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Solutions for maintaining oxygen levels in mixing vessels


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Robert Herrmann, Product Manager, EHS Solutions

Published in: Business, Technology
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Solutions for maintaining oxygen levels in mixing vessels

  1. 1. Maintaining Low Oxygen Concentrations During Open Manway Charging Robert Herrmann - Product Manager
  2. 2. Introduction EHS Solutions LLC Operator Centricity Safety Practical Engineering Controls Efficacy BREIDENSTEIN, GERMANY PEORIA, IL USA (headquarters) Engineered Simplicity
  3. 3. Overview application of inerting technology • The Practice of Manway Charging • Using Inert Gases to Control Oxygen Concentrations • The Importance of Maintaining Proper O2 Levels per NFPA Standard 69 • Introduction of the Nitrogen Purge Hopper • Practical Experience with Open Manway Charging when using this Technology
  4. 4. Charging solids into process tanks Container Types: - Super Sacks - Large Rigid Bins - Drums - Small Bags Delivery Methods: - Overhead Gravity Feed through Product Chute - Vacuum Transfer - Open Manway Charging
  5. 5. Process operational and safety considerations Operational Considerations: - Headspace and Floor-Space - Properties and Flow Characteristics of the Product - Addition Rate of the Product Safety Considerations: - Operator Exposure to Dust and Vapor - Operator Ergonomics - Flammable Atmosphere and Deflagration Risk Photo courtesy of: PEO, Assembled Chemical Weapons Alternatives
  6. 6. Tank 1. 2. 3. 4. 5. 6. 7. 8. overview of process tank dynamics Nitrogen Purging Process (for pressure rated vessels) Solvent Vapor in Headspace Entrained Air with Product Addition (21% oxygen) Venturi Effect of Agitator Nitrogen Addition at Tank Dome O2 Sensor on Tank Dome Vent on Tank Dome Static Discharge within Powder Cloud
  7. 7. Deflagration the fire triangle Static Discharge Solvent Vapor Product Dust
  8. 8. NFPA 69 standard on explosion prevention systems TWO METHODS ON PREVENTION OF COMBUSTION 1. Oxidant Concentration Reduction - Maintain levels of oxidant concentration below the specified Limiting Oxidant Concentration (LOC) 2. Combustible Concentration Reduction - Maintaining combustible concentrations below Lower Flammable Limit (LFL) Consider Proper Housekeeping Techniques NFPA 654 – standard for prevention of fire and dust explosions
  9. 9. NFPA 69-08 application of purge gas at points of use LOC MONITORING PRACTICES 1. Continuous Monitoring of LOC (one of the following must be met): - Safety margin of at least 2 volume percent below the worst credible case LOC shall be maintained - The LOC shall be less than 5 percent in which case the equipment shall be operated at no more than 60% of the LOC 2. Non-Continuous Monitoring of the LOC (both of the following must be met): - The oxygen concentration shall be designed to operate at no more than 60% of the LOC or 40% of the LOC if the LOC is below 5% - The oxygen concentration shall be checked on a regularly scheduled basis
  10. 10. Engineering Control Nitrogen Purge Hopper patent pending -application of purge gas at point of use- Reduce and Maintain Low LOC Control of Addition Rate Reduce Time Tank is Open Dust & Vapor Control Easy & Fast to Clean Safe from Pinch Point Fast Installation/Start-Up Cost Effective
  11. 11. Engineered Simplicity Nitrogen Purge Hopper -containment & inerting-
  12. 12. Time of Day 12:35:30 12:34:00 12:33:00 12:29:00 12:27:30 12:26:00 12:25:00 12:24:00 12:22:00 12:16:00 12:13:30 12:12:00 12:11:00 12:10:30 Tank 12:07:00 12:05:00 12:02:00 12:00:30 11:59:30 7.00 11:58:00 11:55:00 11:53:00 11:51:00 11:49:00 11:47:00 11:44:00 11:42:00 11:38:00 11:36:00 11:30:00 O2 % Engineering Control Nitrogen Purge Hopper -applied technology for effective controlOxygen % vs Time Manway 6.50 6.00 5.50 5.00 4.50 4.00 3.50 3.00
  13. 13. Custom equipment options & features
  14. 14. Conclusion Maintaining Low Oxygen Concentrations During Open Manway Charging • The Practice and Challenges of Charging Solids through an Open Manway • The Risks of Deflagration and Risks of Potential False Monitoring • The Importance of Nitrogen Blanketing and Point Source Inerting in Enclosed Vessels • The Technology behind the EHS Nitrogen Purge Hopper • Common Applications and Variations of the Nitrogen Purge Hopper