6
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Dresser
Installation
(cont’d)
WARNING
Gas Regulators installed in confined or enclosed spaces
should be provided with adequate ventilation to prevent
the possibility of gas buildup or accumulation from
leaks and venting. Leaks or vented gas may accumulate
causing personal injury, death, or property damage.
Pilot spring cases and the regulator enclosure should
be vented to a safe area away from air intakes, or any
hazardous location. The vent lines and stacks must be
protected against condensation and clogging.
9. PILOT SUPPLY LINES:
Run a 3/8-inch or 1/2-inch pilot
supply line from the valve body connection on the inlet
side of the shut off valve center port to the pilot supply
Filter or directly to the pilot Restrictor.
NOTE: A shutoff valve is not required in the supply to the
pilot, but if one is installed it should be a full opening ball
valve type.
10. A TYPE 30 FILTER
in the pilot supply line is
recommended to clean dirt and other particulates that
could affect the restrictor or variable orifice in the pilot.
Use a 1/4" nipple to mount the filter to the shut off valve
to the center port.
11. FILTER OUTLET:
Run 3/8 inch tubing or 1/4- inch
pipe from the filter OUTLET port to the INLET side of the
restrictor in the pilot system of the regulator. The TYPE
30/30A/30S FILTER has two OUTLET ports for ease of
tubing. Block the other port with the plug provided or
mount a gage to monitor inlet pressure if desired.
NOTE: To avoid galling when stainless steel to stain-
less steel connections are made use a lubricant (such
as NEVER SEEZ by Bostik1). For best results Lightly
lubricate the female threads. Mixing the lubricant with
pipe dope is also acceptable. Do not exceed more than
1/4 turn past the point the threads start to bind.
12. PILOT GAS HEATERS (OPTIONAL):
Pilot supply gas
can be heated to prevent the formation of ice or hydrates
in the pilot system. Pilot supply gas heaters should be
connected after the pilot filter (if one is used). Do not
directly heat the entire Flowgrid
®
valve to prevent freezing;
internal rubber components can be heated beyond their
max temperature rating causing potential damage.
13. CONTROL LINES:
Control lines should be run from the
pilot mounted on the Flowgrid
®
valve to a point 8 to 10
pipe diameters minimum of straight pipe downstream
from the valve (Refer to Piping Schematics). Use Table 1
as a guide for the ideal tubing to use. Reduce as neces-
sary to connect to the pilot.
Outlet Pressure
Pilot Regulator
with:
Inches W.C. to
2 psi
2 psi to 5 psi
5 psi & Above
Static Sense Line
(No Flow)
1/2” Pipe
Minimum
1/2” Tubing
3/8” Tubing
Sense Line with
Flow*
3/4” to 1” Pipe
1/2” Pipe
1/2’ Tubing
*The Flowgrid
®
Series 20 Pilot has a static sense line.
Table 1
NOTE: The control line connection should be away
from areas of turbulence (such as valves, reducers, and
elbows) and should have a full opening into the pipe free
from burrs, drill peels, and weld slag. Shutoff valves are
not required in the control line(s), but if installed, they
should be of the full opening type.
14. PILOT discharge:
Run 3/8 inch tubing from the pilot
OUTLET port to the downstream piping or to the con-
nection provided on the outlet of the Flowgrid
®
valve as
shown in the piping schematics.
STANDBY
MONITOR-NOTE:
To ensure full capacity
of a Standby Monitor regulator station, it is important
that the pilot discharge of the upstream regulator be
connected downstream of the station if the minimum
pressure drop (across the entire station) is below 60 psig.
15. VENT VALVES AND GAUGE CONNECTIONS:
Vent
valves and gauge connections are recommended in the
inlet and outlet piping to the Flowgrid
®
valve. A gauge
connection may be installed on the loading pressure
connection to the Spring Case of the Flowgrid® valve.
These would be a great convenience during start up,
maintenance, and operation.
16. INTERSTAGE PIPING (WORKING MONITOR):
On Working Monitor regulator stations the recommended
length of the interstage piping is 6 pipe diameters or
36-inches, whichever is greater. It is also recommended
that the interstage piping be swaged up 1 pipe diameter
over the nominal port size of the valve.
FOR EXAMPLE:
If a station has two 3” Single Port Flowgrid
®
valves, the
interstage piping should be at least 36-inches in length and
swaging up to a 4-inch pipe.
