The safety valve hand lifting gear should...

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Question 1 of 205eccefa0bacbc34ba4d46d50

The safety valve hand lifting gear should not be used if the boiler pressure is less than 75% of the safety valve popping pressure in order to __________. provide sufficient steam flow across the valve to prevent the collection of scale on the seat prevent cracking of the seat due to chattering of the feather and disc

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🔍 Key Concepts

• Boiler safety valve operation and purpose of hand lifting gear • Effect of insufficient boiler pressure on valve opening and steam flow • Causes of seat damage, including chattering, feather and disc movement, and scale buildup

💭 Think About

• Think about what happens to steam flow through the valve when the boiler pressure is well below the popping pressure—will the flow be smooth and steady, or weak and unsteady? • How can a partially or unsteadily opened safety valve affect the valve seat over time—could this encourage chattering, scale deposits, or both? • Are the two statements describing completely different problems, or two effects that might occur from the same underlying condition (low pressure lifting)?

✅ Before You Answer

• Verify whether adequate differential pressure is needed to open the safety valve cleanly and keep it from fluttering/chattering. • Consider if scale on the seat is more likely to form when the valve opens fully with strong flow, or when it just cracks open with weak flow. • Ask whether chattering and seat cracking are realistically linked to low-pressure manual lifting, and if exam questions often group related effects together.

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