Installation And Overpressure Protection - Fisher CS403 Instruction Manual

CS400 Series
CS400 SERIES
REGULATOR
REGULATOR VENT
POINTED DOWNWARD
Installation and Overpressure
Protection
WARNING
!
Personal injury or system damage
may result if this regulator is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in the
Specifications section and/or
regulator nameplate.
Regulator installations should
be adequately protected from
physical damage.
All vents should be kept open to permit
free flow of gas to the atmosphere.
Protect openings against entrance of
rain, snow, insects or any other foreign
material that may plug the vent or vent
line. On outdoor installations, point the
spring case vent downward to allow
condensate to drain (see Figures 5
through 7).
8
Figure 5. CS400 Series Regulator Installed with the Vent Pointed Downward and
with a Type 289H Relief Valve for High Capacity Relief
PROTECT VENT PIPE
WITH RAIN CAP
This minimizes the possibility of freezing
and of water or other foreign materials
entering the vent and interfering with
proper operation.
For the Type CS403 with the Integral
Monitor or the Type CS404 with
slam shut, point the vents of both
the Primary Regulator and Integral
Monitor or slam shut downward to allow
condensate to drain. From the factory,
the Integral Monitor or slam shut will
always point in the same direction as
that of the Primary Regulator.
Under enclosed conditions or indoors,
escaping gas may accumulate and be
an explosion hazard. In these cases,
the vent should be piped away from the
regulator to the outdoors.
NPS 2 / DN 50
TYPE 289H
RELIEF VALVE