Exam (elaborations)
OSHE 381 - Final Questions & Detailed Answers
- Course
- OSHE 381
- Institution
- University Of California - Berkeley
OSHE 381 - Final Questions & Detailed Answers
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OSHE 381 - Final Questions & Detailed AnswersCapacitance - ANS The storage of electrical potential
-caused by separating 2 conductors
Streaming Current - ANS Flow of electrons produced by transferring electrons from
one surface to another
Relaxation - ANS Pumping fluids into a tank through a pipe on top of the vessel
-Using a larger pipe just before the fluid enters the tank, the fluid flows slower and
less electrostatic charge builds up
Bonding and Grounding - ANS Voltage difference btw. 2 conductive materials is
reduced to zero by bonding the 2 materials
-Bonding by connecting one end of the conducting wire to one of the materials
and the other end of the second material
Dip Pipes - ANS Free falling liquids accumulate electrostatic charge
-dip pipes are extended legs that are used to eliminate some of the distance the
liquid must fall when filling the tank
-care must be taken to prevent siphoning back when the inlet flow is stopped- a
hole at the top will stop this
, Increasing conductivity with additives - ANS Accomplished by the addition of an
additive which will allow electrostatic charge to drain off
-also called antistatic additives
National Electrical Code (NEC) - ANS Divides hazardous locations into 3 classes and
divides each class into 2 divisions
Class I, Divison I - ANS -hazardous concentrations of flammable gases or vapours
exist continuously
-hazardous concentrations of such gases and vapours may exist frequently b/c of
repair or maintenance or b/c of leakage
-breakdown or faulty operation of equipment or processes which might release
hazardous concentrations of gases and vapours and might also cause failure to
electrical equipment
Class I, Divison II - ANS -volatile flammable liquids or gases are handled or used but
are normally confined in containers from which they can escape from accident
-hazardous concentrations of gases and vapors are normally prevented by positive
mechanical ventilation
-are adjacent to but not cut off from Class I, Divison I locations
Class II, Division I - ANS -combustible dust may be suspended in air
-mechanical failure or abnormal operation might cause such mixtures to be
produced and might also provide a source of ignition
-in which dusts of an electrically conductive nature may be present
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