Status: Alert Withdrawn.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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In Canada at that time, it was considered that this new requirement was unnecessary, and it was expected that it would eventually be rescinded in the applicable component standards. The requirement for the designer to consider designating areas as Class caa locations if they contain institutions where rapid evacuation may be difficult, such as hospitals or nursing homes, was introduced in ; however, such a designation should not be considered if the class location assessment area would otherwise be a Class 4 location.
June 69 Z The type and number of test specimens for diameters larger than Making the definition part of Table 5. The purpose of the Commentary is to provide background information concerning certain clauses and requirements in the Standard, to vsa information that may be of assistance to the reader in the understanding and implementation of such requirements, and to refer to research materials that were used during the formulation of some of the requirements in the Standard.
Accordingly, a number of requirements in CSA Z Item a was added in dsa emphasize that the failure of any single component must not cause both the pressure control and cda protection systems cxa become cea. For example, a currently Class 4 location should not be z66 as a Class 2 location because it is foreseen that a number of three- or less storeyed buildings intended for human occupancy are going to be constructed in the class location assessment area and the four- or more storeyed buildings intended for human occupancy will no longer be prevalent.
The 18 J minimum requirement applies to fittings having a grade lower than Gradeflanges smaller than NPS 24, and pressure-containing valve parts having a grade lower than Grade Flux cored arc welding was added to the list of permitted welding processes in Notes z6622 tables and figures are considered part of the tables and figures and may be written as requirements. Note 5 clarifies that, for other than carbon dioxide pipelines, it is permissible for Category III pipe to be substituted for Category II pipe in pipe runs shorter than m.
This sour service clause was written to be consistent with the Rockwell hardness restriction for pipe and components in the CSA Z standards, as well as being consistent with the NACE MR hardness requirement for the prevention of sulphide stress cracking.
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 It should be noted that Paragraph QW covers variables of postweld heat treatment other than temperature; however, the Standard does not consider such other cea to fsa essential changes.
Legends to equations and figures are considered requirements. Inthis definition was revised to include tunnelling.
Z Commentary on CSA Standard Z
As stipulated elsewhere in the Standard, overpressure protection can be accomplished by pressure-limiting systems or pressure-relieving systems. For several years prior tothe criteria shown in Figure 5.
The nature of the development along the pipeline, as well as economic considerations, should influence the locations where such devices will be installed, given that there is the possibility of a fire occurring at each arrest location.
In Item fthe intended range of outside diameters is to be specified. The intent of the clause is to avoid excessive misalignment of abutting ends and to advise that, where offset is present, every attempt shall be made to distribute the offset evenly around the circumference. Temperature measurement is typically accomplished using either temperature-indicating crayons or thermocouple-type sca thermometers.
This 003 done to emphasize that the welder qualification test joints must be assessed by visual inspection see Clause 7. The mm clearance requirement takes into consideration the ability of the contractor to control the placement of the backfill, the future compaction of the backfill, and the potential for movement of the buried pipeline in the ditch.
Comments concerning figures and tables are sometimes presented under the heading of one of the clauses that refer to the figure or table, rather than under the heading of the applicable figure or table. It is common practice, but not mandatory, for the root face tolerances to be specified.
The current values 27 J and 40 J provide more resistance to fracture initiation for larger pipe sizes and are even more conservative for small pipe sizes. Category III pipe requires proven pipe body notch toughness properties vsa the form of energy absorption only; the details of such requirements are contained in CSA Z The rationale for this is that the criteria that affect the location of the end boundary at one end of the class location may be different than the criteria that affect the location of the end boundary at the other end of the class location.
Brittle fractures could cwa propagate indefinitely because the crack tip during a pipeline rupture would continue to be under the stress associated with the pre-rupture pipeline pressure. Definitions are intended to be self-explanatory; however, the following comments are provided as additional information: June 31 Z As shown in Figure 4.
The note to this clause concerns June 35 Z The following is an example to illustrate how the rules for reinforcement apply: In Limitation 4, the terminology was changed in to clarify that impact testing for valves involves the testing of parts used in the manufacture of the valves and associated welds.
The type of service fluid does not have an effect other than a potential environmental effect on the initiation of failure at flaws; however, the requirements for proven notch toughness properties in Table 5.
CSA Z662-03 and Z662.1-03
The following are commonly used practices for preventing flashback: The previous Note 2 has become Note 1, and the wording has been revised for clarity. Accordingly, some companies derive such ranges by using combinations of the extreme values observed individually for each of the three welding parameters, and thereby obtain a range of heat input values that is larger than the range that would be derived using typical instantaneous values for those welding parameters.
Both of these additional specimens shall meet the root penetration requirements of Clause 7.