2″ AODD Pump Failures That Had Nothing to Do With the Pump

A customer was using a 2″ non-metallic AODD pump to transfer chemical from the ground floor to a second-floor filter press. The pump kept failing despite repeated repairs.

Diaphragms failed frequently, air valve icing was common, and leakages appeared at manifolds and chambers. Maintenance costs kept increasing.

The Root Cause

A pressure gauge installed on the discharge line revealed continuous back pressure caused by a vertical lift of more than 15 meters.

This back pressure was silently damaging diaphragms, causing air valve icing, and creating leak paths at joints.

The Fix

An NRV was installed in the discharge line. Back pressure was eliminated, pump operation stabilized, and diaphragm life improved significantly.

The result was a saving of more than ₹5 lakhs per pump per year in maintenance and spares.