITH RUPTURE DISK - RELIEF VALVE COMBINATIONS - ALL PRIMARY RELIEF SYSTEMS DISCHARGE TO THE ATMOSPHERE - MANY REACTORS HAVE MULTIPLE RELIEVING SYSTEMS - ALMOST 100% OF THE POLYMERIZERS HAVE MANUAL VENTS - SOME MANUAL VENTS DISCHARGE TO THE ATMOSPHERE - GAS HOLDERS RECOVERY - ONLY A FEW COMPANIES HAD BLOCK VALVES PRECEEDING THE RUPTURE DISK OR RELIEF VALVE II. SIZING OF RELIEF SYSTEMS - TOTAL RELIEF AREA AVAILABILITY (CALCULATED ON NOZZLE SIZE) VARIED FROM A MIN, OF 1.57 TO A MAXIMUM OF 12,56 SQUARE INCHES PER 1,000 GAL, OF REACTOR CAPACITY - SMALL REACTORS 1,000 - 5,000 GALS. = 2 - 6 SQ, IN, 1,000 GAL, - LARGE REACTORS 6,000 - 35,000 GALS, 5 - 12.56 SQ, IN, 1,000 GAL, NGC 23245 III. OVERPRESSURE PREVENTION - MANY REACTORS HAVE A RELIEF SYSTEM THAT CAN BE ACTIVATED EITHER AUTOMATICALLY OR MANUALLY - A FEW OF THESE SYSTEMS DISCHARGE TO THE ATMOSPHERE - BUT MANY DISCHARGE TO GAS HOLDERS - SOME TO RECOVERY AND SOME TO CLOSED TANKS - ALMOST 100% HAVE A SHORTSTOP SYSTEM - MOST FEEL IT IS EFFECTIVE. SHORTSTOP CAN BE INJECTED EITHER MANUALLY OR AUTOMATICALLY - ALL HAVE RECOVERY SYSTEMS AVAILABLE FOR RUN-AWAY BATCHES - MOST HAVE SOME METHOD OF DISCHARGING LIQUID TO PREVENT FAILURES DUE TO HYDROSTATIC CONDITIONS IV, METHODS TO HANDLE A RUNAWAY BATCH - COOLING - ADD WATER - OPERATOR INVOLVEMENT - ADD SHORTSTOP - VENT TO RECOVERY - GAS HOLDER - OR EMPTY VESSEL - MANUALLY VENT REACTOR - USE OF RUPTURE DISK & RELIEF VALVE TO VENT TO ATMOSPHERE NGC 23246 V, SIZING OF RELIEF SYSTEMS - ASME CODE FOR UNFIRED PRESSURE VESSELS - 100% VCM - FIRE CONDITION -.REACTION EXOTHERM AND NO COOLING - VCM VAPORIZATION RATE REQUIRED TO REMOVE HEAT OF REACTION-AT RELIEVING TEMPERATURE TIMES TWO. VAPOR FLOW WITH NO BACK PRESSURE - FACTORY MUTUAL DATA SHEET EMERGENCY VENTING OF VESSELS - BOYLES PAPER - MONSANTO FORMULA MAX. RATE OF REACTION AT TEMPERATURE EQUIVALENT TO PRESSURE OF RELIEF SYSTEM - CORRECT REACTION KINETICS FOR THE TYPE OF PVC PRODUCED COMBINED WITH A VALID EQUATION FOR HANDLING A MULTIPHASE FLOW THROUGH THE RELIEVING SYSTEM - SIMULATE LOSS OF COOLING, DETERMINE RELIEF REQUIRED CONSIDERING REACTOR KINETICS AND MULTIPHASE RELIEF FLOW. SIZE RELIEF SYSTEMS TO KEEP MAX. PRESSURE BELOW ASME CODE LIMITS, NGC 23247 REGolas 9/18/80 Rupture Disk Nominal Size (in.) Flow Area (in.^) 3 7.393 4 12.73 6 28.89 8 50.03 Relief Valve* Nominal Size (in.) Flow Area (in.2) 3X4 1.287 2.853 4X6 6.38 6X8 6 X 10 11.05 16.00 8 X 10 26.00 * Largest orifice size for that size valve. NGC 23248 COMPANY AND LOCATION 1. 2. ?. 4. 5. 6. 7. 8. 9. 10. POLY SIZE GAL 1,100 2,500 9,300 4,300 16,500 2,000 4,000 4,000 6,000 2,400 3,500 4,000 6,000 24,000 24,000 20,000 FVC POLY SIZE RELIEF AREA CQMPARISION RATING PSIG 200 RELIEF NOZZLE S I ZE 2" NUVEER 1 200-400 4" 1 250 4" ]. 300 4" 1 240-300 10" 1 .180 3" 180 3" 1 1 200 4" 200 4" 1 1 200 185-200 4" 4" 1 1 200 4" 220 4" 200 18 M 180 16" 1. 1 1 1 260 16" 1 TOTAL AREA AVAILABLE 3.14 12.56 12.56 12.56 78.5 7.07 7.07 12.56 12.56 12.56 12.56 12.56 12.56 254.34 200.96 200.96 RELIEF AREA PER 1000 GAL 2.85 5.02 3.81 2.9 4.75 3.53 1.77 3.64 2.09 5,2 3.5 3.14 2.09 10.59 8.37 10.05 Kj Ui K> NGC 23250 PVC POLY SIZE RELIEF AREA COMPARISON COMPANY AND LOCATION POLY SIZE GAL RATING PSIG RELIEF NOZZLE SIZE NUMBER 11 . .35,000 172 8" 2 12. 35,000 185 8" 2 6" 2 11. 2,200 200 4" 1 5,000 225 6" I 7,000 200 6" 1 20,000 225 8" 2 14. 3,500 300 6" 1 7,400 250 6" 1 15. 4,200 200 4" 1 5,700 200 4" ]. 4,500 200 3" 1 15. 3,700 5,200 17,000 200 4" 200 6" 165 8" x 12" I 1 2 17. 