Preparation For Installation - Samson 3251 Mounting And Operating Instructions

5.2 Preparation for installation

Before installation, make sure the following
conditions are met:
− The valve is clean.
− The valve and all valve accessories (in-
cluding piping) are not damaged.
− The valve data on the nameplate (type
designation, nominal size, material,
pressure rating and temperature range)
match the plant conditions (nominal size
and pressure rating of the pipeline, me-
dium temperature etc.). See the 'Mark-
ings on the device' chapter for name-
plate details.
− The requested or required additional
pipe fi ttings (see section 'Additional
fi ttings' in the 'Design and principle of
operation' chapter) have been installed
or prepared as necessary before
installing the valve.
NOTICE
!
Risk of control valve damage due to incor-
rect insulation.
Î Only insulate control valves up to the
bonnet fl ange of the valve body (see
Fig. 5-1). This also applies to versions
with bellows seal or insulating section at
medium temperatures below 0 °C or
above 220 °C. If the insulating section is
insulated, it will not function properly.
Î Do not insulate valves mounted to com-
ply with NACE MR 0175 requirements.
EB 8052 EN
  
Fig. 5-1: Limit of insulation for control valves
Proceed as follows:
Î Lay out the necessary material and tools
to have them ready during installation
work.
Î Flush the pipelines.
Note
The plant operator is responsible for clean-
ing the pipelines in the plant.
Î For steam applications, dry the pipelines.
Moisture will damage the inside of the
valve.
Î Check any mounted pressure gauges to
make sure they function properly.
Î When the valve and actuator are al-
ready assembled, check the tightening
torques of the bolted joints (u AB 0100).
Components may loosen during trans-
port.
Installation
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5-3