Groth 1720A - Manual (Page 4)

4
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 MAWP and flow requirements
of the system. Consult API Standard 2000 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 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 valves’ 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. 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.
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.
INSTALLATION:
A typical valve installation on a tank or vessel
is illustrated in Fig.1 on Page 3 using a Model
1720A Pressure/Vacuum Relief Valve.
Groth's weight loaded Pressure/Vacuum
Relief Valves are designed to provide tank
protection for both pressure and/or vacuum to
+/-1 PSIG settings. The valves provide full
rated flow capacity at 100% over-pressure.
Consult factory for performance under other
conditions.
WARNING: The valve must be installed in a
vertical position as shown in Fig 1. To
achieve nominal flow capacity, the tank
nozzle bore must be at least the same
nominal dimension as the relief valve inlet
body.
This series of valves all have 150# ANSI
flange drilling compatibility. Torque
guidelines are listed in Table 1. The valves
are NOT rated for full flange pressure and do
not require high bolting torque. Consult
factory for special applications.