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(Write this 4% down for your use in your size calculation).
IN THE EXAMPLE ABOVE, IMAGINE: YELLOW REPRESENTS A CATALYST, BLUE AN ACCELERATOR, RED IS A MAIN FLOW MADE OF TWO LIQUIDS, AND THE TOTAL FLOW IS BEING MIXED IN A STATIC MIXER AND SENT TO THE HEAT OF A RETORT TO CAUSE A REACTION.
Assume that at least one substance must remain pressurized to prevent gassing. Instead of mixing batches in a pressurized vessel by positive agitation, you may pump continuously through a convoluted flow path called a static mixer. The element that causes the mixing, the convolutions are static - not the flow.
Set the pump displacing the yellow catalyst to a required rate, and the blue pump to a suitably proportionate rate. Now if you set all the pumps to surge at the same time to ensure mixing, there will be massive induced acceleration head pressure pulsation.
Conversely, if they displace their substances sequentially, then there will be little pulsation, but the substances will pass through the mixer one after the other, and not become properly mixed.
You may have the best of both ways, by using a pulse damper, so that the pumps may deliver at what ever rate and time you require, yet the stream of each substance is constant from the damper into the static mixer.
UNDERSTANDING FLOW OR PRESSURE PULSATION
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