This article presents a quick introduction and overview to the Kenexis Vertigo™ software for SIS Design Basis Development. Vertigo™ is a module in the Kenexis Instrumented Safeguard Suite (KISS) of Application. KISS is a multi-user multi-site internet enabled enterprise software application, provided in the Software-as-a-Service (SaaS) format.
During this getting started tutorial, Ed Marszal, the President of Kenexis will lead you through a SIL verification calculation for a safety instrumented function of the General Oil and Gas Operating Company Chemical City Gas Production Facility. For those of you that are familiar with Kenexis Training, you will recognize this fictitious company and plant from a range of our training offerings. The facility description, including P&IDs, PFDs, plot plans, risk tolerance criteria, and a process description. You can download the training course packet with the plant description by clicking on the hyper-link below.
The getting started tutorial is presented in the video below. In addition, there is a written overview of the contents of the video in the text below the video.
After logging in to the Kenexis Instrumented Safeguard Suite, you will be directed to the Project Manager application where you will be presented with a list of facilities for which you have access. By clicking on a facility in the facility list, you will be presented with a list of studies associated with that facility in the workspace area of the application. When you first start, you will need to create a facility to perform your work, which is done by clicking the Facility Manager icon in the Project Manager action ribbon. This will take you to the Facility Manager page where you will be presented with a list of the facilities that you are the owner of, or to which you have been granted access. In the Facility Manager, click on the Add New Facility button. You will be presented with a facility data entry form. Simply enter the facility name “GOGO Chemical City” and click insert (you can ignore the balance of the data input fields at this point). You can then click on “Back to Study List” in the action ribbon to return to the Project Manager. Now, GOGO Chemical City will show up on your facility list and you can select it.
You create the new study (inside the selected facility) by clicking on the Add New Study button in the action ribbon and selecting “SIS Design Basis” as the study type. Upon taking this action you will be presented with a dialog that requests the Study Name and Project Number. Enter the data and click insert. This will create the study’s database entry and bring you to the Overview page inside Vertigo™.
You will want to begin by adding Study Data. Click on the Study Data icon in the action ribbon. Begin by adding the P&ID information for the drawing that contains the high pressure safety function that protects vessel V-101 of the example facility. Do this by selecting Drawings in the tab strip and the click on “Add New Record”. You will be presented with an insert screen that allows you to enter the drawing’s data, including a hyper-link to access external data that is web enabled. Next, click on “IPF Groups” in the tab strip and add a new record with a tag of “UZC-101” and a description of “High Pressure Separator (V-101)”.
Next, create the safety instrumented function. Click on “IPF List” in the action ribbon and add a new record. In the insert line, define the function, giving it a description, item number, and tag number. Also, set the input and output group voting to 1oo1, as only a single measurement and single output action are used in this function.
After inserting the IPF, you will need to create the instruments that are used in the function. Select Study Data from the action ribbon and selection Instrument Types in the tab strip. For Process Connections, select “Add From Library”, select Impulse Line – Generic, and then click the Insert button. This brings the data from the Library into the Study database. Do the same for “Intrinsic Safety Barrier” in Sensor Interfaces, “Pressure Transmitter – Generic” in Sensor Type, “Generic SIL 3 PLC” in Logic Solver Type, “Generic DTT 3Way Solenoid” in Final Element Interface, and “Air Actuated Ball Valve” in Final Element Type.
Next, add the instruments. Select Instruments from the tab strip. In Sensors, click “Add New Record”. In the dialog for calculation information, enter the tag name and service description for the pressure transmitter (PT-101D). Set the test interval for the device to 36 months. Select 1oo1 voting for this single device, and then select the impulse tube for the process connection and the instrinsic safety barrier for the first sensor interface. In the PFD calculation component section you can deselect “include common cause” if you like (since the device is 1oo1 your selection will be ignored), but leave “Trip on Detected Failure”. Leave the rest of the component flags in their default state (i.e., assume perfect testing and that testing does not occur while the plant is on line). If you like, you can enter the safety requirements specification information for this device on the Details tab. Clicking Insert will run the PFD and STR calculations and insert the device into the database. Next, do similar input of data for the Logic Solver and the shutoff valve SDV-101.
Now that the devices are defined you can be associated with the IPF. Click on IPF List in the action ribbon and view the detailed data for the IPF by clicking on the Expand button (i.e., the triangle at the left of the row). Click on Sensor in the tab strip of the detailed view. Click on the “Add New Record” button and select and insert PT-101D. Do similarly for the Logic Solver and Final Element. Subsequently, go to the Summary Tab to review the overall calculation data for the function (note: depending on browser, this may require clicking on the Expand button to refresh the data). Now, the SIL verification calculation has been completed. You will probably see that the SIL 1 target has not been achieved at the desired test interval. At this point you can perform a series of what-if calculations to determine what design changes will allow the SIL target to be achieved.
As always, if you run into any problems utilizing Vertigo™, please feel free to contact Kenexis technical support at [email protected].