-3-
■
EPDT-042b
■
5.Pressure loss
To use the strainer most effectively and to fulfill the required criteria thoroughly,
please take the following points into consideration.
5.1 Selection of strainer diameter
The same one as the piping size is selected(piping size
＝
strainer size) if a small size is
used,pressure drop glows and pressure prescribed at the entrance of the equipment
might not be able to be maintained.
5.2 Selection of pipe diameter
When selecting the nominal diameter of pipe, it is necessary to consider the kind of
fluid, its maximum flow rate, allowable pressure loss and piping installation cost among
others. Smaller diameter of pipe makes the lower piping cost, but the pressure loss will
be increased and there are possibilities of abrasion of pipe, noise and vibration due to
turbulent flow. If the pipe diameter is too large, not only the piping cost but also the
heat loss will be increased.
As one method of selection of suitable pipe diameter, Japan Industrial Standard (JIS)
sets the standard flow velocity depends on the relative kind of fluid, its characteristic
and pipe diameter, to which please refer.
≪
Standard flow velocity of fluid
≫
Fluid
Standard flow velocity
Water ,Oil
2 m/s(2
～
4)
Steam
30 m/s(20
～
40)
※
This list shows the standard flow velocity of relative fluid, which made in
reference with the standard of JIS F7101(Ship
’
s Machinery Standard Flow
Velocity in Pipes).
