挽救，再制造和修复的控制阀的完整性

Depending on equipment age, repair history, application severity and other factors, salvaged/refurbished (aka “remanufactured”) or repaired control valves may no longer meet a manufacturer’s original specifications as designed in accordance with the ANSI/ASME B16.34 control valve standard, “Valves – Flanged, Threaded, and Welding End”.(1)

这是目前为控制阀编写的唯一可用的ANSI/ASME标准；但是，其范围覆盖了“新”阀。Thus, in the absence of a Standard for “used” control valves (i.e. to include salvaged/refurbished, remanufactured, or repaired) the issue of ensuring sustained integrity, through valve refurbishment to the manufacturer’s design specifications as developed in accordance with the ASME standard, may be overlooked.

通常通过视觉检查和纠正措施来确认因严重服务应用而造成的控制阀破坏（假设此类维修操作适当地将阀门恢复到本文其余部分所涵盖的原始设计规格和尺寸）。但是，在许多过程应用中，对控制阀表面或厚度的逐渐降解可能无法明显可见，可能会导致潜在的完整性故障（损失），并带有潜在的伤害或财产损坏。

因此，请回答“二手”设备的问题，例如打捞，再制造或修复的控制阀：

• “When new chemical plant and refinery projects require adherence to a control valve design standard such as ASME B16.34 to better ensure plant design safety and address regulatory requirements, then why wouldn’t periodic inspection with adherence to the same standard be required during the operational life of a control valve?
• 流程行业是否需要检查，验证和经过认证的控制阀设计参数的文档，这对于完整性和满足管道系统压力类至关重要，特别是包括身体壁厚的认证？

已经制定了标准来解决这些类型的问题，以修复和翻新“二手”压力容器。控制阀不是这种情况。但是，有一些方法可以帮助上游和下游流程行业最终用户管理其控制阀：

• 降低与遏制损失相关的风险
• 解决PSM标准（2）和RMP规则（3）的机械完整性元素
• 同时提高可靠性和正常运行时间
• 通过使用供应商功能来最大程度地减少内部资源需求