Diagram No.:**-****-**
The first two **-**** for the equipment file number, of which ** is the unit of preparation of the equipment design document classification number, all of the chemical process equipment, machinery and other specialized equipment construction drawings and design documents are divided into 0-9 ten categories, each category is divided into 0-9 ten kinds of chemical commonly used in the three categories of documents:
1 class: container
2 class: heat transfer equipment
3 class: tower equipment
Equipment file number in the second item **** is the unit design document sequence number.
The last ** is the last number, it is the sequence number of the drawings.
(Category documents are too many to be labeled one by one, forgive me! 如确实需要请发邮件至yjmtd2258@sina.com,再给你发过去)