The HAZOP Worksheet

So, with a little background about the HAZOP worksheet it is better to concentrate on how HAZOP reports are produced and presented. 

The following sections detail each of the headings of the HAZOP worksheet. 

The ffAZOP analysis technique is a detailed HA utilizing structure and rigor. It is typically performed using a specialized worksheet. Although the format of the analysis worksheet is not critical, generally, matrix or columnar-type worksheets are used to help maintain focus and structure in the analysis. The HAZOP analysis sessions are primarily reported in the HAZOP worksheets, in which the different items and proceedings are recorded. As a minimum, the following basic information is required from the HAZOP analysis worksheet ... 

In addition, it provides a list of potential actions that should be evaluated. Table 4.16 is an example of a HAZOP study worksheet. A typical HAZOP study report should include a brief system description, a list of drawings or equipment analyzed, the design intents, the HAZOP study tables, and a list of actions items. 

Prepare the HAZOP or What-If review meeting node listings and worksheets before each review session. 

Access to a compatible computer printer is needed to generate hard copies of the HAZOP or What-If software worksheets and word processor reports. 

For a typical HAZOP worksheet the columns are identified by the following titles and a description of the contents is given ... 

A sample HAZOP worksheet for the feed preheater process (Figure 3.7) is presented in Table 3.6 this is for a specific deviation in node 3 of Figure 3.7. The hazard review leader should ensure that basic information such as session date, skid name, node number. 

Table 3.6 Sample HAZOP worksheet for the feed preheater. 

Figure 14.4 Partially complete HAZOP worksheet for the vapor degreaser system.

Taking the above stated differences between the What-If Analysis Worksheet and the HAZOP process. Figure 14.3 provides an example of a typical HAZOP Worksheet. Note the headings over each column. Some are identical to those found on the What-If worksheet and, therefore, transfer of the information from any previous What-If... 

Table 6.2 is an example of a typical HAZOP worksheet for a caustic regeneration process. As can be seen in the worksheet, the node is described (along with its components), and then the team walks throngh the node applying each guide word. 

AHAZOP is a structured brainstorming meeting, set up to identify potential undesirable events that may create hazards or operability problems, i.e. risks to personal safety and potential damage to assets, the environment and the reputation. The identified hazards, along with any actions for further investigation, and other relevant supporting information are recorded on HAZOP worksheets. 

ESC s SILComp(R) software provides a step-by-step interactive guide through the LOPA process and allows importing from HAZOP worksheets. The use of software packages such as SILComp can help reduce project man-hours, ensure consistency in approach and methodology, and give confidence that the workshop is performed in accordance with lEC 61508/61511. 

It may be desirable to discuss facility siting issues at the beginning of the PrHA sessions. As a minimum, comments and assumptions about siting and plant layout can be included in the PrHA analysis documentation, such as on HAZOP study worksheets. Table 3.2 provides a sample checklist for worker/co-located worker exposures. A sample checklist for facility siting issues is presented in Table 3.3. 

A worksheet (data base spreadsheet) form is used to collect and collate the process hazard analysis review data. A computer software generated spreadsheet is typically used. For a complete description of commercially available HAZOP or What-If software, the user should refer to the manufacturer s HAZOP or What- If software User Instructions. Although pre-printed forms may be used, they are highly inefficient and should be maintained only as a backup in case of computer hardware or software failures. 

The questions should continue until all elements are addressed. If a more detailed and complete HAZOP study should be required, the information contained on the what-if analysis worksheets will help facilitate and streamline the pending HAZOP study. 

Do not go overboard with this. As you can see, the worksheet is very detailed be judicious about the level of detail that you need. You certainly will not want to HAZOP in detail an entire plant. However, the most hazardous operations must be studied in detail. 

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