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Ksivusya [100]
3 years ago
6

1. Using a typical frequency value for the initiating event and PFD values provided in class lectures, estimate the mishap or co

nsequence frequency for a cooling water failure if the system to be cooled is provided with the following IPLs: (1) Personnel action with a 10 min response time, and (2) A basic process control system (BPCS).
Engineering
1 answer:
algol133 years ago
5 0

Answer:

a basic process control system is necessary as long as the work by the personnel in charge is efficient, this reduces by 90% the errors or failures to calculate the system to operate

Explanation:

Production staff human error

 Another reason why a breakdown can occur is due to an error of the production personnel. This error, in turn, can originate from:

Error of interpretation of an indicator during the normal operation of the equipment, which causes the operator or driver of the installation to make the wrong decision

Incorrect performance in the event of a machine failure. For example, introducing water into a hot boiler in which water has been lost visually; as it is not known how much water is inside, it may be empty and hot, so when water is introduced it will produce instant vaporization, with the consequent increase in pressure that can even cause the boiler to explode.

Physical factors of the operator: this may not be in perfect condition to carry out his work, due to dizziness, sleep, fatigue accumulated by long working hours, illness, etc.

Psychological factors, such as demotivation, problems external to work, etc., greatly influence the proliferation of operational errors

Lack of clear systematic instructions, such as procedures, technical instructions, etc., or poor implementation of these  Lack of training

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What is the thermal efficiency of this regeneration cycle in terms of enthalpies and fractions of total flow?
irga5000 [103]

Answer:

\eta =\dfrac{(h_3-h_4)-(h_2-h_1)}{(h_3-h_5)}

Explanation:

generally regeneration of cycle is used in the case of gas turbine. due to regeneration efficiency of turbine is increased but there is no effect on the on the net work out put of turbine.Actually in regeneration net heta input is decreases that is why total efficiency  increase.

 Now from T-S diagram

    W_{net}=W_{out}-W_{in}

   W_{net}=(h_3-h_4)-(h_2-h_1)

  Q_{in}=h_3-h_5

  Due to generation (h_5-h_2) amount of energy has been saved.

  Q_{generation}=Q_{saved}

So efficiency of cycle \eta =\frac{W_{net}}{Q_{in}}

  \eta =\dfrac{(h_3-h_4)-(h_2-h_1)}{(h_3-h_5)}

Effectiveness of re-generator

  \varepsilon =\dfrac{(h_5-h_2)}{(h_4-h_2)}

So the efficiency of regenerative cycle

\eta =\dfrac{(h_3-h_4)-(h_2-h_1)}{(h_3-h_5)}

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Calculate the theoretical density of FCC iron (eg. austenitic stainless steel). The lattice parameter for FCC iron is 0.357 nm a
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Answer: 12.4 feet

Explanation:

If there is a smooth transition and there is no change in slopes, energy considerations can be used

The cube has a kinetic energy of

ke = mv^2/2 = 10 lbm * 20^2ft^2/s^2 / 2 = 2000 lbm-ft^2 / s^2

At the highest point when there is a gain in potential energy

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