BID - Positive Displacement Rotary Lobe Pump 2004

This document outlines specifications for the installation, operation, and maintenance of equipment in a wastewater treatment system. It specifies that a comprehensive manual should be provided, including drawings, equipment lists, and instructions for operation and maintenance. The manual should be provided in both physical and electronic formats. A factory-trained instructor should also be provided to train the owner's representatives on proper operation and maintenance. The document also mentions the provision of special tools and spare parts, which should be properly labeled and protected for long-term storage. It emphasizes the need to protect all equipment and parts from damage during shipment, storage, and handling. The equipment supplied should be from reputable manufacturers and designed for 24-hour continuous service without overheating, cavitation, or excessive vibration or strain. Stainless steel nameplates should be attached to each pump, motor, and control panel, providing relevant data. The equipment should also have interchangeable parts for easy replacement and repair in the future. The document specifically focuses on the specifications for pumps in the wastewater treatment system. It mentions that the pumps should be of the positive displacement, rotary lobe type, capable of handling primary and secondary wastewater sludge. The pumps should be designed to ensure long operating life, with no significant change in vibration and noise levels. The maximum motor speed should not exceed 1800 rpm, and the pumping capacity should be rated at 300 gallons per minute at 35 psi discharge pressure. The pump construction specifications include details about the materials used, such as gray cast iron casing and end cover, and a reversible front wear plate made of Hardox 500 material. The pumps should utilize four HiFlo six-lobe rotors or equivalent, with convoluted rotor vane geometry for pressure-pulse free operation. The rotors should be positioned and secured to the shaft using replaceable hardened keyways and expansion bolts. The shafts should be made of carbon steel ASTM A293 fitted with replaceable ceramic coated stainless steel sleeves where passing through the seal area.