Create a custom Pressure Safety Valve / Pressure Relief Valve Test to run on a FieldLab

Create a custom Pressure Safety Valve / Pressure Relief Valve Test to run on a FieldLab

Create a new valve test and add it to a FieldLab Pressure Calibrator to perform tests on pressure safety and pressure relief valves.
InfoThis feature requires:
  1. FieldLab Desktop App version 1.24.0 or later 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.

1. In FieldLab Desktop, select "Test Modes"




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


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).

5. Select the number of crack tests you want to perform on the PSV/PRV. 


6. (Optional) Adjust high speed test threshold to avoid high speed data buffer overrun.


The PSV Test will log pressure at 10 readings per second until the live pressure reaches 75% of the Set Pressure while test is in progress. Once the live pressure reaches this 75% threshold, data logging will speed up to 200 times per second to detect the exact Crack and Reseat readings. Logging at this speed can be maintained for about 30 seconds or until the high speed data buffer is full on the FieldLab. 
If your test requires you to maintain a 80%-95% of the Set Pressure for an extended time prior to forcing a Crack, set this threshold high enough so data can be logged for as long as necessary at the lower soeed (10 readings per second) prior to ramping up to detect a crack.

7. Select acceptable crack range


When you select Simple Crack Range or Conditional Crack Range you have the freedom to define your own custom parameters.
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).

8. (Optional) Include a seat tightness test


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.


9. (Optional) Select Custom Data Fields to be included with the test data


For more information on creating and adding custom data fields, see Add Custom Data Fields to your Data Sets.

10. Save the new test mode

Next Steps

Add the test to your FieldLab(s).

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 your FiedLab to perform a valve test.




    • Related Articles

    • Create and Edit a Valve Test for your FieldLab Digital Pressure Calibrator: Quick Overview

      This article provides a quick overview. For more detailed, step-by-step instructions, see: Create a custom Pressure Safety Valve / Pressure Relief Valve Test for a FieldLab This features requires FieldLab Desktop 1.24.0 or later. You can update to ...

    • Create Custom Pressure Units

      Learn how to create custom pressure units on the FieldLab Desktop software and add them to your Ralston devices. 1. From the "FieldLab Desktop" menu, select "Preferences" 2. Select "Custom Units" 3. In the Custom Units dialog box, choose "New" for a ...

    • Add Custom Data Fields to a Test

      Note: You may need to perform free updates to your FieldLab and FieldLab Desktop in order to use this feature. Available for FieldLab Desktop versions 1.10.0 and newer, and FieldLab Pressure Calibrator firmware v1.117 and newer.   Instructions for ...

    • Create a Custom Pressure Unit with a User-Defined Curve Fit

      Things you will need: The FieldLab Desktop app on your Windows computer. Version 1.40.4 or later. Update FieldLab Desktop to the Latest Version. A Ralston FieldLab Digital Pressure Calibrator, Field Gauge, or Process Meter In the FieldLab Desktop ...

    • Pressure Safety Valve (PSV) Test Report

      Results of PSV Test in both CSV and PDF format.

    • Recent Articles

    • Find the serial number and model for your Field Gauge LC20

      Located on the external casing of your Field Gauge All Field Gauge LC20s are shipped with a custom sticker that contains the following information. Model Number. Model numbers ending in B1 or W1 indicate the gauge has a wireless radio installed. B1 = ...

    • Troubleshoot USB Power Noise Causing Pressure Reading Drift on a Ralston Gauge

      Problem Unexpected pressure reading changes on an Ralston LC gauge when connected via USB. Root Cause Electrical noise is introduced through a low-quality USB hub and power supply interference. Noise from switch-mode power supplies (SMPS) can travel ...

    • Adjust Damping on your Ralston Gauge

      Damping slows the visual updates of a pressure gauge’s reading. The goal is to minimize minor fluctuations of the pressure reading on the screen caused by subtle variations in pressure that may create unwanted visual noise. Ralston gauges are set to ...

    • Register your Ralston Gauge

      Register your Ralston gauge to access calibration certificates and install firmware updates. This article applies to: FieldLab, Field Gauge LC10, LC20, and Process Meter LC30, all models. Things you will need: A PC running Windows. FieldLab Desktop ...

    • Look Up Lead Time and Pricing for a Ralston Product

      Go to ralstoninst.com Sign in to your Ralston account Select "Look Up Pricing and Lead Time by Model Number" Enter the model number of the Ralston product View the search results For each model number in your search results, info will be provided ...