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ASME PALD 1a-1989 — Hydraulic Hand Jacks Safety Standard Addenda (a)
🔧 ASME/ANSI PALD-1a-1989 is the first Addenda issued to the ASME/ANSI PALD-1-1988 volume, Hydraulic Hand Jacks, under the Safety Standard for Portable Automotive Lifting Devices. It was approved by the American National Standards Institute (ANSI) on December 18, 1989, and formally issued on March 31, 1990. The PALD series is a family of safety standards covering portable lifting equipment used during automotive service, maintenance, and storage, divided into 17 separate volumes; PALD-1 covers hydraulic hand jacks.
💡 Addenda are published as replacement pages: revisions, additions, and deletions are incorporated directly into the affected pages. Users should retain the Addenda title page, the copyright page, and every replaced page so that the change history remains traceable.
1. Scope and General Framework 📌
The base Standard PALD-1 applies to self-contained hydraulic hand jacks designed for lifting, but not sustaining, loads in either the vertical (primary) or horizontal (secondary) direction. It is limited to jacks of 30 ton (27,000 kg) rated capacity or less, and does not include hydraulic bumper jacks and their assorted attachments.
- Classifications covered: hydraulic, self-contained jacks with or without internal load limiting devices.
- Not covered: similar lifting devices designed for other commercial or industrial use, such as those within the scope of ASME/ANSI B30.1, Jacks.
- Life-cycle coverage: design, construction, marking, operation, maintenance, and inspection, including personnel qualification.
⚠️ Note the key safety boundary: a hydraulic hand jack is for lifting, not for sustaining. Once the vehicle is raised, it must immediately be supported by rigid stands. Relying on the hydraulic system to hold the load invites a sudden drop if seals leak.
2. Summary of Changes in This Addenda 🔬
This Addenda revises several paragraphs of the 1988 edition. Every change is identified on the affected pages by the margin note (a). Users applying the 1988 edition must incorporate these changes to remain compliant:
| Page | Location | Change |
|---|---|---|
| 1 | Introduction — second paragraph of General | Revised |
| 2 | Section I (Scope) | Revised |
| 5 | Section 2 — definition of “proof load” | Revised |
| 6 | Para. 4.2 | Revised |
| 6 | Para. 4.3 | (1) Deleted; former para. 4.4 redesignated as 4.3; (2) the example of a warning in the newly designated 4.3 revised |
| 7 | Section 6 (Instructions and Warnings) | (1) Subparagraph (a) revised; (2) penultimate paragraph added |
| — | Para. 7.1.5 | Added |
The revised definition of “proof load” directly affects how design qualification tests are judged; the Section 6 changes refine how product instructions and warning labels must be worded; and the new para. 7.1.5 adds requirements for the operation, maintenance, and inspection cycle, reflecting the Committee’s continued emphasis on safe usage.
3. Technical Requirements and Safety Essentials 🔩
Safety requirements for hydraulic hand jacks center on reliable lifting, overload prevention, and drop prevention:
- Design: the load-bearing structure must be adequate for the rated capacity; the hydraulic system must be leak-tight so the load does not creep downward over time.
- Overload protection: jacks fitted with internal load limiting devices must relieve or stop when the rated capacity is exceeded.
- Proof-load testing: under the revised proof-load definition, the jack must withstand the specified proof load during design qualification testing without functional damage.
- Marking: rated capacity, manufacturer identity, and other identification must be clearly marked to prevent misuse and overload.
- Instructions and warnings: operating instructions and warning labels must state correct usage, acceptable surfaces (hard and level), load centering, and prohibited practices.
🚨 Operating safety bottom line: never exceed the rated capacity; never use the jack on soft, sloping, or uneven ground; center the load on the saddle; and keep every part of the body clear of the load zone beneath the vehicle while it is raised.
4. Engineering Practice Essentials 🛠️
- 📋 Documentation control: purchasing and inspection documents referencing ANSI/ASME PALD-1-1988 should state “including Addenda PALD-1a-1989” and keep replacement-page records.
- 🔍 Procurement verification: verify the nameplate rated capacity and manufacturer identification, and request design qualification test records (including the proof-load test).
- 🔧 Periodic inspection: check hydraulic oil level, cylinder seals, saddle wear, and release-valve condition; take the unit out of service immediately on leaks, creeping, or loss of holding pressure.
- 👷 Personnel training: operators must be trained and qualified, understand the “lift, do not sustain” boundary, and always place stands under the load after raising.
5. Frequently Asked Questions ❓
❓ Q: What is an Addenda, and how does it differ from a new edition?
A: An Addenda is an amendment published between formal editions; it modifies the base text through replacement pages. The base edition pages plus the Addenda replacement pages together constitute the current effective text, while a later formal edition consolidates all Addenda into new page text.
A: An Addenda is an amendment published between formal editions; it modifies the base text through replacement pages. The base edition pages plus the Addenda replacement pages together constitute the current effective text, while a later formal edition consolidates all Addenda into new page text.
🔍 Q: What does the margin note (a) on the pages mean?
A: (a) marks changes introduced by this Addenda, the first one for PALD-1-1988. Subsequent Addenda use (b), (c), and so on, so users can tell at a glance which Addenda each change came from.
A: (a) marks changes introduced by this Addenda, the first one for PALD-1-1988. Subsequent Addenda use (b), (c), and so on, so users can tell at a glance which Addenda each change came from.
❓ Q: Does the 30-ton limit mean larger hydraulic hand jacks are unregulated?
A: PALD-1 covers only jacks of 30 ton (27,000 kg) rated capacity or less. Larger units, or jacks for other industrial duty, may fall under ASME/ANSI B30.1, Jacks, or other standards and must be checked against the applicable document.
A: PALD-1 covers only jacks of 30 ton (27,000 kg) rated capacity or less. Larger units, or jacks for other industrial duty, may fall under ASME/ANSI B30.1, Jacks, or other standards and must be checked against the applicable document.
❓ Q: Why does the Standard insist on “lifting but not sustaining”?
A: A hydraulic jack holds its load by fluid pressure; if a seal fails or oil leaks, the load falls slowly or suddenly. The Standard therefore limits the jack to lifting, and requires rigid, mechanically locked stands for supporting — a fundamental life-safety rule.
A: A hydraulic jack holds its load by fluid pressure; if a seal fails or oil leaks, the load falls slowly or suddenly. The Standard therefore limits the jack to lifting, and requires rigid, mechanically locked stands for supporting — a fundamental life-safety rule.
🔍 Q: How should the Addenda replacement pages be managed in a controlled document system?
A: Keep the Addenda cover page, the title and copyright pages, and every replaced page together with the base edition. Label the file “current text: ASME/ANSI PALD-1-1988 including Addenda PALD-1a-1989,” and archive superseded pages so that each change can be traced back to its source.
A: Keep the Addenda cover page, the title and copyright pages, and every replaced page together with the base edition. Label the file “current text: ASME/ANSI PALD-1-1988 including Addenda PALD-1a-1989,” and archive superseded pages so that each change can be traced back to its source.
