How are pipe grades distinguished? ?

Pressure rating, as per ANSI standards: A--150LB, B--300LB, C--400LB, D--600LB, E--900LB, F--1500LB, G--2500LB. Material classification: A--cast iron, B--carbon steel, C--ordinary low-alloy steel, D--alloy steel, E--stainless steel, F--non-ferrous metals, G--non-metals

There should be instructions on the homepage image!

I found this information online; I hope it will be helpful. The classification of pipes should take into account the process conditions. Generally, a pipe’s classification consists of three parts; for example, a common designation is A1A, where the first digit represents the nominal pressure of the pipe flange； The second represents the process medium ； The third represents the material of the pipeline. There are many specific regulations; you can find out by referring to the standards. The \"20519.38-1992 Table of Pipe Grades and Pipe Material Grades\" and the \"Handbook for the Design of Process Pipes in the Petrochemical Industry\" provide relevant information. It seems that the codes for pipe grades vary from one organization to another, but it’s certain that each project has its own rules regarding pipe grades. These rules specify the materials and wall thicknesses of pipes and fittings, as well as the types and connection specifications of valves and flanges, and the materials used for fasteners, all depending on the different media and operating conditions. New employees are generally not assigned to prepare pipeline grade tables, so if you haven’t understood it yet, don’t worry – the company won’t assign this task to you. When you gain more experience and become more familiar with the various industry standards, you’ll naturally understand it. Currently, there are no unified regulations in China regarding the format and numbering method of grade tables; it is necessary to refer to the* practices and internal rules of one’s own organization. First, the grade number must be determined based on your operating pressure, temperature, and medium. Each organization has its own rules for assigning grade numbers, and these rules should be followed ； The pipe diameter range, standards, material, and wall thickness grades are determined based on the operational conditions and process requirements, as well as the standards for associated flanges and gaskets, along with the specifications for sealing surfaces and materials ； Determine the standards, materials, and wall thickness grades of the piping components to be used based on the process flow diagram ； Determine the model of various valves, the material of the valve cores, the material of the valve bodies, and the type of flange sealing surface based on the process flow diagram ； Determine the model, material, and standard of the special fittings to be used based on the process flow diagram. It is also necessary to determine the corrosion allowance, coloring standards, acceptance inspection specifications, as well as the inspection methods and standards for welds, based on the characteristics of the manufacturing process. After confirming the above information, fill out the form as required; the format of the form should follow the requirements of your own organization. The completed grading table must be submitted to the departments in charge of processes and materials for proofreading and review, to determine whether it meets the process requirements. The grade table is one of the main bases for pipeline design; it must be prepared with care and seriousness, and the same applies to any modifications to it, which require approval from the process and materials engineering teams. This post was last edited by dongping001 on 2009-3-3 12:19.]

1.0.1 The pipe grade number consists of the following three components: A, 1, and A. The third component indicates the category of the pipe material; the second component represents the sequence number; the first component denotes the nominal pressure of the pipe. 1.0.2 First component: The nominal pressure (in MPa) of the pipe, expressed as an uppercase English letter. A–K are used for the pressure grade codes according to ANSI standards (where I and J are not used), while L–Z are used for the pressure grade codes according to domestic standards (where O and X are not used). Well one ‘ 5oL B { two*,. One-one IB one“. . Bigan) EzxfA NSI9 4 }C- 400LB} LU - 6 00 L B r E- gooLB F- 1500LB G- 2500LB Pressure rating— ~— For domestic standards. 1.0.3 The second unit is a serial number, expressed in Arabic numerals starting from 1. 1.0.4 The third unit: the type of pipe material, indicated by capital English letters. 202 1.0.3 The second field is the sequence number, expressed in Arabic numerals starting from 1. 1.0.4 The third field: pipeline material category, represented by uppercase English letters. 202 A – Cast iron; B – Carbon steel; C – Ordinary low-alloy steel; D – Alloy steel; E – Stainless steel; F – Non-ferrous metals; G – Non-metals; H – Linings and internal anti-corrosion treatments

Generally, the first page will have a legend and explanations for the symbols.

It is usually indicated in the image on the homepage; if not, you can check the design specifications, as the information might be there.

**There are regulations regarding the depth of chemical engineering design

**There are regulations regarding the depth of chemical engineering design

Different design firms have their own regulations, and relevant explanations are necessary to understand them. If there is no specification regarding the pipeline grade, the design institute can be requested to issue it additionally.

Generally, when designing, a specific pipeline grade specification will be provided to you