We're using a 1.5" peristaltic pump to empty a vertical container in a smooth and stable rate (around 30L/min).
What we noticed is a repeatable distortion in the flow rate caused by the peristaltic tube volume change due to the pump.
Roller engagement, causing momentary back flow. This phenomena is highly unwanted by us since it causes a pulsing  flow pattern.
We're looking for a solution for that.

Use a multi-cavity (triplex) piston/plunger/diaphragm pump.

Along the same principle as triplex and other multi-cavity pumps, try ganging three or more peristaltics together, with the cam lobes timed 360/n/3 degrees apart (n = number of cam lobes).  If you must stay with peristaltics.

To scsp: Metering pump suppliers in Israel

Simtec Equipment & Technologies (agent of Seybert & Rahier)
P.O. Box   
31062 HAIFA  
Phone: +972 48341282  
Fax: +972 48345891  

Petrus Technical Supplies Ltd. (agent of Bran & Luebbe)
60 Medinat Hayehudim St.
P.O. Box 2056
Herzlia 46766
Phone: +972 9 - 958 76 70
Fax: +972) 9 - 958 77 26

MBL, Solids Liquids
Separation Engineering Limited (agent of Lewa)
P. O. Box 3 36 47
Tel Aviv 61336
Phone +972 3 5464-578
Fax +972 3 5464-569

No, I think 30 l/min is not too much for a metering pump. But I'm not working for a metering pump manufacturer. So I'm not an expert.

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