Section 2 - Installation - Emerson VANESSA 30,000 Series Installation, Operation And Maintenance Manual

VANESSA SERIES 30,000 TRIPLE OFFSET VALVE (TOV)
INSTALLATION, OPERATION AND MAINTENANCE MANUAL

SECTION 2 - INSTALLATION

2.1 Valve inspection
1. Carefully remove the valve from the
shipping package (box or pallet) avoiding any
damage to the valve or, in case of automated
valves, to the electric or pneumatic/
hydraulic actuator or instrumentation.
2. The valves are shipped with the ends protected
with caps and a thin layer of protective grease
(where applicable according to the valve
material selection). Before installing the valve,
remove the caps and clean carefully, then
de-grease both surfaces with a solvent. Clean
the inside of the valve using an air line. Ensure
that there are no solid objects such as pieces
of wood, plastic or packing materials inside the
valve or on the valve seat.
3. Inspect the seal ring to ensure that
it was not damaged during handling.
This is especially important in case of
valves shipped with the disc set in the open
position and with "fail-open" actuators.
4. Ensure that the packing gland-adjusting
nuts against the packing gland flange
cannot be loosened by hand.
WARNING
Ensure that the materials of construction listed on
the valve nameplate (refer to figure 12 on page 12)
are appropriate for the service intended and conform
to the contractual specifications/requirements. Also
ensure that the valve pressure/temperature limits
shown on the valve nameplate (refer to figure 12 on
page 12) are suitable for the process conditions. If in
doubt contact your nearest Emerson sales office.
2.2 Valve installation
Vanessa double flanged, lug, wafer valves
are suitable to be installed in accordance
with ASME B16.5, ASME B16.47 or EN 1092.1
requirements, without limiting the applicability
criteria.
Flange finish and face dimensions are fully
in accordance with the applicable standard,
without gasket seating surface interruptions
(which are allowed by API 609 par. 5.7).
In case of non-standard flanges the installation
conditions are agreed during the flange
dimensioning.
The optimal installation is setting the valve with
the shaft in the horizontal plane. The second
best option is to have the shaft at an angle
to minimize problems associated with solid
particles present in the fluid that otherwise
could deposit in the lower bearing area.
Unless otherwise recommended, the valve
should be installed with the disc in the closed
position to ensure that the seal ring in the disc
is not damaged during installation. Particular
care should be given to those valves equipped
with 'fail-open' actuators.
For operating temperatures above 200 °C
(392 °F) thermal insulation of the valve body is
recommended.
WARNING
If the valve has threaded tapped holes in the hub
areas, it is recommended to use stud bolts with
nut to connect the valve in this zone. The depth
of the tapped holes in the bodies of all Series
30,000 valves is specified in the product technical
documentation provided with the relevant supply.
Failure to use the correct studs dimensions may
result in serious injuries, flange leakage, damage to
the valve thread.
NOTICE
It is recommended to perform piping flushing before
installation of valve.
When this is not possible, valves must be set with
the disc in full open position before starting the
flushing operation.
NOTICE
The valve trim is designed to withstand and to seal
against the design differential pressure marked on
the valve nameplate (refer to the nameplate template
provided on page 12).
When positive isolation is required including isolation for
safe access to downstream line, as a minimum the valve
shall be installed with high pressure facing the preferred
isolation side of the valve, the so-called "positive
isolation side" or "shaft side".
The valve trim shall not be used as a sole protective
mean against the hazard caused by the closed valve
upstream pressure.
Additional precautions against pressure hazard risks
shall be taken into consideration by end users based on
their own piping risk assessment.
If the valve has welded ends, perfectly clean and
degrease the ends to be welded (of both valve and
pipe), using a cloth with acetone or a similar product.
Insert correctly the valve between the edges of the
pipe to be welded by taking into consideration the
plate that indicates the preferential side for sealing.
Carry out an initial accurate spot welding verifying the
perfect alignment of the edge and axis of the valve.
Carry out the welding of the edge by proceeding in
alternate way on both sides to reduce the tensions
introduced by the welding. It is important to follow
the relevant preheating and interpass temperature
prescriptions.
Handling and lifting of the valves during installation
MUST be performed by following the same criteria and
instructions described in previous points "1.2 Handling
requirements" and "1.3 Storage and preservation
before Installation".
Isolation applications
The installation direction affects valve operating
torques and sealing performances. An indication
plate "ΔP" (figure 2) is applied on the high
pressure shutoff side when valve is closed as a
Sealing side when closed
FIGURE 2
reference for the direction of the installation.
The best sealing performance, also for bidirec-
tional services, is ensured when pressure acts on
the shaft side of the valve, and is recommended
when the service tightness requirements are
more stringent in one specific direction.
Control applications
Perfect sealing is not required. The "ΔP" plate
may be fixed on either flange indicating the
preferred direction. Adhere to the direction of
installation indicated on the relevant flange as
the selection of the actuator has been made for
that specific direction of installation.
CAUTION
Whenever the pipe is internally lined, the disc
must not come into contact with the lining during
its stroke.
Such verification is critical especially in case of
lug and wafer body style in order to avoid any
damage to the valve.
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