Brad -
I'd eat a case of aspirin to do that!
I like Mark's idea too. I'm going to look inside the pipe, via a coupon
or just
to cut it. I don't think there'll be a problem on the vertical stuff,
more than likely on
the horizontal.
If it looks bad anywhere, I'll set up a flow test, discharging a known
amount of water
through a known distance of the old pipe. I'll enter that info into
'The' (hydraulic program)
and mess with the C value until the results are duplicated.
The engineer increased the pressure rating of the pump so I could
probably push the
requirement through a swizzle stick anyway.
Thanks, Mark & Brad!
On 3/21/2018 3:02 PM, [email protected] wrote:
The lab would not even need a biologist on staff Vince!
They couldn't tell you what the C Factor was, but if they could
measure the absolute roughness you could take it from there.
I like Mark's idea of a mechanical tee coupon - send them that and
they can measure the height/depth of the inside wall 'irregularities'.
Say that comes up .0059 inches- that means moderately coroded-
Absolute Roughness- that's all they could tell you.
Since the same height on 2" affects the flow of the same height on 6"
far more, you have to calculate the Relative Roughness.
Then, if I was you, I would use the Swamee Jain equation for solving
for the friction factor, look at NFPA 750 and rearange the formula
that solves the friction factor based on C and solve for C based on
the friction factor instead.
Brad
Quoting "Mark.Phelps" <[email protected]>:
My experience with old wet standpipes is that they are almost always
in very good shape internally. A quick proof is to drill a hole for a
2" mech tee and check the coupon for wall thickness and interior
condition.
Mark at Aero
602 820-7894
Sent from my iPhone
On Mar 21, 2018, at 3:21 AM, Vince Sabolik <[email protected]> wrote:
Forum -
I was wondering if anyone has had occasion to have a lab test
piping to establish a C value.
I know that we could back into this value through a point to point
flow test, but would
rather have it tested for.
If you have had experience with a lab, can you forward their name
and requirements?
I working in an old building (80 yrs ±) and want to reuse the old
wet standpipes.
thanks, Vince
11351 Pearl Road / Suite 101
Strongsville, Ohio 44136
Phone 440 238-4800 Fax 440 238-4876Cell 440 724-7601
/
Vince Sabolik /
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*West Tech Fire Protection, Inc.***
11351 Pearl Road / Strongsville, Ohio 44136
Phone 440 238-4800 Fax 440 238-4876 Cell 440 724-7601
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