API RP 5L8:1996(R2015) pdf download.Recommended Practice for Field Inspection of New Line Pipe
1 Scope and Application
1.1 BASIS FOR INSPECTION
This document contains practices recommended for use in the inspection of new line pipe subsequent to production by the manufacturer. Appendix A contains ordering information for owners desiring to order inspection of new pipe per this document. The basis for performing an inspection may have its origin either in API Specification 5L or in a supplemental specification or contract prepared by the owner. The inspec- tions represented by the practices may be placed in one of three categories as follows: a. Inspections specified in API Specification 5L. b. Inspections specified as one of several options in API Specification 5L. c. Inspections not specified in API Specification 5L.
1.2 APPLICABILITY OF INSPECTIONS
1.2.1 Some of the practices contained in this recommended practice are applicable to pipe regardless of size or type. Other practices typically may have limited applicability. Table 1 indicates those inspections that are available in the field and covered by this recornmended practice in relation to pipe type. It is the owner’s responsibility to specify which inspections are to be used when completing the ordering information (see Appendix A) to accompany an inspection contract.
1.3 REPEATABILITY OF RESULTS
1.3.1 Sources of Variation Every inspection and measurement process is character- ized by an inherent variability of results. The nondestructive inspections and measurements included in this recommended practice are characterized by additional inherent variability attributable to the following factors: a. API Specification 5L permits options in the selection of practices to be used in the inspection for specific attributes. b. Within a single practice, API Specification 5L permits options in the selection of calibration standards. c. Each manufacturer of nondestructive inspection systems uses different mechanical and electronic designs. d. Certain practices in this recommended practice are based on operation of the system at high, and even maximum, sensi- tivity without the use of the reference standards specified in API Specification 5L. e. Within the performance capability of a single nondestruc- tive inspection system installation, there will not be perfect repeatability of results.
3.20 cathode ray tube (CRT): A vacuum tube with a luminescent screen often used for viewing ultrasonic echo signals or for video readouts of computer stored data. 3.21 central conductor (shooting rod): A conductor that is passed through the pipe, for the purpose of creating a circular or circumferential magnetic field in the pipe. This term does not imply that the current rod must be centered in the pipe. 3.22 chock: Block or wedge used beneath a length of pipe so that it cannot roll. 3.23 circular (circumferential) magnetic field: The magnetic field in or surrounding a current-carrying conductor or pipe with an interior current-carrying rod. 3.24 circular (circumferential) magnetization: Cir- cular magnetization is the production of a magnetic field in a pipe wall such that the magnetic field is oriented circumferen- tially. 3.25 circumferential magnetization: See circular nlugt1eri:ation. 3.26 classification: The action taken to categorize a length of new line pipe based on conformance with the con- tracted inspection requirements.
API RP 5L8:1996(R2015) pdf download
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