How to Reduce Plant Downtime During Safety Valve Testing This Outage Season
Quick Answer: How Do You Reduce Plant Downtime During Safety Valve Testing?In-line testing reduces plant downtime by allowing pressure relief valves to remain installed while a technician verifies set pressure under normal operating conditions. This eliminates the removal-transport-reinstall cycle required for bench testing and allows appropriate valve testing to be completed without waiting for a planned shutdown. |
For maintenance teams preparing for outage season, that can mean fewer valves competing for limited outage time—and more of the maintenance window available for work that actually requires the equipment to be offline.
Outage season puts every maintenance team in the same bind: safety valve testing is essential, but maintenance windows are limited and every additional task adds pressure to the schedule.
The test itself often isn’t what consumes the most time. It’s how the testing gets done.
With the right in-line testing equipment, technicians can verify valve set pressure while the valve remains installed, reducing unnecessary removal and allowing appropriate testing to be performed while equipment remains in operation.
Key Takeaways:
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What Actually Causes Plant Downtime During Safety Valve Testing?
For valves that are bench tested, much of the downtime isn’t caused by the test itself. It comes from everything required to get the valve to and from the test bench.
The affected equipment may need to be taken out of service. The valve must be removed, transported to a testing location, tested and then reinstalled before the process can return to normal operation.
That removal-transport-reinstall cycle is where the hours can accumulate. It also introduces additional handling and reassembly steps that don’t exist when the valve can be tested in place.
Add outage timing to the equation and the stakes increase. Planned outages and turnarounds create compressed maintenance schedules, with multiple departments and contractors competing for the same limited window.
That makes an important planning question:
Which valve tests actually need to consume outage time?
When in-line testing is appropriate, some testing can be completed before the outage while the valve remains installed and the equipment remains under normal operating conditions. That allows the outage schedule to remain focused on maintenance activities that truly require shutdown.
- In-line testing verifies a pressure relief valve’s set pressure while it remains installed in its operating position.
- Bench testing requires removing the valve from the system and testing it on dedicated equipment in a controlled setting.
| See how much downtime your current testing process is costing you. |
How Much Does Valve Testing Downtime Actually Cost?.
Delays during a turnaround or planned outage can be expensive on an industrial scale.
Safety valve testing may represent only one part of a much larger maintenance scope, but a valve that is waiting for removal, testing, repair or reinstallation can still affect the overall schedule.
The impact becomes more significant across a facility with dozens or hundreds of valves.
Every valve that can appropriately be tested in-line before the outage represents one less removal, one less reinstallation and one less testing activity competing for limited maintenance time.
For maintenance teams, the value of in-line testing therefore isn’t simply that an individual test can be completed faster.
The larger opportunity is reducing the amount of testing that needs to be performed during the outage at all.
How Does In-Line Testing Help Maintenance Teams Reduce Plant Downtime?
In-line testing testing allows technicians to verify valve set pressure without removing the valve from the process system.
With AccuTEST, the valve remains installed and the test can be performed under normal operating conditions. That can reduce system downtime, eliminate unnecessary valve handling and give maintenance teams greater flexibility in deciding when testing is performed.
Here’s what that looks like in practice
1. Move Appropriate Valve Testing Outside the Outage Window
One of the most significant advantages of in-line testing is the ability to perform appropriate valve testing without waiting for a planned shutdown.
Instead of placing every scheduled valve test into the turnaround scope, maintenance teams can evaluate which valves can be tested in-line beforehand.
That can reduce the valve-testing workload during the outage and reserve valuable shutdown time for inspections, repairs and other maintenance that can only be completed when equipment is offline.
2. One Technician Can Perform the Complete Test
A single trained technician can set up, perform and document an AccuTEST in-line test.
That’s particularly valuable when skilled maintenance labor is limited or when multiple activities are competing for technicians during a turnaround.
The system’s automated operation, sensor verification and digital reporting also help standardize the testing process from one technician to another.
3. No Valve Removal or Reinstallation for In-Line Testing
Because the valve remains in its operating position, in-line testing eliminates the removal, transportation and reinstallation steps associated with bench testing.
That means fewer handling steps, less disruption to the process and less maintenance time devoted simply to moving the valve to and from a test location.
4. Computer-Controlled Force Application for Repeatable Results
Accurate measurement is only part of an accurate valve test. How the lifting force is applied also matters.
AccuTEST uses a computer-controlled electric drive to precisely control lifting force throughout the test, including the approach to the valve’s set point.
Smooth, controlled force application helps reduce force spikes and overshoot near the set point while minimizing operator-dependent variation. The result is consistent, repeatable testing from technician to technician.
