TM V4 006 TML Trending

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Version 4.0.1.28 TM-V4-006 Revision #: 0 Date: 7/18/2007 Page 1 of 34

Thickness Monitoring Location (TML) Trending (TM-V4-006) 1.0 Purpose TMLs allow the user to gain a better understanding of where corrosion is occurring and at what rates, and in turn develop strategies to allow the equipment to be operated in a safe and reliable manner while prolonging its useful life. Where a TML is placed can be decided by:

• Corrosion/Inspection Personnel • Corrosion Engineers • Inspection Engineers • Experienced operations personnel

At the end of this training manual, the user should be capable of:

• Locating TML Information • Creating TMLs (Stand-alone and Multiple TMLs) • Inputting Thickness Data (Stand-alone and Multiple TML entries) • Analyzing TML / Corrosion Detail • Interpreting your TML Trending Graphs • TML Scheduling • Successfully completing the TML Exercise

2.0 Description

2.1 TML Trending Module

2.1.1 Locating TML Information To locate a TML, the user must first select the equipment from the Equipment Index. To access a piece of equipment, the user can:

• Right click on the piece of equipment and select “Open Detail” from the context-sensitive menu • Double click on the piece of equipment

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If TMLs have already been created for the piece of equipment, the user will notice that ‘TML Trending’ appears in bold font, with a ‘+’ to the left of it. Clicking on the ‘+’ will provide a list of existing TMLs. Double clicking on TML Trending will open a new screen summarizing the TMLs and their respective thickness information.

2.2 TML Log – Commands

Command Function

New TML Create a new TML Add Readings Add TML thickness readings to all currently existing TMLs within the TML Log. Re-Calculate Equipment Re-calculate the corrosion rates, inspection schedule and expiration dates for all

TMLs. Re-Calculate Selected TMLs Re-calculate the corrosion rates, inspection schedule and expiration dates for

selected TMLs. Delete TML Delete the selected TML

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Activate / Deactivate TML Add / Remove TML from scheduling calculations

2.3 Creating New TMLs

2.3.1 Creating a Single TML Point

Select “New TML”. A new screen will appear with the necessary fields to create a TML with the required TML information. The mandatory fields (colored background) are to be completed before the user will be allowed to click on “Ok”.

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When creating a new TML, there are four (4) sections that will contain its properties:

• TML • Readings • TML Details • Thicknesses & Risk Codes

2.3.1.1 TML – Definitions

Field Function

Number of TMLs to Create Identifies the number of TML points to be created (for this section, it will be one; the manual will cover multiple TML point creation in Section 2.3.2).

TML ID Unique number for the TML related to the piece of equipment. For example, for a vessel with a tag number of V-100, TML IDs could be V-100-005 and V-100-010. It is suggested that the first batch of TML entries be staggered with intervals of fives (5) as this allows for any future TMLs that may be located in between. This field can have a maximum of fifteen characters – a limitation imposed for compatability with DataLoggers.

Equipment Identifies what piece of equipment the TML is being assigned to.

2.3.1.2 Readings – Definitions

Field Function

Grid Becomes visible with a check mark when the row count is greater than 1 Column Count For any TML that you wish to store a horizontal or vertical band of readings, this number can

range from 1 through 100. Row Count If your intention is to have a TML be a grid of readings (i.e., a corrosion map), then this number

can be anything up to 100. Preview Provides a preview of the TMLs to be created with the number of rows and columns for the

purpose of determining their validity. Sample Number Becomes active when the user wishes to create multiple TMLs and provides a preview of the TML

numbering scheme (See Section 2.3.2).

