Installation And Overpressure Protection - Emerson CSB400 Series Instruction Manual

CSB400 Series
CSB400 SERIES
REgULaTOR
REgULaTOR VEnT
POInTED DOWnWaRD
Figure 8. CSB400 Series Regulator Installed with the Vent Pointed Downward and with a
Type CSB404 Slam-shut Operation
The Type VSX4 slam-shut module on the
Type CSB404 regulator is a fast acting shut-off
device that provides overpressure (OPSO) or over
and underpressure (OPSO / UPSO) protection
by completely shutting off the flow of gas to the
downstream system. See Table 7 for guidance
regarding the typical setpoints of the regulator and
associated slam-shut OPSO and also the combined
OPSO and UPSO setpoints. The Type VSX4's actions
are independent of the Type CSB404 regulator and
of variations to the inlet pressure. The Type VSX4
comes standard with external downstream pressure
registration, with the option for internal registration only
on the Rp 1 x 2-1/4 GAZ body. External registration
requires a downstream sensing line. See Figure 11
for guidance regarding installation of the downstream
control line.
The Type VSX4 shut-off disk is normally in the open
(reset) position, see Figure 7. If the downstream
pressure below the slam-shut diaphragm increases (or
decreases) until it reaches the slam-shut setpoint, this
diaphragm moves upward (or downward) to release
the trip mechanism which allows the spring force on
the stem to push the disk against the seat, shutting off
all gas flow. To reset the slamshut after gas has been
shut off, refer to the Type VSX4 Instruction Manual for
additional details.
10
PROTECT VEnT PIPE
WITH RaIn CaP
Type 289H Relief Valve for High Capacity Relief
Installation and Overpressure
Protection
Install in accordance with provisions of
EN12186 / EN12279.
nPS 2 TYPE 289H
RELIEF VaLVE
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 and equipment
installation 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 8 through 11. This
minimizes the possibility of freezing
and of water or other foreign materials
entering the vent and interfering with
proper operation.