Improved Clog Resistance Testing Methodology for Wastewater Pumps with Flygt Adaptive Impeller Design

Abstract

Existing methodology for testing and comparing the clogging
resistance of advanced wastewater pumps in Xylem laboratory was
assessed in relation to how it accommodates evolving modern
wastewater materials and their limitations. Recirculation design
was tested and evaluated against a set of decision criteria using
Pugh’s decision-making model. The recirculation design was
modeled in this study as the final methodology to assess upper
volume clogging resistance. Experiments were designed for this
methodology and validation tests were carried out using Flygt
N3085SH (standard and Upgraded version) and N3069SH pumps
with a combination of parts from the small product range. The
outcome from experiment indicates an average weight of the
residual outcome for the upgraded version of the N3085SH to be
93.85% less than the standard version, making it a better version.
Full size (diameter Ø140mm) N3069SH impeller showed better
upper volume clogging resistance compared to impellers with
Ø122mm with a dish and Ø115mm without a dish. The results
achieved with this methodology validate its efficiency.