1. GENERAL 概述 1.1 Scope 范围
a.This Standard Specification covers the design of American Petroleum Institute (API) Standard 618, reciprocating compressors in hydrogen and hydrocarbon services.
本标准规范涉及美国石油学会（API）标准618，氢气和碳氢化合物系列往复式压缩机设计
b.Exceptions or variations shown in the UOP Project Specifications take precedence over requirements shown herein.
“UOP公司工程规范”中给出的例外情况或变更优先于本标准中的要求。 1.2 References 参考文献
Unless noted below, use the edition and addenda of each referenced document current on the date of this Standard Specification. When a referenced document incorporates another document, use the edition of that document required by the referenced document.
如果以下没有另外说明，使用本“标准规范”发行日期内有效的各参考文件版本和附录。如果参考文件引用另一文件，则使用参考文件要求的引用文件版本。
a.American Petroleum Institute (API) Standard 618, “Reciprocating Compressors for Petroleum, Chemical, and Gas Industry Services”
b.American Society of Mechanical Engineers (ASME) B16.5, “Pipe Flanges and Flanged Fittings, NPS ? Through NPS 24”
c.ASME B16.47, “Large Diameter Steel Flanges, NPS 26 Through NPS 60” d.ASME B46.1, “Surface Texture (Surface Roughness, Waviness, and Lay)”
e.European Forum for Reciprocating Compressors (EFRC), “Guidelines for Vibrations in Reciprocating Compressor Systems”, www.recip.org
f.National, state, and local governmental regulations and laws. a.API618标准 石油化工和天然气工业用往复式压缩机
b.美国机械工程师学会(ASME) B16.5，“管法兰和法兰管件，NPS1/2至NPS24公制/英制标准”。
c.ASME B16.47大直径管钢制法兰(NPS 26~NPS 60) d.ASME B46.1,表面特征(表面粗糙度、波纹度和花纹方向).
e.欧洲的往复式压缩机论坛(EFRC)，“往复式压缩机系统振动指南”，www.recip.org
f. 国家、州和地方政府法律和规定。 2.DESIGN 设计
This standard is intended to be used as an addendum to API Standard 618. Numbering in this document coincides with actual paragraph numbers from API Standard 618 5th edition.
本标准用作API标准618的补充。本章节中所采用的编号与API618 5th 版的实际段落编号相同。
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Flanges intended for use with spiral wound gaskets shall have a flange surface finish of 125 microinch Ra minimum to 250 microinch Ra maximum. Flanges intended for use with other gaskets shall have a flange surface finish within the optimal range for the specified gasket. Finishes shall be judged by visual comparison with surface finish roughness standards conforming to ASME B46.1.
用螺旋缠绕垫圈的法兰盘表面粗糙度应介于125微英寸到250微英寸之间。使用其他垫片的法兰盘的表面加工应符合垫片规范最佳值。
Flange finishes shall be protected from damage during fabrication, heat treatment, shipping, storage and installation.
法兰盘成品应使用符合ASME B46.1标准的表面粗糙度标准进行目视比较。 Ring Joint flanges shall have a flat bottom groove with the intersection between the bottom and sides of the groove machined to a smooth 0.125 inch (3mm) minimum radius.
槽式密封面法兰应该有一个平的底部沟槽，在凹槽的底部和侧面之间的光滑十字槽加工尺寸最小半径0.125英寸(3mm)。
6.9 Valves and Unloaders 气阀和卸荷器 Paragraph 6.9.2.6, Clarification 澄清
To prevent failure of the unloader to actuate due to corrosion: 为防止因腐蚀造成的卸荷器失效