GT-5_Ammonia_Delivery_Procedures_GT5-05.docx
DOCX document 79 KB Posted
- Solicitation number
- 2023-IFB-MS-634
- Issued by
- Los Angeles County, California
About this file
This document is a Standard Operating Procedure (SOP) for 19% Ammonia Delivery Procedures at the Pasadena Water & Power Glenarm Power Plant, detailing precise operational protocols for ammonia tank filling and safety management. The procedure covers three primary phases: pre-delivery preparation, ammonia delivery process, and post-delivery procedures, with comprehensive step-by-step instructions for operators and delivery personnel. The process involves multiple critical safety checks, including valve alignments, indicator light verifications, confined space entry permits, personal protective equipment requirements, and specific operational steps for safely receiving and managing ammonia deliveries.
The document extensively outlines safety protocols and hazard mitigation strategies, emphasizing chemical exposure risks, personal protective equipment specifications, and confined space entry guidelines. Key safety measures include mandating specific protective clothing (impervious materials, boots, gloves), requiring eyewash and safety shower availability, specifying respiratory protection requirements, and establishing strict monitoring procedures for atmospheric conditions and potential chemical hazards. The procedure is specifically designed for managing 19% ammonia deliveries to the GT-5 tank (AST-TNK-1010) at the Glenarm Power Plant, which is part of a Selective Catalytic Reduction (SCR) system for controlling nitrogen oxides emissions in the plant's five natural gas-fired combustion turbines.
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Pasadena Water & Power Glenarm Power Plant
Glenarm Power Plant Standard Operating Procedures GT-5 Glenarm GT5-05 19% Ammonia Delivery Procedures to GT-5 Tank AST-TNK-1010
Prior to Ammonia Delivery:
1. Ensure the fill valve on the GT-5 19% ammonia tank is open.
2. Ensure the vapor return valve on the GT-5 19% ammonia tank is open.
3. Ensure the 3-way fill valve (5-AST-DV-1007-1) is aligned to GT-5 tank.
4. Verify that the indicator light for fill is showing GREEN.
5. Ensure the 3-way vapor return valve (5-AST-DV-9008-1) is aligned to GT-5 tank.
6. Verify that the indicator light for vapor return is showing GREEN.
7. Ensure the valve for the ammonia drain pot discharge line is open at the tank.
8. Prepare confined space entry permit.
NOTE: Please verify that the 3M GVP-404 Cartridge used on PAPR is not expired.
9. Ammonia pit entry must be in compliance with NH3 pit JSA (Attached: Appendix A).
10. Ensure the drain pot drain valve is closed.
11. Ensure the recirc line from 19% ammonia pump discharge to drain line is closed.
12. Open the 19% ammonia return pump discharge valve.
13. Open the 19% ammonia return pump suction valve.
14. Open the 19% vapor return line low point drain valve.
15. Open air supply to 19% ammonia return pump to start pump.
16. Run pump until vapor return line is completely drained.
17. Secure 19% vapor return line low point drain valve.
18. Open the 19% fill line low point drain valve.
19. Open air supply to 19% ammonia return pump to start pump.
20. Run pump until fill line is completely drained.
21. Secure 19% fill line low point drain.
22. Secure 19% ammonia return pump suction and discharge valves.
23. Egress from confined space.
Ammonia Delivery:
1. Delivery is to be conducted in accordance with the ammonia delivery company’s established written procedures (Attached: Appendix B).
2. Station one operator at GT-5 19% ammonia tank to verify level and check for leaks etc. while offloading ammonia.
3. Station second operator at ammonia unloading station with delivery driver.
4. Switch Glenarm monitor screens to cameras 18 and 20.
5. Walk driver through system/discuss safety features: emergency shutdown procedures, location of safety shower/eyewash station, location of the 3-way valves and indicator lights.
