Data Sheet

www.fisherregulators.com
23
Regulator Tips (continued)
For more Regulator Tips, turn to page 664 of the Industrial Application Guide Edition VI or log-on to www.fisherregulators.com
INSTALLATION
• Diaphragms leak a small amount due to migration of gas
through the diaphragm material. To allow escape of this
gas, be sure casing vents (where provided) remain open.
• Use control lines of equal or greater size than the control
tap on the regulator. If a long control line is required,
make it bigger. A rule of thumb is to use the next
nominal pipe size for every 20 feet / 6.1 meters of control
line. Small control lines cause a delayed response of
the regulator, leading to increased chance of instability.
3/8-inch OD tubing is the minimum recommended
control line size.
• When using relief valves, be sure to remember that the
reseat point is lower than the start-to-bubble point. To
avoid seepage, keep the relief valve setpoint far enough
above the regulator setpoint.
• Vents should be pointed down to help avoid the
accumulation of water condensation or other materials
in the spring case.
• Make control line connections in a straight run of pipe
about 10 pipe diameters downstream of any area of
turbulence, such as elbows, pipe swages, or block valves.
• When installing a working monitor station, get as much
volume between the two regulators as possible. This
will give the upstream regulator more room to control
intermediate pressure.
Emerson's sales, service and technical support are close at hand. Anywhere in the world, Emerson resources are
available by telephone or on our website. Our distribution network includes an experienced sales and support team,
with more than 2,000 technical experts available from nearly 200 offices throughout the world.