Installation - Emerson Fisher 67C Instruction Manual

67C Series
Types 67CR, 67CSR, 67CFR, 67CFSR have a low
capacity internal relief valve for minor seat leakage
only. Other overpressure protection must be provided if
the maximum inlet pressure can exceed the maximum
pressure rating of the downstream equipment or exceeds
the maximum outlet pressure rating of the regulator.

Installation

Note
If the regulator is shipped mounted on
another unit, install that unit according
to the appropriate instruction manual.
Personal injury, property damage, equip-
ment damage, or leakage due to escaping
gas or bursting of pressure-containing
parts may result if this regulator is over-
pressured or is installed where service
conditions could exceed the limits given
in the specifications, or where conditions
exceed any ratings of the adjacent piping
or piping connections. To avoid such
injury or damage, provide pressure-
relieving or pressure-limiting devices (as
required by the appropriate code, regula-
tion, or standard) to prevent service
conditions from exceeding those limits.
The internal relief valve of the Type 67CR,
67CSR, 67CFR, or 67CFSR does not
provide full overpressure protection.
The internal relief valve is designed for
minor seat leakage only. If maximum
inlet pressure to the regulator exceeds
maximum pressure ratings of the down-
stream equipment or exceeds maximum
allowable outlet pressure of the regula-
tor, additional overpressure protection is
required.
A regulator may vent some gas to the
atmosphere. In hazardous or flammable
4
gas service, vented gas may accumulate
and cause personal injury, death, or
property damage due to fire or explosion.
Vent a regulator in hazardous gas service
to a remote, safe location away from air
intakes or any hazardous area. The vent
line or stack opening must be protected
against condensation or clogging.
Before installing a Type 67C, 67CR, 67CS, 67CSR,
67CF, 67CFR, 67CFS, or 67CFSR regulator, be sure
the installation complies with the following installation
guidelines:
1. Regulator operation within ratings does not
preclude the possibility of damage from debris in the
lines or from external sources. Regulators should be
inspected for damage periodically and after any
overpressure condition.
2. Only personnel qualified through training and
experience should install, operate, and maintain a
regulator. Make sure that there is no damage to or
foreign material in the regulator. Also ensure that all
tubing and piping is free of debris.
3. Install the regulator so that flow is from the IN to
the OUT connection as marked on the regulator body.
4. For best drainage, orient the drain valve (key 2) to
the lowest possible point on the dripwell (key 5). This
orientation may be improved by rotating the dripwell
with respect to the body (key 1).
5. A clogged spring case vent hole may cause the
regulator to function improperly. To keep this vent hole
from being plugged (and to keep the spring case from
collecting moisture, corrosive chemicals, or other
foreign material) orient the vent to the lowest possible
point on the spring case or otherwise protect it.
Inspect the vent hole regularly to make sure it is not
plugged. Spring case vent hole orientation may be
changed by rotating the spring case with respect to the
body. A 1/4-inch NPT spring case vent may be
remotely vented by installing obstruction-free tubing or
piping into the vent. Protect the remote vent by
installing a screened vent cap on the remote end of
the vent pipe.
6. For use in regulator shutdown, install upstream
block and vent valves and downstream block and vent
valves (if required), or provide some other suitable
means of properly venting the regulator inlet and outlet
pressures. Install a pressure gauge to monitor
instruments on startup.