Groth 3000 Series - Manual (Page 6)

3
SAFETY
GENERAL INSTRUCTIONS
This section is intended as an overview of safety
guidelines that should be followed during the
installation, operation and maintenance of Groth
Series 3000 Gas Blanketing Regulator. To
understand the context of these warnings and
instructions, read and understand this complete
manual.
The gas blanketing regulator is one of the principal
protection devices typically installed on a product
storage tank. It is a precision regulator that is
designed to maintain a positive pressure on the tank.
This will prevent product loss or contamination from
atmospheric air when pumping liquid out or when the
stored fluid cools.
WARNING
1. In the event of an actuator or body diaphragm
failure, the regulator will fail in the OPEN
position. Gas flow will NOT be shut off.
Operating and emergency pressure relief valves
must be sized to flow regulator capacity in
addition to normal and emergency venting
requirements.
2. Gas Blanket Regulator flow capacity is based on
tests conducted with five feet of 1" SCH. 40
discharge piping. Consult factory for capacity
data if regulator is to be installed with longer
pipe or numerous fittings or valves between the
regulator and the tank it is blanketing.
3. The regulator is normally factory set at the
desired set pressure and orifice restriction.
These settings and spring range are stamped on
the nameplate. DO NOT attempt to readjust the
set pressure beyond the limits specified in Tables
3, 4 and 5.
4. The regulator is to be connected to the tank or
vessel with a minimum 0.300" ID tubing sense
line. This line must be kept open and
unobstructed to ensure that the regulator
"senses" the actual tank pressure. For some
applications, a nitrogen purge may be required
to ensure that this line remains open. Consult
factory for recommendations.
5. DO NOT attempt to remove the regulator from
the line or perform field repairs in line without
first isolating the regulator from both the tank
and the supply gas line. Bleed all pressure
before removing the spring bonnet or the flow
orifice locking screw, or opening up the actuator
cases.
6. Note the orifice sleeve position when
disassembling the regulator. It was factory set
according to the flow requirements listed on the
order and must be re-installed in the same
position to ensure the correct flow.
7. The regulator body and actuator case are
exposed to process vapors. Observe all safety
precaution as specified on the Material Safety
Data Sheet for the products that are in the tank.
8. The vents on the spring bonnet and upper case
must both be clean and open to the atmosphere
and should be inspected periodically.