2” NPT MULTI-PORT RELIEF VALVE MANIFOLD – SERIES
Form #996 Multi-Port Relief Valve Manifold IOM Rev B 11/05/15
INSTALLATION
!CAUTION!
Contact or inhalation of liquid propane, ammonia and their
vapors can cause serious injury or death! NH3 and LP-gas must
be released outdoors in air currents that will insure dispersion
to prevent exposure to people and livestock. LP-Gas must be
kept far enough from any open flame or other source of
ignition to prevent fire or explosion! LP-Gas is heavier than air
and will not disperse or evaporate rapidly if released in still
air.
Consult NFPA Codes 58 and 59 /ANSI/CGA 6.2.1 and/or any
applicable regulations governing the application and use of
pressure relief valves and relief valve manifolds. Make sure
you are thoroughly trained before you attempt to install,
inspector maintain this equipment.
*Proper installation is essential to the safe operation of the
relief valve manifold and pressure relief valves.
Install the MEC
relief valve manifold using the following steps:
1.
Verify that the start-to-discharge setting and manifold
flow rate capacity is correct for the application.
2.
Check that the relief valves are clean and free of
foreign material in the relief valve outlets.
3.
Inspect the manifold inlet and couple to ensure no
damage or foreign material is present.
4.
Install manifold NPT connection to container, couple,
or bung.
5.
Check for damage and proper operation after manifold
assembly installation.
6.
Rotate the valve selection handle to the home position
to ensure all reliefs are active.
7.
After the container is charged with product, check
joints for leakage using “Marshall Excelsior” leak
detector.
8.
If pipe-aways are installed, see section for pipeaway
installation.
9.
After installation is complete, ensure protective caps
are installed onto all relief valves.
INSPECTION AND MAINTENANCE
A pressure relief valve discharges when some extraordinary
circumstance causes an over pressure condition in the
container. If a pressure relief valve is known to have discharged,
the relief valve, as well as the entire system, should be
immediately and thoroughly inspected to determine the reason
for the discharge. In the case of discharge due to fire, the valve
should be removed from service and replaced.
Relief valves should be inspected each time the container is
filled but no less than once a year. If there is any doubt about
the condition of the valve, it must be replaced.
!WARNING!
Eye protection must be worn when performing inspection on
relief valves under pressure. Never look directly into a relief
valve under pressure or place any part of your body where the
relief valve discharge could impact it. In some cases a
flashlight and small mirror are suggested to assist when
making visual inspections.
In the case of a pressure relief valve that has opened due to a
pressure beyond its start-to-discharge setting, the chances of
foreign material lodging between the seat and the disc is low
however the possibility is always present. If the relief valve
continues to leak at pressure below its start-to-discharge
setting it must be replaced.
If there is any doubt about the condition of the relief valve, or if
the relief valve has not been protected by a cap for some time,
it should be replaced before refilling the container.
MANIFOLD INSPECTION / MAINTENANCE CHECKLIST:
(MINIMUM ONCE PER MONTH)
1.
Cap:
Check that the protective cap is in place over each relief valve
or pipe-away stack outlet and has a snug fit. The protective cap
helps protect the relief valve against possible malfunction
caused by rain, sleet, snow, ice, sand, dirt, pebbles, insects,
other debris and contamination.
REPLACE DAMAMGED OR MISSING CAPS AT ONCE AND KEEP A
CAP IN PLACE AT ALL TIMES.
2.
Weep Holes:
Inspect and clear debris from the relief valve weep holes. Dirt,
ice, paint, and other foreign particles can prevent proper
drainage from the valve body.
IF THE WEEP HOLES CANNOT BE CLEARED, REPLACE THE RELIEF
VALVE.
3.
Gear Set Weather Boot:
Check that the gear set weather boot is in place and in good
condition. This prevents water and contaminants from entering
the manifold valve gears.
MANIFOLD INSPECTION / MAINTENANCE CHECKLIST:
(MINIMUM ONCE PER YEAR)
1.
Valve Port Selection Handle:
Slowly rotate the valve selection handle through each port
position. This helps keep the gear set and manifold valve
components lubricated and working properly. Return the valve
selection handle to the home position to ensure all reliefs are
active.
2.
Relief Valve Spring:
Exposure to high concentrations of water, salt, industrial
pollutants, chemicals and contaminants could cause metal parts
to fail including the relief valve spring.
3.
Physical Damage:
Ice accumulations and improper installation could cause
mechanical damage.
IF THERE ARE ANY INDICATIONS OF DAMAGE, REPLACE THE
VALVE.
4.
Tampering or Readjustment:
Pressure relief valves are factory set to discharge at specified
pressures.
IF THERE ARE ANY INDICATIONS OF TAMPERING OR
READJUSTING, REPLACE THE VALVE.