20,000 200 6' 2 8" 1 Note: Total relief area is based cn full nozzle size for canpariscn and does not include the reduction of area if a relief valve is used. 2376E/wp/4 TOTAL AREA AVAILABLE 100.48 157 12.56 28.26 28.26 100.48 28.26 28.26 12.56 12.56 7.07 12.56 28.26 213.52 .1.07.16 RELIEF AREA PER 1000 GAL 2.87 4.49 5.71 5.65 4.04 5.02 4.07 3.82 2.99 2.20 1.57 3.39 5.43 12.56 5.34 Recent Regulatory Action Related to Vinyl Chloride/PVC 9/29/80 OSHA Carcinogen Policy Issued 22 January Candidate list of 250 issued August 11 Priority lists due next In litigation, courts have ruled it a standard, but retained in 5th circuit. Benzene standard overturned - requires some proof of need. No comment on cost benefit. Coke oven case withdrawn, cotton dust standard review granted. Rate Retention Lead standard upheld Medical Records Access Issued 23 May. Exposure and health data Litigated by La. Chem. Assn. Fire Brigade Standard Issued 12 September Walk-Around Pay Remanded by courts Labeling Proposal past due Refusal of Inspection Court cases mixed OSHA proposed ex parte warrants General Duty Citations None known in PVC/VC industry, but used in others Women in Work Place Am. Cyanamid charges dismissed. Bunker Hill charged DOL/EEOC proposal on reproductive hazards - comment period over Reopening of Standard NI0SH/0SHA Symposium at Bethesda in March Strong effort to implicate similar compounds and PVC dust, but no new data. Maltoni data showed NOEL Project officer assigned Carcinogen Policy Hearings in March Two-track activity - Scientific principles and 6 candidates under review by SAB - Using philosophy in VC, radio nuclides, water quality criteria, labeling, etc. Record still open Carcinogen list released (150/100) NGC 23251 EPA (cont'd) Vinyl Chloride Revisions Five-year review underway by TRW EPA still says depends on carcinogen policy decision Emergency Releases major issue General Fugative Emissions Rule Due soon - similar to VC Labeling Proposal due soon List released (100) Water Quality Criteria No further action RCRA Now effective - manifest system Many chlorinated materials listed Reactor scraps due to be listed in November DOT Identification System Adopted - VC = UNI 086 Retrofit of Tank Cars HM-175 would bring 105 cars up to same standard as 112 type Hazardous Wastes Memo of Agreement with EPA - Proposals in May 22 FR FDA No action on PVC packaging. Monsanto/Acrylo decision prompted SPI to reapply for liquor bottles. NCI Phthalates and adipates found carcinogenic in rodents IRLG Agencies Agreement for cross-inspection by agents V NGC 23252 DTO Plants r,vL blo i L.B. Henr v PT-ALE Niagara & LVL-LPA PT-LPA Convent COMPEITl'ORS Key nor Gen Ti re FVC Plant Air Products Georgia Pacific Sh.intech * Qn KJ U> ui UJ POLY SIZE GAL 1,100 2,500 3,300 4,300 16,500 18,600 39,600 2,000 4,000 4,000 6,000 2,400 3,500 4,000 6,000 24,000 24,000 20,000 35,000 FVC POLY SIZE RELIEF AREA GOMPARISION RATING PSIG 200 RELIEF NOZZLE SIZE 2" NUMBER 1 200-400 250 4" 4" 1 1 300 4" 1 240-300 240 -- 10" 12" 18 & 16 1 1 2 180 180 200 200 200 185-200 200 220 200 180 260 172 3" 3" 4" 4" 4" 4" 4" 4" IS" 1 16" 36" 8" .1 1 1 1 1 ]. .1 1 1 1 1 2 TOTAL AREA AVAILABLE 3.14 12.56 12.56 12.56 78.5 113.04 455.3 7.07 7.07 12.56 12.56 12.56 12.56 12.56 12.56 254.34 200.96 200.96 100.48 RELIEF AREA PER 1000 GAL 2.85 5.02 3.81 2.9 4.75 6.08 11.49 3.53 1.77 3.64 2.09 5.2 3.5 3.14 2.09 10.59 0.37 10.05 2.87 IDMPETn'OlS (COOT.) Tenneco or Firestone Diamond Ethyl PW3 - Company POLY SIZE GAL 35,000 2,200 5.000 7.000 20,000 3,500 7,400 4,200 5,700 4,500 PVC POLY SIZE RELIEF AREA OQMPARISION rating psig 185 200 225 200 225 300 250 200 200 200 RELIEF NOZZLE SIZE 8" 6" 4" 6" 6" 8" 6" 6" 4" 4" 3" number 2 2 1 1 1 2 1 1 1 1 1 TOTAL AREA available 157 12.56 28.26 28.26 100.48 28.26 28.26 12.56 12.56 7.07 RELIEF AREA PER 1000 GAL 4.49 5.71 5.65 4.04 5.02 4.07 3.82 2.99 2.20 1.57 9O to u to 4O^k ,'otes TOtal relief area is based on full nozzle size for comparison and does not include the reduction of area if a relief valve is used.