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GE Oil & Gas
3.1 Preliminary Steps
A. Before installing the valve in the line, remove all
traces of foreign material from the piping such as
welding chips, scale, oil, grease, etc.
B. Note down all the data given on the serial plate.
C. For valve inspection without interrupting process
operation, a hand-operated stop valve will be
required on either side of the VariPak, together with a
hand-operated throttling valve mounted on a bypass
line.
3.2 Valve Installation (Figures 7, 8 and 9)
Connections: The body of the ANSI Class 1500* rated
VariPak valve can be:
- Bolted between 25 mm (1") pipe flanges machined to
standards ISO-PN 10 to PN 250 (ANSI 150 - 300 - 600 -
900 and 1500 lb).
Use ASTM A 193 Gr B 7 (or equivalent) carbon steel
bolting for temperatures between -29° and +350 °C.
For corrosive or cryogenic service, use ASTM A 193 Gr
B8 strain-hardened stainless steel. All the line bolting
required for installation can be supplied by GE on
request.
Figure 7 - VariPak flanged connection
- Connected by 25 mm flanges machined to standards
ISO-PN 20, 50 and 100 (ANSI 150, 300 and 600 lb).
Fit gaskets compatible with service conditions between
the valve body and the pipe flanges.
Figure 8 - VariPak flanged body
The VariPak valve body can be supplied on request with
1/2", 3/4", or 1" NPT threaded ends. Apply PTFE tape or a
sealing compound compatible with the process to the
threaded pipe ends.
Figure 9 - VariPak screwed connection (option)
Alignment: This valve is small and light, making it easy
to install on the piping. Support the valve body when
fitting studs. Suitably shaped bosses are provided to
center the valve in the line and prevent rotation before
the studs are finally tightened.
The valve must always be installed with "flow tending
to open". The flow arrow on the valve body must be
pointing in the direction of flow. Fit the bolts and tighten
in criss-cross fashion.
3. Installation
