Emerson SAPAG 8100 Series Installation And Operational Instructions

SAPAG
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.
www.valves.emerson.com
PED - Installation and Operational Safety Instructions
Direct Spring Operated Safety Valves
Before installation these instructions must be fully read
and understood
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 inlet 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 pressure setting, deform valve parts and adversely affect seat tightness and valve performance.
The valve should never be lifted or handled using the lifting lever.
When it is necessary to use a hoist, the chain or sling should be placed around the valve body and
bonnet in a manner that will insure that the valve is in a vertical position to facilitate installation.
Installation
Many valves are damaged when first placed in service because of failure to clean the connection
properly when installed. Before installation, flange faces or threaded connections on both the valve
inlet 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.
The gaskets used must be dimensionally correct for the specific flanges. The inside diameters must
fully clear the safety valve inlet and outlet openings so that the gasket does not restrict flow.
For flanged valves, draw down all connection studs or bolts evenly to avoid possible distortion of
the valve body. For threaded valves, do not apply a wrench to the valve body. Use the hex flats
provided on the inlet bushing.
Safety valves are intended to open and close within a narrow pressure range. Valve installations
require accurate design both as to inlet and discharge piping. Refer to International, National and
Industry Standards for guidelines.
Inlet 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. 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 inlet
connection of the valve.
Discharge piping
Discharge piping should be simple and direct. A "broken" connection near the valve outlet is
preferred wherever possible. All discharge piping should be run as direct as is practicable to the
point of final release for disposal. The valve must discharge to a safe disposal area.
Discharge piping must be drained properly to prevent the accumulation of liquids on the
downstream side of the safety valve.
The weight of the discharge piping should be carried by a separate support and 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.
If the valve is discharging into a pressurized system be sure the valve is a "balanced" design.
Pressure on the discharge of an "unbalanced" design will adversely affect the valve performance
and set pressure.
Fittings or pipe having a smaller inside diameter than the valve outlet connections must not be
used.
The bonnets of balanced bellows safety valves must always be vented to ensure proper functioning
of the valve and to provide a telltale in the event of a bellows failure. Do not plug these open vents.
When the fluid is flammable, toxic or corrosive, the bonnet vent should be piped to a safe location.
Emerson reserves the right to change the contents without notice SAPDR-0007-EN-1306