6. Verify that shower and eyewash station are operational.
7. Cordon off delivery piping and truck with tape.
8. Ensure ammonia being delivered concentration is 19%.
9. Unlock 19% fill and vapor return connection valves.
10. Ensure driver attaches grounding strap to delivery truck.
11. Make announcement to all hands that ammonia delivery has started.
12. Ensure non-essential personnel are clear from unloading area during offload.
13. Give driver OK to start filling 19% ammonia tank.
14. Monitor trenches for ammonia leaks during the duration of offload.
15. Secure filling immediately in the event of a leak.
16. Secure filling immediately in the event of a high-high audible or visual alarm.
17. Secure filling immediately if tank level in the 19% ammonia indication reaches 95%.
18. Upon completion of offload secure and lock 19% unloading station connection valves
After Delivery is Complete:
1. Re-enter ammonia pit in compliance with NH3 pit JSA.
2. Ensure the recirculating line form 19% ammonia pump discharge to drain line is closed.
3. Open the 19% ammonia return pump discharge valve.
4. Open the 19% ammonia return pump suction valve.
5. Open the 19% vapor return line low point drain valve.
6. Open air supply to 19% ammonia return pump to start pump.
7. Run pump until vapor return line is completely drained.
8. Secure 19% vapor return line low point drain valve.
9. Open the 19% fill line low point drain valve.
10. Open air supply to 19% ammonia return pump to start pump.
11. Run pump until fill line is completely drained.
12. Secure 19% fill line low point drain.
13. Secure 19% ammonia return pump suction and discharge valves.
14. Egress from confined space.
References: GT-5 P&ID drawing #PWPG-5-DW-AST-302-001, GT-3&4 F&ID drawing #20001-090 and #20001-P-006-02
Job Hazard Analysis
Hazards Hazard Descriptions Hazard Control Measures Chemical A chemical that exposes a person by absorption Personal Protective Equipment (PPE)-eyewash (Toxic) through the skin, inhalation, or through the blood fountain and safety shower should be available
| stream that causes illness, disease, or death. | in the work area. Wear impervious protective | |||
| The amount of chemical exposure is critical in | clothing, including boots, gloves, lab coat, apron | |||
| determining hazardous effects. Check Safety Data | or coveralls, as appropriate, to prevent skin | |||
| Sheet (SDS) for chemical hazard information. | Contact. Neoprene and nitrile rubber are | |||
| recommended materials. |
| Eye Protection-tight fitting chemical safety and | |
| splash-proof googles and/or a splash-proof face | |
| shield must be worn if there is a likelihood of | |
| exposure. Persons subject to ammonia exposure | must not wear contact lenses. |
| Respiratory Protection-unless ventilation is |
| adequate to keep airborne concentrations below |
| the exposure standard, wear approved respiratory |
| protection such as an ammonia canister mask or |
| an approved air supplied respirator (PAPR). |
| Chemical | A chemical that, when it comes into contact with Personal Protective Equipment (PPE)-eyewash | |||
| (Corrosive) skin, metal, or other materials, damages the | fountain and safety shower should be available | |||
| materials. Acids and bases are examples of | in the work area. Wear impervious protective | |||
| corrosives. | clothing, including boots, gloves, lab coat, apron | |||
| or coveralls, as appropriate, to prevent skin | ||||
| Contact. Neoprene and nitrile rubber are | ||||
| recommended materials. |
| Eye Protection-tight fitting chemical safety and | |
| splash-proof googles and/or a splash-proof face | |
| shield must be worn if there is a likelihood of | |
| exposure. Persons subject to ammonia exposure | must not wear contact lenses. |
| Respiratory Protection-unless ventilation is |
| adequate to keep airborne concentrations below |
| the exposure standard, wear approved respiratory |
| protection such as an ammonia canister mask or |
| an approved air supplied respirator (PAPR). |
Confined Space Toxic atmosphere due to the presence or ingress Confined Space Entry Permit-entry supervisor
| of hazardous substances. Oxygen deficiency, must completely fill out the permit, reviewed by | ||
| oxygen enrichment, flammable or explosive entrants and posted near the permit-required | ||
| atmosphere, flowing liquid or free flowing solids, confined space’s entrance. Entry must comply with | ||
| excessive heat. | all provisions of the facility confined space entry | |
| program. When applicable, systems shall be secured | ||
| in accordance with PWP LOTO/Hold Card Policy | ||
| procedures. Air monitoring for oxygen, flammables, | ||
| hydrogen sulfide, ammonia, etc. must be conducted | ||
| prior to entry by the entry supervisor. Monitoring | ||
| for ammonia shall be performed using the Dräger | ||
| ammonia monitoring device. Adequate forced air |
ventilation must be provided at point of entry.
| Personal Protective Equipment (PPE)-entrants | ||
| must don the waist belt portion of powered air | ||
| purifying respirator (PAPR) prior to entry. All | ||
| extraction equipment and harnesses that will be | ||
| used are required to be inspected and readied prior | ||
| to entry. Entrants must wear full body harness | ||
| with front and rear D rings. The entrant will attach | ||
| the extraction lifeline to the “D” clip on the full body | ||
| harness prior to breaking the plane of entry. | ||
| Entrants must carry personal aqueous ammonia | monitor at all time while in the confined space. |
Version 08/24/16 Page | 4 image1.png
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