HAZOP Example Furnace

HAZOP Worksheets Project Title: Group No.: Date: Drawing No. and Revision: Node No.: Node Description: Design Intent: Item

Guide Word

1

1

1 No Flow

1

1

2

1

1

3

1

2

1

2

"Project title should be the same as the project title in your drawings" Group 13 31/Mar/2015 "P&ID drawing number and Revision". Example: P-0005 (SHT 1 of 3), Rev. 1 1 Example: Furnace F-100 includes coil from oil inlet (before flow measurement) to vapour outlet (after tempe Example: Liquid oil flows from the feed line is heated in the furnace. Oil is vaporize, superheat and transfer Deviation No oil flow

Possible Causes

Consequences

1) Supply failure 2) FCV-100 failed to open

Vaporizer coil overheats and may fail

1) Plugging of coil 2) Blockage downstream of vaporizer

1) Oil in vaporizer will boil 2) Possible overheating and coking of heating coil

No natural gas flow

1) Supply failure 2) PRV-100 failed to open

Flame out in furnace causing unvaporized liquid oil fed to the process

1 More Flow

More oil flow

1) Oil delivered at higher pressure 2) Failure of flow controller FC100 3) Wrong set point of FC-100

May overload vaporizer, resulting in insufficient heating of oil stream, causing failure to vaporise or superheat oil. Oil with low temperature delivered to process

2

More natural gas xxx flow

xxx

Page 1 of 8

HAZOP Worksheets Project Title: Group No.: Date: Drawing No. and Revision: Node No.: Node Description: Design Intent: Item

Guide Word

1 1 1

3 3 3

1 Less Flow 2 3

1

4

1 Reserved Flow

1

5

1 High Pressure

1

6

1 Low Pressure

1

7

1 High Temperature

1

8

1 Low Temperature

1

9

1 High Level

1

10

1 Low Level

"Project title should be the same as the project title in your drawings" Group 13 31/Mar/2015 "P&ID drawing number and Revision". Example: P-0005 (SHT 1 of 3), Rev. 1 1 Example: Furnace F-100 includes coil from oil inlet (before flow measurement) to vapour outlet (after tempe Example: Liquid oil flows from the feed line is heated in the furnace. Oil is vaporize, superheat and transfer Deviation

Possible Causes

Page 2 of 8

Consequences

HAZOP Worksheets

1

ent) to vapour outlet (after temperature control) and natural gas to burners vaporize, superheat and transfer oil vapour to the process. Safeguards

Recommendations

Party Responsible Consultant

1) Low flow alarm (FAL-100) is provided 2) High temperature trip (TSH-100) is provided

Safeguard depends on quick operator response. Consider low flow element (FE-100) to close main burner valve (TCV-100)

Same as Item 1.1.1

Consider procedures to check for blockage and the ease of cleaning the coil

Client

None

1) Consider providing low flow alarm on natural gas line 2) Investigate the effect of liquid oil on the process 3) Consider interlocking the furnace flame out signal with closure of FCV-100 4) Consider providing a low oil outlet temperature alarm

Consultant

None

1) Check capability of FCV-100 to control flow of oil at higher pressure 2) Consider provideing a low oil outlet temperature alarm

Consultant

xxx

xxx

Page 3 of 8

HAZOP Worksheets

1

ent) to vapour outlet (after temperature control) and natural gas to burners vaporize, superheat and transfer oil vapour to the process. Safeguards

Recommendations

Page 4 of 8

Party Responsible

HAZOP Worksheets Project Title: Group No.: Date: Drawing No. and Revision: Node No.: Node Description: Design Intent: Item

Guide Word

2 2 2

1 1 1

1 No Flow 2 3

2 2

2 2

1 More Flow 2

2 2

3 3

1 Less Flow 2

2

4

1 Reserved Flow

2

5

1 High Pressure

2

6

1 Low Pressure

2

7

1 High Temperature

2

8

1 Low Temperature

2

9

1 High Level

"Project title should be the same as the project title in your drawings" Group 13 31/Mar/2015 "P&ID drawing number and Revision". Example: P-0005 (SHT 1 of 3), Rev. 1 2 xxx xxx Deviation

Possible Causes

Page 5 of 8

Consequences

HAZOP Worksheets Project Title: Group No.: Date: Drawing No. and Revision: Node No.: Node Description: Design Intent: Item 2

10

Guide Word

"Project title should be the same as the project title in your drawings" Group 13 31/Mar/2015 "P&ID drawing number and Revision". Example: P-0005 (SHT 1 of 3), Rev. 1 2 xxx xxx Deviation

Possible Causes

1 Low Level

Page 6 of 8

Consequences

HAZOP Worksheets

1

Safeguards

Recommendations

Page 7 of 8

Party Responsible

HAZOP Worksheets

1

Safeguards

Recommendations

Page 8 of 8

Party Responsible