This feature requires:

1. FieldLab Desktop App version 1.24.0 or later is installed on your PC. You can update from within the app if you already have it installed, or download the latest version for free.
   
2. FieldLab Firmware version 1.123 or later installed on a FieldLab Pressure Calibrator. Learn how to update firmware.
   

Instructions for FieldLab Desktop app versions 2.0 and later

You don't enter the valve's Set Pressure in FieldLab Desktop when you create this test. The Set Pressure is entered directly on the FieldLab Pressure Calibrator during the test. Everything you configure in this test mode is calculated relative to that Set Pressure once it's entered on the FieldLab at the time of the test.

1. In FieldLab Desktop, select "Test Library"

2. Select the "New Test" button, and then select "PSV/PRV" from the dropdown menu.

3. Name the test mode

Enter a name in the Test Mode Name field.

4. Choose the method for Crack and Reseat detection

      Auto Detection of Crack and Reseat
      The FieldLab automatically detects, displays, and saves the crack and reseat pressures. Use this where the crack and reseat happen so quickly that it's difficult for a person to determine the exact crack pressure.

      Manual Marking of Crack and Reseat
      The person performing the test watches the valve and manually marks the crack and reseat events by pressing a button on the FieldLab. Use when testing liquid Pressure Safety Valves (PSVs) or proportional relief valves, which open gradually rather than popping, so manual marking captures the crack point more reliably.

5. Set the number of cracks per test

Note that the number you enter and save in this test will be the required number of tests to perform on the FieldLab Pressure Calibrator every time you perform a test.

6. (Optional) Set the threshold for high-speed logging

Begin high speed test: X% of Set point

While the test is running, the FieldLab starts logging at 10 readings per second. When live pressure reaches the threshold (75% by default), the logging interval speeds up to 200 readings per second to capture the exact Crack and Reseat points. The FieldLab can sustain this high speed for 30 seconds before its high-speed data buffer fills.

Because of that limit, set the threshold as high as your test allows. If you need to hold pressure near the Set Pressure for an extended period before forcing a Crack, a higher threshold keeps you in sustainable 10-reading-per-second logging during that dwell period and reserves the high-speed window for the final approach to the crack.

7. Set the acceptable crack range

The Acceptable crack range setting defines the pass/fail limits. A crack pressure that falls within the limits passes; a crack above the over-limit or below the under-limit fails. You can set the limits yourself (Any Value or Conditional) or apply a published standard with Use Preset.

Any Value

Applies a single pair of pass/fail limits to every crack test, regardless of the Set Pressure entered on the FieldLab. You'll enter the limits in Step 9.

Conditional

Applies two different pairs of pass/fail limits, divided by a Set Pressure breakpoint you specify. Useful when your acceptance criteria change with pressure (a fixed tolerance at lower set pressures and a percentage at higher ones). You'll enter the breakpoint and both limit pairs in Step 9.

Or apply a standard with Use Preset

Select Use Preset to choose one of three published valve-testing standards:

1. ASME BPVC VIII.1 UG-134(d)(1)
2. ASME BPVC VIII.1 UG-125(c)(3)
3. ISO 4126-1

Selecting a preset automatically sets the acceptable crack range type and fills in the breakpoint and the over/under limits to match that standard. You can review the values entered in the threshold fields and the Summary panel before saving.

8. Set the default pressure unit

Use the Default Units dropdown to choose the pressure unit for the test. 

9. Set the pass/fail thresholds

How you enter the limits depends on the acceptable crack range type from Step 7. (If you applied a standard with Use Preset, these fields are already filled in for you. Review them and adjust if needed.)

If you selected "Any Value"

Enter the maximum by which the crack pressure may exceed the Set Pressure (the + field) and the maximum by which it may fall below the Set Pressure (the − field). Set each limit as either a fixed value in the default pressure unit or as a percentage of the Set Pressure, using the unit dropdown beside the + field. The same limits apply throughout the test, regardless of the Set Pressure.

If you selected "Conditional"

Define two pass/fail ranges separated by a Set Pressure breakpoint:

1. In the If set pressure row, choose the boundary operator (is less than or equal to or is less than) and enter the breakpoint pressure.
2. Under the first ...then the acceptable crack range is:, enter the + (over) and − (under) limits for set pressures on the lower side of the breakpoint.
3. The second If set pressure is greater than... row covers the upper side of the breakpoint. Enter the + and − limits that apply there.

