Proof load testing is a controlled test in which a piece of lifting equipment or an accessory is loaded beyond its rated capacity, under strict conditions, to confirm it can safely handle the load it is designed for. It is carried out before equipment enters service and at defined intervals afterwards, and it forms part of the wider inspection and certification process that keeps lifting operations safe.
Why Is Proof Load Testing Required?
In the UK, lifting equipment is covered by the Lifting Operations and Lifting Equipment Regulations, commonly known as LOLER.
Proof load testing requirements under LOLER exist to confirm that equipment is strong enough for its intended use before it is put into service, and that it continues to perform safely as it ages and wears. Without a valid proof load test, equipment cannot be certified as fit for use, regardless of how new or well maintained it appears.
How Does Proof Load Testing Work?
During a proof load test, the equipment is loaded to a specified percentage above its rated capacity, typically in the region of 25 to 50 percent depending on the equipment type and applicable standard. The load is applied gradually and held for a set period while the equipment is inspected for deformation, cracking or other signs of weakness. If the equipment passes without damage, it is certified as fit for use at its rated capacity.
Proof Load Testing Certification
A successful proof load test results in a certificate confirming the date of testing, the load applied and the outcome. This certificate should be kept alongside other lifting equipment records and produced during any inspection or audit.
Proof load certification is separate from, but closely linked to, the safe working load marked on the equipment, since the proof load confirms the margin of safety built above that rated figure.
Proof Load Testing Requirements in the UK
UK proof load testing requirements vary depending on the type of equipment and the standard it falls under, but the underlying principle is consistent. Equipment must be tested before first use, after any significant repair or modification, and at scheduled intervals as part of ongoing thorough examination. It is worth understanding the difference between WLL and SWL as part of this process, since both figures are referenced during testing and certification.
Which Equipment Needs Proof Load Testing?
Proof load testing applies to most lifting equipment and accessories, including hoists, balancers and winches, overhead cranes, chains, slings, shackles and lifting hooks. The hooks and safety latches fitted to lifting equipment are a common focus of testing, since they are often the single point on which a load is suspended.
Discuss Proof Load Testing With Metreel
As specialists in mechanical handling equipment, Metreel can advise on proof load testing requirements for new and existing lifting equipment.
To discuss testing, certification or your wider lifting equipment needs, call our team on 0115 932 7010.