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2.3.1.3 TML Details – Definitions

Field Function

TML Description Provides a physical description of where the TML is located on the piece on equipment. Year Installed Identifies the year when the TML was first put into service Activity Code Identifies the suggested or most common form of inspection carried out at this TML. TML Classification Limited list of areas with which the TML can be located on. Drawing No. Identifies the drawing of the piece of the equipment and the location of the TML on the piece of

equipment. ISO Number Identifies the drawing of the piece of the equipment and the location of the TML on the piece of

equipment. Circuit ID Defaulted from Static Data Information

2.3.1.4 Thicknesses & Risk Codes – Definitions

Field Function

Section ID Defaulted from the Section IDs in the equipment’s Static Data information and chosen by the user to select the appropriate equipment area to base the Nominal, Corrosion, Minimum and Material information on.

Nominal Derived from Section ID or, if unavailable, can be manually entered by the user. Insp Risk Code Derived from the RBI Assessment or RAID. Restricted Interval Derived from the selected IRC. Critical Thick The thickness identifier used to drive the expiry date calculation and scheduling. RAID Identifies the Risk Configuration used on this TML. Active If the TML is active the calculations are performed. Inactive TMLs will not influence equipment

scheduling. Stream External (On); External (Off); Internal.

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C.A. Corrosion Allowance of the material. Min Thick Calculated according to the Minimum Type formula. Arbitrary Minimum Can either be the same or greater than the Minimum Thickness. This is the indicator used to

decide when equipment should be replaced. Default Corr Rate Calculates the Expiration Date when only the baseline thickness is known. Minimum Type Three (3) forms of Minimum Type calculations that identifies how the Minimum Thickness is

derived:

NCA: Minimum Type calculated by subtracting the given corrosion allowance from the given nominal thickness. ENGS: Minimum Type calculated by using an engineering standard as the minimum thickness. Commonly used in low pressure piping systems Code: Minimum Type calculated using the formula from the applicable Code of construction (ASME VIII, ASME I, ASME B31.3, etc.).

Critical Buffer A percentage value added to Minimum Thickness for Critical Thickness calculations RL Factor Used to calculate Next Inspections when Corrosion Rates indicate a failure within the Restricted

Interval (See Section 2.3.4.1).

2.3.2 Creating Multiple TML Points

Select “New TML”. Increasing the “Number of TMLs to Create” field from 1 will cause the “Configure TML ID” options to appear on screen.

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Note: The definitions listed under Section 2.3.1 are still applicable when creating Multiple TMLs, however, a new section appears when the user wishes to create Multiple TMLs – Configure TML ID.

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2.3.2.1 Configure TML ID – Definitions

This panel allows the user to define an automated numbering scheme for creating multiple TMLs at the same time, and is divided into the following three (3) sections: Configure TML ID - Prefix

The Prefix identifies what number, letter or text the user wishes to have appear at the start of the name of the TMLs being created. Numbers start at: Identifies what number will be at the start of the first TML and the increment that the TMLs follow. For example, creating 3 TMLs, starting with the number 5 and the increment being 10, the TMLs would begin with numbers, 5, 15 and 25 respectively. Letters start at: Identifies what letters the user wishes to appear in front of all the TMLs to be created. For example, creating 3 TMLs with a prefix of A, then the three TMLs would have A, B and C for the Prefix. Use this text: Identifies what text the user wants to appear in front of TMLs the user wants to create. For example, creating 3 TMLs for a vessel, V-100, then V-100 could be inputted and resulting in all TMLs beginning with V-100. Configure TML ID - Base

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The Base represents the text located between the Prefix and Suffix. Numbers start at: Identifies what number will be at the start of the first TML and the increment that will follow the TMLs following it. For example, if you wanted to create 3 TMLs, starting with the number 5 and the increment being 10, the TMLs would have 5, 15 and 25 as the base respectively. Letters start at: Identifies what letters the user wishes to appear in middle of all the TMLs to be created. For example, creating 3 TMLs with a prefix of A, then the three TMLs would have A, B and C for the Base. Use this text Identifies what text the user wants to appear in front of TMLs the user wants to create. For example, if the user was creating 3 TMLs for a vessel, V-100, then V-100 could be inputted and resulting in all TMLs having V-100 as the Base. Configure TML ID – Suffix

