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Performance Standard for Lever Hoists 2017 — Performance Standard for Lever Hoists
🪝 A lever hoist — also called a ratchet lever hoist, ratchet chain hoist, or “come-along” — is a manually operated lifting device in which the operator reciprocates a lever handle to drive a ratchet-and-pawl mechanism and reduction gearing, lifting and lowering a load chain. The 2017 edition of the Performance Standard for Lever Hoists defines the performance requirements that such products must meet in design, manufacture, and acceptance, including rated load, static (proof) testing, overload protection, and the technical requirements for load chain, hooks, and other critical components, together with a testing and marking framework consistent with ASME HST-5 (Performance Standard for Ratchet Lever Hoists). It serves as the authoritative technical basis for the selection, procurement, and use of lever hoists.
💡 A performance standard answers “how much load the hoist can safely carry, and how that is verified”; a safety standard (e.g., ASME B30.21) answers “how the hoist must be used safely on site”. The two work together, covering the product and its application respectively.
1. Scope and Positioning 📌
This performance standard applies to manually operated lever-type (ratchet lever) chain hoists — hoists whose lifting, lowering, and positioning are driven by reciprocating the handle. Such tools are widely used for equipment installation, maintenance hoisting, pipework erection, structural-steel work, rigging tensioning, and temporary hauling. The main elements defined by the standard are:
- the determination and series classification of the rated load;
- the procedures and acceptance criteria for verification testing (static loading and overload-protection tests);
- material and performance requirements for the load chain, hooks, handle, brake mechanism, and housing;
- requirements for marking, nameplates, and accompanying documentation.
Unlike electric or air-powered hoists, a lever hoist is driven by human power, so the performance standard focuses on ensuring the mechanism cannot fail under overload in any operating condition, while placing clear verification requirements on operating effort and brake reliability.
⚠️ Testing requirements in a performance standard target new-product acceptance and type testing. Periodic inspection, retirement criteria, and use limits for hoists in service must also follow the applicable safety standard (e.g., ASME B30.21) and the manufacturer’s instructions.
2. Rated Load and Testing Requirements 🔬
The rated load of lever hoists is classified into a standard series, with common ratings from 0.75 t up to 9 t. To verify product performance, the standard requires the following tests:
| Test | Test Load | Acceptance Criteria |
|---|---|---|
| Rated-load operation test | 100% of rated load | Smooth lift/lower, reliable brake, reasonable handle effort |
| Static (overload) proof test | 150% of rated load (typical) | No permanent deformation or cracks; mechanism functional after test |
| Overload-protection verification | Triggering of the protective device | Slippage/disengagement on overload without damage to chain or brake |
| Chain and hook breaking | Sample destructive test | Breaking load meets the safety-factor requirement (typically ≥4–5 × rated load) |
Tests are performed with the hoist correctly suspended and loaded, applying the load slowly and without shock. After the static proof test the mechanism must continue to operate normally; any plastic deformation, cracking, or functional failure of a component constitutes nonconformance.
🚨 Never interpret the static proof test as permission to overload in service. The 150% proof load is an acceptance tool only — the working limit is the rated load marked on the nameplate. Overloading causes brake failure, permanent chain stretch, and possible load drop.
3. Critical Component Requirements 🔩
- Load chain: high-strength alloy-steel link chain; link dimensions, weld quality, and pitch tolerances must meet the standard, with factory tensile testing and a guaranteed breaking load.
- Hooks: top and bottom hooks must have adequate strength and be fitted with safety latches (anti-detachment devices); hooks whose throat opening deforms beyond the limit are rejected.
- Brake: a mechanical friction brake (brake disc/pawl) that holds the load at any position without creep; brake surfaces must stay free of oil and dirt.
- Ratchet-pawl and gearing: reliable stepwise drive when the handle is operated, positive locking on the reverse stroke, and replacement when wear exceeds limits.
- Housing and handle: cast-aluminum or steel housings must withstand the test load; the handle should provide overload indication or work with the overload-protection device.
4. Marking and Documentation 🏷️
The standard requires each lever hoist to carry a durable nameplate clearly stating: the manufacturer’s name or trademark, model designation, rated load, standard number, and serial number. Accompanying documents must include an instruction manual, a test certificate, and warranty information. Markings must remain legible and must not be obscured by paint or dirt during service.
5. Engineering Practice Essentials ✅
- 🔍 Selection: size the rated load from the maximum lifting load including rigging and impact factors, with adequate margin; choose shorter-lever, higher-ratio models for confined spaces and frequent tensioning duties.
- 🧴 Lubrication and maintenance: lubricate the chain regularly with a suitable oil; keep the brake mechanism free of oil; inspect pawls and gearing for wear.
- 📋 Periodic inspection: keep a register and perform no-load and rated-load checks on schedule; take the hoist out of service immediately on chain stretch, hook deformation, or brake creep.
- 🪢 Use discipline: verify the load does not exceed the rating before lifting, keep the chain free of twists, confirm the hook latch is engaged, and never leave a lever hoist permanently under load as a tensioned rigging element.
6. Frequently Asked Questions ❓
❓ Q: What is the difference between a lever hoist and a hand chain block?
A: A chain block is driven by pulling an endless hand chain through gearing, while a lever hoist is driven by reciprocating a lever handle through a ratchet mechanism, enabling fine positioning in short strokes and convenient tensioning and hauling. The testing logic is similar, but brake and indexing performance are assessed differently.
A: A chain block is driven by pulling an endless hand chain through gearing, while a lever hoist is driven by reciprocating a lever handle through a ratchet mechanism, enabling fine positioning in short strokes and convenient tensioning and hauling. The testing logic is similar, but brake and indexing performance are assessed differently.
❓ Q: If a hoist passes the 150% static proof test, can it occasionally be overloaded?
A: No. The proof test validates design margin and manufacturing quality at acceptance; it does not change the working limit defined by the rated load. Any overload use violates the intent of the standard and introduces a risk of load drop.
A: No. The proof test validates design margin and manufacturing quality at acceptance; it does not change the working limit defined by the rated load. Any overload use violates the intent of the standard and introduces a risk of load drop.
❓ Q: How should brake creep be judged?
A: With the rated load applied, the load must not drift downward after the hoist is stopped at any position. Noticeable creep indicates a worn or contaminated brake disc and requires immediate removal from service for repair; continued use is prohibited.
A: With the rated load applied, the load must not drift downward after the hoist is stopped at any position. Noticeable creep indicates a worn or contaminated brake disc and requires immediate removal from service for repair; continued use is prohibited.
❓ Q: How does this performance standard relate to ASME HST-5?
A: ASME HST-5, Performance Standard for Ratchet Lever Hoists, is the authoritative performance specification for this product class. This 2017 performance standard shares its testing items, acceptance criteria, and marking requirements and may be used interchangeably as a reference.
A: ASME HST-5, Performance Standard for Ratchet Lever Hoists, is the authoritative performance specification for this product class. This 2017 performance standard shares its testing items, acceptance criteria, and marking requirements and may be used interchangeably as a reference.