FieldLab Desktop automatically sets the second range's condition to complement the first, so the two ranges always cover the full pressure span with no gap or overlap: if you choose is less than or equal to X, the second range applies to set pressures greater than X; if you choose is less than X, the second range applies to set pressures greater than or equal to X. Each limit can be entered in the default pressure unit or as a percentage of the Set Pressure.

10. (Optional) Include a Seat Tightness Test

When you include a Seat Tightness Test, the FieldLab Pressure Calibrator records:

1. That the test was performed
   
2. The amount of pressure applied to the seal
   
3. The duration of the pressure application
   
4. Whether it passed or failed
   

The FieldLab Pressure Calibrator interface prompts you to determine PASS/FAIL status at the time of the test.

Select Include Seat Tightness Test, then enter the Length of the test in minutes and seconds.

How you set the hold pressure depends on your FieldLab Desktop version.

---

Set the hold pressure in FieldLab Desktop 2.2.0 and later.

Requires FieldLab firmware 1.134 or later.

Use the Leak Test Pressure dropdown.

Within % of any Set Pressure

Enter the percentage of Set Pressure to hold. The same percentage applies to every test, regardless of the Set Pressure entered on the FieldLab.

Conditional on the Set Pressure

Applies two rules, divided by a Set Pressure breakpoint you specify.

      1. In the When Set Pressure over ___ psi row, enter the breakpoint pressure.

      2. Below it, enter the percentage of Set Pressure to hold above the breakpoint.

      3. The When Set Pressure at or under ___ psi, enter the number of psi under Set Pressure to hold for Set Pressures at or below the breakpoint.

Units are fixed for each rule: Percent above the breakpoint, psi at or below it. A Set Pressure equal to the breakpoint uses the at-or-under rule.

Note: This breakpoint is independent of the one used by a Conditional Acceptable crack range in Step 7. Changing one does not change the other.

Set the hold pressure in FieldLab Desktop 2.0 through 2.1.x

Enter the percentage of Set Pressure to hold. The same percentage applies to every test.

11. Save the new test mode

Select Save to save the test mode.

Next Steps

1. Add the test to your FieldLab
   See Add Test Modes to a FieldLab for instructions.
2. Use your FieldLab to perform a PSV/PRV test
3. Use a FieldLab to run a valve test with auto-detection of crack and reseat.
   
4. Use a FieldLab to run a valve test with manual marking of crack and reseat.
   

Instructions for FieldLab Desktop app versions 1.0 through 1.44.8

3. Name the test mode

4. Select Crack & Reseat Detection

Auto Detection of Crack and Reseat

When you select auto detection, the FieldLab will automatically detect, display, and save the crack & reseat pressures. Ideal for scenarios where the crack and reseat happen so quickly that it's difficult for a human to determine the exact crack pressure.

Manual Marking of Crack and Reseat

With this setting, the person performing the test watches the valve and manually marks the crack and reseat events with the press of a button on the FieldLab.

It is recommended that you select the manual setting when testing liquid Pressure Safety Valves (PSV) or proportional relief valves (PRV).

1. The high-speed threshold
   
2. acceptable crack range
   
3. seat tightness settings
   

Simple Crack Range

Simple Crack Range sets the pass/fail limits. Enter the maximum the crack pressure may go over the Set Point (or Set Pressure) and the maximum it may go under; set each as either a fixed value (psi) or a percentage of the Set Pressure. A crack that falls within both limits passes. A crack above the over limit or below the under limit fails. The same limits apply throughout the test, regardless of the Set Pressure entered on the FieldLab.

Conditional Crack Range

Similar to Simple Crack Range, Conditional Crack Range allows you define your own custom parameters, but with more options to handle if-then scenarios.

When you select any of the following for acceptable crack range:

1. ASME BPVC VIII.1 UG-134(d)(1)
   
2. ASME BPVC VIII.1 UG-125(c)(3)
   
3. ISO 4126-1

...specified standards will be applied to the test as defined by The American Society of Mechanical Engineers (ASME), or the International Organization for Standardization (ISO).

If you are including a Seat Tightness Test, enter your desired settings for Length of test and Static Pressure Setting. 

When you include a Seat Tightness Test, the FieldLab will enable you to record in your test data that the Seat Tightness Test was performed, the pressure that was applied to the seal, the length of time the pressure was applied, and whether it passed or failed. The FieldLab Gauge interface will prompt you for PASS/FAIL status at the time of the test.

In order to use the test you created on a FieldLab to test a valve, you must add it to a FieldLab. See Add Test Modes to a FieldLab for instructions.

Use a FieldLab to run a valve test with auto-detection of crack and reseat. 

Use a FieldLab to run a valve test with manual marking of crack and reseat.