Page 25 - Catalog4400.pdf

SEO Version

Pressure
When considering hose pressure,
it’s important to know both the
system working pressure and any
surge pressures and spikes.
Hose selection must be made
so that the published maximum
working pressure of the hose is
equal to or greater than the
maximum system pressure.
Surge pressures or peak transient
pressures in the system must be
below the published maximum
working pressure for the hose.
Each Parker hose has a pressure
rating which can be found on the
Hose Overview Chart on page
A-6,
to
A-7
and in
Section E.
All Parker hydraulic hoses have
passed the industry rated specifca-
tions for burst pressure and carry a
4:1 design factor unless otherwise
noted. Burst pressure ratings for
hose are for manufacturing test
purposes only. They are not an
indication that the product can
be used above the published
maximum working pressure.
It is for this reason that the burst
pressure ratings have been
removed from the hose charts
within the catalog.
Care must also be taken when
looking at the “weakest link” of the
hose assembly. A hose assembly
is rated at the maximum working
pressure of the hose and the ftting
component. Therefore the maxi-
mum working pressure of the hose
assembly is the lesser of the rated
working pressure of the hose and
the end connections used.
Here is an example:
An
F471TC0101040404-60”
hose assembly (which consists
of 471TC-4 hose and two
10143-4-4 fttings) would have
a maximum working pressure
of the lesser of the three
components. In this case the
fttings have a 12,000 psi rating.
The hose has a 5,800 psi rating.
Therefore the maximum pressure
rating of the hose assembly would
be 5,800 psi. Pressure ratings for
each Parker end connection can
be found on the
Pressure Rating
of Hose End Connections
–
PSI Chart
in
Section E.
Hose Overview page
A-6
to
A-7.
Pressure Rating of Hose End
Connections page E-43.
Pressure spikes can occur during
machine operation in an instant.
They can occur so quickly in fact,
that standard glycerin filled
gages will never detect them.
Using a pressure diagnostic
system like Parker’s Senso
Control can help detect how
often and how drastic these
pressure spikes are. Contact
your Parker representative today.
To mix and match components is to
increase the risk of hose failure – a
dangerous situation regardless of
setting or application.
25