Seamless pipe pressure calculation

A seamless pipe (SMLS pipe) is a metal pipe manufactured from a single piece of steel billet. The production process involves heating, perforation, rolling, and cooling. Unlike welded pipes, seamless pipes have smooth inner walls, uniform thickness, and can withstand high pressure and high temperatures. The manufacturing process ensures the high quality and reliability of seamless pipes.

Calculating the Pressure of Seamless Pipes

1. General Pressure Calculation

Under normal circumstances, the pressure capacity of seamless pipes can be calculated using the following formula: P=2S⋅tDP = \frac{2S \cdot t}{D}P=D2S⋅t

Where:

PPP is the pressure-bearing capacity of the seamless pipe (MPa)

SSS is the tensile strength of the seamless pipe (MPa)

ttt is the wall thickness of the pipe (mm)

DDD is the diameter of the pipe (mm)

In practical applications, this calculation needs to consider specific conditions, adjusting for factors such as the use environment and operating conditions.

2. High Temperature and High Pressure Calculation

When seamless pipes are used under high temperature and high pressure, the effects of temperature and pressure on the pipe material must be considered. The pressure calculation in such cases can be done using the following formula: P=2S⋅tD⋅(1−K)⋅CP = \frac{2S \cdot t}{D} \cdot (1-K) \cdot CP=D2S⋅t⋅(1−K)⋅C

Where:

KKK is the temperature coefficient

CCC is the pressure coefficient

The values of KKK and CCC depend on the specific materials and usage conditions of the seamless pipe.

Expression Method of Seamless Pipe Pressure Coefficient

For steel pipe pressure P<7P < 7P<7 MPa: Coefficient S=8S = 8S=8

For steel pipe pressure 7

For steel pipe pressure P>17.5P > 17.5P>17.5 MPa: Coefficient S=4S = 4S=4

By using these formulas and coefficients, the pressure capacity of seamless pipes can be accurately determined for various conditions.