If a lube oil pump fails to build up...

Question 1 / 270705eccefa1bacbc34ba4d4725b

Question 1 of 270705eccefa1bacbc34ba4d4725b

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the __________.

Question 1 of 27070

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the __________.

🔍 Key Concepts

• Centrifugal and gear pump operation – how suction and discharge sides work • Effect of open vs. closed valves on a pump’s ability to build pressure • Typical causes of loss of prime / no discharge pressure when starting a pump

💭 Think About

• Which condition would prevent the pump from developing a pressure difference between suction and discharge? • Think about what must be true for a pump to ‘build up’ pressure when it first starts—what needs to happen on the suction side and on the discharge side? • For each choice, imagine the pump starting: would that situation more likely cause too much pressure, normal pressure, or no pressure build‑up?

✅ Before You Answer

• Identify which option would most likely cause no pressure rise on a pressure gauge at the discharge when the pump is running • Check whether each condition affects the suction side, the discharge side, or mechanical sealing—and how that relates to pressure buildup • Ask: does this condition cause no flow / no pressure, or does it cause high pressure instead? Eliminate those that would increase pressure

Question 1 of 27070

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the __________.

bypass valve is closed

discharge valve is open

suction pressure is high

shaft packing gland requires adjustment

Question 1 / 270705eccefa1bacbc34ba4d4725b

Question 1 of 270705eccefa1bacbc34ba4d4725b

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the __________.

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Question 1 of 27070

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the __________.