The maximum allowable working pressure on a...

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Question 1 of 205eccefa0bacbc34ba4d46d6c

The maximum allowable working pressure on a packaged auxiliary boiler is 200 psig. The normal working pressure for one particular packaged boiler is 175 psig. Which of the following safety relief valve settings would be proper for this boiler?

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🔍 Key Concepts

• Maximum Allowable Working Pressure (MAWP) vs normal operating pressure – which one controls the safety valve setting? • Typical code requirement that a safety relief valve must not be set higher than MAWP and usually some percent above normal operating pressure. • Purpose of a safety valve – to prevent exceeding the design pressure of the boiler.

💭 Think About

• Start from the MAWP of 200 psig: which options are clearly above that value and therefore cannot be acceptable by code? • Look at the normal working pressure of 175 psig: should the safety valve lift below, at, or above this pressure for safe and stable operation? • Think about what would happen in operation if the valve were set too low vs too high: which settings would cause nuisance lifting, and which might be unsafe?

✅ Before You Answer

• Eliminate any setting that is greater than the MAWP (200 psig). • Compare each remaining option to normal working pressure (175 psig) and ask whether pressure could safely rise a little above normal before the valve lifts. • Remember that the valve should protect the boiler from ever exceeding its design pressure, while not lifting so early that it interferes with normal operation.

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