CSA Z662 03 PDF
Status: Alert Withdrawn. Norwegian title: Oil and Gas Pipeline Systems and Commentary on CSA Standard Z, Oil and Gas Pipeline Systems. English title. CSA Special Publication Z Commentary on CSA Standard Z, Oil and Gas Pipeline Systems Published in June by Canadian Standards. Hyperlinks from the Z Standard to the corresponding clauses in the Z and. Special Publication. Z Commentary on CSA Standard.
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CAN/CSA-Z | Standards Council of Canada – Conseil canadien des normes
As shown in Figure 4. If such inspection confirms that the pipe is continuous welded or equivalent lap welded or furnace butt weldedthen additional restrictions on design pressure see Clause 4.
The design wall thickness t is based upon pressure containment capability, whereas the nominal wall thickness of the pipe to cza used is based upon pressure containment considerations and the allowances detailed in Clause 4.
In addition to the foregoing, for any welds where proven notch toughness properties are specified by the company, requalification is required if the thickness is decreased to a value less than This PEI document provides a concise compilation of recommended practices and procedures related to the installation of underground storage systems, including the topics of excavating, backfilling, supports and anchors, spill containment and overfill protection, secondary containment, release detection piping, cathodic protection systems, and testing.
Such limitations, if any, are stated elsewhere in the Standard. Notes to tables and figures are considered part of the tables and figures and may be written as requirements.
CSA Z662-03 and Z662.1-03
NOK 5 ,00 excl. The cluster concept was removed from the Standard in because of difficulties in definition and inconsistencies in 003. A note has been added to address temperature derating options specific to flanges. Then the cea requirements in Items a to f are to be considered.
In previous editions of the Standard, this wall thickness table addressed only gas pipeline systems. Figure 8 illustrates the effect of such features on a section of pipeline that would be in a Class 1 location based upon dwelling unit density.
Depending on interpretation, this clause enabled the designer to limit the extent of Class 2 and Class 3 locations to m beyond the last dwelling unit in the cluster. For any piping welds, other than partial-penetration butt welds, that are in accordance with any of the limitations stated in Items d i to d vthe company has the option of electing to use the requirements of a Clause 7; or b the ASME Boiler and Pressure Vessel Code, Section IX, for the establishment and qualification of welding procedure specifications and welders; ASME B Each study resulted in the derivation of a June 51 Z In the late s, it was recognized that it was important to control collectively the voltage, amperage, and travel speed, by using the concept of heat input as derived using the formula in Table 7.
Inthis definition was revised, with the deletion of the 1.
An anomalous result can be obtained, whereby an increase in dwelling unit density in an area containing four- or more storeyed buildings intended for human occupancy does not necessarily dictate a Class 4 location designation; however, it is common practice for the pipeline designer to assign a Class 4 location designation to any area that 003 buildings that are intended for human occupancy and have more than three storeys, rather than trying to decide whether or not such buildings are prevalent or will be prevalent after future development in the area.
Specific requirements to address partial-penetration welds were first included in the Standard in The class location length that is influenced by such institutions is the individual length of the institution plus m m on each endon an institutionby-institution basis. The exception allowed by Clause 5. Further limitations on maximum permissible offset at the weld root are found in Figure 7.
Inthe explanation of the meaning of the term was deleted from the Standard in order to make the term more general. Accordingly, a number of requirements in CSA Z The note to this clause concerns June 35 Z Unipolar operation can result in pipeline corrosion and in the accumulation of charge similar to strong static electricity on aboveground piping that is insulated from the csz, a case that would exist during pipeline construction.
Z Commentary on CSA Standard Z
There is no strict guidelines or consensus on the determination of interpass temperature, although typically it involves measuring the base metal temperature immediately adjacent to the weld joint within a short period of time after the weld bead has been deposited.
For the branch pipe: Ina change June 53 Z A case in point is the requirement to use piping that has proven notch toughness properties; the requirements in the Standard have been modified and generally made more stringent through the years, primarily to provide improved safety, but also to reflect technological improvements that have been made in the manufacturing processes used for pipe and components.
Consequently, the stresses at the crack tip that promote fracture propagation are rapidly diminished, and long propagating fractures do not occur.
This API document provides a compilation of best practices, based on current industry experience, knowledge, information, and management practices. These additional requirements only apply to materials having a specified minimum yield strength higher than MPa 56 psi because it is recognized that the carbon equivalent value may not be readily known for materials having a specified minimum yield strength of MPa or less.
A change from horizontal welding to vertical welding is an essential change; however, a change from vertical welding to horizontal welding is not an essential change. Read more about subscriptions. Drains are maintained widened or deepened on a regular basis, and therefore there is a higher risk of thirdparty damage. Class 2 locations included areas where the degree of development was intermediate between Class l and Class 3 locations, fringe areas around cities and towns, and farm or industrial areas where the one-mile density index exceeded 20 or the ten-mile density index exceeded All of the sketches depict the joining of items where the thicknesses are unequal because the two items have unequal specified minimum yield strengths and hence unequal design thicknesses ; however, Note 1 f covers the specific unequal thickness case for which the specified minimum yield strengths are equal and hence the design thicknesses are equal.
In Item bthe grade of the base material is to be specified in order to establish the basis for the tensile strength requirements in Clause 7.
Design requirements can be readily changed; however, the mechanical properties of inservice piping cannot. Welding Journal, June Bipolar installations do not affect the operation of pipelines, unless the power line is not functioning properly.