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ASME PALD 11b-1988 — Wheel Dollies Addenda (b)
📐 ASME PALD 11b-1988 is Addenda (b) to ASME/ANSI PALD 11-1986, the Wheel Dollies volume of the Safety Standards for Portable Automotive Lifting Devices. Approved by ANSI on October 6, 1988, and issued December 31, 1988, it continues the replacement-page revision of the 1986 edition; fewer changes are flagged (b) while the previous addenda’s changes are flagged (a). This addenda focuses on the proof load definition, design clauses, qualification testing clauses, and product instruction and warning provisions, making the technical content more rigorous.
💡 Addenda (b) and (a) apply cumulatively. When checking clauses, (b) flags this addenda’s changes and (a) the previous addenda’s; consult both together with the 1986 base text.
1. Main Revisions in Addenda (b) 📌
PALD 11b-1988 revises the General (Introduction) and Section 1, the proof load definition in Section 2, design clauses 3.1 and 3.4, qualification testing clauses 5.1.2, 5.1.3.5, and 5.1.3.6, Section 6, and clause 7.1.3. The proof load definition revision keeps terminology consistent with the design qualification testing requirements, while the design and testing clause revisions further define the load-carrying and verification requirements of wheel dollies.
| Location | Clause | Change |
|---|---|---|
| Introduction | General / Section 1 | Editorially revised; General second paragraph revised; Section 1 revised |
| Section 2 | Proof load definition | Revised |
| 3.1 / 3.4 | Design | 3.1 revised; 3.4 revised |
| 5.1.2 | Qualification testing | Revised |
| 5.1.3.5 / 5.1.3.6 | Qualification testing | Revised |
| Section 6 / 7.1.3 | Instructions & warnings | Section 6 revised; 7.1.3 (b) revised |
⚠️ Addenda (b) revises the qualification testing clauses 5.1.2, 5.1.3.5, and 5.1.3.6. Inspectors must use the latest testing requirements rather than the old text.
2. Proof Load Definition and Test Requirements 📏
This addenda revises the proof load definition in Section 2 so it agrees with the proof load test requirements in Section 5. In the wheel dolly system, the proof load test requires a manufacturing sample to carry a multiple of rated capacity and show no structural failure, functional damage, or excessive permanent deformation within the specified hold time. Consistency between definition and testing clauses makes acceptance criteria clearer and easier to apply in manufacturing and inspection.
🚨 Passing the proof load test only confirms that the design–manufacture combination meets safety requirements; it never authorizes routine overload. The daily operating limit of a wheel dolly is its rated capacity.
3. Wheel Dolly Technical Requirement Essentials 🛠️
Wheel dollies support and move wheels, tires, and brake assemblies. Core design requirements: the lifting frame and rollers must show no functional damage at rated capacity, remain stable on hard level ground, rollers turn freely, and adjustable mechanisms lock reliably. The revised design and testing clauses further define how these requirements are verified.
| Item | Typical Requirement | Verification |
|---|---|---|
| Proof load | Multiple of rated capacity without damage | Proof load test (type test) |
| Stability | No tipping on hard level surface | Stability test + pre-use check |
| Roller function | Free rotation under load | Function test + periodic inspection |
| Adjustable mechanism | Firm, reliable locking | Adjustment and locking test |
| Warnings & instructions | Complete hazard warnings and instructions | Revised Section 6 and 7.1.3 |
4. Engineering Practice Essentials 🚧
- 🔍 Testing update: inspection documents should apply the revised testing clauses (5.1.2, 5.1.3.5, 5.1.3.6) from this addenda.
- 🔧 Definition alignment: put the proof load definition and acceptance criteria into inspection forms so everyone applies the same basis.
- 📋 Version management: keep “PALD 11-1986 + 11a-1987 + 11b-1988” as one complete set.
- 📊 Site compliance: wheel dollies only support and move wheel components — never substitute for support stands or carry whole-vehicle loads.
💡 Addenda (b) keeps improving the standard: the unified proof load definition and revised testing clauses make the manufacturing and inspection basis for wheel dollies clearer and more enforceable.
5. Frequently Asked Questions ❓
❓ Q: What are the core changes in PALD 11b-1988?
A: The proof load definition, design clauses 3.1 and 3.4, qualification testing clauses 5.1.2, 5.1.3.5, 5.1.3.6, and the Section 6 and 7.1.3 warning provisions.
A: The proof load definition, design clauses 3.1 and 3.4, qualification testing clauses 5.1.2, 5.1.3.5, 5.1.3.6, and the Section 6 and 7.1.3 warning provisions.
❓ Q: Why was the proof load definition revised?
A: To keep terminology consistent with design qualification testing, clarifying the load magnitude, test conditions, and acceptance criteria and reducing ambiguity in manufacturing and inspection.
A: To keep terminology consistent with design qualification testing, clarifying the load magnitude, test conditions, and acceptance criteria and reducing ambiguity in manufacturing and inspection.
❓ Q: What does Addenda (b) require of inspectors?
A: Apply the revised testing clauses as criteria, update inspection forms, and retain the replacement pages for traceability.
A: Apply the revised testing clauses as criteria, update inspection forms, and retain the replacement pages for traceability.
❓ Q: What if Addenda (b) and (a) conflict?
A: Addenda (b) is the newer revision; its (b)-flagged changes supersede the corresponding (a) areas. Both remain part of the current text — read them cumulatively, with the newer addenda prevailing for the same area.
A: Addenda (b) is the newer revision; its (b)-flagged changes supersede the corresponding (a) areas. Both remain part of the current text — read them cumulatively, with the newer addenda prevailing for the same area.
