ENADE Engenharia Mecânica Practice Questions - ENADE Engenharia Mecânica - Exame Nacional De Desempenho Dos Estudantes Exam

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A cylindrical compressed air receiver tank has an internal volume of $V = 4.0\text{ m}^3$ and operates at a maximum allowable working pressure of $P = 1.25\text{ MPa}$ ($12.5\text{ bar}$). Under Brazilian Regulatory Standard NR-13, what is its potential hazard category, knowing that air is classified as Fluid Group C (combustible/toxic fluids are Group A/B, inert/air are Group C/D)?

Category V, because compressed air is non-toxic and non-flammable regardless of the $P \cdot V$ product. Category I, because the operating pressure exceeds $1.0\text{ MPa}$. Category III, because the $P \cdot V$ product equals $5.0\text{ MPa}\cdot\text{m}^3$ (which is $\ge 2.5$ and $< 30$) and the fluid belongs to Group C. Category II, because any pressure vessel with volume greater than $1.0\text{ m}^3$ is automatically classified in Category II.

Correct Answer:

Category III, because the $P \cdot V$ product equals $5.0\text{ MPa}\cdot\text{m}^3$ (which is $\ge 2.5$ and $< 30$) and the fluid belongs to Group C.

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