4
■
EPDT-263b
■
4. Nominal Size Selection
Select a strainer of the same nominal size as that of the pipe (nominal size of piping = nominal size of
strainer). Note that using a strainer of a smaller nominal size increases the pressure loss of the strainer
and may result in the pressure fallen below the specified level at the inlet side of the equipment (see Fig. 1
“Pressure Loss Chart”).
Fig.1 Pressure Loss Chart (For Water)
As a reference, the standard flow velocity is specified in the Japanese Industrial Standards (JIS) as a
guide to select an appropriate nominal pipe size. See the following table.
Standard flow velocity
Fluid
Standard Flow
Velocity
Water, Oil
2 m/s (2-4)
*
The above table is based on the requirements in JIS F 7101:2002 “Shipbuilding - Pipes of machinery -
standard velocity of flow”.
∆
P: Pressure loss MPa
V
:
F
lo
w
r
a
te
L
/m
in
Nominal
size
Screen: Perforation =
φ
8-10P, Mesh = 60 mesh
