Questions and Answers

Issue 3 and Volume 91.

Questions and Answers NOTE—Readers are invited to send in questions, which will be answered in the order received. Names are omitted from questions unless otherwise specified Pressure on Sprinkler System To the Editor: Will you kindly answer the following questions: I am standing in front of the sprinkler system valve. By looking at the gauges, how can I tell low pressure on a dry system; low pressure on a wet system? Also how can I tell when a head is open on a wet system? L. T. W. Answer: Your question on dry valves does not state whether air or water pressure is wanted. However, we will try and explain both. All dry valves do not operate under the same air conditions, that is: where the water pressure is 50 pounds, the air should not be less than 15 pounds, or more than 25 pounds; 75 pounds water, not less…

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