Recent content by TedLinsle

thread184-261048 The above thread was closed but the answer was not given in the thread as I think the author and I were both looking for this requirement. The QR requirements are given in the IBC and pertain to specific occupancies, local and state codes notwithstanding.

You should use either/or but not both. Dope & tape will lubricate and seal threads, but not each other.

Any/All: Wouldn't the Hardy-Cross method be appropriate for this problem, or is that only for multiple outlets?

I'm used to vac systems for labs, hospitals, shop air, etc. Guess I can't be much help here.

It is an accepted engineering practice to add 50% to the measured length to calculate the equivalent length. Alternatively one can add up fittings individual equivalent lengths. There's a great chart for this--"Table 11-2.-Representative Equivalent Length in Pipe Diameters (L/D) of Various...

Ashereng, You are correct. The ANSI standard prescribes a minimum 15 minute duration for delivery of flushing fluid. Getting an accurate design flow is obviously important for estimating the hot water requirements for these, as they tend to be quite large. It's also rather pointless to design...

There is no catch-all equation for this. The tables are sequential and inclusive ranges of straight line functions with decreasing slopes. It is known as Hunter's curve and is based on probability of simultaneous fixture use. For sizing a pipe to an individual fixture, the probability is 100%...

ANSI for Emergency Eyewash and Shower Equipment is Z358.1. The minimum flow requirements are: Emergency Shower: 20 GPM Eyewash: 0.4 GPM Facewash: 3 GPM Plumbed units tend to flow more than these minumums at a design residual of 30 PSI, and varies significantly by manufacturer--some have flow...

Maybe it'd be cleaner to remove the drop-to-branch connection and draining from that end? You mention that the modification is significant, so they'll probably have to be removed anyway.

They're called aspirators...at least the ones that connect directly to lab faucets.

Disregard. My suggestion wasn't a solution. I suppose you'd need a flow transducer ahead of the filter such that flow is controlled by an adjustment to a vacuum regulator, however, I'm not going attempt to write your specification.

How about: Particle source -> filter-->Vacuum Breaker-->Valve fully open-> vacuum pump You might want to monitor the vacuum upstream of the filter as an indicator of the particulate resistance at the filter.

Set your system variable HIGHLIGHT to 1. Lock your workstation when you are away from your desk. Pass protect your workstation's system startup.

I'm looking for some design guidance on when bullhead tee configurations are acceptable. I know they typically are to be avoided in hydronic systems, but don't see as much emphasis against them in domestic water & domestic water heating applications. My definition of a bullhead tee...

I'm posting this at a late date in the thread, but my first question about this situation would be "was there any language in the General or Supplemental Conditions stating that the drawings weren't scaleable"? Sometimes the specifications state such a disclaimer noting that critical...