Emerson FISHER 912N Series Instruction Manual

Instruction Manual
Form 5124
June 2010
912N Series Pressure Regulators
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To avoid injury or equipment damage, these
regulators should be installed, operated, and
maintained in accordance with federal, state
and local codes, rules and regulations, and
Emerson Process Management Regulator
Technologies, inc. instructions.
Only a qualified person must install or service
a regulator. Be certain the control spring
range label is updated to accurately indicate
any field changes in equipment, materials,
service conditions, or pressure settings.
Immediately call a qualified technician in
case of trouble. if venting occurs, or a leak
develops in the system, it indicates that service
is required. Failure to correct the situation
immediately may create a hazardous condition.
introduction
Scope of the Manual
This manual provides installation, maintenance, and parts
information for the 912N Series pressure regulators (Figure 1)
as used in industrial/natural gas applications.
Description
The 912N Series pressure regulators are direct-operated,
spring-loaded devices built to provide accurate, sensitive
control suited to a variety of applications.
As outlet pressure begins to exceed the set pressure, the
diaphragm inside the regulator lifts, operating a lever to
close the inlet. Pressure in excess of the relief valve spring
force opens the relief valve, allowing excess pressure to
bleed through the screened vent in the spring case.
Specifications
Specifications for the 912N Series regulators are given on
page 2.
P1024
installation
Personal injury or equipment damage may
result if the regulator is installed where service
conditions could exceed the pressure or
temperature specifications in Specifications
section. The regulator must not be used for
hazardous gas service in a closed area unless
the vent is piped to a safe area. The vent
opening on the regulator or the opening on
the remote vent pipe (if one is used) should
be pointed down to minimize clogging from
collected moisture, corrosive chemicals, and
other foreign material. Overpressuring the
downstream system (and risk of explosion)
could result from a clogged vent.
Overpressuring any portion of a regulator or
associated equipment may cause leakage,
part damage, or personal injury due to
bursting of pressure-containing parts or
explosion of accumulated gas.
Like most regulators, the 912N Series regulators have an
outlet pressure rating lower than the inlet pressure rating.
Downstream protection is required if the actual inlet pressure
can exceed the regulator outlet pressure rating or the
pressure rating of any downstream equipment.
www.fisherregulators.com
912N Series
Figure 1. Type 912N Regulator
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