Calculation of wall pressure bearing capacity of seamless steel pipe

3 125

 
For seamless steel tubes, the outer diameter and wall thickness are known, and it is required to calculate how much pressure it can withstand; or the known outer diameter
 
And pressure, it is required to calculate its economical wall thickness. In the above two situations, our designers are at work.
 
Often encountered, here, to provide you with a formula:
 
Set the tensile strength of the material to σ, the pressure to P, and the outer diameter of the tube D;
 
Pipe wall thickness δ=( P*D )/(2* σ/S)
 
Where S is the safety factor;
 
The pressure P is less than 7MPa , S=8 ; P is 7 to 17.5MPa , S=6 ; P is greater than 17.5MPa , S=4 ;
 
For example: See φ16*3 seamless steel pipe (20# steel), how much pressure can it withstand?
 
seamless steel pipe
 
Our first step is to choose the safety factor.
 
S=6; the tensile strength of 20# steel is 410MPa;
 
 
 
Φ 16*3 Seamless steel tube withstand pressure:
 
P= (2* σ /S* )δ/D
 
=(2*410/6*3)/16
 
 
 
=25.6MPa
 
--------- This value > 17.5MPa
 
 
 
Therefore, the safety factor is taken for the second time S=4
 
Φ 16*3 Seamless steel tube withstand pressure:
 
P= (2* σ /S* )δ/D
 
=(2*410/4*3)/16
 
=38.4MPa
 
 
 
The real case of our design
 
:
 
 
 
1. For a project, the GL heater mixed water pipe adopts φ76*4 seamless steel pipe (20# steel):
 
 
 
Our first step is to choose the safety factor
 
S=6; the tensile strength of 20# steel is 410MPa;
 
 
 
The pressure that the steel tube can withstand P= (2* σ/S* δ)/D
 
=(2*410/6*4)/76
 
 
 
=7.2MPa
 
(This value is between 7 and 17.5 MPa)
 
 
 
Conclusion: φ 76*4 seamless steel tube can withstand the project
 
2.2MPa steam pressure, don't worry.
 
 
 
2. For the same project mentioned above, the GL heater heat exchange tube is initially selected as φ 18*2.5 seamless steel tube, which is not used.
 
Usually used φ18*2 seamless steel pipe (20# steel), then, φ18*2 seamless steel pipe can withstand 2.2MPa
 
What about steam pressure?
 
 
Our first step is to choose the safety factor.
 
S=8; the tensile strength of 20# steel is 410MPa;
 
 
 
The pressure that the steel tube can withstand P= (2* σ/S* δ)/D
 
=(2*410/8*2)/18
 
 
 
=11.4MPa
 
-------- This value > 7MPa
 
 
 
Therefore, the safety factor is taken for the second time S=6
 
The pressure that the steel tube can withstand P= (2* σ/S* δ)/D
 
 
 
 
 
 
=(2*410/6*2)/18
 
=15.2MPa
 
It can be seen that φ 18*2 seamless steel pipe can be pressed
 
 
 
 
 
15.2MPa, the steam pressure in the project is
 
 
 
2.2MPa, for this condition, it is not necessary to use φ 18*2.5 (the wall thickness is increased, the pressure bearing capacity will be higher).
 
.

Related post

3 Comments

  1. Abrasion resistant pipe
    Abrasion resistant pipe 1331088601 -  Reply / Edit

    Abrasion resistant pipe,Abrasion resistant tube applied in coal-fired power plant ash and slag discharge tube, powder, powder tube, desulfurization pipeline,in addition also widely used in the following industries: Mining coal industry, coal.

  1. SCH80 seamless pipe
    SCH80 seamless pipe 1331296492 -  Reply / Edit

    API SCH 80 seamless pipe 1) standard: ASTM, JIS, DIN, GB, API 2) Grade:ASTM A106 /A53, API 5L.

  1. EFW Steel pipe
    EFW Steel pipe 1332644974 -  Reply / Edit

    EFW Steel pipe,Standard: ASME,ASTM,JIS,DIN,BS,EN,2.Steel grade:Q195,Q235,Q345,ASTM A106 GRB,A53 GRB.

  1. Boiler tube,Boiler pipe
    Boiler tube,Boiler pipe 1331085996 -  Reply / Edit

    Boiler tube is one of the seamless steel pipes. The method of manufacturing is same to seamless pipe,but this pipe has an requirement of the steel grades.Depending on the operating temperature,it can be divided into two kinds: general boile.

  1. SMLS steel pipe
    SMLS steel pipe 1331297458 -  Reply / Edit

    SMLS steel pipe,Seamless steel pipe,API ASTM DIN SEAMLESS STEEL PIPE 2. WALL THICKNESS SCH10 TO SCH160 .

  1. seamless steel tube
    seamless steel tube 1331297854 -  Reply / Edit

    seamless steel tube,seamless steel pipe,API ASTM DIN SEAMLESS STEEL PIPE .WALL THICKNESS SCH10 TO SCH160.our company obtained the certificate of ISO9001 Quality System Authentification, and it started to control the quality in accordance wit.

Latest Comments

  • p11 alloy steel pipe
    p11 alloy steel pipe

    Thebiggest advantage ofp11alloy steel pipeis that it can be 100% recycled. It conforms to the national strategy of environmental protection, energy saving and resource conservation. The national policy encourages the expansion of high press.

  • How long is the life of a spiral steel pipe ?
    How long is the life of a spiral steel pipe ?

    Spiral steel pipe itself has no life limit, and the service life is mainly related to the operating environment and production process. Spiral steel pipe operating environment is relatively poor In order to extend the service life, the oute.

Get in touch

Our company covers an area of 80, 000 m2 with a total assets of 90 million Yuan. There are 360 staff members including 80 technicians in our company. .

We also establish an effective complete quality control system. In 2003, our company obtained the certificate of ISO9001 Quality System Authentification!