Is the pipe grade the design pressure of the pipe?

The pipe class generally corresponds to the nominal pressure of the flange used, and it does not represent the design pressure of the pipe; the design pressure of the pipe is usually lower than the pressure corresponding to its class.

The design pressure of a pipe is generally lower than the pressure corresponding to its pipe class. Less than?

It’s less, did I get confused? Old Wang, please hurry up and tell me about it

I don’t understand, that’s why I’m asking you. The design pressure of the pipeline is low; can it withstand the pressure corresponding to its pipeline grade?

This post was last edited by bfdlwolf on 2018-12-4 at 15:37. The correct term for “pipe grade” should be “pipe grade number,” which consists of three elements: 1. the nominal pressure of the pipe, 2. the sequence number, and 3. the category of the pipe material. Therefore, the design pressure of a pipe is generally lower than the pressure corresponding to its pipe grade number (the nominal pressure of the pipe)

Is there any formula relating the design pressure of a pipeline to its nominal pressure?

Lao Wang is so modest; take a look at the reply below your post: lol

6th floor? I think what they said makes sense; the design pressure of a pipe is generally less than the pressure corresponding to its pipe grade (the nominal pressure of the pipe). In other words, if the nominal pressure of a pipe is 1.6 MPa, its design pressure will not reach 1.6 MPa, so it’s fine – that’s how you should understand it, right?

SEI SEPM0101.1_Pipe Material Grade Specifications (Refining), version 2002, defines it as follows: Pipe material grade 2.1.1 The pipe material grade is determined based on the design temperature, design pressure, and requirements of the medium to be transported, as well as the performance and economic viability of the material. The materials, types, and specifications of pipes and pipe components shall be selected in accordance with this standard, based on the pipe material grades specified in the Process Piping and Instrumentation Diagram (PID). The design pressure listed in the pipeline material grade table refers to the maximum allowable design pressure at the design temperature; the actual design pressure must not exceed this value in order to use that grade. 2.1.2 The pipe material grade consists of three character units: a number indicating the flange pressure rating (MPa) // a letter representing the basic material code // a number indicating the pipe grade sequence for the same flange pressure rating and basic material. The pipe grade sequence reflects the variations in the specifications of pipes and their components due to differences in the applicable media and corrosion allowances. This serial number is listed in sequential Arabic numerals. 2.1.3 When connecting pipes of different material grades, unless there are isolation devices such as blind flanges, the valves at the connection points of the pipes of the lower grade shall be selected according to those of the higher grade, and the boundary between the material grades of the pipes shall be indicated.