Instruction on how to calculate the pressure of steel pipes

Why do we need to calculate the pressure inside the pipe when constructing a pipeline system, an oil or gas pipeline? To answer this question, let's explore the post below with VHE to understand how to calculate the pressure inside cast steel pipes at minimum yield strength!

Most people, when buying steel pipes for installation, do not know how to do pressure calculations to choose the right type of pipe. Therefore, when calculating this value, we can know whether to choose a thick tube or not. Or choose a tube with a larger diameter.

Below is the pressure calculation formula derived from the scientific research work of mathematician Peter Barlow. This is the formula that has been recognized by many scientific councils around the world and is used in many places as a standard to determine material quality.

Formula to calculate the working pressure of steel pipes:

how to calculate the pressure of steel pipes


  • 1 Mpa = 1,000,000 Pa
  • 1 Mpa = 1,000 kPa
  • 1 MPa = 10 Bar
  • 1 Mpa = 1,000,000 N/m2
  • 1 MPa = 100 N/cm2
  • 1 Mpa = 1 N/mm2
  • 1 Mpa = 1,000 kN/m2
  • 1 Mpa = 0.1 kN/cm2
  • 1 Mpa = 0,001 Kn/cm2
  • 1 Mpa = 101,971.6213 kg/m2
  • 1 Mpa = 10.19716213 tons/cm2
  • 1 Mpa = 0.1019716213 kg/mm2
  • 1 Mpa = 101.9716213 tons/m2
  • 1 Mpa = 0.01017916213 tons/cm2
  • 1 Mpa = 0,0001017916213 tons/mm2
Steels Standard Equivalent steel grade Yield limit (σ0.2) (N/mm2) Application
CT3 ГOCT 380-71 CT38 TCVN 1765- 75 ≥ 210 - A common type of rolled steel, carburized
- Usually supplied hot rolled, in the Normalized state and without further heat treatment to increase durability
- Mainly used in construction structures and common machine parts
JIS G3101- 1987
C45 TCVN 1765- 75 45 ГOCT 1050- 74 ≥ 360 - It is a good quality structural steel and carbon steel
- Usually sugar is supplied in the form of rolled, threaded and semi-finished products
- Mainly used to make machine parts, very advanced for determining hot processing mode and part durability
S45C JIS G4051- 1979
1045 AISI ≥ 390
C55 TCVN 1765- 75 55 ГOCT 1050- 74
S55C JIS G4051- 1979
1055 AISI
C65 TCVN 1765- 75 65 ГOCT 1050- 74 ≥ 420
Inox 304 AISI 08Cr18Ni10 TCVN  ≥ 201 - Is a type of stainless steel belonging to the austenitic family, non-magnetic
- Commonly used in the chemical industry, food processing, medical equipment, etc.
304L AISI SUS 304L JIS ≥ 175
SUS 316
(Inox 316)
JIS     ≥ 205 - Is a type of stainless steel belonging to the austenitic family, non-magnetic
- Higher abrasion resistance than SUS304.
- Commonly used in the chemical industry, food processing, medical equipment, etc.


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