前言:这是CSA/ANSI B149的第二版。6、沼气、填埋气、沼气产生和利用规范。它取代了2015年出版的前一版。本版本的主要变化包括:对范围进行了修订，以澄清代码覆盖范围和除外条款。增加了几个定义，例如合格人员、泄压装置、安全位置（用于气体排放）和阀门验证系统（VPS）。澄清了几个定义，例如沼气（去除加热内容参考）、危险区域（与适用代码协调）、污泥储存罐、独立膜储气罐、罐式膜储气罐和试烧（燃烧阀）。风机真空侧主入口阀上游垃圾填埋场的安装不符合本规范的要求。 允许使用柔性金属软管将管道连接到其他设备。从规范中删除了设备阀系上游的锁定正关闭压力调节器的要求。已取消了设计用于在100 kPag（14.5 psig）以上压力下储存气体的储气容器上安全阀上游的阻火器要求。危险区域的示例已扩展到包括气味控制、设备、组件、开放式气体压缩机或鼓风机。要求配备经ANSI Z21认证的自动安全切断阀。代码中增加了21/CSA 6.5，并标记了C/I，用于切断未配备安全切断阀的废气燃烧器的填埋气供应。填埋管坡度百分比已从规范中删除。对沼气装置用膜式储气罐的试验方法进行了修改。 附件中的一些修订包括对压力试验点（第D.2.8条）、手动截止阀（第D.2.11.1条）和阀门验证系统（第D.2.16条）的修订要求，阐明了可能不需要试验点火阀（第D.2.11.9条）或止回阀（第D.3.4条）时的要求，本规范是根据加拿大标准委员会对加拿大国家标准的要求制定的。CSA集团已将其作为加拿大国家标准发布。本规范已被美国国家标准协会（ANSI）批准为美国国家标准。范围:1.1概述1。1.1本规范适用于新建污水处理厂沼气生产、处理、储存和利用系统的安装，以及现有系统的新增和升级。 1.1.2本规范适用于新建填埋气系统中填埋气生产、处理和利用系统的安装，以及现有系统和临时系统的添加和升级。1.1.3本规范不适用于鼓风机真空侧主入口阀上游填埋场的任何基础设施。1.1.4本规范适用于新建沼气系统中沼气生产、处理、储存和利用系统的安装，以及现有系统的新增和升级。1.1.5本规范适用于沼气池系统、填埋气系统或沼气系统中所用管道的最大工作压力不超过860 kPag（125 psig）的室外安装管道或450 kPag（65 psig）的室内安装管道的管道系统。 1.1.6本规范适用于废水处理厂沼气或填埋场填埋气或沼气系统沼气处理、储存和利用的操作和维护安全方面。注:本规范不适用于沼气系统中的基质储存、长期沼气储存或中试规模和研究沼气池。1.1.7本规范适用于具有管辖权的当局认为存在危险或潜在危险的现有沼气和填埋气系统。1.1.8在第1.1.1条至第1.1.6条的范围内，可能存在本规范未涵盖的规定，在这种情况下，具有管辖权的机构的适用规定适用。1.1.9本规范不包括可再生天然气。1.2总结附录G给出了本规范的逐条总结。 1.3本规范中的术语“应”用于表示要求，即用户为遵守本规范而有义务满足的规定；“应该”用于表示建议或建议但不需要的建议；“may”用于表示一个选项或在本规范范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。1.4双重尺寸以国际单位制给出的数值为本标准的记录单位。 括号中给出的值仅供参考和比较。

Preface:This is the second edition of CSA/ANSI B149.6,Code for digester gas, landfill gas, and biogas generation and utilization. It supersedes the previous edition published in 2015.The major changes to this edition include the following:The Scope was amended to clarify code coverage and exclusions.Several definitions were added, e.g., qualified personnel, relief device, safe location (for venting of gas), and valve proving system (VPS).Several definitions were clarified, e.g., biogas (removed the heating content reference), hazardous area (harmonized with applicable codes), sludge holding tank, stand-alone membrane gasholder, tank-mounted membrane gasholders, and test firing (firing valve).Compliance with the requirements of this Code for the installation at landfills upstream of the main inlet valve on the vacuum side of the blower has been removed from the scope of this Code.Flexible metallic hose was allowed to be used to connect piping to other than appliances.The requirement for a lock-up positive shut-off pressure regulator upstream of an appliance valve train was removed from Code.The requirement for a flame arrester upstream of the relief valve on a gas storage container that is designed to store gas at a pressure above 100 kPag (14.5 psig) has been removed.Examples for hazardous area were expanded to include odour control, equipment, components open-type gas compressors, or blowers.Requirement of having an automatic safety shut-off valve certified to ANSI Z21.21/CSA 6.5 and marked C/I to shut-off the landfill gas supply to a waste gas burner that is not equipped with safety shut-off valve(s) was added to the Code.Landfill pipe slope percentage was removed from the Code.Testing method for membrane gasholders used in biogas installation has been modified.Some of the revisions in Annexes include revised requirements for pressure test point (Clause D.2.8), manual shutoff valves (Clause D.2.11.1), and valve proving system (Clause D.2.16), clarified requirements when a test firing valve (Clause D.2.11.9) or a check valve (Clause D.3.4) might not be required, etc.This Code has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.This Code has been approved by the American National Standards Institute (ANSI) as an American National Standard.Scope:1.1 General1.1.1This Code applies to the installation of systems for the production, handling, storage, and utilization of digester gas in newly constructed wastewater treatment plants, as well as additions to and upgrading of existing systems.1.1.2This Code applies to the installation of systems for the production, handling, and utilization of landfill gas in newly constructed landfill gas systems, as well as additions to and upgrading of existing systems and temporary systems.1.1.3This Code does not apply to any infrastructure of a landfill upstream of the main inlet valve on the vacuum side of the blower.1.1.4This Code applies to the installation of systems for the production, handling, storage, and utilization of biogas in newly constructed biogas systems, as well as additions to and upgrading of existing systems.1.1.5This Code applies to piping systems in which the maximum operating pressures for piping used in digester systems, landfill gas systems, or biogas systems do not exceed 860 kPag (125 psig) for piping installed outdoors or 450 kPag (65 psig) for piping installed indoors.1.1.6This Code applies to the safety aspects of the operation and maintenance for handling, storage, and utilization of digester gas in wastewater treatment plants or landfill gas at landfill sites or biogas in biogas systems.Note:This Code does not apply to substrate storage, long-term digestate storage, or pilot scale and research digesters in biogas systems.1.1.7This Code applies to existing digester gas and landfill gas systems where, in the opinion of the authority having jurisdiction, a hazard or potential hazard exists.1.1.8Within the scope of Clauses 1.1.1 to 1.1.6, there might be provisions not covered in this Code, in which case the applicable provisions of the authority having jurisdiction are to apply.1.1.9Renewable natural gas is excluded from this Code.1.2 SummaryAnnex G gives a clause-by-clause summary of this Code.1.3 TerminologyIn this Code, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Code. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.1.4 Dual dimensionsThe values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.