K Factors; Terms Of Reference; Calculation Of K Factors (In Pulse/Litre) For Saddles, Fusion Spigots, Welding Sockets With Radius Or Screw-Ons - Burkert S020 Manuel D'utilisation

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 pulse/
litre) for saddles, fusion spigots,
welding sockets with radius or
screw-ons
The calculation does not apply to T fittings or welding
sockets for measuring devices with a clamp connection.
In addition to the terms of reference mentioned above, the K factors
for saddles, fusion spigots, welding sockets with radius and screw-
ons have been determined as a function of the external diameter
(d ) and the wall thickness (s
material
tables.
→
When the dimensions of the pipe are slightly different from
dimensions 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 the
pipe vary by +/-5% compared with the theoretical dimen-
sions given in the tables.
20
) of the pipe given in the
material
English
Type S020
Technicaldata
K = K
n
Fig. 3: Fitting used with a paddle-wheel flowmeter
K = K
n
Fig. 4: Fitting used with an electromagnetic flowmeter
K = recalculated K factor
n
K = K factor given in the table
t
d = D - 2s = theoretical internal diameter of the pipe
t material material
calculated using the values D
s
material
material (D
the pipe and s
pipe)
d = internal diameter of the pipe
n
d
2
t
x
t
d
2
n
d
2
n
x
t
d
2
t
and
material
given in the tables, for each fitting
= external diameter of
material
= thickness of the
material