Dead LegDead legs will be measured by the term L/D, where L is the leg extension from the I.D.（应该理解为interior diameter） wall normal to the flow pattern or direction, and D is the I.D. of the extension or leg of a tubing fitting or the nominal dimension of a valve or instrument. For valves, L shall be measured to the seal point of the valve. If a branch from a primary pipeline has demonstrated flow during cleaning and SIP, it does not constitute a dead leg. （这句话是否理解为，如果主管中的一条支管在清洗或者SIP中有液体流，那么这个支管不被仍为是死角或者盲管）
For high purity water systems, an L/D of 2 or less is attainable with today’s manufacturing and design technology. For other bioprocessing systems, such as purification, filtration, and fermentation having cluster, block, and multi-port valves, an L/D of 2 or less is achievable. However, it may not be achievable with certain equipment and process configurations as they are currently manufactured. For this part, an L/D of 2 or less shall be considered a target ratio, and shall not be construed to be an absolute requirement. （就是说这个 L/D of 2 or less是一个目标比例，不是一个绝对要求） Publication Source: American Society of Mechanical Engineers (ASME), Bioprocessing Equipment (BPE) - 2012 Revision
Publication Date: 2012 - See more at: http://www.ispe.org/glossary?term=Dead+Leg#sthash.Kan09DXu.dpuf
上文选自ASME
所以个人认为这个primary pipeline的厚度是应该包括在里面的,同时看ASME的下面图示也是包含在内的呢！
| 
[复制链接]
|手机版|蒲公英|ouryao|蒲公英
( 京ICP备14042168号-1 ) 增值电信业务经营许可证编号：京B2-20243455 互联网药品信息服务资格证书编号：(京)-非经营性-2024-0033
发表于 2012-12-20 09:24:41
