Type T205B
6
Startup
1. Open shutoff valves between the tank blanketing
regulator and the tank (both sensing and outlet).
2. Slowly open the supply line shutoff valve (to the
blanketing valve) and leave it fully open.
3. Monitor the tank vapor space pressure.
Adjustment
!
WARNING
To avoid personal injury, property
damage, or equipment damage caused
by bursting of pressure containing parts
or explosion of accumulated gas, never
adjust the control spring to produce an
outlet pressure higher than the upper
limit of the outlet pressure range (see
Table 2) for that particular spring. If the
desired outlet pressure is not within
the range of the control spring, install
a spring of the proper range according
to the Diaphragm and Spring Case Area
section of the maintenance procedure.
Adjust the regulator outlet (control) pressure setting
to meet the requirements of the specific application.
With a spring-loaded regulator, the pressure setting
may be adjusted to a value within the spring range
shown in Table 2. To adjust the pressure setting,
perform the following steps (key numbers are
referenced in Figure 6):
For internal flat circular adjusting screw
1.
Remove the closing cap (key 22).
2.
Use a 1-inch / 25 mm hex rod or flat screwdriver to
turn the adjusting screw (key 35) either clockwise
to increase outlet pressure or counterclockwise to
decrease outlet pressure. Always use pressure
gauge to monitor the tank blanketing gas pressure
when making adjustments.
3. After making the adjustment, replace the closing
cap gasket (key 25) and install the closing cap
(key 22).
For external square head adjusting screw:
1. Loosen the locknut (key 20).
2. Turn the adjusting screw (key 35) either clockwise
to increase outlet pressure or counterclockwise to
decrease outlet pressure. Always use pressure
Overpressure Protection
!
WARNING
Personal injury, equipment damage, or
leakage due to escaping accumulated
gas or bursting of pressure-containing
parts may result if this regulator is:
• Overpressured
• Used with incompatible process fluid
• Installed where service conditions
could exceed the limits given in the
Specifications section and on the
appropriate nameplate
• Where conditions exceed any
ratings of adjacent piping or
piping connections
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices to prevent service conditions
from exceeding those limits.
Type T205B regulators have an outlet pressure
rating lower than the inlet pressure rating. The
recommended pressure limitations are stamped on
the regulator nameplate. Some type of overpressure
protection is needed if the actual inlet pressure can
exceed the maximum operating outlet pressure
rating. Common methods of external overpressure
protection include relief valves, monitoring
regulators, shut-off devices, and series regulation.
Overpressuring any portion of the regulators beyond
the limits in the Specifications section may cause
leakage, damage to regulator parts, or personal injury
due to bursting of pressure-containing parts.
If the regulator is exposed to an overpressure condition,
it should be inspected for any damage that may have
occurred. Regulator operation below the limits specified
in the Specifications section and regulator nameplate
does not preclude the possibility of damage from
external sources or from debris in the pipeline.
Startup, Adjustment, and Shutdown
Note
The Specifications section and Table 1
provide the maximum pressure
capabilities for each regulator
construction. use pressure gauges
to monitor inlet pressure and
outlet pressure during startup and
adjustment procedures.