Numbers start at: Identifies what number will be at the end of the first TML and the increment that will follow the TMLs following it. For example, if you wanted to create 3 TMLs, ending with the number 5 and the increment being 10, the TMLs would end with 5, 15 and 25 respectively. Letters start at: Identifies what letters the user wishes to appear at the end of all the TMLs to be created. For example, creating 3 TMLs with a prefix of A, then the three TMLs would have A, B and C for the Suffix. Use this text

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Identifies what text the user wants to appear in front of TMLs the user wants to create. For example, if the user was creating 3 TMLs for a vessel, V-100, then V-001 could be inputted and resulting in all TMLs having V-001 appearing at the end.

2.3.3 Copying TML Points In some cases, it will be more effective to copy existing TMLs and apply them to the same piece of equipment or apply them to another piece of equipment. The Copy and Paste commands are located on the Navigation Toolbar of the TML Log screen.

First, the user must select which TMLs are to be copied. The user has the option to clone one or more TMLs. To clone multiple TMLs, the user must hold the CTRL key and then select the desired TMLs. If the user has accidentally selected the wrong TML, while still holding CTRL, click on that TML again to have it removed from the selection. This process is shown here:

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With the TMLs now selected, the user should click on the “Copy” Button

A pop-up window will appear informing the user that the copying was successfully completed:

When the user is ready to paste the recently copied TMLs, the user must click on the “Paste Saved Rows” button located on the TML Log navigation toolbar:

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This will result in a pop-up window appearing showing the recently copied TMLs:

It is important that the copied TML ID number is unique relative to the receiving equipment. The user must edit the TML ID prior to pasting. If ignored, the following error message is displayed,

When the TMLs are to be applied to a different piece of equipment, the user must first access the TML log of the second piece of equipment. For example, if the user was to copy TMLs from 4”-FL-56012 and paste them into 8”-FL-56012, it would be necessary to access the TML Trending Log of the 8” Pipe. Once there, the user would click on “Paste Saved Rows” and would see a screen resembling the following:

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This would cause a pop-up screen to appear, listing the copied TMLs available for pasting.

Note: Importing TMLs from one piece of equipment to another is only useful for carrying over the information. It will be necessary to still go into the newly formed TMLs and apply the appropriate Section ID so that the Nominal, Corrosion Allowance, Minimum Thickness and Material Type is correct. In most cases, it will be necessary to change the TML Description before pasting in copied TMLs. Once the preliminary changes have been made, the user can click on “Ok” to have the pasted TMLs added to the TML Log. For example, changing the copied TMLs’ names and TML Descriptions to the following:

TML Name TML Description A1 Pasted TML A1 B1 Pasted TML B1 C1 Pasted TML C1 D1 Pasted TML D1

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And clicking on “Ok” would result in the following:

2.3 TML Applications Now that the TMLs have been created, the user has the ability to:

• Access TML Detail Information • Input TML Thickness Readings • Analyze TML Corrosion Rates • Document TML inspection history • Graphically analyze the TML integrity • Schedule future TML Inspections

2.3.1 Accessing TML Information To access information regarding TMLs, the user should double-click on the desired TML in the TML Log:

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2.3.2 TML File Screen The TML File summarizes the information input when the TML was first created (See Section 2.3.1 / 2.3.2) in addition to summarizing the Access Requirements and TML scheduling based on the TML corrosion rates found under the Reading Detail tab (See Section 2.3.3).

If the user wishes to scroll between TMLs of interest to compare inspection dates or corrosion rates, the user can click on the tool bar located at the top of the screen,

Scrolls back to the First TML

Scrolls back to the Previous TML

Scrolls ahead to the Next TML

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Scrolls ahead to the Last TML

In addition to the information that was previously entered in by the user in Sections 2.3.1 and 2.3.2, the user can now define the Access Requirements. The Scheduling information for this TML is also displayed.