For technicians who prefer direct control of the test, AccuTEST also provides Manual Mode. The technician controls the test while the electric motor continues to provide smooth, controlled force application.
This combination gives technicians control when they want it without returning to manual or hydraulic force application.
5. Automatic Test Results and Digital Reporting
AccuTEST software controls the test process, captures test data, calculates results and generates digital test records.
That reduces manual steps after the test and provides consistent documentation from one valve to the next.
During a large testing program, reducing the time spent documenting and organizing individual test results can be nearly as important as reducing the time required to perform the test itself.
Which AccuTEST System Fits Your Testing Program?
AccuTEST offers two primary system configurations designed around different operating requirements and budgets.
The AccuTEST-SL Performance Model provides the core AccuTEST automated testing capabilities with a rugged steel load rig and is well suited for general-purpose shop and in-line testing.
The AccuTEST-TT Premium Model adds additional sensor capabilities, advanced software features, automatic load-cell identification, a lightweight titanium load rig and battery operation for greater field portability.
Both systems use AccuTEST’s computer-controlled electric lifting technology rather than hydraulic force application.
| Explore AccuTEST’s in-line testing systems. |
Does In-Line Testing Replace Bench Testing Entirely?
No. In-line testing and bench testing serve different purposes.
In-line testing provides a way to verify valve set pressure while the valve remains installed and the process equipment remains under operating conditions.
Bench testing may still be appropriate or required when a valve needs to be removed for inspection, repair, disassembly or other testing, or when required by applicable codes, jurisdictional requirements, service conditions or facility procedures.
Rather than treating in-line and bench testing as competing methods, maintenance teams can use each where it makes the most sense.
The goal is to avoid removing a valve—and consuming valuable shutdown time—when the required verification can appropriately be performed in-line.
When Should You Use In-Line Testing vs. Bench Testing? | |
|---|---|
| Situation: | Typical Approach: |
| Set-pressure verification that can be performed with the valve installed | In-line testing |
| Testing that can appropriately be completed while equipment remains in operation | In-line testing |
| Valve requires internal inspection, disassembly, or repair | Bench testing |
| Applicable requirements specifically call for valve removal or bench testing | Bench testing |
| Testing during a planned shutdown or turnaround | Depends on test scope and facility requirements |
| Valve testing that can be completed before a planned outage | Consider in-line testing |
| New valve requiring complete verification before installation | Bench testing |
The appropriate method should always be determined by the valve application, applicable requirements and the facility’s testing and maintenance procedures.
How Can Maintenance Teams Prepare Before Outage Season Hits?
The best time to evaluate your testing equipment is before the maintenance window begins—not when every hour of the outage is already allocated.
Start by looking at the valves scheduled for testing.
Which valves actually need to be removed during the outage, and which could appropriately be verified in-line beforehand?
Then evaluate the equipment your technicians will be relying on.
Legacy hydraulic and manually controlled systems can introduce additional equipment, setup requirements and operator-dependent variability. Those limitations become more significant when technicians are working through a compressed maintenance schedule.
Modern electric-drive testing equipment can simplify setup, reduce equipment bulk and provide more consistent control over force application.
That’s the gap the AccuTEST Trade-In Program is designed to address.
Facilities can trade in qualifying valve-testing equipment from AccuTEST or other manufacturers and receive credit toward a current AccuTEST system.
Upgrading before outage season also gives teams time to standardize equipment, train technicians and confirm system readiness before the maintenance schedule becomes critical.
| See if your current equipment qualifies for an upgrade. |
Older Testing Equipment vs. AccuTEST In-Line Systems | ||
|---|---|---|
| Testing Consideration: | Legacy Manual/Hydraulic Equipment: | AccuTEST In-Line Systems: |
| Force Application | May depend more heavily on technician operation | Computer-controlled electric drive |
| Operator Variability | Greater potential for technician-dependent force application | Controlled force application helps reduce variability |
| Valve Removal | Depends on testing method and equipment | Not required for in-line testing |
| Test Operation | May require additional manual steps | Automated test control with Manual Mode available |
| Crew Requirements | Can require additional personnel depending on equipment and procedure | Designed for one-technician operation |
| Sensor Verification | Depends on equipment | Built-in sensor verification and fault checking |
| Reporting | May require manual documentation | Automatic digital test records and reports |
| Hydraulic Equipment | Pumps, hoses, and hydraulic components may be required | No hydraulic lifting system |
| Portability | Varies by system | Compact field configuration; TT includes lightweight titanium load rig |
What Should Maintenance Teams Look for in In-Line Testing Equipment?
