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  1. pipesnpumps

    Brewery Ventilation!

    This conversation focuses on CO2, but there are so many more variables.. There is steam, there is the amount of combustion air drawn into the room if it is a direct fired boil kettle. There are chemical fumes from cleaning (caustic, phosphoric acid, possibly iodine). Treat it like you would...
  2. pipesnpumps

    Fire Water Tank

    A warehouse containing unexpanded plastic pellets is most likely going to require a large amount of water storage.. 150-250,000 US gallons. What you will find is the potable water usage will likely not be enough to keep the water in the tank potable. There will not be enough potable water...
  3. pipesnpumps

    Model breaded metal hoses in Caesar II

    Man, I dough not know what you guys are talking about, but not sure I knead too anyway. Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
  4. pipesnpumps

    Corrosion resistant piping or protection

    If it is hydrogen sulfide I'd look into using 316SS, although you could likely epoxy coat carbon steel piping and use bagged or wax heads. Unless you have welders experienced with stainless and the tools to do it, that is probably a significant risk. Shielded TIG is a whole different animal...
  5. pipesnpumps

    unlevel flooring for a means of egress

    Just as a point of reference, there are three distinct parts that form the means of egress. You can of course look up the official definitions, but this is my layman's version of them: 1. Exit access - all spaces between you and the rated stairwell or exterior door aka the "exit". Spaces that...
  6. pipesnpumps

    unlevel flooring for a means of egress

    NFPA 101 has it, but most likely the applicable code would be International Building Code. Both have such requirements. In the sections regarding means of egress. Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic...
  7. pipesnpumps

    Smoke detectors in beam pockets

    Some of that is new to the 2010 version of 72.. be sure you use the right version of 72, or be sure you check with the AHJ and see if they will allow those portions of 2010 as providing equivalency to the applicable version (if it is an earlier version). These changes were based on recent...
  8. pipesnpumps

    Small closets in office buildings

    Yes I agree that some shelving incidental to a LH is allowed to be protected by LH... The rub is when does it become misc storage? the line is NOT clear, but if the storage room is of any significant size I submit that meets the definition of misc storage, read below: NFPA 13 - 2010...
  9. pipesnpumps

    Small closets in office buildings

    Odelgado, I recommend reading all of the NFPA 13 section on calculations, and get the handbook version of 13 if possible. If you can, purchase this book: " 'Layout, Detail and Calculation of Fire Sprinkler Systems' (2nd Edition) - This newly revised hardcover textbook has been updated to...
  10. pipesnpumps

    Residential heads in lobbies

    I'd say no, you cannot use them if the building has an NFPA 13 system. Seems crystal clear to me. The center area is not a corridor adjoining (with direct openings to) a dwelling unit. The standard reads such that it does not intend for residential heads to be used outside of the dwelling...
  11. pipesnpumps

    Unlimited area sprinkler system sizes for Factory Mutual

    Ah, makes sense. Perhaps automatic air vents would fix the problem of the flowswitch delay. Be careful with 10" pipe on bar joists. 10" is heavy enough that its load may have to be spread across two joists with a structural member, depending on the spacing of the hangers (which is obviously...
  12. pipesnpumps

    NFPA13

    There is no limit in the standard, however the laws of physics, as you might expect, do in fact still apply.. The amount of water that actually reaches the seat of the fire from a tall height depends on numerous factors like the size of the falling water droplet, and the characteristics of the...
  13. pipesnpumps

    FM200 Ventilation

    Yes. Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
  14. pipesnpumps

    Pump test

    Re read the thread. Seriously sounds like the valve, air bubbles won't sink down to pump suction. I have heard the exact noise you describe across a BF valve. It sounds like a banshee scream or like rocks are being sandblasted inside the pipe. In my case I added another butterfly valve...
  15. pipesnpumps

    Pump test

    Bernoullis principle. As velocity increases in the localized very low pressure zone in the eddy currents on the downstream side of the butterfly valve it flashes into water vapor and immediately collapses back to water downstream. You can't throttle 115 psi across a butterfly valve! Need a...
  16. pipesnpumps

    How to find the minimum thickness of duct with vacuum pressure?

    If you can't read ASME requirements and apply them properly, get someone to help you design it. This is a very basic subject and you need only read the code to find the answer. Question 5.) The design for internal pressure is ONLY when there IS an INTERNAL pressure.. If you used -14.69 psig...
  17. pipesnpumps

    water freezing in absorption chiller

    Li-Br lithium bromide, water spray or ammonia type? I would contact the chiller manufacturer You can't vary the slow through absorption chillers very fast they are finicky. Are you pumping at constant volume? These are complex systems, ask the manufacturer. Real world knowledge doesn't...
  18. pipesnpumps

    Vertical Deflection of Steel Pipe

    I used to use 1/2" at center span. It depends on the slope of the steam line and how much of the sustained allowable stress you want to use.. You don't want to trap condensate and slug it, of course. Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in...
  19. pipesnpumps

    How to find the minimum thickness of duct with vacuum pressure?

    ASME piping codes defer to ASME BPV code for calculating external pressures, at least the last time I checked about 5 years ago they did. I recall using sched 40 piping with up to something like 450 psig external and it was fine. When using smaller wall thickness or higher pressures/temps you...
  20. pipesnpumps

    Pipe Reducer Head Loss Equation

    maybe Crane 410 manual Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.

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