Access Requirements are used to define what resources and actions are necessary in order to carry out an inspection at this specific TML.

Scheduling Field Function

Next Insp. Date Due Defaults to the Next Insp. Calculated; however, it can be edited by the user to coincide with another desired date (e.g. during turnaround or to coincide with the earliest calculated date within the piece of equipment or circuit.)

Based On Based on the Restricted Interval (RI) or Equipment Degradation (DEG). If based on Degradation, the corrosion rate predicts when the critical thickness will be reached within the time frame of the Restricted Interval.

Next Insp Date Calculated Next Inspection Date calculated based on Restricted Interval or Degradation Mechanism corrosion rate -- See Section 2.3.4.1.

Expiration Date Date the TML will reach Critical Thickness based on worst case scenario of the 4 available corrosion rates (See Section 2.3.4). Otherwise, based on default Corrosion Rate (if available).

2.3.3 All Readings Tab The second tab to appear when working on one (1) specific TML is All Readings. In this section the user is able to input, edit and delete thickness readings.

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Under All Readings, the user has access to the following commands:

Command Function

Add Readings Add a new Thickness Reading to the TML under observation. Delete Test Date Deletes the highlighted test date. The TML would need to be recalculated to update TML

Scheduling and Corrosion Rates. Edit Selected Readings Edits previously entered TML thickness readings. Since Last Baseline Removes the Baseline TML entry from view. Recalculate TML Recalculates Corrosion Rates and schedules and recently made additions, deletions or edits. Clicking on “Add Readings” will bring the following screen up:

Add Readings Command Function

Test Date Identifies the date the TML was inspected, as opposed to the date the thickness readings were entered.

Baseline Check if the selected reading is a baseline reading. Current Temp Identifies the temperature of the equipment at the time the TML readings were taken. Activity Cody Identifies the activity code that was used to obtain the thickness readings. Stream External (On); External (Off); Internal. Once all thickness data has been entered, click on “Ok” located at the bottom of the window. The user will be asked to recalculate the Corrosion Rates and Scheduling information:

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Clicking on “Yes” will notify of the Corrosion Rate and Scheduling update,

2.3.3.1 Inputting Thickness Information – Multiple Points If the user wishes to input thickness readings for multiple TML points belonging to a piece of equipment, he can click on the “Add Readings” button located on at the bottom of the TML Log screen:

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Once clicked, a new screen will appear displaying all the TMLs created with their respective TML points ready to be populated with thickness data:

The fields displayed and procedure match those described in Section 2.3.3.

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2.3.3.2 Inputting Thickness Information – Data Logger If the uses wishes to upload multiple thickness readings for multiple TMLs belonging to multiple pieces of equipment, then using the Datalogger allow for a quick and easy data upload. The datalogger interface under the Tools menu and labeled, Datalogger.

For further information the Datalogger interface, see Training Manual Report, TM-V4-TBA.

2.3.4 Analyzing TML Thickness Data (Reading Detail Tab) If the user wishes to gain an understanding into the corrosion rate for a specific TML the Reading Detail tab allows the user to obtain:

• Average Reading obtained on a TML test date. • Minimum Reading obtained on a TML test date. • Minimum Short-Term Corrosion Rate. • Minimum Long-Term Corrosion Rate. • Average Short-Term Corrosion Rate. • Average Long-Term Corrosion Rate.

2.3.4.1 Definitions – Reading Detail of TML Grid

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Minimum Short-Term CR

Takes the minimum of all thickness readings from the most recent test date and compares it to the minimum readings obtained from the previous TML inspection date and is divided by the time difference (in years) between the two. Minimum Short-Term CR = TML-Min i-1 - TML-Mini t i-1 - t i Minimum Long-Term CR Takes the minimum reading from the most recent test and compares that to the minimum reading obtained during the baseline TML inspection; the result is then divided by the time difference (in years) between the two.

