AWWA B112:2019 pdf download.Microfiltration and Ultrafiltration Membrane Systems
4.5.1.11 Backwash. Maximum backwash (BW) or other hydraulic flush requirements including frequency, duration, flow rates, pressures, and any other important conditions.
4.5.1.12 Chemically enhanced backwash (CEB). Including frequency (and any applicable performance triggers); duration; chemical concentrations; temperature; chemical exposure limits, including for temperature, pH, or other limitations; and any other important conditions for CEB or similar activities.
4.5.1.13 Maintenance wash (MW). Including frequency (and any applicable performance triggers); duration; chemical concentrations; temperature; chemical exposure limits, including for temperature, pH, or other limitations; and any other important conditions for MW or similar activities.
4.5.1.14 Clean-in-place (CIP). Including frequency (and any applicable performance triggers); duration; chemical concentrations; temperature; chemical exposure limits, including for temperature, pH, or other limitations; and any other important conditions for CIP or similar activities.
4.6.1 Materials of construction. The products and components of a membrane system shall be constructed of materials that are resistant to corrosion in the environment in which they are placed. Metals, fiberglass, ceramics, and plastics are acceptable materials of construction provided they can withstand the rigors of their internal and external environments.
4.6.2 Pressure ratings. The materials of construction must be suitable for pressures in excess of the greatest possible pressure each component may be exposed to after installation including a reasonable safety factor.
4.6.3 Temperature variations. Membrane systems may operate under temperature conditions other than ambient. Materials in such use shall be structurally appropriate for these temperature variations over the operating pressure range.
4.6.4 Toxicity levels. Products and components must not leach toxic substances into water that is distributed to the public or released to the environment. Disposal methods for residuals and used components that meet applicable regulatory requirements shall be available. Evaluation shall be accomplished in accordance with requirements that are no less restrictive than those listed in NSF/ANSI 60 or NSF/ANSI 61, respectively, if required by applicable regulatory agency and/ or required in the purchase documents. Certification shall be accomplished by a certification organization accredited by the American National Standards Institute.AWWA B112 pdf download.