Refining and Petrochemical Company HAZOP Minute Sheet

Project: Crude Distillation Unit

Node: 1

Draw No:1

Node Description: Crude Feed Line and Associated Pipe Work

Guide Word

Cause

Consequence

Safeguards

Recommendation

1. High Flow

1. Crude feed pump 10-P-01AB increased pumping capacity

2. Low level alarm 10-LPA-15 faulty

3. Crude feed flow regulator 10-FR-BI faulty

4. Valve V1 fully opened

5. Water pump 10-P-12AB increased pumping capacity

6. Valve V2 fully opened

7. Valve V3 fully opened

8. Flow controller 10-FRC-11 faulty

1. High ratio of crude to water mixture causing low dissolution of salt from crude oil

2.Increased corrosion and fouling of downstream equipment

3. More water in oil-water mixture causing increased crude conductivity and trips off desalter transformer

1. Frequently check and maintain feed pump

2. Check and maintain feed flow controller

3. Frequent check and maintain water pump

4. Frequent checking of all flow valves and flow lines

2. Low Flow

1. Crude feed pump 10-P-01AB fails

2. Low level alarm 10-LPA-15 faulty

3. Crude feed flow controller 10-FR-BI faulty

4. Valve V1 partially blocked

5. Heat exchanger 10-E-01 tubes partially blocked

6. Water pump 10-P-12AB fails

7. Valve V2 partially blocked

8. Valve V3 partially blocked

9. Flow controller 10-FRC-11 faulty

1. Low crude in oil-water mixture increasing conductivity and consequent tripping off of desalter transformer

2. Less water in oil-water mixture causing poor salt dissolution

3. Fouling and corrosion of downstream equipment

1. Low level alarm comes up

1. Install spare crude feed pump to auto start when feed pump fails

2. Inspect and maintain crude feed flow controller

3. Inspect and maintain feed flow lines and valves

4. Frequent cleaning of heat exchangers tubes

5. Install a spare water pump to auto start when pump 10-P-12AB fails

6. Check and maintain water flow controller and valves

3. No Flow

1. Feed pump 10-P-01AB faulty

2. Valve V1 fully closed

3. Heat exchanger 10-E-01 tubes fully blocked

1. Desalter volume falls and crude oil loss in effluent water

1. Low level alarm comes up

1. Regular checking and maintenance of feed flow lines and valves

2. Install a spare pump to auto start when pump 10-P-12AB fails