HYDRAULIC
HOSES
TECHNICAL
INFORMATION
DETERMINATION
OF NOMINAL DIAMETER
MONOGRAM
FOR DETERMINATION OF NOMINAL DIAMETER
The monogram cab be used as an aid to
select the nominal diameters of hoses
and pipe assemblies.
EXAMPLE
:
Rate of flow Q=50 I/min (left-hand
scale), chosen speed V=approx.4m/sec.
(right-hand scale). the point of
intersection on the middle scale gives
a nominal diameter of 19.1 mm. Other
parameters of the installation, such
as length of hoses assemblies, number
of valves, viscosity of the oil and
maximum permissible pressure loss,
must be taken into account when
determining final nominal diameters.
The nominal diameter can also be
determined using the formula:
Where Q and V must be inserted as
above. The values of the nomogram are
based on hydraulic oils with a maximum
viscosity of 315 S.S.U. (90
E) at + 380 C(+1000F)
at an operation temperature of between
+ 180 C (+650 F)
and + 680 C (+ 1550
F).
