ROTARY LOBE PUMPING EQUIPMENT A. Design and Performance Requirements: 1. Pump shall be positive displacement, rotary lobe type. 2. Pumping equipment shall meet requirements of and comply with Schedule(s) of this Section. 3. Equipment shall be suitable for pumping a mixture of sludge (SL) at solids concentrations ranging from 2-3%. 4. Rotary Lobe Pumps shall be designed abrasion resistant. 5. All fluid-wetted parts including mechanical seal shall be replaceable through the quick release front cover without disassembly of the pump unit or connecting pipe system. 6. Pumps with seal water requirements are not acceptable. 7. Pumps shall be designed to temporarily run dry. 8. Pumps shall operate in either direction. 9. Pumps shall be suitable for continuous operation at all operating speeds specified. 10. Equipment shall be free from shock, vibration, cavitation, overheating, and excessive noise while operating at specified conditions. 11. 12. Design equipment so parts are readily accessible for inspection and repair, easily duplicated and replaced, and suitable for service specified. 13. All Rotary Lobe Pumping Equipment shall be designed to operate within a Class I Division 2, Group D hazardous rated environment PUMP CONSTRUCTION A. General: 1. Gearbox and intermediate chamber oil drain shall be easily accessible with side mounted drain screw. 2. Suction and discharge connections shall be 150-pound flanges with bolt hole dimensions and spacing to ANSI standards. 3. All cast iron parts shall be free from sand holes, blow holes, and other defects. B. Pump Casing and Protection Plates: 1. Shall be manufactured from Cast Iron, ASTM A48 grade 40, with a minimum hardness of 264 Brinell. 2. Rear of pump casing and front cover shall be protected with replaceable wear plates with a minimum hardness of 550 Brinell. 3. Front cover protection plate shall be reversible.
