AWWA B604:2018 pdf download.Granular Activated Carbon
6.2.2 Package shipments. Paper-bag packages used in shipments of GAC in less than railcar/truckload lots shall be protected by an outer package of a resistant nature, to avoid tearing the bags. Complete protection from weather shall be provided for the individual packages or by the conveyance.
6.2.3 Tolerances. The net dry weight of the packages shall not deviate from the recorded weight by more than ±5 percent. Objections to the weight of the material received shall be based on a certified unit weight of not less than 10 percent of the packages shipped, which are selected at random from the entire shipment.
6.2.4 Bulk shipments. Bulk shipments of GAC shall be in clean railcars or trucks with tight closures to avoid loss and contamination of the material in transit. The interior of the railcars or trucks shall be clean and free from dirt, corrosion scale, and other sources of contamination. Shipments in open-top, hopper-bottom cars are acceptable only with adequate provisions for covering the material and keeping it contained and protected during shipment. The criteria for choosing a railcar or truck are the type of handling equipment and the unloading facilities at the destination. Caution is advised in unloading bulk containers because particle stratification may occur during shipment. If the entire bulk shipment is used to fill a single contactor or filter, no special precautions are required. Where the bulk shipment will be divided between or among contactors or filters, different bays should be used to fill the various units, or GAC additions should be rotated among various contactors or filters. In order to ensure accurate and comparable bids from suppliers, the purchaser should adequately describe the GAC receiving structures (pressure vessels, gravity contactors, etc.) and conveyance measures that exist onsite and that are available for the suppliers’ use during delivery. Purchaser should also itemize equipment that should be provided by the GAC supplier and its subcontractors, such as type of delivery (bulk truckload, sacks, etc.), eductor system, amount of hose or pipe that is needed, types of hose connections necessary to connect with the utility’s existing conveyance system (if any), types of hose connections necessary to connect to the conveyance water supply, available pressure and flow of the conveyance water supply, any other necessary accommodations, allowable hours of work, and so forth.AWWA B604 pdf download.