Hi-Lo Enclosed Multistack Flares can be tailored to suit customer
requirements.
www.Hilogroup.com: Multistack Philosophy
Multistack Philosophy
On plant signal or pressure increase signal in flare feed line ignition
sequence initiates.
Ignition Sequence
Pilot solenoid valve energizes allowing gas to pilot, sparker sparks
lighting pilot – pilot recognition signals to PLC control, pilot lit.
Typical for all stacks.
Once pilot established air operated slam shut valve opens via the
operating solenoid valve allowing main gas to flare stack. Gas passes
pilot lighting main gas.
Temperature probe in stack picks up temperature indicating main flame lit.
Pilot stays on with constant monitoring.
Variable tip motor controls flare tips to keep a set velocity and back
pressure on flare tip.
This will open the orifice of the tip as the pressure increases allowing
more gas to the flare.
Upon main flame or pilot failure the associated slam shut valve closes.
Ignition for the stack will operate and once pilot satisfactory valve
opens allowing gas back to flare.
If pilot fails to light after 3 attempts alarm is given for assistance for
that particular stack.
On shut down of gas from plant, pressure transmitter in feed line
indicates low pressure closing slam shut valves and pilot solenoid valves
for all stacks.
System waits for start signal.
This philosophy can be tailored to bring on half the stacks at one
pressure point and the others when pressure rises above a second set point
if required.
Main Component list
1
x
Process container complete with internal lighting (zone 1) Housing:-
Flow lines
2 x Knock Out Pots
Inlet Pressure Transmitter
Inlet Temperature Transmitter
Air circulation fan
} Rates for
} Zone 1
}
1
x
Control Room container complete with internal lighting (safe area)
Housing:-
PLC Cabinet/Control
Power established cabinet
Air circulation fan
Cabling
10
x
Flare stacks – refectory lived each with manual air intake
vents,
Flame Arrestors
Flame Temperature probes
Tip control motor – zone 1
Pilot ignition system
Pilot solenoid valve – zone 1
Air operated slam shut valve
Slam shut solenoid valve
Pressure transmitter – zone 1
Manifold manufactured to Nace MR-01-90 and tested to your specification.
Cabling between containers and stacks.
Pipe work between containing and stacks
Area required for flare system based on the above.
60m x 20m
This will allow for any upgrade required to a maximum number of stacks.
