Single lifting test trial

Single Lifting Test Trial – Validating Lifting Capacity and Safety for Brazilian Operations

As an ISO/IEC 17025 accredited independent testing laboratory, we offer dedicated single lifting test trials for lifting appliances, load‑bearing attachments, and rigging components used across Brazilian construction, mining, offshore, and industrial sectors. A single lifting test trial subjects each individual lifting item – whether a sling, chain, shackle, lifting beam, or eye bolt – to a controlled proof‑load or ultimate‑strength test that verifies its rated capacity and structural integrity before it is placed into service or after repair/re‑certification. Our procedures are strictly aligned with ABNT NBR standards, NR‑12 and NR‑37 safety regulations, INMETRO requirements for lifting equipment, and international norms such as EN 13414, ASME B30.9, and ISO 1835. We issue detailed, traceable test reports that are recognised by ANP (for offshore oil‑and‑gas), DNIT (infrastructure projects), and state labour agencies, ensuring that your lifting gear meets both regulatory demands and operational reliability expectations.

Lifting Gear and Components We Regularly Test in Single Lift Trials

Our test bay accommodates a wide range of lifting devices and accessories, with capacities from 0.5 t up to 500 t. Typical test articles include:

• Wire rope slings – single‑leg, multi‑leg, and endless round‑sling constructions
• Chain slings and chain assemblies – grade 8, grade 10, and alloy steel chains with master links and hooks
• Synthetic web slings – flat webbing slings and endless roundslings (polyester, nylon, or polypropylene)
• Shackles and connecting links – bow, D‑type, and screw‑pin shackles, plus pear‑shaped links
• Lifting hooks, eye bolts, and swivel hoist rings – with threaded or captive shanks
• Spreader beams and lifting frames – fabricated steel beams with pad‑eyes and lifting lugs
• Turnbuckles, wire rope clips, and thimbles – for terminations and tensioning applications
• Offshore lifting points and pad‑eyes – welded or bolted lifting attachments for subsea or topside use

Proof‑Load (Static Verification) Test – Confirming Rated Working Load

• Application of test load (proof load) – Each lifting component is mounted in our universal hydraulic test frame (capacity up to 5,000 kN) and subjected to a controlled static tensile force equal to 1.25 × Working Load Limit (WLL) or 2.0 × WLL depending on the product standard (e.g., EN 13414‑1 requires 1.5 × WLL for chain slings; ASME B30.9 specifies 1.25 × WLL for shackles). The load is applied smoothly, held for a minimum of 60 seconds, and then released.
• Permanent deformation measurement – Before and after the proof‑load application, we measure critical dimensions (e.g., internal width of shackle, length of sling, hook opening) using calibrated callipers and laser micrometers. Any permanent elongation exceeding 0.5 % of the original gauge length, or any deformation that prevents proper engagement, constitutes a failure. Results are recorded with an uncertainty of ±0.1 mm.
• Visual inspection after proof‑load – We perform a 10× magnification visual inspection (and dye‑penetrant or magnetic particle on ferrous components) to detect surface cracks, necking, or thread damage. The inspection follows ISO 3059 and ASTM E165; all findings are documented with photographs.
• Load‑deflection curve analysis – Our digital controller records the applied force and the corresponding extension or displacement in real time, generating a load‑elongation curve. The curve is analysed for linearity, yield point, and any sudden load drops that indicate incipient failure. This data is included in the final report as a graphical annex.

Dynamic (Impact) Lifting Test – Simulating Operational Shock Loading

• Impact load application – For lifting components that may experience rapid engagement or shock loads (e.g., crane hoisting, offshore snap‑loading), we perform a dynamic test by suddenly releasing a proof‑mass from a controlled drop height to generate a defined impulse. The test is conducted per EN 13414‑2 (annex D for dynamic testing) and ASME B30.20, with the impact force monitored by a high‑speed load cell (sampling at 10 kHz).
• Peak force and duration recording – We capture the maximum dynamic force (which can exceed the static proof load by a factor of 1.2‑1.5) and the duration of the impulse. The component must sustain the impact without permanent deformation or fracture; the pass/fail criterion is set at ≤ 1.1 × WLL residual deformation after impact.
• Resonance and vibration monitoring – Accelerometers are attached to the component and its attachments to record the vibration response during dynamic loading. Any abnormal resonant amplification is noted, and the natural frequency is estimated – a key parameter for ensuring that the lifting gear does not couple with crane-induced oscillations in Brazilian offshore or construction environments.

