NSF/ANSI 41 – 2016 pdf free download

NSF/ANSI 41 – 2016 pdf free download.Wastewater T echnology – Non-liquid saturated treatment systems.
1 General 1.1 Purpose The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for non-liquid saturated treatment systems. It is intended to protect public health and the environment as well as minimize nuisance factors. This Standard also specifies the minimum literature that manufacturers shall supply to authorized representatives and owners. 1.2 Scope This Standard contains minimum requirements for treatment systems that do not utilize a liquid saturated media as a primary means of storing or treating human excreta or human excreta mixed with other organic household materials. It addresses treatment systems that treat both solid and liquid waste, as well as those that only treat solid waste. Management methods for the end products of these systems are not addressed by this Standard. System components covered under other NSF or NSF/ANSI standards or criteria shall also comply with the requirements contained in those other standards. This Standard shall in no way restrict new system designs, provided such designs meet the minimum specifications described herein. 1.3 Systems classification For the purpose of this Standard, systems are classified according to the use environment for which they are intended to be installed. The systems classifications identified in this Standard are residential systems, day- use park systems, and cottage systems. Performance testing and evaluation requirements for each of these systems classifications are described herein.
3 Definitions 3.1 authorized representative: An organization, group, individual, or other entity that is authorized by the manufacturer to distribute, sell, install, or service non-liquid saturated treatment systems. 3.2 components: All of the physical, mechanical, and electrical parts that comprise non-liquid saturated treatment systems. 3.3 design rated capacity (DRC): The product of the population rating and the population equivalent. This number is reported separately for both urine and feces. 3.4 end products: The solid and liquid outputs, which represent treated human excreta or treated food wastes or both, from a non-liquid saturated treatment system. Bulking agents, bedding materials, and nondegradable waste materials are not considered end products in this Standard. . 3.5 manufacturer: The entity that develops, designs, and produces non-liquid saturated treatment systems. 3.6 population equivalent (p.e.): The average number of excrement events produced by an average adult person in one 24-hour period. For this Standard, 1 p.e. is defined as 1.2 fecal events and 4 urine events per person per day. 3.7 population rating: 1) For day-use park systems, it is the total number of uses or the combination of the daily total of urine and fecal events a system is designed to handle in a 24-hour period. 2) For residential and cottage systems, it is the maximum number of people the system is designed to service in a 24-hour period, without regard to the number of fecal events or the number of urine events. 3.8 specialized tools: Tools that are not readily obtained from a hardware store or general retail stores.
4.2 Exposed surfaces Exposed surfaces shall show no visible signs of structural change following performance testing and evaluation including, but not limited to, flaking or pitting of exposed surfaces or the formation of structurally significant cracks. NOTE – Small surface cracks exhibited by concrete tanks are normally expected in some circumstances and shall not be considered structural deterioration. 4.3 Maintenance tools Systems shall be supplied with all of the specialized tools required for emptying and maintaining the normal operation of the system. 4.4 Dissimilar metals Dissimilar metal materials, considered noncompatible at the electromotive level, shall not be in direct contact with each other. An electrically nonconductive insulating ftting shall be provided at the junction between such dissimilar metal parts or components. 4.5 Impact resistance Containers used for treatment or storage shall not break, display structurally significant cracks, or, other than cosmetic damage, display visible signs of permanent deformation when tested in accordance with 4.5.1 and 4.5.2. All impact resistance testing shall be conducted at 23土2。C(73+3.5 °F). 4.5.1 Impact test for horizontal surfaces of containers A 38 mm (1.5 in) diameter steel ball weighing 0.225 kg (0.5 Ib) shall be dropped from a height of 600 mm (24 in) to strike all horizontal and subhorizontal surfaces of all treatment and storage containers.6