Minimum Long-Term CR = TML-Min Baseline - TML-Min i t Baseline - t i

Average Short-Term CR Takes the average of all thickness readings from the most recent test date and compares it to the average readings obtained from the previous TML inspection; the result is then divided by the time difference (in years) between the two.. Average Short-Term CR = TML-Ave i-1 - TML-Ave i t i-1 - t i

Average Long-Term CR Takes the average reading from the most recent test and compares that to the average reading obtained during the baseline TML inspection; the result is then divided by the time difference (in years) between the two. Average Long-Term CR = TML-Ave Baseline - TML-Ave i t i-1 - t i

The above calculated rates will calculate the Expiration Date of the piece of equipment at this particular location and in turn will determine when your next TML inspection should take place. For example, based on the following Min and Avg Readings the Corrosion Rates would be as follows, Date Min

Reading Avg

Reading Min Short-Term CR

Min Long-Term CR

Ave Short-Term CR

Ave Long Term CR

Baseline (Aug 5, 2005)

.337 .337

Aug 16, 2006 .324 .3283 .0126 .0126 .0084 .0084 June, 25, 2007 .205 .2898 .1388 .0699 .0449 .025 Note: Corrosion Rates within Visions are based over years so the time between Aug 5 2007 and Aug 16, 2006 is 1.027 while the time between Aug 16 2006 and June 25, 2007 is 0.8575 years. Furthermore, of the 4 Corrosion Rates available for analysis, the greatest value is used to calculate the Expiration Date (See Section 2.3.4.1).

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2.3.4.2 Definitions – Reading Detail of TML Grid

Short and Long Corrosion Rates are calculated for each Grid of a TML Grid in Long and Short Loss. Long Loss = Baseline Reading (Row x; Column y) – Last TML Reading (Row x ; Column y) Time (years) Short Loss = TML Reading, i (Row x; Column y) – TML Reading, i-1 (Row x; Column y) Time (years) For Example, if the following Thicknesses existed for a section of a TML Grid: Date: June 25, 2007 Column Row

1 2 3

1 .500 .500 .500 2 .500 .500 .500 3 .500 .500 .500

Date: June 25, 2008 Column Row

1 2 3

1 .325 .318 .426 2 .415 .305 .437

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3 .425 .330 .441 Date: June 25, 2009 Column Row

1 2 3

1 .150 .165 .147 2 .255 .157 .125 3 .345 .235 .148

The user would in turn get this:

Location Long Loss Short Loss Column 1, Row 1 0.175 0.175 Column 1, Row 2 0.1225 0.16 Column 1, Row 3 0.0775 0.08 Column 2, Row 1 0.1675 0.153 Column 2, Row 2 0.1715 0.148 Column 3, Row 1 0.1765 0.279 Column 3, Row 2 0.1875 0.312 Column 3, Row 3 0.176 0.293

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2.3.4.3 TML Scheduling As mentioned in Section 2.3.2.1, the TML scheduling is summarized under the TML Details tab and consists of the following four (4) components:

Next Insp Date Due Initially defaulted to the Next Insp. Date Calculated field, this date can be edited by the user to coincide with a specific date (e.g. Turnaround Inspection Date, Earliest Next Insp. Date Calculated that was within that piece of equipment or circuit). However, this is not recommended best practices. Based On TML Scheduling is based on the Restricted Interval or the Degradation Mechanism / Remaining Life Factor. The Restricted Interval is derived from the assigned Inspection Risk Code (IRC) assigned to the TML and it identifies the maximum number of months that can exist between two (2) TML inspection dates. In cases where the corrosion rate is predicting an Expiration Date (see definition below) outside the RI range, then the next inspection will be based on the RI.

