K Factors; Terms Of Reference; Calculation Of K Factors (In Imp./L) For Saddles, Fusion Spigots, Welding Tabs Or Screw-Ons - bürkert S020 Bedienungsanleitung

6.4.

K factors

6.4.1.

Terms of reference

The K factors have all been determined under the following terms
of reference: fluid = water, water and room temperatures of 20°C,
minimum upstream and downstream distances respected, appro-
priate pipe dimensions.
6.4.2. calculation of K factors (in imp./l)
for saddles, fusion spigots, welding
tabs or screw-ons
This calculation does not apply to T-fittings.
In addition to the terms of reference mentioned above, the K factors
for saddles, fusion spigots, welding tabs and screw-ons have been
determined as a function of the external diameter (d
wall thickness (s ) of the pipe given in the tables.
material
When the dimensions of your pipe are slightly different from dimen-
sions d and s given in the tables, recalculate the K factor using one
of the following formulae:
These formulae can only be applied if the dimensions of
your pipe vary by +/-5% compared with the theoretical
dimensions given in the tables.
18
Fig. 1:
Fig. 2:
K = recalculated K factor
n
K = K factor given in the table
t
d = D
t
) and the
material
d = internal diameter of your pipe
n
English
Type S020
Technicaldetails
K = K x
n t
Fitting used with a paddle-wheel flow sensor
K = K x
n t
Fitting used with an electromagnetic flow sensor
- 2s = theoretical internal diameter of the
material material
pipe calculated using the values D
and s
terial material
each fitting material (D
diameter of the pipe and s
thickness of the pipe)
d
2
t
d
2
n
d
2
n
d
2
t
ma-
given in the tables, for
= external
material
=
material