Liquid Dynamics International Ltd. - Piping System Analysis / Piping System Simulation

LDi - P17 / B

Dosing systems
Air operated double ended diaphragm
Multi-layer PTFE diaphragm metering systems

Lost motion, Solenoid, and LP dosing pump systems
The pressure pulses are irrelevant but constant flow required for good mixing.
In place flushing, actual damper installation method
In place flush PipeHugger LP with EPDM in 316L, PVC, or Hastelloy B2
FlexFlon (modified Teflon) FlexOrber
PipeGuard with EP or Butyl and PVC
PipeGuard 316 stainless steel with Nitrile

Multi PTFE layer, HP diaphragm "metering" pump systems
A.O.D.e.D. with large air pipe or with small air pipe
The force resets metering diaphragm
Poor suction behavior due to large volume decompression delay
Large dead process and drive fluid volumes
Multi-layer "sandwich" diaphragm pumps are used to inject catalysts into reaction vessels.
The explosive decompression, plus "velocity jump" acceleration, coming from low volumetric efficiency generates a shock wave. The wave travels at 3500 mph into the reaction. The front of the wave is higher temperature than the trailing end; impact + temperature assists catalytic reactions.
The shocking pulsation created by this machine type is so exceptional compared to any system characteristics that it is more effective to analyze the machine first, and later to determine the system responses.
There are "pulsation interceptors" with secondary containment seal, tell tale alert from between 2 layer PTFE membranes, and all feature for ideally matching these machines.

Before analyzing system pressure amplitude at frequency and causes, determine acceptable maximums. Below are suggestions. Percentages are of theoretical steady state condition.

Pulsed magnetic field “mag meter”, 3%
Paddle wheel meter, 2%
Turbine meter, 1.5%
Coriolis vibrating tubes meter, 1%
“Delta P” orifice meter, 1 psi max
Vortex shedding, .75%
Spinnerette heads. 0.1% DQ
Denier checked by laser beam precisely
Film thickness control, 0.2%
Web coating