Status: Alert Withdrawn.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 order to require a Class 4 location designation, the class location assessment area has to contain a higher count of four- or more storeyed buildings intended for human occupancy than its count of three- or less storeyed buildings intended for human occupancy.
For the branch pipe: For such stresses, the arrest of propagating fractures comes into doubt, and the conventional industry practice is to ensure that the pipe has sufficient notch toughness properties to result in a predicted fracture length that is reasonable.
CAN/CSA-Z | Standards Council of Canada – Conseil canadien des normes
Designers are cautioned that the requirements in this Standard may not be appropriate for gases other than natural gas, manufactured gas, or synthetic natural gas. As such, the pipe could be marked with the API monogram. Note 1 was added in as a reminder to the designer that, where applicable, the sour service requirements in Clause 5.
As defined in Table 7. Init became additionally permissible for such modifications or exemptions to be used for pipeline systems for service fluids other than gas distribution, provided that the applicable limitations in Items a to c are met.
Other crossings including bridge crossings and temporary vehicle access crossings are to be designed in accordance with the applicable 0 of Clauses 4. Offshore Steel Pipelines Any lower temperatures that could occur while the pipe is not so pressurized, such as during shipment to the field or during installation, are not required to be considered because fractures at such low stress levels are not considered to be notch toughness dependent, and therefore they would not constitute a safety hazard.
This is analogous to the change made in to Clause 5. Category III pipe is required or permitted where resistance to long propagating fracture is not a concern. The note was added for instruction on the preparation of half-circumference butt weld test joints, in instances where they are cas to be used see Clause 7.
For Class 2 locations, the hydrostatic test factor of 0. In addition, one of the reasons for the publication of the original Z Accordingly, for such cases, the hoop stress developed by the gaseous pressure-test medium rather than the design operating stress is to be used in determining whether supplementary design measures to provide positive control of fracture propagation are necessary.
Z662.1-03 Commentary on CSA Standard Z662
Similarly, a change in the filler metal size diameter is an essential change, as specified in Table 7. The previous Note 3 has become Note 2, and the wording has also been revised slightly for clarity.
Notwithstanding, it is understood that piping would be installed in accordance with some sort of documented procedures; accordingly, the requirements in Clause 6 are much less detailed than the requirements in other clauses in the Standard. Inthis definition was revised to include tunnelling. Inthe outside diameter threshold was changed from Inthe foregoing class location concept was incorporated into the first edition of CSA Z, along with the two population density indices the one-mile density index and the ten-mile z62 index, representing the number of buildings intended for human occupancy in the applicable area and the four class x662 designations.
The forms were not carried over into the first edition of the Standard because they were considered, in some cases, to be incomplete and somewhat misleading. Aluminum Piping Most, but not necessarily all, of such variables are limited by the essential changes given in Table 7.
Prior tothe testing requirements for welding procedure specification qualifications and welder qualifications were present in separate clauses, but were virtually identical in scope with the exception that tensile testing was not required for welder qualification testing. The control of fracture appearance is intended to ensure that any pipe fractures would be in the ductile mode rather than in the brittle mode.
June 25 Z Any imperfections detected visually are to be assessed using the applicable acceptance criteria in Clause 7. The note to Clause 5. It is intended that such consideration during z662 the pipeline should be a basis for increasing the class location designation, not decreasing it. This formula was developed for buried pipelines mm OD or smaller, operating at pressures not exceeding 8 MPa, and conveying gases that exhibit single-phase decompression.
Inthe wording in this clause was also revised to include reference to the visual inspection requirements of Clause 7. Changes greater that the essential changes given in Table 7. Category II and Category III pipe have the same resistance to fracture initiation if the absorbed energy on a Charpy V-notch impact test is the same for both types of pipe.
Circumferential Cracks in Pressure Vessels and Piping.
Z Commentary on CSA Standard Z
For example, if the branch pipe were to be attached to the run pipe using the configuration shown in the upper sketch in Figure 7. It is independent of the grade of the pipe or component, except that the limit does not apply if the base material has a specified minimum yield strength of MPa or less, which for most piping items is equivalent to being a grade higher than Grade The longitudinal joint factor of 0.
Ina number of modifications to the foregoing class location definition and designation criteria were included in CSA Z, mainly based upon concepts that had been developed in for inclusion as Part of the US Federal Safety Standards for Gas Pipelines.
A satisfactory macrosection test will demonstrate, for the specific plane examined, that there is complete penetration and fusion, absence of cracks, absence of a defined amount of gas pockets and slag inclusions, and absence of excessive concavity or convexity.
I pipe value for It should be noted that carbon dioxide might additionally be present in conventional pipelines as a component of a multiphase fluid or as a component of a fluid in a gas gathering system.
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. Although some limitations concerning the use of materials are specified in the Standard, the user of the material has the ultimate responsibility of determining whether specific materials are appropriate for the intended service conditions. Note 9 limits the amount of material that can be thinner than the design thickness of the lower yield strength item.
The results of limited burst testing of modern pipe have demonstrated that the product has been substantially improved as a result of the use of the improved steel-making and pipe-making processes.