Emerson ANDERSON GREENWOOD Series User manual

ANDERSON GREENWOOD SERIES 96A VACUUM BREAKER
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Before installation these instructions must be fully read and understood
Service technicians are available to assist
with your installation or other field problems.
Callyour nearest Emerson representative.
WARNING
If a gagging device is provided with the valve it
must be removed before the valve is put into
service.
• Removal of the seal wires in an attempt to adjust
and/or repair this product by unauthorized or
unqualified persons voids the product warranty
and may cause damage to equipment and
serious injury or death to persons.
• This product is a safety related component
intended for use in critical applications.
The improper application, installation or
maintenance of the valve or the use of parts or
components not manufactured by Emerson
may result in a failure of the valve.
• Any obstruction due to polymerization,
solidification or solid deposit will affect
thesafety performance of this valve. Methods to
reduce such risk should be taken.
• A vacuum breaker should be used only to
protect a system from underpressure during a
vacuum upset. It should not be used as a control
SAFETY PRECAUTIONS
• When the safety valve is under pressure never
place any part of your body near the outlet of
the valve.
• Always wear proper safety gear to protect
hands, head, eyes, ears, etc. anytime you are
near pressurized valves.
• Never attempt to remove the safety valve from
asystem that is pressurized.
• Never make adjustments to or perform
maintenance on the safety valve while in
service unless the valve is isolated from
thesystem pressure. If not properly isolated
from the system pressure, the safety valve may
inadvertently open resulting in serious injury.
• Remove the safety valve prior to performing any
pressure testing of the system.
• The safety of lives and property often depends
on the proper operation of the safety valve.
The valve must be maintained according
to appropriate instructions and must be
periodically tested and reconditioned to ensure
correct function.
• For further information including adjustment,
maintenance, cleaning lapping and detail
illustrations obtain the appropriate Operation and
Maintenance Manual from the table at Section 6.
This manual may be requested from the factory
or is available at www.valves.emerson.com
valve that is required to operate continuously
or as a block valve to isolate portions of the
system. It should not be used as a pipe fitting or
transition piece in a piping system.
• Any installation, maintenance, adjustment,
repair or test, performed on the safety
valve must be done in accordance with
the requirements of all applicable Emerson
Procedures and Instructions as well as applicable
National and International Codes and Standards.
• The information, specifications and technical
data (the “Specifications”) contained in this
document are subject to change without notice.
Emerson does not warrant that the
Specifications are current and assumes no
responsibility for the use or misuse thereof. The
purchaser should verify that there have been no
changes to the Specifications prior to use.
VCIOM-06035-US 14/11
Engineering Doc. #05.9040.220 Rev. D
Emerson.com/FinalControl © 2017 Emerson. All rights reserved.

2
3 INSTALLATION
Many valves are damaged when first placed
in service because of failure to clean
theconnection properly when installed.
Beforeinstallation flange faces on both
thevalve and the vessel and/or line on which
the valve is mounted must be thoroughly
cleaned of all dirt and foreign material.
Because foreign materials that pass into and
through safety valves can damage the valve,
the systems on which the valves are tested and
finally installed must also be inspected and
cleaned. New systems in particular are prone
to contain foreign objects that inadvertently get
trapped during construction and will destroy
the seating surface when the valve opens.
Thesystem should be thoroughly cleaned
before the safety valve is installed.
Foam padding is sometimes used to protect
themain valve seat during shipping. Check for
any foam padding inside the main valve and
remove before installation.
NPS 4 NPS 6 NPS 8 NPS 12 NPS 16
18 ft·lb 32 ft·lb 32 ft·lb 51 ft·lb 76 ft·lb
24 Nm 43 Nm 43 Nm 69 Nm 103 Nm
Safety valves are intended to open and close within a narrow pressure range.
Valveinstallationsrequire accurate design as to vessel piping. Refer to International,
NationalandIndustry Standards for guidelines.
ANDERSON GREENWOOD SERIES 96A VACUUM BREAKER
INSTALLATION AND MAINTENANCE INSTRUCTIONS
1 GENERAL
The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product.
This safety valve should only be used in
accordance with the applicable operating
instructions and within the application
specifications of the purchase order.
These valves have been tested and adjusted
at the factory. Contact the factory or a Emerson
authorized representative before making any
changes to the settings.
2 STORAGE AND HANDLING
Because cleanliness is essential to
thesatisfactory operation and tightness
of a safety valve, precautions should be
taken during storage to keep out all foreign
materials. Inlet and outlet protectors should
remain in place until the valve is ready to be
installed in the system. Take care to keep
the valve connections absolutely clean. It is
recommended that the valve be stored indoors
in the original shipping container away from dirt
and other forms of contamination.
Safety valves must be handled carefully and
never subjected to shocks. Rough handling may
alter the vacuum setting, deform valve parts
and adversely affect seat tightness and valve
performance.
When it is necessary to use a hoist, use
thelifting eye(s) on the main valve body. If there
are no lifting eyes a chain or sling should be
placed around the main valve body in a manner
that will ensure that the valve is in a vertical
position to facilitate installation.
The vacuum inlet screen is covered and
thepallet is secured to the plastic protective
cover with lockwire to prevent damage during
shipment. Remove the plastic cover and wire.
Install the safety valve. Refer to Figure 1.
The gaskets used must be dimensionally
correct for the specific flanges. The inside
diameters must fully clear the safety valve
vessel or line connection openings so that
the gasket does not restrict flow. Make sure
that the safety valve is installed with sufficient
air flow clearance around the vacuum inlet.
Drawdown all connection studs or bolts evenly
to avoid possible distortion of the valve body.
Themaximum torque for flange bolting for
valves with aluminum bodies should not exceed
the values shown in the following table.

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ANDERSON GREENWOOD SERIES 96A VACUUM BREAKER
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Capped Series 96A Series 96A with
pressurerelief valve
OPERATION AND MAINTENANCE MANUAL
Valve model Operation and maintenance manual
Series 96A VCIOM-06027 (05.9040.084)
4 INLET PIPING
No inlet piping is required. The 96A vacuum
breaker is a weighted pallet vent designed to
breathe in atmospheric air.
6 SET VACUUM VERIFICATION TESTING
Set vacuum verification testing should be
performed in accordance with instructions in the
applicable Operation and Maintenance Manual.
5 DISCHARGE PIPING
Connect this valve as direct and close as
possible to the vessel being protected.
Thevalve should be mounted vertically in an
upright position either directly on a nozzle from
the pressure vessel or on a short connection
fitting that provides a direct, unobstructed
flow between the vessel and the valve. Refer to
Figure 1. Installing a safety valve in other than
this recommended position will adversely affect
its operation.
The valve should never be installed on a fitting
having a smaller inside diameter than the vessel
or line connection of the valve. Fittings or pipe
having a smaller inside diameter than the valve
outlet connections must not be used.
This piping should be designed to carry theweight
of the valve and should be properly braced to
withstand reactive thrust forces when the valve
relieves. The valve should also be supported to
withstand any swaying or system vibrations.
After installation, there must be positive
pressure at this piping to establish a differential
force across the moving member and “load”
the valve in the closed position. On normal
start-up, the vent loads itself without incident
as pressure increases.
FIGURE 1
© 2017 Emerson. All rights reserved.