UA-69298255-1 UA-69298255-2 CSA Z662 Pressure design for steel pipe — General

CSA Z662 Pressure design for steel pipe — General

June 17, 2020

4.3.5.1
     There is a commentary available for this Clause.
For straight pipe, the design pressure for a given design wall thickness or the design wall thickness for a given design pressure shall be determined by the following design formula:

P = (2St/D) X F X L X J X T
where

P =I design pressure, MPa

S =I specified minimum yield strength, as specified in the applicable pipe standard or specification,MPa. For pipe of unknown origin, see Clause 5.6.4

t =I design wall thickness, mm

D =I outside diameter of pipe, mm

F =I design factor (see Clause 4.3.6)

L =I location factor (see Clause 4.3.7)

J =I joint factor (see Clause 4.3.8). For pipe of unknown origin, see Clause 5.6.4

T =I temperature factor (see Clause 4.3.9)

Note: Calculated design pressures should be rounded to the nearest 10 kPa and calculated design wall thicknesses should be rounded to the nearest 0.1 mm.
4.3.5.2
     There is a commentary available for this Clause.
Where steel pipe is intended to be heated, the effects of the time-temperature relationship on the mechanical properties of the pipe shall be considered.
Note: Examples of post-manufacturing heating activities include fabrication, coating, and installation.
4.3.5.3
     There is a commentary available for this Clause.
The design pressure and design wall thickness for field bends made from steel pipe shall be in accordance with the requirements for straight steel pipe.
Note: Additional wall thickness might be necessary for factory-made bends.
4.3.5.4
     There is a commentary available for this Clause.
The design pressure for pipe made to a standard or specification other than CSA Z245.1, API 5L, ASTM A984/A984M, ASTM A1005/A1005M, or ASTM A1024/A1024M shall not exceed the pressure corresponding to 72% of the specified minimum yield strength of the pipe.

4.3.5.5
     There is a commentary available for this Clause.
Where standards or specifications refer to the specified minimum value of a mechanical property of a pipe, the actual value of such a property shall not be substituted in design calculations.
4.3.6 Pressure design for steel pipe — Design factor (F)
     There is a commentary available for this Clause.
The design factor (F) to be used in the design formula in Clause 4.3.5.1 shall be 0.800.
4.3.7 Pressure design for steel pipe — Location factor (L)
There is a commentary available for this Clause.
The location factor (L) to be used in the design formula in Clause 4.3.5.1 shall not exceed the applicable value given in Table 4.2.

 

 

 

 

 

 

 

 

 

Read More:

CSA Z662-15 (Oil and gas pipeline systems)

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