Proof load testing is a controlled way to confirm that a piece of rigging equipment can safely handle its rated capacity before it goes to work. In simple terms, it is a verification step, not a guess.
The test applies a predetermined load, observes performance, and documents the results for your records. It is not destructive. The goal is confidence and compliance before the first lift.
Proof load test vs. break test
- Proof load test: A non-destructive check. Your gear is loaded to a specified level to verify that it performs as intended and shows no concerning deformation. Use it to commission new gear, validate repairs, and satisfy specifications.
- Break test: A destructive test. The equipment is loaded until failure to establish or validate ultimate strength and provide documentation. Southwest Wire Rope can perform proof and break testing, with capacity up to 1.7 million pounds.
Common misconceptions
- It replaces inspections: Proof loading confirms capacity under controlled conditions, but it does not eliminate the need for daily or periodic inspections.
- It must deform the gear: Properly executed proof tests are non-destructive and should not leave permanent set.
- One certificate lasts forever: Documentation reflects the configuration and date tested; modifications, repairs, or heavy incidents warrant retesting. Pair tests with a clean ID tag and traceable record.
How a proof load test works
- Plan the test. Define the target load, fixtures, lift points, and pass/fail criteria in advance. Keep it plain language so everyone understands what “success” looks like.
- Apply a predetermined load. The equipment is loaded in controlled steps to a specified level, commonly in the range of about 1.1 to 1.5 times the design working load, then held and observed.
- Measure and observe. Technicians watch for permanent deformation, unusual stretch, hardware issues, or anything that would compromise safe use.
- Document the results. You receive an audit-ready report, with photos and measurements tied to the asset ID. Records can be managed digitally through Tessalink for easy retrieval.
Why proof load testing matters
- Verify safety before the first lift. A proof load test confirms that the gear you rely on performs to spec in the real world, not just on paper.
- Meet standards and satisfy reviews. Clear, consistent documentation supports compliance requests from customers, auditors, and insurers.
- Reduce downtime and risk. Catching issues in a controlled setting is far better than discovering them under a suspended load.
- Extend service life. Early detection of wear or configuration problems helps you correct course before damage accelerates.
When to schedule a proof load test
- Commissioning: New or newly configured assemblies before they enter service.
- Post-repair: After any structural repair or critical component swap.
- By specification: When customers, projects, or internal procedures require a proof load.
- Alongside inspections: Pair periodic inspections with a testing cadence for critical gear so records stay current.
What to expect from SWR testing
Southwest Wire Rope provides professional proof load and break testing, both on-site and in-house, performed by experienced inspectors following strict safety protocols. Deliverables include detailed, compliance-ready reporting and photo documentation. Capacity reaches up to 1.7 million pounds for heavy projects. Test before you trust, and load with confidence.
Quick checklist
- The right fixtures and lift points are planned in advance
- Target load and hold time are clearly defined
- Technicians document measurements and observations
- Pass/fail criteria are plain and consistent
- Final report is stored with the asset ID for future audits
Ready to schedule a proof load test? Explore our testing and inspection services or contact us for a quote and scheduling.