Briefly describe OSHA's latest record-keeping requirements
What will be an ideal response?
OSHA's goals for the new record-keeping and reporting system were as follows:
• Simplify all aspects of the process
• Improve the quality of records
• Meet the needs of a broad base of stakeholders
• Improve access for employees
• Minimize the regulatory burden
• Reduce vagueness—give clear guidance
• Promote the use of data from the new system in local safety and health programs
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Compound X enters a steady state compressor as a gas at P1=0.5 bar and T1=300 K, and leaves the compressor at P2=15 bar and T2=600 K. (These are the actual temperature and pressure of the exiting stream.) Then it enters a steady state heat exchanger in which it is cooled and condensed into a liquid at P3=15 bar and T3=200 K.
X has the following properties: Critical temperature T=250 K Critical pressure P=40 bar Acentric factor ?=0.2 Ideal gas heat capacity CP* = 5R At temperatures equal to or below 250 K, it can be modeled using the Peng-Robinson EOS At pressures below 1 bar, it can be modeled as an ideal gas At the conditions of the compressor outlet (2), it can be modeled using the following EOS: PV = RT + (BP3) Where B = -4 cm3mol-1bar-2 Prove that ((??H)/?P)_T= ?V- T((??V)/?T)_P Find a general algebraic expression for the residual molar enthalpy HR, in terms of P, V , T and/or constants, that results from the equation of state PV = RT + (BP3). Find the change in molar enthalpy for the gas as it goes through the compressor (H2-H1). Determine the Peng-Robinson parameters a and b for this compound at a temperature of 200 K. The three solutions of the Peng-Robinson for V at T=200 K and P=15 bar are V = 60.2, 326.3 and 681.6 cm3/mol. Determine the compressibility factor Z for the liquid leaving the heat exchanger. Suppose you wanted to use the Lee-Kesler method, rather than the Peng-Robinson equation, to model the liquid leaving the heat exchanger (T3, P3). Use the figures in Chapter 7 to estimate the residual molar entropy S3R of this liquid. Y is another compound in the same chemical family as X. Y has a critical temperature of 300 K and a critical pressure of 30 bar. At what temperature and pressure would you expect compound Y to have a compressibility factor (Z) identical to the one you calculated in part E?
The MOST-LIKELY way to be burned in an automotive shop is:
A. by radiators B. by fan motors C. by fan blades D. with hot engine coolant
44 - (-20 ) =
A) 24 B) 64 C) -64 D) -24
The very nature of wood makes it a green product.
Answer the following statement true (T) or false (F)