Overview

Introduction

E/One sewer systems is a well-engineered system designed to provide low-pressure sewer service to individual residences or buildings. Correct installation and start-up of this equipment will ensure proper operation. This is a sewage handling pump and must be vented in accordance with national and local plumbing codes. This pump is not to be installed in locations classified as hazardous. All piping and electrical systems must be in compliance with applicable standards, local and national codes and to the satisfaction of relevant authorities.

The E-One station consists of a grinder pump, tank, pump alarm panel and connecting power (supply) cable. The tank is a polyethylene basin complete with a gasket-sealed lid. Sewage enters the tank through the 100 mm DWV uPVC (110.2 mm OD) (standard) inlet pipe where it is ground into fine particles by the grinder pump. The in-line pumping mechanism discharges the macerated sewage to a pressure or gravity main, then to a remote treatment site. The pump is a semi-positive displacement type capable of operating at discharge pressures up to 56m TDH. Ample tank storage capacity in conjunction with integral level sensing controls provides for economic, on-demand, operation of the grinder pump.

Pressure vs. Gravity

Why Use Low Pressure Sewers

Economical to install in rocky, sandy, wet, undulating terrain
Reticulation is shallow and HDD is frequently used for reticulation and laterals
Deep trenching, shoring, dewatering, site restoration is minimised
Wide range of economical system sizes (1-1000s)

Pump Suitability & Track Record

Environment One Corporation (E/One) invented pressure sewer systems and the residential grinder pump in 1969. Since then, E/One has lead the worldwide market and celebrates over 600 000 units sold across 43 countries. Many local governments, water authorities, contractors and top engineering firms trust and standardise on E/One.

The grinder pump is the heart of any pressure sewer system. The purpose built E/One grinder pump utilises a progressive cavity semi-positive displacement design. A progressive cavity pump is capable of achieving a high pressure and delivers nearly consistent flow across a wide range of system pressure. This enables pressure sewer systems to be considered appropriate for all terrains. Additionally, the progressive cavity pump is capable of pumping a sewage slurry without risks of blockages or jamming. Other pump designs specifically regenerative turbine pumps, fail when/ debris is present and therefore are only suitable for clean water applications. The use of a turbine pump in a pressure sewer system is not advised.

Design & Life Claims
Design and service life claims should be substantiated with data and user references. Laboratory life-cycle testing is not a suitable replacement for field data. Throughout E/One’s more than 49 years of designing and engineering products for pressure sewer applications, we have learned that laboratory data cannot be simply converted into field data. E/One routinely subjects products to the equivalent of 50 years through life-cycle testing. However, field data and customer feedback reveals actual mean time between service calls (MTBSC) of 10 years. Certain real world conditions cannot be adequately replicated in the laboratory. Recent competitor claims of longer service life are speculative and based on laboratory testing. No field data supports those claims.

Finally, there must be differentiation between the terms service life and design life. Zero preventative maintenance is required and recommended by E/One. In nearly all cases, the service life or interval is the point at which the wearing items may need to be replaced. After interval under normal conditions of an E/One pump is 10 years. The design life may represent the point at which a repair is no longer financially advisable. Under most conditions the design life of an E/One pump is expected to be 25 years.

E/One takes great pride in our history, market position, and level of service we provide our customers. We constantly design, engineer, and implement incremental improvements to our products to increase reliability and performance. We specifically avoid disruption to the customer from constantly changing the design of the pump. The E/One design is purpose built, continuously improved, and proven in the field.

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