Pipeline pressure drop calculation
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I need everyone’s help with this; thank you in advance. In the process design of chemical pipelines, once the material for those pipelines is known, how can one calculate the pressure drop across the pipelines (including the fittings)? Thank you. I’d appreciate a more detailed explanation. Thank you
Please refer to the chemical piping manual, where the detailed calculation procedures are available. Due to space constraints, it is not possible to go into detail here.
You can look up the equivalent length of the pipe fittings.
Actually, the original poster didn’t clarify the purpose of the pipeline. If it is a pipeline for transporting compressed gases, there are quite a few steps involved in the precise calculation, such as those related to plug flow. . . So the problem needs to be described clearly first :)
The book \"Principles of Chemical Engineering\" mentions equivalent length.
The pressure drop of a pipeline is usually calculated in the following manner. Liquid: First, determine the pipe size and calculate the Reynolds number. Based on the pipe size and the roughness of its inner surface, the friction coefficient f can be found using a Monot chart (from the chapter on fluid flow in Principles of Chemical Engineering). The Reynolds number Re = diameter * flow velocity * fluid density / fluid viscosity. The pressure drop when a fluid flows through a straight pipe can be calculated using Darcy’s formula, as follows: For laminar flow (Re < 2000), the pressure drop = (0.5 * friction coefficient f * length of the pipe * density * square of the flow velocity) / square of the pipe diameter. For pipe fittings, the equivalent length L’ of all fittings in the pipe can be determined; when calculating the pressure drop, the length of the pipe in the formula above is equal to the sum of the length of the straight sections and the equivalent lengths of the fittings. This allows for the calculation of the theoretical pressure drop. If you still don’t understand, look up the principles of chemical engineering or ask the experts in your office.
It’s very detailed in terms of chemical engineering principles; go and find a book to read it
I wonder if the original poster is in the field of petrochemistry? If so, you can refer to Volume 1 of the \"Process Piping Installation Design Manual for Petrochemical Plants\", pages P20-30, which covers the calculation of pressure drop in pipelines for incompressible fluids. It’s difficult to describe the specific calculations here; I think the best approach is to provide you with some ideas, and it’s better to look up books on your own.
You can just check the materials you have. The simplest way is to read Chapter 1 of \"Principles of Chemical Engineering (Volume I)\\", where \"Fluid Flow\" is explained in detail
It can be based on \"Calculation of Pipeline Pressure Drop\" in HG/T 20570.7-95, which is part of the Technical Specifications for the Design of Process System Engineering (HG/T 20570-95); this industry standard also provides detailed descriptions of the equivalent lengths for certain valves and pipe fittings.