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Next Insp Due dates based on the Degradation Mechanism are the result when the corrosion rate (the shortest of the Minimum Short Term; Minimum Long Term; Avg Short-Term; Avg-Long Term) indicates that the critical thickness will be reached within the Restricted Interval time frame. Under this scenario, the TML scheduling will use the Remaining Life Factor (a percentage value below 100%) that will accurately predict when the next TML Inspection will occur. Next Insp Date Calculated Under normal circumstances, this date is related to the Inspection Risk Code and its corresponding Inspection Frequency. For example, if an IRC of 3 requires an inspection every 36 months, then an inspection carried out on June 25, 2007 would be inspected again on June, 25, 2010. However, when the corrosion rate predicts an Expiration Date to occur within this Inspection Frequency, the Next Insp Date Calculated is determined using this equation: Next Insp Date Calculated = [(Expiration Date – Last Date of Inspection) * RL Factor] + Last Date of Inspection The Remaining Life (RL) Factor is a percentage value, less than 100% used to determine the Next Inspection when it is known a piece of equipment is nearing the end of its useful life. This allows inspectors to increase the number of inspections performed so as to avoid a potentially dangerous failure event. Using the thickness values and corresponding Inspection Risk Codes, Next Inspection Date Calculated is determined as follows:

Expiration Date Last Inspection Date IRC Code RL Factor March 28, 2008 June 25, 2007 3 .5

Next Insp Calculated = [(March, 28, 2008 – June, 25, 2007) * 0.5] + June, 25, 2007 = November, 11, 2007 Expiration Date Identifies the date when the TML will reach the Critical Thickness Value. The Expiration Date uses the highest Corrosion Rate obtained from the last TML inspection and will use the following formula: Expiration Date = (Min or Avg) Reading of Last Inspection Date - Critical Thickness + Last Inspection Date (Min or Avg) Corrosion Rate Using the TML Thicknesses from Section 2.3.4, the Expiration Date is calculated as follows,

Last Inspection

Critical Thickness

Min Short Term CR

Min Long Term CR

Avg Short Term CR

Avg Long Term CR

Min Reading Avg Reading

June 25, 2007 0.100” 0.1388* 0.0699 0.0449 0.025 .324* .328 * - Expiration Date uses the highest Corrosion Rate and the corresponding thickness value. Expiration Date = 0.324” - .100” + June 25, 2007 (0.1388” / year) = .6196 years + June 25, 2007 = March 28, 2008

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2.3.5 TML Notes The Notes section can be used to input text information regarding the TML to provide insight on the current state of the TML integrity. For example, the user might want to provide input on the condition of the equipment at the TML site or comment on the type of degradation mechanism(s) present at the TML. In addition, it can used to comment why the TML has been deactivated, has had its RI overwritten or its Next Insp. Due Date changed.

To add a new note, the user must click on the button to input a new note. The user will, then be required to choose the date of the note; it is suggested that it coincide with the date of a thickness reading. The user is then allowed to enter in whatever text he wants in the field provided. Once completed, the user can click on

the button to save the newly entered text.

2.3.6 Corrosion Graphing As previously stated in Section 2.3, a TML can either be a TML point consisting of 1-12 points or a TML grid consisting of a series of points. Depending on the type of TML (point or grid) the Trending Graph will also be different.

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2.3.6.1 TML Trending Graph Under Trending Graph the user can visually analyze the rate of corrosion being experienced at the TML of interest. With TML points, with a history of TML inspections, a corrosion graph would resemble the following,

The X-Axis displays the TML test dates and scales them appropriately to show the time difference between dates.

The Graphing Key below the graph can be configured to show specific information that the user wishes to analyze,

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The y-axis on the left represents the wall thickness of the TML. This axis is configured automatically and will increase / decrease as more readings are entered so as to properly display the current state of the TML

The right hand y-axis represents the Temperature of the TML when it was inspected. This axis is also automatically configured and will scale itself so as to properly represent all values. If the Temperature Check Box is deactivated at the Graphing Key, the Y-Axis values will disappear from view.

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2.3.6.2 TML Trending Grid If the user is working on a TML Grid and wishes to analyze the TML Colorized Grid, the user will see a screen resembling the following,

Areas in black represent the areas of greater thickness while areas in red represent areas of reduced thickness values.

