Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC

Home Browse Search

RECOMMENDATIONS FOR SEWER LINE CLEANING INTENT The intent of sewer line cleaning is to remove foreign materials from the lines and restore the sewer to the original carrying capacity. Since the success of the other phases of work depends a great deal on the cleanliness of the lines, the importance of this phase of the operation is emphasized. It is recognized that there are some conditions such as a broken pipe and major blockages that prevent cleaning from being accomplished or where additional damage would result if cleaning were attempted or continued. Should such conditions be encountered, the contractor should seek further advice from the owner. CLEANING EQUIPMENT High-Velocity Jet (Hydro cleaning) Equipment: All high-velocity sewer cleaning equipment shall be constructed for ease and safety of operation. The equipment shall have a selection of two or more high-velocity nozzles. The nozzles shall be capable of producing a scouring action from 15 to 45 degrees in all size lines designated to be cleaned. Equipment shall also include a high- velocity gun for washing and scouring manhole walls and floor. The gun shall be capable of producing flows from a fine spray to a solid stream. Mechanically Powered Equipment: Bucket machines shall be in pairs with sufficient power to perform the work in an efficient manner. Machines with direct drive that could cause damage to the pipe should be avoided. A power rodding machine shall be either a sectional or continuous rod type capable of holding a minimum amount of rod to complete the line segment. The rod shall be specifically heat treated steel. To insure safe operation, the machine shall be fully enclosed and have no automatic safety clutch or relief valve. CLEANING PRECAUTIONS During sewer cleaning operations, satisfactory precautions shall be taken in the use of cleaning equipment. When hydraulically propelled cleaning tools (which depend upon water pressure to provide their cleaning force) or tools which retard the flow in the sewer line are used, precautions shall be taken to insure that the water pressure created does not damage or cause flooding of public or private property being served by the sewer. When possible, the flow of sewage in the sewer shall be utilized to provide the necessary pressure for hydraulic cleaning devices. When additional water from fire hydrants is necessary to avoid delay in normal work procedures, care should be taken not to block access to the fire hydrants in case of fire in the area served by the hydrant.