Pipeline instrument flow chart equipment graphic symbols HG20559.2-93 Compiled by: Process System Design Technology Center of the Ministry of Chemical Industry Approved by: Chemical Implementation date: November 1, 1994 Example Zhongpantian ()Laijing Yixingxin Device Hot foot Device Change cold steambzxZ.net Science's group energy Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.