172-65604MA-00 (
PN-COSR
Pneumatic Control Valve) 10 Sep 2014
11
8. Piping
Size
If the secondary steam flow velocity is expected to be more than 30 m/s (100 ft/s),
install a diffuser in order to keep the flow velocity below 30 m/s (100 ft/s).
If the distance between the
PN-COSR-16
and the steam-using equipment is great,
a possible drop in pressure should be taken into consideration when selecting the
piping size.
In addition, when installing the strainer, the strainer screen should be either at the
3 o’clock or 9 o’clock position to prevent condensate accumulation.
PN-COSR
Diffuser
Straight-run piping lengths (d = pipe diameter):
Upstream = 10 d or more; Downstream = 15 d ore more
PN-COSR
9. Two-stage Pressure Reduction
Whenever the pressure cannot be reduced to the desired level with a single
PN-
COSR-16
due to operating range limitations, such as when the reduction ratio is
greater than 10:1, the pressure reducing valve should be installed at the primary
side.
PN-COSR
Pressure
Gauge
Pressure
Gauge
Pressure
Gauge
Bypass
Valve
Primary
Side
Shut-off
Valve
Shut-off
Valve
Pressure
Reducing
Valve
Bypass
Valve
Shut-off
Valve
Shut-off
Valve
Safety Valve
(Relief Valve)
PN-COSR
Pressure
Gauge
Pressure
Gauge
Bypass
Valve
Shut-off
Valve
Shut-off
Valve
Safety Valve
(Relief Valve)
Primary
Side
