Emerson MR98LD Manual

8
MR98 Series AD2000 Compliant
D-A-CH Region Only
Overpressure Protection
▲
WARNING
Overpressuring any portion of
this equipment may result in
equipment damage, leaks in the
relief valve/backpressure regulator
or personal injury due to bursting of
pressure-containing parts.
Relief or backpressure ranges are from 2 to 375 psig /
0.14 to 25.9 bar. The individual spring range of your
valve is stamped on the nameplate.
Maximum inlet pressure depends upon body
materials and temperatures. See Specications
section or the maximum inlet pressure of the valve.
The valve should be inspected for damage after any
overpressure condition.
Vents and Relief Valve Outlet
▲
WARNING
If using an MR98 Series Backpressure
Regulator or Relief Valve on hazardous
or ammable gas service, personal
injury and property damage could occur
due to re or explosion of vented gas
that may have accumulated.
To prevent such injury or damage,
provide piping or tubing to vent the
gas to a safe, well-ventilated area. All
vents should be kept open to permit free
ow 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.
If remote venting is necessary, a tapped vent in the
spring case is available. Install remote vent lines in the
spring case and outlet openings. The vent lines must
have the largest practical diameter and be as short as
possible with a minimum number of bends or elbows.
Install the vent line according to applicable federal, state
and local codes and regulations.
Startup
Note
The Specications section and
Table 3 show the maximum inlet and
di󰀨erential pressures for specic
constructions. Use pressure gauges
to monitor inlet pressure, outlet
pressure and any loading pressure
during startup.
Key numbers are shown in Figures 3 through 5.
1. Check that proper installation is completed and
downstream equipment has been properly adjusted.
2. Make sure all block and vent valves are closed.
3. Decompress the control spring by turning
the adjusting screw (for Types MR98H and
MR98HH) counterclockwise.
4. Slowly open the valves in the following order:
a. Loading supply and control line valve(s), if used
b. Inlet block valve
c. Outlet block valve
5. Set the regulator to the desired set pressure
according to the Adjustment procedure.
Adjustment
Each unit is factory set for the pressure setting
specied on the order or at the mid-point of the spring
range. The allowable spring range is stamped on the
nameplate. If a pressure setting beyond the indicated
range is required, replace with the appropriate spring.
Be sure to label the regulator/valve to indicate the new
pressure range.
Before installing the regulator:
• Unpack the backpressure regulator or relief valve
and remove the protective shipping plugs from
the end connections of the body and the pressure
connection in the spring case.
• Check the backpressure regulator or relief valve
and make sure it has not been damaged or
collected foreign material during shipping.
• Remove any debris or dirt in the tubing and
the pipeline.
• Apply pipe compound to the external pipe thread
for NPT bodies or use appropriate gaskets for
anged bodies.
• Make sure gas ow through the backpressure
regulator or relief valve is in the same direction as
the arrow on the body.

Emerson MR98LD Specifications

General

Brand	Emerson
Model	MR98LD
Category	Control Unit
Language	English