Pulsafeeder Pre-Engineered Skid Systems - Manual (Page 9)

Pre-Engineered Skid Systems
Installation, Operation and Maintenance Manual
PES00039, Rev. B System Overview Page 9
Process Side, Continued…
Note comments on Process Side Piping/Tubing on the illustration, below:
Pressure Dissipation, Drain, Vent, Flush Provision
It is strongly recommended that this type of provision
be added to the process side of the injection system to
facilitate maintenance.
!
WARNING
When system pressure is dissipated or when
venting, spray may occur which could cause
serious harm or injury. Include provisions to
contain any possible spray as well as being able
to drain safely.
Pump
Pressure
Relief
Valve
Skid Outlet
Connection
Back Pressure
Valve
Process
Line
Anti-siphon/Back Pressure Valve
Locate as close as possible to injection
point to eliminate gravity feed or feed to a
low-pressure point such as a pump suction.
Low Pressure
Pump
Injector
Injection Line
Should be as short as possible.
Avoid extra-long lines.
Served Process
Often pipeline under pressure
Figure 5
Process Piping Considerations
Injection Point
Injected chemicals may be corrosive to piping. To minimize corrosive
effects, locate injector tip near center of process flow where velocities
and mixing are at their highest rate. Trim tip as necessary. For larger
pipe installations, longer injection assemblies are available.
Pipe
Injector Assembly
Figure 6
Injection Point