Questions and Answers

Issue 9 and Volume 88.

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 Vacuum Readings To the Editor: Will you please tell me how to figure the vacuum on a suction hose line. I would like to know how to determine the vacuum in inches, etc., on a pumper. K. W. F. Answer: If the vacuum gage on your suction line shows vacuum in pounds, multiply by 2.0416 to secure the vacuum in inches of mercury. If the vacuum gage registers feet lift, then divide the feet lift by 1.134 to secure the inches vacuum. Incidentally, inches of vacuum are recorded in inches of mercury. Oneinch vacuum means that mercury would be raised by suction one-inch in the tube. Flash Point and Ignition Point To the Editor: In the April edition of FIRE ENGINEERING you have an…

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