NM CID MS-6 Practice Questions - New Mexico CID MS-6 Lawn Sprinklers Examination Exam

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A lateral carries 25 GPM. Velocity in 1 in. Schedule 40 (ID 1.049 in.) is about 9.3 ft/s. In 1 in. Class 200 (ID 1.189 in.) it is about 7.2 ft/s. What is the correct pipe decision if the design limit is 5 ft/s?

Either 1 in. pipe is acceptable because both are called 1 in. Use 1 in. Class 200 only, because 7.2 ft/s is close enough Upsize; both 1 in. walls exceed 5 ft/s at 25 GPM Downsize to 3/4 in. to raise pressure

Correct Answer:

Upsize; both 1 in. walls exceed 5 ft/s at 25 GPM

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