Fired heater hydromechanical decoking questionnaire

Please fill this questionnaire online. Fields marked with an asterisk are required.

1. General data

1.1 Client (company name)

1.2 Contact person

1.3 E-mail

1.4 Phone

1.5 Unit name / fired heater reference number, start of operation year

1.6 Nearest shutdown date / requested job commencement date

1.7 Refining process name

2. Decoking history

2.1 How often the heater stops for decoking

2.2 Last stop / decoking date

2.3 What method had been used for decoking?

2.4 Satisfaction level from the last decoking (your assessment)

2.5 How often and how many tubes have been damaged and replaced during the last 2 stops?

3. Operating data

3.1 Skin tube temperature, °C (convection / bridgewall / radiant section, before shutdown and after start-up)

3.2 Pressure at inlet, bar

3.3 Pressure at outlet, bar

4. Heater tubes

4.1 Heater tube metallurgy

4.2 Number and length of pipes in convection section (per pass: pipe length, m; ID × wall thickness; number of tubes; bend ID × wall thickness)

4.3 Number and length of pipes in radiant section (per pass: pipe length, m; ID × wall thickness; number of tubes; bend ID × wall thickness)

4.4 Pipes recombination / branching, Y-connection, etc. — please describe

4.5 Pipes placement

4.6 Convection inlets and radiant outlets height above ground (per pass)

4.7 Connection point pipe and flange rating and diameter

4.8 Bend type (U-bend, box header, plug header); heater one side / both sides

5. Coke and mechanical condition

5.1 Presence of piping thinning, ovality, dents, bending, pipe inserts with ID different from the whole pass — describe

5.2 Assumed coke build-up location along the piping system and its thickness (from previous visual observation)

5.3 Presence of thermocouples, welding seams, supporting rings or any other mechanical obstacles

6. Utilities

6.1 Type of water supply, available flow rate and pressure

6.2 Distance from heater to water supply point (fire hydrant)

6.3 Distance from heater to sewage point

7. Additional info

7.1 Any comments the client believes valuable for successful decoking

7.2 Special operating conditions, if any

7.3 Attach heater coil tube scheme(s) with section views and specs

7.4 Attach piping scheme at convection inlets and radiant section outlets