Hazards fatigue failure

Solid centre shafts are heavy relative to their strength, compared with tubes hence solid shafts tend to be used only on short feed screws. Bolted-in end shafts, a fairly common form of construction for some standard ranges of screw conveyors, are rarely used for feeder screws, as these are less strong than welded-in end shafts and present hazards relating to hygiene, cross-contamination, crevice corrosion, and fatigue failure. 

Spill (solid radioactive materials-toxic constituents) Various hazardous radioactive solids -Forklift puncture -Toppling of container (mishandliug, energetic external event) -Fatigue failure of container -Spill would be limited to area immediately surrounding container. -Procedures and training direct workers to leave area immediately. 

The impact forces on car couplers put high stresses in sills, anchors, and doublers. This may start fatigue cracks in the shell, particularly at the corners of welded doubler plates. With brittle steel in cold weather, such cracks sometimes cause complete rupture of the tank. Large end radii on the doublers and tougher steels will reduce this hazard. Inspection of older cars can reveal cracks before failure. 

Human Toxicity Extremely hazardous. Collapse, coma, and death from respiratory failure may come within a few seconds after one or two inspirations. Insidious poison, since sense of smell may be fatigued and fail to give warning of high concns. Low concns produce irritation of conjunctiva and mucous membranes. Headache, dizziness, nausea, lassitude may appear after exposure. Clinical Toxicology of Commercial Products, R. E. Gosselin et al., Eds. (Williams Wilkins, Baltimore, 4th ed.. 1976) Section 111, pp 169-173. 

Equipment Failures Hazards built into equipment Corrosion or erosion failures Metal fatigue... 

A CSI is essentially the same as an SCI except that systems required to identify CSIs have additional statutory and regulatory requirements that the contractor must meet in supplying those CSIs to the government. For systems required to have a CSI list, HA and mishap risk assessment is used to develop that list. The determining factor in CSIs is the consequence of failure, not the probability that the failure or consequence would occur. CSIs include items determined to be life-limited, fracture critical, fatigue-sensitive, and so on. Unsafe conditions relate to hazard severity categories I and II of MIL-STD-882. A CSI is also identified as a part, subassembly, assembly, subsystem, installation equipment, or support equipment for a system that contains a characteristic, failure mode, malfunction, or absence of which could result in a Class A or Class B accident as defined by DoDINST 6055.7. 

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