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This is more of a "what if" question. We did oil analysis and everything was fine for the current condition. The problem is I have to deal with what could have happened if the fire pump automatically started for an emergency. How long could I expect it to run without eating itself? How would...

Hi all; We have a standby diesel driven fire pump that goes through a right angle gear drive to a vertical shaft turbine type pump. (6 cyl, 325 HP) The angle gear head is a 6 to 5 ratio with input 2100rpm and output 1760rpm. The oil is about 11 galons of Mobil DTE BB (VG 220). The pump is in an...

Thanks for the formula correction. That makes more sense to me, I have made it a habit to check the units of formulas and this stood out. I found the Entek article using a Google search for "Dynamic Absorbers". I am sorry to say I do not know where the rest of the articles went. stay safe; paul

Thanks for the responses. I did find the Entek article at http://domino.automation.rockwell.com/applications/gs/region/EntekWebST.nsf/files/Fox00.pdf/$file/Fox00.pdf but there appears to be mistakes in the formula (unit analysis shows a discrepency). The rule of thumb was just what I was...

We have a 20,000lb vertical pump/motor with vibes over 0.38 ips in the horizontal direction from running at the natural frequency of the system. We tried adding mass and were successful to a point, but needed more then we thought prudent. We are discussing dynamic absorbers and I was wondering...

Thanks for your prompt an thorough reply. My little manual snowblowers (age 15 & 17) will appreciate being able to get in the shed this winter to utilize the mechanical one. stay safe; paul (fire proection engineer)

Last winter the frost caused the ground to expand in front of my shed door so I couldn't open it. My question is: How can I prepare the ground to prevent this from happening again? Particulars: I live in New Hampshire, USA, near the seacoast. Shed is on blocks with sill approx. 6" above...