The X-Axis of the Colorized Grid represents the Columns created, as mentioned in Section 2.3 while the Y-Axis represents the number of rows created, as mentioned in Section 2.3.

Above the Colorized Grid, the user can customize how the grid is to be presented.

If Smooth Grid is clicked to have a check mark appear, it will create a colorized grid show smooth transition from low to high thickness. However, if this option is turned off, it will create a grid showing a more distorted view with each block having a fixed value. For instance, if the above graphic was to chosen to not be a Smooth Grid it would appear like this,

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Clicking on Hide Readings will remove the thickness values from the colorized grid and will leave the user with a visual representation of the colorized grid,

The user will also have the option to zoom in on the colorized grid. This would be useful in examining the thickness behavior of a particular region of the grid. To zoom in, the user must click and drag the mouse over the area of interest.

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For example, if the white box in the below example represented the area of interest, the user would would see the following two screens:

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Clicking on “Show Full Grid” will return the user to the original colorized grid. The TML Scheduling is the same as outlined in Section 2.3.4.1.

3.0 TML Exercises

3.1 TML Quiz

1. How do you locate TML Trending information for a specific piece of equipment? 2. How do you locate the TML Trending Scheduling information for all equipment? 3. What are the three methods available for calculating the Critical Thickness? 4. What would be the Next Inspection Calculated Date be for the following TML information, IRC, 3 Restricted Interval, 36 Months Last Inspection Date, June 1, 2008 Expiration Date, February 15, 2009 Remaining Life, 0.45 2. If you wanted to create 5 TMLs for a vessel tagged V-1050 and you wanted the following naming characteristics,

Prefix: TML- Base: V-1050- Suffix: 005 Suffix Increment: 5 Name the 5 TMLs that would be produced (Section 2.3.2). 1 2 3 4 5 2.

2.4.2 – TML Exercise

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Input the following TML Information. Under a piece of equipment, perform the following tasks: 1. Create 3 TMLs for a piece of equipment with the following naming characteristics: Base: EG- Suffix 100 Suffix Increment 5 Number of Columns = 6 Number of Rows = 1 IRC = 3 RI = .5 Nominal Thickness = .475 C.A. = .265 Use the NCA Method to calculate the Critical Thickness. 2. Create a TML Grid with the following naming characteristics: Base: EG- Suffix: 130 Number of Columns: 6 Number of Rows: 6 IRC = 3 RI = .5 Nominal Thickness = .475 C.A. = .265 Use the NCA Method to calculate the Critical Thickness. 3. Input the following baseline thickness measurements using the thickness input method that allows you input readings for multiple TMLs at one time with the following inspection criteria: Inspection Date, July 13, 2008 Inspector Name: John Manning Temperature: 98 With the following Thickness Results

TML ID 1 2 3 4 5 6 1 .475 .475 .475 .475 .475 .475 2 .475 .475 .475 .475 .475 .475 3 .475 .475 .475 .475 .475 .475

Grid .475 .475 .475 .475 .475 .475

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.475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475 .475

What is the Next Calculated Inspection Date? 4. Input the following inspection measurements and criteria: Inspection Date: June 25, 2011 Inspector Name: John Manning Temperature: 105 With the following Thickness Results:

TML ID 1 2 3 4 5 6 1 .402 .407 .224 .309 .305 .317 2 .457 .423 .424 .435 .447 .446 3 .451 .448 .432 .458 .415 .401

Grid .398 .375 .405 .404 .405 .403 .458 .465 .414 .411 .402 .405 ..433 .305 .313 .325 .337 .348 .447 .428 .457 .446 .443 .424 .410 .409 .425 .424 .423 .420 .398 .357 .348 .343 .330 .320

What are the: 1 – Earliest Expiration Date for all 4 TMLs? 2 – Earliest Next Insp. Calculated date?

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