Sorry, I just wanted to add one more thing--
Personally, I would be skiddish drawing too many conclusions from calc
placards. As-Builts and Main Drain Tests is what I would want. I would call
BOR the Riser Gauge. That would also be the Test Node, since I would
measure the MD pipe, fittings and valv
Maybe it was 1972 Edition.
It's been a year and a half since I knew for sure.
b
On Jul 8, 2016 2:30 PM, "Timothy W Goins" wrote:
> Main drain testing should only be compared to other main drain testing.
> The usual Venturi effect on the supply/system gauges do not give you an
> accurate pressure
Main drain testing should only be compared to other main drain testing. The
usual Venturi effect on the supply/system gauges do not give you an accurate
pressure reading when reading the residual pressure as the water passes by on
its way to the drain.
"For I am not ashamed of the gospel, becau
Main Drain tags are usually legible though, even on pipe scheduled systems.
What was "Base of Riser" before 1975? (the year the Density/Area Curves made
their first appearance if I'm not mistaken).
Brad
_
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org
I've also seen placards that are total crap, but that's another issue...
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT
860-535-2080 (ofc) 860-608-4559 (cell)
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On Fri, Jul 8, 2016 at 3:09 P
This is a fun discussion to watch (read).
Plays right into the relevancy (or not) of NFPA 25.
Placards are generally not legible when I need to look at them because 1)
someone wants to revise their system, 2) someone wants me to analyze their
system, 3) we are doing risk management at a facilit
A main drain test is for comparison to previous main drain tests only. There
should be one done when the system in put in service. Any deviation from that
means a change in available water but not any hydraulic analysis
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Different test. Full flow test is to ensure the back flow device fully
opens (the question is what is a full test mean and I believe has been
determined to be the system demand rather than how much water push through
the pipes). The main drain test is to verify that the originally recorded
residual
A 2” main drain is not sufficient in all situations. You must be able to a full
forward flow of the backflow including system demand and hose streams (#13 2010
10.10.2.5.2). I have installed a test header with 2½” hose valves at the riser
to do this in the past.
Ryan Labrie
Fire Protection Desi
Good. That is a good rationale for that particular piece of information
being readily available.
I have had that problem before myself, but the anomaly was easily noticed
as the provided and collected data defied physics so I knew something was
wrong before I stated anything.
On Fri, Jul 8, 2016 a
I’ve always looked at it as a red-flag benchmark. The residual demand at BOR
takes static lift and friction loss to the remote area into account, so if I do
a main drain test and I look at the calc’ card and read that the demand is …
whatever, 63.5 PSI @ 331.7 GPM. And then I look at the gau
So I have the total demand at the BOR and the expected pressure loss from
static with the entire design area flowing. How does a main drain test
simulate this? My understanding of the main drain test is a comparative
analysis of pressure drop as recorded at acceptance from the Contractor's
Above Gr
The information of value at least once a year when you do the main drain test.
Maybe you could add both BOR and Source demands, but I don’t agree with
posting Source data in lieu of BOR.
SL
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of Todd William
I'll ask the unthinkable question, is the BoR demand on the placard worthwhile?
Hydraulic calculations are done back to the effective point of the flow test.
The underground losses, hose demand and sometimes backflow preventer losses are
taken before the BoR. Consequently you cannot compare the
In response to the original question, is it just me or are we over-thinking
this?
NFPA 13 says that when using residential heads, you calculate the 4 heads that
produce the greatest hydraulic demand. No mention of units, rated walls,
corridors, type of construction, etc.
I didn't know Geor
I’ve asked this question in the past and the answers have been all over the
board.
I tend to think the BOR location needs to be consistent from project to
project, whether it’s a single system riser or multiple system risers. In our
part of the universe, most (but not all) backflow preven
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