Answer :
Final answer:
In a hydrostatic test, the pressure applied to the boiler should not exceed its design pressure. Without knowing the boiler's design, it's hard to give a definitive answer, but it's likely to be around 10-100 psi.
Explanation:
When performing a hydrostatic test, the pressure on the boiler should not exceed the manufacturer's design pressure, which is likely to be considerably less than the extremely high values represented in options 3 and 4. As a rule of thumb, it would not exceed 100 psi (Option 2), and very often it is closer to 10 psi (Option 1) depending on the specific boiler design and application.
In other words, hydrostatic testing involves filling the boiler with water and then applying a pressure to check for any leaks or weak points, but this pressure needs to be managed carefully to avoid damaging the boiler. The pressure usually applied is around 1.5 times the design pressure, however, it can vary according to the specific safety standards per country.
For example, if a boiler has a design pressure of 50 psi, a hydrostatic test might apply pressure of 75 psi. This gives a margin of safety without risking damage to the boiler. So in the context of your question, without specific information about the boiler's design pressure, it's not possible to give a definitive answer. But very certainly it would not be 1,000 psi or 1 million psi!
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