When evaluating whether your current equipment is ready for another outage season, look beyond whether the system can simply generate enough force to lift the valve.
The testing system should give technicians:
Controlled force application, particularly as the valve approaches its set point
- Accurate force and pressure measurement
- Repeatable results from technician to technician
- In-line capability so appropriate tests don’t require valve removal
- Automated test control with technician control available when needed
- Single-technician operation to make efficient use of skilled labor
- Automatic sensor verification and fault checking
- Digital test records and reporting
- Portable equipment suitable for actual plant conditions
- Responsive technical support when technicians need assistance in the field
If your current equipment is missing several of these capabilities, it may be worth evaluating an upgrade before your next outage window.
Frequently Asked Questions
What is in-line safety valve testing?
In-line testing verifies a pressure relief valve’s set pressure while the valve remains installed in its operating position. The test uses the existing system pressure together with a controlled external lifting force to determine the valve’s set pressure without removing it for bench testing.
How does in-line testing reduce plant downtime?
In-line testing eliminates the need to remove, transport and reinstall a valve when set-pressure verification can appropriately be performed with the valve installed.
It can also allow maintenance teams to complete appropriate valve testing before a planned outage, reducing the number of testing activities competing for limited shutdown time.
Can in-line testing fully replace bench testing?
No. Bench testing may still be required or appropriate when a valve needs inspection, repair, disassembly or other testing, or based on applicable codes, jurisdictional requirements, service conditions or facility procedures.
In-line testing gives maintenance teams another option when valve performance can appropriately be verified without removal.
Does in-line testing require the equipment to be shut down?
One of the primary advantages of in-line testing is that the valve can be tested while it remains installed and the process equipment remains under operating conditions.
The appropriate test procedure depends on the valve, application and facility requirements.
Why does valve removal add so much downtime?
Valve removal can require process shutdown or isolation, disassembly, transportation to a testing location and reinstallation after testing. Each step adds labor and time beyond the test itself.
In-line testing eliminates those steps when removal isn’t required.
Why does controlled force application matter during safety valve testing?
The external lifting force must be applied smoothly and precisely as the valve approaches its set point.
Manual or inconsistent force application can introduce spikes, overshoot and operator-dependent variation. AccuTEST uses a computer-controlled electric drive to apply smooth, controlled force throughout the test, helping produce consistent, repeatable results.
Can the technician manually control an AccuTEST test?
Yes. AccuTEST provides automated testing as well as Manual Mode.
In Manual Mode, the technician retains control of the test while the computer-controlled electric motor provides smooth force application. This gives technicians direct control without requiring a hand jack or hydraulic lifting system.
Can one technician perform an AccuTEST in-line test?
Yes. AccuTEST systems are designed for one-technician operation. A trained technician can set up the equipment, perform the test and generate the test record without requiring a second technician simply to operate the testing equipment.
How accurate are AccuTEST measurements?
Accurate valve testing depends on both measurement accuracy and controlled force application.
AccuTEST uses calibrated load and pressure sensors together with automatic sensor verification and fault checking. AccuTEST load cells have an accuracy of ±0.075% FS.
The computer-controlled electric drive also helps reduce operator-dependent variability by applying smooth, controlled lifting force throughout the test.
What is the difference between the AccuTEST-SL and AccuTEST-TT?
The AccuTEST-SL is the Performance Model and provides AccuTEST’s core automated testing capabilities with a rugged steel load rig.
The AccuTEST-TT is the Premium Model and adds additional sensor capabilities, advanced software features, automatic load-cell identification, a lightweight titanium load rig, battery operation and additional field-oriented features.
Both systems use AccuTEST’s computer-controlled electric lifting technology.
What is the AccuTEST Trade-In Program?
The AccuTEST Trade-In Program provides facilities and valve service companies with a path to upgrade older valve-testing equipment.
Qualifying equipment can be traded in for credit toward a current AccuTEST system, allowing teams to modernize their testing equipment before aging systems become a limitation during a critical maintenance window.
Ready to Get Ahead of Outage Season?
The best way to reduce valve-testing pressure during an outage may be to complete more of the appropriate testing before the outage begins.
Review your upcoming valve-testing schedule, identify which valves may be candidates for in-line testing, and make sure your technicians have equipment capable of producing accurate, repeatable results without unnecessary valve removal.
Talk to an AccuTEST expert about evaluating your current testing equipment, or explore the AccuTEST Trade-In Program to see what an upgrade path could look like for your plant.
