Rahe,
Isn't the total pressure lost through the fitting, even if the length is
adjusted for
an alternate c-factor, still the same actual PSI as it would be for a C
of 120?
For example, a 1" Tee has an equivalent length of 5'-0", in a system with a
c-factor of 120, flowing 20 gpm, the loss through this fitting, using H-W
formula, is approximately 0.65 psi.
However, if you adjust the fitting length per the table in NFPA-13 for use
in a system with a c-factor of 100, that length changes to 3.565', and when
the H-W equation is applied, using a c-factor of 100, with the same flow
and diameter, the loss is approximately 0.65 psi.
Have I read that wrong?
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
[EMAIL PROTECTED] wrote:
As an aside, when a hydraulic calculation uses a C-factor less than 120,
the friction loss goes up but the equivalent length of fittings goes down.
Also when the temperature goes from the minimum of 40 degrees F to 100
degrees F in a heated attic system, with all other things equal, the
C-factor will change by 7 points.
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