We are trying to properly size the sump for a vertical turbine pump taking suction from a pond. The sump will have a straight channel approach. NFPA 20 states that the sump should be sized in accordance with the Hydraulics Institute Standards for Centrifugal, Rotary, and Reciprocating Pumps...
My company has been contracted to install a fire sprinkler system in a generating plant with steel grated mezzanines. We would like to be able to use drivable scissor lifts on the grating, but are unsure if the grating is suitable. The customer has informed us the grating has a 150lb/sq.ft...
Years ago I remember using a laser pointer specifically made to fit in a 2x2 ceiling grid that aided in centering the sprinkler heads. It projected a plumb line vertically that one could measure to. I have researched the internet but haven't been able to find one. I am hoping someone here is...
NFPA 2007, Sect. 8.16.3.4 requires all branch lines on gridded systems to be "arranged for flushing". If you flushed each end of the secondary crossmain, wouldn't you be flushing each branch line as well? I have an AHJ that wants to see an individual flushing connection on each branch line in...
I am bidding a job involving several preaction systems, where the specifying engineer has asked us to use the "hot air drying method" to thoroughly remove moisture from the preaction systems after acceptance testing. This is one of many steps they are taking to prevent corrosion. The others...
I often receive dwg files from architects / engineers that have duplicate lines stacked on top of each other. I assume this is from multiple xrefs on top of one another. Is there a command in Autocad that will delete the unnecessary lines? Thanks in advance for any replies.
I am designing a fire sprinkler system in a building that requires all pipe hangers to be located within 6" of a panel point on the top chord of bar joists. I understand that the "A" formed at the top is a panel point, but is the location of the vertical member at the top also considered a...
As a sprinkler guy, I was always told to keep lines 3 feet away from electric panels and never be directly overhead, but I seem to recall reading something lately that specified distances above and away that lines could be. Something like 6 feet or more above is acceptable? Can anyone...
