请注意:此版本的所有临时修订版将在您购买时提供。UL船用贯穿船体配件和海上阀门安全标准，UL 1121适用范围这些要求包括拟在水线上方或下方使用的船用贯穿船体配件和用作关闭装置的船用贯穿船体阀门，以实现船体贯穿件的正向关闭。这些要求不包括使用切断装置作为建立或控制液体流速的手段。这些要求涵盖的海上贯穿船体配件和海旋塞的安装和使用要求包括在海旋塞、贯穿船体连接件和排水塞的推荐规程和标准ABYC H 27中，以及水线和舷侧线之间船体开口的安装和保护的推荐规程和标准ABYC H 15中。 与本标准中涉及的电气冲击、材料或部件的要求不同，应使用适当的附加组件和最终产品要求对人员受伤进行评估，以维持本标准最初预期的可接受安全水平。如果产品的特征、特性、组件、材料或系统与本标准的特定要求或规定相冲突，则无法判断其是否符合本标准。在认为合适的情况下，应根据本标准制定、修订和实施所采用的方法，提出并采用要求修订。

Please note: All interim revisions for this edition available at time of your purchase will be included.UL Standard for Safety for Marine Through-Hull Fittings and Sea-Valves,UL 1121ScopeThese requirements cover marine through hull fittings intended to be used above or below the water line and marine sea valves for use as shut off devices to effect positive closure of boat hull penetrations.These requirements do not cover the use of shut off devices as a means of establishing or controlling the flow rate of a liquid.Requirements for the installation and use of marine through-hull hull fittings and seacocks covered by these requirements are included in Recommended Practices and Standards Covering Seacocks, Through-hull Hull Connections, and Drain Plugs, ABYC H 27, and the Recommended Practices and Standards Covering Installation and Protection of Hull Openings Between Waterline and Sheer Line, ABYC H 15.A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard cannot be judged to comply with this standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.