Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
ASME PALD 1b-1991 — Hydraulic Hand Jacks Safety Standard Addenda (b)
🔧 ASME/ANSI PALD-1b-1991 is the second Addenda to ASME/ANSI PALD-1-1988, the Hydraulic Hand Jacks volume of the Safety Standard for Portable Automotive Lifting Devices. It was approved by ANSI on February 14, 1991, and issued on April 30, 1991, following the first Addenda (PALD-1a-1989). Compared with the first Addenda, this document reaches much farther across the standard, with the most significant work concentrated in the definition framework and the design qualification testing paragraphs — an important step toward terminological rigor and full technical coverage.
💡 A standard is only as enforceable as its definitions are precise. Terms such as “functional damage,” “portable,” “manufacturer,” “repair,” and “supplier” determine the pass/fail boundaries of qualification tests, the allocation of responsibility, and whether a repaired unit remains compliant.
1. Overview of Changes 📌
This Addenda is issued as replacement pages, with changes marked by the margin note (b); earlier Addenda changes are marked (a). The revisions span the table of contents, Sections 1 through 7, and represent a systematic update:
| Page | Location | Change |
|---|---|---|
| vii | Contents | Updated to reflect the Addenda |
| 5–7 | Paras. 1.1, 1.2, 1.3, 1.4 | All revised |
| 5 | Section 2 — Definitions | (1) The following definitions revised: functional damage, portable, manufacturer, repair, supplier; (2) additional definitions added |
| 6 | Para. 3.3 | Paragraphs (a) and (b) revised |
| 6 | Para. 3.4 | Title and paragraph revised |
| 7 | Para. 4.1 | Revised |
| 7 | Para. 4.2 | Revised |
| 8 | Para. 5.1 | Revised |
| 8 | Section 6 | Revised |
| 9 | Para. 7.1.4 | Revised |
| 9 | Para. 7.1.5 | Revised |
2. Revised Key Definitions 🔬
The definition changes in this Addenda are substantive. The most representative is functional damage: any detrimental permanent deformation of the jack’s structure that results in loss of sealing capability of the hydraulic and/or pneumatic components, loss of load, or failure to meet or exceed the design qualification limits established in Section 5. This ties “permanent structural deformation” directly to “loss of function,” removing subjective judgment from test acceptance.
- Portable: defines the transportable nature of the equipment, bounding the equipment configurations covered by the standard.
- Manufacturer: a company that produces goods by hand or machinery, often on a large scale — the primary safety-responsible party.
- Repair: the restoration of a damaged or failed component; a repaired jack must again satisfy the applicable safety requirements.
- Supplier: the distribution-chain party that must furnish correct operating and maintenance instructions to users.
⚠️ Repair and modification are fundamentally different. A repair performed and verified in accordance with the Standard restores compliance; an unauthorized modification of structure, capacity, or the hydraulic system can take the equipment outside the Standard, with all safety and legal responsibility falling on the user.
3. Technical Requirements and Qualification Testing 🛠️
The revised paras. 1.1 through 1.4 sharpen the scope, purpose, classification, and illustrations: the volume applies to self-contained hydraulic hand jacks designed for lifting, but not sustaining, loads in the vertical (primary) or horizontal (secondary) directions, limited to jacks of 30 ton (27,000 kg) rated capacity or less, and excluding hydraulic bumper jacks. Design qualification testing (Section 5) is the key gate for verifying safety:
- Test objects: every model and size must pass design qualification testing, verifying structural integrity and functional reliability at rated load and proof load.
- Acceptance criteria: after testing there must be no “functional damage” — no permanent deformation that causes loss of sealing, loss of load, or excursions beyond the qualification limits.
- Marking and instructions (Sections 4 and 6): markings must state rated capacity and manufacturer identity; instructions and warnings must cover lifting limits, floor conditions, load centering, and prohibited practices.
- Use and maintenance (Section 7): the revised paras. 7.1.4 and 7.1.5 strengthen routine inspection items and periodic examination, including hydraulic leaks, saddle and linkage wear, and release-valve function.
🚨 A jack is equipment with direct life-safety exposure. Structural changes made without design qualification testing, use beyond rated capacity, or operation on anything other than a hard, level surface can drop the vehicle and cause serious injury or death.
In practice, qualification records should identify the exact edition and Addenda under which each test was performed — for example “tested to ASME/ANSI PALD-1-1988 including 1a-1989 and 1b-1991” — so that results remain comparable as the text evolves and the responsible parties (manufacturer, supplier, and repairer) stay clearly attributable.
4. Engineering Practice Essentials 📋
- 📑 Version control: the currently effective text is PALD-1-1988 (base) plus PALD-1a-1989 plus PALD-1b-1991 — all three parts are required.
- 🔍 Supplier verification: require suppliers to provide product instructions and design qualification test reports consistent with the revised definitions, and clarify the responsibility boundary between “manufacturer” and “supplier.”
- 🔧 Repair management: repairs must be performed by capable personnel following the manufacturer’s instructions; after repair, re-check sealing and load capacity and log the work in the equipment record.
- 👷 Operator training: training should cover the “lift, do not sustain” principle, load centering, floor-condition judgment, and emergency response.
5. Frequently Asked Questions ❓
❓ Q: How do PALD-1b-1991 and PALD-1a-1989 relate?
A: Both are Addenda to PALD-1-1988. 1a-1989 is the first (margin note a) and 1b-1991 is the second (margin note b). Both must be applied together, with the latest wording taking precedence.
A: Both are Addenda to PALD-1-1988. 1a-1989 is the first (margin note a) and 1b-1991 is the second (margin note b). Both must be applied together, with the latest wording taking precedence.
🔍 Q: Why does the “functional damage” definition matter?
A: It links permanent structural deformation to loss of function, giving design qualification testing an objective acceptance criterion. Any deformation that causes loss of sealing, loss of load, or exceeds the qualification limits means failure — no room for subjective judgment.
A: It links permanent structural deformation to loss of function, giving design qualification testing an objective acceptance criterion. Any deformation that causes loss of sealing, loss of load, or exceeds the qualification limits means failure — no room for subjective judgment.
❓ Q: Must a repaired jack be re-qualified?
A: The standard requires a repaired jack to regain its safety performance. Major repairs affecting the load-bearing structure or the hydraulic system should be evaluated by the manufacturer or an authorized party for re-verification; routine seal replacement needs only a functional check per the manufacturer’s instructions.
A: The standard requires a repaired jack to regain its safety performance. Major repairs affecting the load-bearing structure or the hydraulic system should be evaluated by the manufacturer or an authorized party for re-verification; routine seal replacement needs only a functional check per the manufacturer’s instructions.
❓ Q: Why is “portable” a key scope qualifier?
A: The PALD series addresses portable lifting equipment used in automotive service, whose design, testing, and use conditions assume manual handling and temporary setup. Fixed or industrial lifting equipment falls under other standards, such as the B30 series.
A: The PALD series addresses portable lifting equipment used in automotive service, whose design, testing, and use conditions assume manual handling and temporary setup. Fixed or industrial lifting equipment falls under other standards, such as the B30 series.
