CSA Z662 03 PDF

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Status: Alert Withdrawn.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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Z Commentary on CSA Standard Z

Note 9 limits the amount of material dsa can be thinner than the design thickness of the lower yield strength item. June 57 Z Although the purchaser is not permitted to design on the basis of actual test values other than the specified minimum values, the purchaser may request that the manufacturer recertify the material as meeting a higher grade than was shown on the original documentation. The design formula establishes the basic relationship between design pressure, pipe size, pipe yield strength, and a number of factors that are intended to limit the design pressure, as follows.

This enables Class 1 location pipelines to be upgraded for service in Class 2 locations without replacement with heavier wall pipe.

The former Figure 4. Definitions are intended to be self-explanatory; however, the following comments are provided as additional information: This change is to clarify that 30 is not necessarily established on the basis of pressure testing, and the change in definition is consistent with the revisions made to Clause 8.

The joint factor is in recognition of the assumed integrity of any mill seam weld and the nondestructive inspection criteria associated with the pipe manufacture. Control of fracture propagation during service is not a concern for conventional LVP and HVP piping because the decompression rate of the service fluid is rapid 2 to 3 times that of a gaseous medium in the presence of a full-bore rupture.

CAN/CSA-Z | Standards Council of Canada – Conseil canadien des normes

In the and versions of Table 4. June 37 Z Figure 2 illustrates the results obtained with three such assessments along a section of a pipeline for which more than one class location designation will result as the class location assessment area is moved along the pipeline. Items z62 and f are provided for safety reasons.

The requirement is based upon the design wall thickness in order to not penalize any pipe that was ordered to a nominal wall thickness thicker than the design wall thickness. Engineering assessments apply to a variety of situations; however, engineering critical assessments apply only to the consideration of imperfections in fusion welds. Therefore, with the revision, 033 duplication has been eliminated, and new clauses have been included, where necessary, to identify z62 differences between the testing requirements for welding procedure specifications and qualification of welders.


The intent of the new wording in Clause 4.

Inthe requirement for valve spacing for Class Location 1 was dropped. June 29 Z In post editions of CSA Z and in the and editions of the Standard, minor modifications of the requirements concerning the determination of class location designations were introduced.

Normally, the editions listed are the editions that were current at the time that the Standard was being edited prior to publication. It is recognized that where upgrading involves the replacement of existing piping with new piping, what was not practical for the old piping is practicable for the new piping.

For example, if a specified root face of 1. Category III pipe is required or permitted where resistance to long propagating fracture is not a concern. Different welder skills and welding practices are required for different weld positions and joint configurations; therefore, the specific weld position and joint configuration used for the welder qualification test joint s will dictate what weld position s and configuration s the welder is qualified to weld.

The note provides the cautionary information that materials approved for use may not have adequate properties for all service conditions that may be encountered; this caution applies to all materials.

Although a single test may suffice, it should be noted that more than one test joint is required if a any ranges specified in the welding procedure specification in relation to the essential changes given in Table 7. The use of fracture-arrest devices has been recognized for many years as a possible measure for the control of fracture length; however, the availability of pipe with sufficient notch toughness properties has made such devices unnecessary. Pipe weld metal notch toughness is a secondary concern, when compared to pipe body notch toughness, for the following reasons: The rationale for the limitation that pipe made to ASTM A 53, Aand A not be used for Category III applications is that special ordering and testing requirements would be needed in order to meet the requirements of Clause 5.

CSA Z662-03 and Z662.1-03

Inthe figure reference to saddle type in Item b was changed from Figure 4. Influence national and international standards development by commenting on draft standards online. As defined in Clause 3, production welding is the execution of welds that are covered by the Standard and are to be part of a pipeline system.

Figure 4 illustrates the caa of such a pair of abutting class location assessment areas along the pipeline to locate the critical dwelling unit for Class 2 location. In addition, the requirements for components to be used in the repair of existing piping have been modified to allow more choice and to permit the use of used components. 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.


In this figure, the abutting pair is located too far to the left in Sketch aproperly in Sketch band too far to the right in Sketch c. The specific note identified by an asterisk in Table 4. With the edition of that standard, the requirement was changed to refer to areas where buildings intended for human occupancy with four or more storeys above ground were prevalent. Two notes have been added to the bottom of this table to provide some cs.

Z662.1-03 Commentary on CSA Standard Z662

The csq for class location areas csaa changed from one-half mile to one-quarter mile, based upon a study in the US that indicated that the environment of a pipeline could reasonably be reflected with the narrower width; in addition, the developers of the US regulations considered it unlikely that cea population change more than an eighth of a mile away from the pipeline would cssa an effect on the pipeline, and unlikely that an accident on the pipeline would have an effect on the people or buildings that were more than an eighth of a mile away.

Item a was added in to emphasize that the failure of any single component must not cause both the pressure control and overpressure protection systems to become inoperative. Any required testing for notch toughness properties is to be done at or below the applicable minimum design temperature for the piping, in order to ensure that the required amount of notch toughness will be available during pressure testing and in service.

The carbon csz formula in Item d was developed in Japan circa by N. 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.

This new clause was necessary due to the deletion of centrifugal pumps from Clause 4. Clause 15 of Z was developed to incorporate and update the requirements for the design, construction, operation, and maintenance of aluminum piping that were contained in CSA ZM and to reference CSA Z Class 4 locations included areas where multi-storeyed 4 or more storeys A662 17 Z