Configuring a HEXTUBE Component

Used in heat exchangers, HEXTUBEs are used to carry gas and/or liquids from one side of the heat exchanger to the other. They only require that you define the general properties and then review the calculated results.

General Properties

The General Properties tab contains information about the HEXTUBE and is divided into two nodes: General and Financial.

IMPORTANT: If you change a measurement unit, you must also manually change the specified value, as the RBI software will not change the values.

General

The properties in this node determine the basic properties of the HEXTUBE. Note the following:

The model can be generated from previous inspection data of HEXTUBEs in identical or similar process environments. If no previous data is available, you can create a model from whatever information is available, such as estimated corrosion rates and corrosion allowance information.

Financial

The Financial properties are used to determine the monetary cost of the HEXTUBE failing. These calculations take into consideration or calculate the hole costs, material costs, plant downtime, cost of the equipment, the cost on the surrounding area and the personal injury costs. Note the following:

If desired, you can use the Notes column, , to record any notes about the information supplied. These notes appear only in the RBI Properties tab and are not displayed in any reports. Double-click inside the cell to open the Notes window. An icon in the cell indicates that notes have been saved for that field.

Results Properties

The results are displayed in the following nodes:

If the risk on the plan date is less than the maximum acceptable risk, then no target date is given as no inspections are needed until the plan date.

RBI Plot

The RBI Plot tab shows the risks associated with the HEXTUBE versus the various critical dates during the analysis in a financial risk plot. (Note that the Area Risk plot does not show any data as HEXTUBES are not concerned with the risk to the surrounding area.)

The risk values that always appear for a component are those associated with the RBI date and the plan date without any recommended inspections. If calculated results indicate that the component require inspections prior to the plan date, then the risks at the target date (for inspections) and the plan date (with inspections performed) are also shown. In addition, if by estimation the component reaches minimum wall thickness, a red line will be shown to signify the date associated with reaching minimum wall thickness.

 

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