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ASME PALD 12c-1989 — Shop Cranes Safety Standard Addenda (c)
🏗️ ASME/ANSI PALD-12c-1989 is the third and final addenda to the Shop Cranes volume, ASME/ANSI PALD-12-1986. Approved by ANSI on December 14, 1989 and issued on January 31, 1990, it completes the revision cycle of the 1986 edition: with addenda (a), (b), and (c) in place, the 1986-based text reaches its final consolidated state. This addenda focuses on editorial alignment and clause consolidation — revising the definition of proof load, deleting redundant clause 4.3, renumbering former 4.4 as new 4.3, and making editorial corrections to inspection clauses 7.1.3 and 7.1.4.
💡 The issuance of addenda (c) marks the completion of all revisions built on the 1986 edition. For anyone needing the “latest consolidated status,” the 1986 edition plus addenda (a), (b), and (c) is the final authoritative text of that edition series.
1. Principal Changes in This Addenda 📝
Per the Summary of Changes, the modifications in PALD-12c-1989 are distributed as follows:
| Page | Location | Change |
|---|---|---|
| 1 | General | (1) First paragraph editorially revised; (2) second paragraph revised |
| 2 | Section I (Scope) | Revised |
| 2 | Section II (Application) | First paragraph editorially revised |
| 5 | Section 2 — Definitions | Definition of proof load revised |
| 7 | 4.2 Identification | Revised |
| 7 | 4.3 (former) | Deleted |
| 9 | 4.4 | (1) Redesignated as new 4.3; (2) first paragraph editorially revised |
| 9 | 7.1.3 (c), (d) | Editorially revised |
| 9 | 7.1.4 | Editorially revised |
⚠️ This addenda involves a clause deletion and a renumbering (4.3 deleted, former 4.4 becomes new 4.3). Always reference the consolidated text that includes addenda (c), or you may point at deleted content.
2. Shop Crane Technical Requirements 🔧
PALD-12 covers self-contained shop cranes of 8000 lb (3630 kg) capacity or less, characterized by a pair of laterally spaced legs, an upright mast, a pivoting boom, and a hydraulic unit. After three addenda, the consolidated technical requirements can be summarized as:
- Operating Controls: clearly visible and accessible, free of pinch points and sharp edges; the release system must require positive operator action to prevent accidental lowering.
- Travel Limit: a positive means prevents the load from being raised or moved beyond design limits.
- Overload and Proof Load: cranes without internal load limiting devices must lift 150% of rated capacity without functional damage.
- Load Sustaining: no more than 1/8 in. (3 mm) descent in the first minute and 3/16 in. (4.8 mm) in 10 minutes.
- Descent Control: release test descent rate no more than 3 in./sec (75 mm/s).
| Safety Element | Clause | Key Requirement |
|---|---|---|
| Proof load | 3.4 | 150% of rated capacity through full travel, no functional damage |
| Travel limit | 3.2, 5.1.2 | Positive limit preventing extension beyond design limits |
| Instantaneous load loss | 5.1.3 | Leaves ground no more than 12 in. (300 mm) |
| Load sustaining | 5.1.4 | 1 min ≤ 1/8 in. (3 mm); 10 min ≤ 3/16 in. (4.8 mm) |
| Release | 5.1.6 | Descent ≤ 3 in./s (75 mm/s) |
| Secondary load holding | 5.1.5 | Auto stop after pressure release, descent ≤ 7 in. (178 mm) |
🚨 The product marking clauses were reorganized in this addenda (4.3 deleted, former 4.4 renumbered). Rated capacity, manufacturer identification, serial or date code, and warning labels must all be present, durable, and legible — equipment with missing markings must not be represented as conforming to PALD-12.
3. Engineering Practice Essentials 🛠️
- 🔍 Text management: bind the 1986 edition with all three addenda as replacement pages, noting (a), (b), (c) revision layers, so the reference text is the fully consolidated version.
- 🔧 Selection and acceptance: verify rated capacity markings and test records against the latest clauses; require design qualification test evidence from the manufacturer.
- 📊 Inspection and maintenance: per revised 7.1.3 and 7.1.4, periodically check hydraulics, structural welds, hook, and legs, and keep an inspection log.
- 📋 Operator training: operators must be trained on correct use and warning content; never use a shop crane as a vehicle support.
💡 For older shop cranes still in service, compare the consolidated requirements against the current equipment state: complete the markings, set up an inspection regime, and prioritize corrective action for proof-load and load-sustaining safety deficiencies.
Additionally, two points deserve attention in application. First, the Shop Cranes volume is complementary to other PALD volumes (e.g., PALD-1 Hydraulic Hand Jacks, PALD-2 Transmission Jacks, PALD-10 Service Jacks): repair shops should apply the volume matching each job type — shop cranes for engine/transmission removal and transfer, jack volumes for lifting and support duties. Second, Section II (Application) states that operation and maintenance instructions are intended for general applications and that the equipment manufacturer or supplier should be consulted for specific instructions, so users must combine the standard with the manufacturer’s manual to build job-specific operating procedures. For procurement, it is advisable to require in the contract that the manufacturer supply design qualification test reports and a marking information list, then verify rated capacity marking, manufacturer identification, serial or date code, and warning labels item by item on arrival — turning the standard’s requirements into enforceable acceptance clauses.
4. Frequently Asked Questions ❓
❓ Q: Why is PALD-12c-1989 called the “final” addenda?
A: It is the third and last addenda to PALD-12-1986; afterward the Committee turned to the next full edition, so the revision work on the 1986 edition is complete.
A: It is the third and last addenda to PALD-12-1986; afterward the Committee turned to the next full edition, so the revision work on the 1986 edition is complete.
❓ Q: What is the impact of the 4.3 / 4.4 changes?
A: Former 4.3 was deleted and former 4.4 was renumbered as new 4.3. When citing marking clauses, use the new numbering to avoid referencing deleted text.
A: Former 4.3 was deleted and former 4.4 was renumbered as new 4.3. When citing marking clauses, use the new numbering to avoid referencing deleted text.
❓ Q: The proof load definition was revised across all three addenda — what is the final requirement?
A: The final definition states that a proof load exceeds rated capacity and is applied at the lifting points to confirm structural integrity; cranes without internal load limiting devices must pass the 150% proof load test.
A: The final definition states that a proof load exceeds rated capacity and is applied at the lifting points to confirm structural integrity; cranes without internal load limiting devices must pass the 150% proof load test.
🔍 Q: How do I trace between the three addenda?
A: Each addenda marks its changes with margin notes (a), (b), or (c), and each later addenda’s Summary of Changes identifies the earlier revision layers; following that chain reconstructs the full history.
A: Each addenda marks its changes with margin notes (a), (b), or (c), and each later addenda’s Summary of Changes identifies the earlier revision layers; following that chain reconstructs the full history.