Ultimate‑Strength (Destructive) Test – Determination of Breaking Load and Factor of Safety

• Incremental loading to failure – For qualification of new designs, or when a client requests a margin‑of‑safety verification, we perform a destructive test by continuously increasing the tensile force at a controlled rate (typically 0.5 % of WLL per second) until the component fractures or yields beyond recovery. The test follows ISO 2309 (for wire ropes) and ASTM E8 (for metallic components adapted to lifting).
• Recording of ultimate tensile strength (UTS) and elongation at fracture – We record the maximum force sustained (breaking load) and the total extension at break. From these, we calculate the actual factor of safety (breaking load / WLL) and compare it to the design minimum (typically 4:1 for chain, 5:1 for wire rope, 7:1 for synthetic slings). A safety factor below the required value is reported as a critical non‑conformity.
• Failure mode analysis – Fracture surfaces are examined using stereomicroscopy and scanning electron microscopy (SEM) to identify ductile, brittle, or fatigue failure mechanisms. We provide a detailed failure‑mode report with high‑resolution images, which is invaluable for root‑cause analysis and design improvement.
• Residual strength after proof‑load (for multi‑use components) – For components that have already passed a proof‑load, we occasionally perform a subsequent destructive test on a sister sample to verify that the proof‑load did not degrade the material. The ultimate strength must remain within 5 % of the un‑tested sample’s average – confirming the non‑destructive nature of the proof‑load procedure.

Length, Marking and Traceability Verification – Complementary Assessments

• Overall length and effective working length measurement – Before and after the lifting trial, we measure the total length of the sling or assembly using a steel tape (certified to ISO 7494) under a specified initial tension (e.g., 2 % of WLL). Any change greater than 2 % is reported as an elongation anomaly.
• Identification and marking check – We verify that the component carries a permanent, legible marking indicating the WLL, manufacturer, batch number, and the standard to which it is manufactured (e.g., EN 818‑2 for chain, ASME B30.9 for shackles). Missing or illegible markings are recorded and a non‑conformity note is issued, per ABNT NBR 15522 (identification of lifting accessories).
• Traceability to material certificates – When provided, we cross‑reference the component’s heat number and batch code with the mill test certificates (MTCs). The chemical composition and hardness are verified on a sample coupon (if available) using portable optical emission spectrometry (OES) to ensure consistency with the rated grade.

Report Acceptance & Compliance with Brazilian Safety and Regulatory Frameworks

All single lifting test trials described above are performed under our ISO/IEC 17025:2017 accreditation, with our 5,000 kN hydraulic test machine calibrated annually by an external, traceable calibration body, and all load‑cells recalibrated before each test series. Our final reports contain: a full description of the test item (including drawings and photographs), test conditions (load application rate, hold time, ambient temperature), raw data tables, load‑elongation and load‑time curves, dimensional measurements before/after, inspection findings, and a clear overall verdict (pass / conditional pass / fail). We also include an uncertainty statement for the measured forces (±1 % of reading) and dimensions (±0.1 mm). These reports are routinely accepted by INMETRO for equipment registration, by ANP for offshore safety cases, by DNIT for bridge‑construction lifting plans, and by Brazilian labour inspectors (MTE) during site audits. We supply bilingual (Portuguese/English) versions to streamline your interactions with local authorities and your engineering team, ensuring that every lifting component you place into service is documented with the accuracy, traceability, and professional depth that our Brazilian clients require for safe and compliant operations.