泵.离心和旋转泵用轴密封系统

[中文适用范围]： 本国际标准规定了石油、天然气和化学工业中使用的离心泵和旋转泵的密封系统的要求并给出了建议。 它主要适用于危险、易燃和/或有毒的服务，这些服务需要更高程度的可靠性，以提高设备可用性并减少大气排放和生命周期密封成本。 它涵盖泵轴直径从 20 毫米（0.75 英寸）到 110 毫米（4.3 英寸）的密封件。 本标准也适用于密封备件，可供现有设备的升级改造参考。 提供了本国际标准涵盖的密封配置的分类系统，包括类别、类型、布置和方向。 [外文原描述]： ISO 21049:2004 specifies requirements and gives recommendations for sealing systems for centrifugal and rotary pumps used in the petroleum, natural gas and chemical industries. It is applicable mainly for hazardous, flammable and/or toxic services where a greater degree of reliability is required for the improvement of equipment availability and the reduction of both emissions to the atmosphere and life-cycle sealing costs. It covers seals for pump shaft diameters from 20 mm (0,75 in) to 110 mm (4,3 in). ISO 21049:2004 is also applicable to seal spare parts and can be referred to for the upgrading of existing equipment. A classification system for the seal configurations covered by ISO 21049:2004 into categories, types, arrangements and orientations is provided.