压缩空气的管道有材质要求吗？

生活不止眼前

压缩空气的主管为DN100碳钢管，经过三级过滤后，到用点经过DN65碳钢  DN50碳钢、 DN40（304不锈钢） 再到用点DN25（304不锈钢） 或DN20（304不锈钢） ，直接接触用点加终端过滤器，非直接接触用点为直接使用（气动阀门等），这种不同的材质是否可行。另外外层空调机房各分布一个用气点，用于冬天吹空调表冷器的水(防冻裂用)。

飞凌大圣

我们一般都是使用304不锈钢的，你具体可以学习下GB50029-2014。

yc20160802

现在一般做法是压缩机-不锈钢储罐-除湿-过滤-使用点。不锈钢储罐后面的管路阀门都用不锈钢（304或316）.

hthbfbf

没看懂      

山顶洞人

没什么问题，不过吹水那事，你不觉得浪费吗？

yongge1234

如果是洁净用气，过滤器到用气点的管道材质应为316或316L.

生活不止眼前

山顶洞人 发表于 2017-10-17 09:37
没什么问题，不过吹水那事，你不觉得浪费吗？

前期设计没我们的事，具体到验证这方面，我们小兵才会跟进，至于吹水这事领导们定的，呵呵。

terbiumcf

同问，在线等！

茶客

GB50029-2014第9.0.4条有详细规定。

生活不止眼前

刘辉宾 发表于 2017-10-17 09:45
前期设计没我们的事，具体到验证这方面，我们小兵才会跟进，至于吹水这事领导们定的，呵呵。

感谢您的回答

生活不止眼前

茶客 发表于 2017-10-17 10:15
GB50029-2014第9.0.4条有详细规定。

感谢您的回答，回头我认真看一下

wood295

应该是304吧 我认为

beiwei5du

碳钢可以在外边用，可能要注意一下，洁净区使用304不锈钢就可以了，但是如果针对于经常清洁消毒的区域（比如A，B级区域），根据情况，建议在洁净区使用316，主要考虑到的是管道外壁的腐蚀性。
5.7.6   Optional Materials
  Material selection is dependent on the risks the interaction between the gas and materials of construction of all components of the distribution system presents to the end user. Decision processes should be documented and checked.
5.7.6.1  Stainless Steel
  Stainless steel is usually used in production areas:
  •  ASTM 304 grade stainless steel may be adequate for non-sterile manufacturing areas, but there may be a risk of corrosion depending on the cleaning and sanitizing materials used.
  •  For sterile operations, ASTM 316 grade or equivalent is normally used, as the cleaning and sanitizing materials used are generally more corrosive.
  Valves and fittings should be specified to match the piping material. Sanitary jointing methods are not usually required, as there is slight risk of microbial growth within a dry system (see Section 6 of this Guide). Orbital welding may be specified to ensure consistent reliable welds, with a purge gas used to prevent oxide formation inside pipe work.
  It may be cost effective to specify lower grade stainless steel (e.g., ASTM 304) for distribution systems, with the benefit of a clean good quality internal finish, with a higher grade used in production areas where it will be subject to more corrosive cleaning agents.
  The quality of the stainless steel used for a system will depend on the end use. Suppliers/installers should be consulted to ensure the required cleanliness can be obtained and that the correct documentation is available to support the installation.
5.7.6.2  Medical Grade Copper
  Medical gas grade copper (e.g., ASTM B 280ISO n7396-1 part 4.3.6) BS EN13348, may be used in major installations (100 ft (30.5 m) of pipe or more). Material should be specified as clean and degreased, purged during fabrication, and jointed without flux using “hard” or silver solder . Joints to valves are usually by flange or soldered connections. For more information, see http://www.copper.org (Reference 35, Appendix 8). Refrigeration grade copper may be considered.
  Copper pipe may used for a distribution system, with a break at a service outlet panel, or a service void, with the final part of the pipe work in stainless steel within a production area. Copper pipe may not be recommended for use with nitrogen, as moisture in the gas may cause internal corrosion.
5.7.6.3  Plastics
  Modern thermoplastic (e.g., high density polyethylene) can be used for the clean distribution of gases. Thick walled High-Density Polyethylene (HDPE) pipe is available, suited to compressed gases up 160 psi (1 1 bar). HDPE systems can be quick to install, provide a corrosion free smooth internal bore and a clean external surface. The systems can be color coded to match codes for the gas being transported.
  Disadvantages of plastic pipe work include:
  •  Systems may require additional supports (compared to metal systems). Lines may be supported in a channel.
  •  The material may require additional expansion requirements over those required for a metal system.
  •  Ultra violet stability of the material for use in external applications should be checked.
  •  Plastic material cannot be used for a flammable or oxidizing gas:
  -  The plastic may not present such a high quality vapor barrier as metals.
  In some regions, e.g., the US Occupational Health and Safety Administration (OSHA) regulates against using brittle plastics for compressed air distribution systems.
  Plastic may be used for subsystems where pipe work is protected from mechanical damage, and the outlet valves are mechanically supported, so that there is no stress transmitted to the pipe work, e.g., an inert gas distribution system in a laboratory.
  Where pipe work is to be routed though a hazardous area, the melting point of the material should be considered along with the implication of a melted distribution line.
5.7.6.4  Aluminum
  Proprietary systems using aluminum pipe work may be limited in size and connected using plastic push in connectors. These systems should not be used for a flammable or oxidizing gas.
  Where pipe work is to be routed though a hazardous area, the melting point of the material should be considered along with the implication of a melted distribution line.
5.7.6.5  Carbon Steel
  Where a gas is kept at a low Relative Humidity (RH) (below 35%), risk of internal corrosion is minimal; therefore, steel is an option for use in a distribution system. If used, galvanized material is usually selected to provide a corrosion resistant external finish.
  Where galvanized material is used, the internal finish should be of good quality and clean, or it will require a long blow down period to clean up the system.
  Jointing has to be specified carefully, to ensure minimal risk of generating loose material or contaminating inside a pipe with hydrocarbon, e.g., welding with a purge gas, or screwed joints made using without lubricant/sealant, assembling the joint with non shedding material, such as PTFE tape.
For these reasons as well as the general appearance, carbon steel is not generally used.

happy1105

感谢分享，学习一下

13556636199

这要看你压缩空气使用点的要求，一般情况下都用304-316材质管道。

Dvencent

我们一般都是使用304不锈钢的，还要看你压缩空气使用点的要求
另外外层空调机房各分布一个用气点，用于冬天吹空调表冷器的水应该没啥毛病吧，冬季表冷器里的循环水我们都是放干净，防止冻裂的，这操作如有毛病请大神们指点一二，咱学习学习

lqthjm

谢谢楼主分享

FYR

学习一下
谢谢楼主分享

wdd1971

用304不锈钢好些。

藏律行

感谢分享，学习一下