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INSTALLATION NOTES: (See Figure 1)
1. Minimum clearance between tank roof and vacuum inlet port must be at least equal to the valve
nominal flange bore.
2. Tank nozzle bore must be greater than or equal to the valve inlet flange bore.
3. Inlet and outlet piping loads must be supported by appropriate structural supports, NOT by the
valve body.
III. SAFETY WARNINGS
This section is an overview of safety guidelines that should be followed during the
installation, operation and maintenance of Groth Pressure/Vacuum Relief Valves. To
understand the context of these instructions and warnings, it is necessary to completely
read and understand the contents of this manual.
The purpose of a weight loaded pressure/vacuum relief valve is to prevent excessive
pressure or vacuum in a tank or process system. The valve must be designed for the
proper Maximum Allowable Working Pressure (MAWP) and flow requirements of the
system. Consult API Standard 2000, ISO 28300, or local regulations for tank protection
sizing procedures. An improperly specified or functioning relief valve may result in
structural damage to the tank or system, and can cause severe personal injury or death.
Valves are set at the factory according to purchase order specifications. Do NOT change
pressure ratings by adding additional weights to the pallet assembly without consulting the
factory or your local Groth representative. Adding weights to a valve may restrict pallet lift
and reduce the valve’s rated flow capacity.
DO NOT mix pressure/vacuum pallet assemblies. Failure to ensure that both pallet
assemblies are installed in the correct location can change the pressure and vacuum relief
settings or restrict lift of the pallet. This can cause a tank failure.
DO NOT attempt to remove the valve from the tank or process vessel without first bleeding
all pressure from the system. ALTERNATIVE MEANS OF PRESSURE RELIEF MUST BE
PROVIDED WHEN THE VALVE IS OUT OF SERVICE.
If the valve has been exposed to process vapors while in service, observe all plant
procedures and Material Safety Data Sheets (MSDS) for the products in the system when
inspecting, adjusting or servicing the valve. Take appropriate safety precautions regarding
eye protection, respiration and skin contact.
The tank pressure required to discharge the normal or emergency venting requirements of
the tank will be increased by the amount of back pressure in the discharge header, on a
pipe away valve configuration. Maximum possible discharge header pressure must be
considered when sizing the pressure relief valve.
IV. INSPECTION AND STORAGE
The pressure/vacuum relief valve is carefully packaged to prevent damage or contamination during
shipping. Inspect all equipment when it is received; report any damage to the carrier immediately.
The valve should be protected during handling and storage. Keep all the ports plugged to prevent
intrusion of foreign materials. Before installation, inspect the unit for indications of physical
damage or internal contamination. If these are observed, the valve must be disassembled,
cleaned and repaired before installation.
(18 pages)
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