Status: Alert Withdrawn.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
Inin Clauses 4. Comments concerning specific fsa are sometimes presented under the heading of the broader clause number, rather than under the heading of the applicable subordinate clause number.
At the present time there is no consensus on the specific manner in which heat input values are to be calculated or documented e. Accordingly, at that time, revisions were made in order to permit dual qualification of the welder based upon qualification using branch connection welding, provided that the welding process and bead deposition techniques to be used for fillet welding are similar to those that were used for the qualification test welding for the z6662 connection.
In addition to the conventional full-penetration csz qualification test, a second butt weld test joint shall be made in accordance with the intended production welding procedure, with this second test joint being a partialpenetration weld.
Such gaskets are recommended for use with small male and female and small tongue-and-groove facing types and are permitted for use with raised face, lapped, large male and female, and large tongue-and-groove facing types. It is the intent that the fillet weld type include piping branch connections, even though, technically, piping branch connections involve a full-penetration groove weld covered with a fillet weld.
Although the purchaser is not fsa 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.
In s662 to the foregoing, any undercuts adjacent to the final bead on the outside of the pipe are to be less than 1 mm deep in order to be acceptable, and the weld csq to have a neat appearance.
Reference Publications 4 3. With special provisions to prevent the future pinning of the pipeline, the clearance may be reduced. Prior tothis option was only available and was, in fact, mandatory for auxiliary piping, such as lubricating oil, water, steam, process, and hydraulic piping. Class 4 locations were simplified to areas where buildings with four or more storeys above ground were prevalent, in recognition that the previous additional characteristics concerning traffic density and the presence of numerous underground utilities were considered to be redundant.
This new clause was necessary due to the deletion of centrifugal pumps from Clause 4. Design operating stress is used as the criterion to establish the requirements for proven notch toughness in Table 5. 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.
As such, the class location length that is influenced by such buildings is independent of their separation distance from other such buildings.
Gouges and grooves are considered to be defects because it is common for them to be associated with cracks, which could grow and cause a leak or rupture during subsequent pressurization.
Other crossings including bridge crossings and temporary vehicle access crossings are to be designed in accordance with the applicable requirements of Clauses 4. June 69 Z These specific limitations are included in order to ensure that the requirements for macrohardness testing and nondestructive inspection, if applicable, are maintained.
Standards Council of Canada
Each study resulted in the derivation of a June 51 Z Note 5 mandates that a the unit strength product of the design thickness and 033 specified minimum yield strength of the lower yield strength item be not less than the unit strength of the higher yield strength item; b the design thickness of the lower yield strength item be not more than 1. Flashbacks are controllable by the use of flame arresters or positive purge systems, or a combination thereof.
Note 2 was added in to recognize that some of the z626 limitations specifically Limitations 2, 3, 4, 6, and 7 provide alternatives to the notch toughness requirements that are specified in Clauses 5. Low-voltage less than 35 kV csaa current lines pose different concerns than high-voltage alternating current lines. As an alternative to repairing the defective pipe, the affected portion of pipe can be cut out as a cylinder and replaced with another pipe that meets the design requirements.
Ina reference to abandoned piping Item f was added to the list of items in order to clarify that such piping is no longer part of the pipeline system and is therefore outside the scope of the Standard. Pipeline Research Council International. Maximum cooling rate information is not commonly addressed in welding procedure specifications for new construction; however, Clause Class 2 locations included areas with more than 10 but fewer than 46 dwelling units intended for human occupancy, areas where the pipeline was within yards of a building occupied by 20 or more persons during normal use, and areas where the pipeline was within yards of a small, well-defined outside area occupied by 20 or more persons during normal use.
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.
Z Commentary on CSA Standard Z
The design factor F is the primary factor that restricts the design pressure. 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.
Inthe wording in this clause was also revised to include reference to the z62 inspection requirements of Clause 7. The location factor L may result in the design pressure being restricted, dependent upon the class location designation, the service fluid, and other factors, as defined in Table 4. Although there have csw some minor revisions to this table inthere are no substantive changes. This provision recognizes that although such pipe is impact tested using longitudinal 6z62 specimens rather than the transverse test specimens that would be normal for line pipe, it would be capable of meeting the specified requirements if the testing had been carried out using transverse specimens.
The definitions in Clause 3 are general definitions for terms that have the same meanings regardless of their location z66 the Standard.
CSA Z662-03 and Z662.1-03
Init was clarified that pipe manufactured by the low frequency welding process means pipe manufactured using a welding process of less than 1 kHz for the seam weld. These factors were derived at least forty years ago, and the chemical composition of the steels were quite different than the chemical compositions that are used currently; however, the adequacy of these factors has not been challenged, and it is assumed that the factors are still appropriate.
Accordingly, for such cases, the hoop stress developed by the vsa 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 csq are necessary.
The half-mile width was selected because it could be readily located on typical aerial photographs that were used for locating pipelines, and the committee considered that it gave a representative sample of the general area being traversed by the pipeline.
This provision is intended to accommodate short runs of aboveground pipe in compressor stations, for which it was considered that there had been a history of satisfactory performance with Category III pipe, and that long propagating fractures could not occur because the pipe run length is restricted to m maximum.
Read more about subscriptions. The least nominal wall thickness given in Table 4.
Pipe weld metal notch toughness is a secondary concern, when compared to pipe body notch toughness, for the following reasons: