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Cargo overpressure: relievingthe pain of compliance

机译:货物超压:减轻合规的痛苦

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摘要

First introduced in 1998, SOLAS 11-2/59.1 and subsequent updates forced ship owners and operators to upgrade their safety systems to secure cargo tanks against the risk of overpressure. New guidance issued by the IMO (IACS Ul SC 140) due to take effect in July 2013 has left many facing the prospect of yet more costs to ensure their vessels continue to conform. The regulations apply to all vessels transporting flammable cargoes or that are fitted with an inert gas blanket system as part of a fire prevention system, typically crude oil, fuel and chemical cargo tankers. Cargo overpressure is a serious complication which can occur in port as well as in transit. The greatest risk occurs during cargo transfer, a process which can take up to 24h for larger tankers, as cargo tank levels change, affecting the head space above the liquid. During loading, compression of the air in the tank can cause pressures to rise unless vented to the atmosphere. At the other end of the scale, falling liquid levels during unloading may create a vacuum unless air is admitted from the external atmosphere to balance the pressure.
机译:SOLAS 11-2 / 59.1于1998年首次发布,随后的更新迫使船东和运营人升级其安全系统,以确保货油舱免受超压风险。 IMO发布的新指南(IACS UL SC 140)将于2013年7月生效,这使许多人面临确保其船只继续合规的更高成本的前景。该法规适用于所有运输易燃货物的船舶,或装有惰性气体覆盖层系统作为防火系统一部分的船舶,通常是原油,燃料和化学货船。货物超压是一种严重的并发症,可能会在港口以及在运输过程中发生。最大的风险发生在货物运输过程中,对于较大的油轮,此过程可能会长达24小时,因为液货舱的高度会发生变化,从而影响液体上方的顶部空间。在装载过程中,除非将其排放到大气中,否则油箱中的空气压缩会导致压力升高。在秤的另一端,除非在外部大气中进入空气以平衡压力,否则在卸载过程中下降的液位可能会产生真空。

著录项

  • 来源
    《The Motor Ship》 |2013年第6期|19-20|共2页
  • 作者

    Stephen Ratcliffe;

  • 作者单位
  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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