Determining the internal diameter



HOW TO DETERMINE THE INTERNAL DIAMETER (I.D.) OF HOSES.

Chart indicating flow rate and velocity from which to determine nominal size

 
A Maximum recommended
suction line
velocity
B Maximum recommended
return line velocity
C Maximum recommended
delivery line velocity

How to determine
the internal
diameter (I.D.)
of hoses
Delivery (l/min)
Flow velocity (m/sec)
ND (mm)
EXAMPLE:
given a flow rate of P= 60 l/min and a
velocity V= 5 m/sec the nominal size
will be I.D.: DN= 16.
Resistances to flow are not considered.

delivery (l/min) P = 60
flow velocity (m/sec) V = 5
NOMINAL DIAMETER (mm) DN = 16

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