Rehabilitation of Two Vertical Centrifugal Backwash Pumps

The Work is to rehabilitate two vertical Centrifugal Backwash Pump used for cleaning of Water Treatment Granular Dual Media Filters and replace 14-inch Backwash Check Valve Number 1. Part 1: Rehabilitate Two Vertical Centrifugal Backwash Pumps Used for Cleaning of Water Treatment Granular Dual-Media Filters Perform the following work on one backwash pump at a time; the water treatment plant must always have at least one backwash pump operational. 1. Pull and remove pump for repairs. 2. Motor to be removed and set aside and vertically stored until pump work complete (note: both motors are in very good shape having been just reconditioned). 3. Install a new complete single-stage bowl assembly with specifications of 8650 gpm @ 45 degrees tdh, 125 hp, 880 rpm. 4. Install a new reducing column to connect new bowl assembly to discharge head. 5. Install a new stainless steel line shaft with coupling. 6. Install a new stainless steel motor shaft with applicable hardware. 7. Shot blast existing discharge head to clean surfaces. 8. Rebuild existing stuffing box. 9. Epoxy coat entire pump and motor (color Sherwin Williams SW 7650 Ellie Gray or equivalent). 10.Install repaired pump. 11.Install motor back on pump and set impeller clearance. 12.Ensure pump operation for a minimum of one week. Correct any issues that arise. Perform final touch-up of paint on pump and motor as needed. 13.Once contractor and plant staff are confident pump is fully operational, then repeat process on second backwash pump. Part 2: Replace 14-inch Backwash Check Valve Number 1 : 1. Remove 14-inch lever and weight check valve from the manifold. 2. Install new 14-inch lever and weight check valve. 3. Modify the manifold to accommodate new check valve. 4. Must ensure air-release valve remains hard piped. 5. Modify or set a new concrete support to properly hold new check valve. 6. Epoxy coat check valve (color Sherwin Williams SW 7650 Ellie Gray or equivalent).

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 03 -	Concrete, Cast-in-Place Concrete.
Division 22 -	Plumbing, Plumbing Piping, Plumbing Equipment.
Division 26 -	Electrical, Instrumentation and Control for Electrical Systems.
Division 33 -	Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Water Utility Pumping Stations, Wells.
Division 44 -	Pollution and Waste Control Equipment, Water Pollution Control Equipment.