# EXPLODING VESSELS UNDER PRESSURE
> MSHA accident `220170530019` · 02/17/2017 · Martin Marietta Materials, Inc.
## Details
- **Degree of injury:** NO DYS AWY FRM WRK,NO RSTR ACT
- **Classification:** EXPLODING VESSELS UNDER PRESSURE
- **Accident type:** Struck by flying object
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Machine maintenance
- **Injury source:** METAL,NEC(PIPE,WIRE,NAIL)
- **Nature of injury:** FRACTURE,CHIP
- **Body part:** NOSE/NASAL PASSAGES/SINUS/SMELL
- **Days lost:** 0
- **Mine experience:** 8 years
## Operator
- **Controller:** Martin Marietta Materials Inc
- **Operator:** Martin Marietta Materials, Inc.
- **Mine:** [4102886](https://api.ai-analytics.org/mine/4102886)
## Narrative

Technician was removing parking brake assembly from excavator final drive.  Tech used a hydraulic press to release parking brake. When tech went to remove snap ring retaining brake piston, piston blew out of housing, piston contacted tech nose and injury resulted in fracture and stitches.

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*