Safety and occupational healthSH-008

Suspended scaffold failure inside a clinker silo

Ash Grove Cement Company · Durkee Cement Plant, Oregon, USA · 1999

Use this record when

The decision this case can inform

Use this record when inspecting suspended access equipment in an abrasive silo environment or deciding whether fall protection is independent of the work platform.

Evidence scope

Final MSHA fatal-accident investigation of one scaffold failure. The degradation evidence is case-specific; current acceptance criteria require manufacturer and engineering authority.

Source-supported facts

What the public record actually establishes

4 sourced points
  1. F1

    A contractor worked from an aging suspended scaffold inside a clinker silo.

  2. F2

    MSHA documented extensive corrosion, abrasion, fractures, and defects that had not been corrected.

  3. F3

    A weakened support failed and the worker fell approximately 100 feet.

  4. F4

    The absence of independent fall protection converted the platform failure into a fatal fall.

Structured interpretation

Facts and reported results are kept separate from the lesson a plant may choose to test.

01

Operating context

A contractor used an aging suspended scaffold inside a clinker silo.

02

Intervention or finding

MSHA found extensive corrosion, abrasion, fractures, and uncorrected defects; lack of fall protection compounded the failure.

03

Documented result

A weakened scaffold support failed and a worker fell about 100 ft.

04

Plant interpretation

Inspection must detect the actual degradation mechanism and trigger removal from service; equipment integrity and independent fall protection are separate barriers.

05

Transfer boundary

Inspection intervals and acceptance criteria require current manufacturer and engineering input.

Before applying the lesson

Questions to verify at your plant

These are decision checks, not operating instructions. Resolve them through local risk assessment, technical review, and authorization.

  1. 01

    Does inspection target the actual degradation mechanisms created by clinker dust, abrasion, corrosion, storage, and repeated assembly?

  2. 02

    What objective rejection criteria remove a component from service, and who can override that decision?

  3. 03

    Is personal fall protection anchored independently from the suspended platform and its support system?

  4. 04

    Are age, repair history, traceability, and compatibility known for every load-bearing component?