ASME A112.20.1:2004 pdf free download

ASME A112.20.1:2004 pdf free download.Qualification of lnstallers of High Purity Piping Systems.
1.4 Examiners of High Purity Piping System Welding Nonmandatory Appendix A provides suggested
guidelines for examiners of high purity piping system welding.
2 GENERAL KNOWLEDGE
2.1 Terms and Definitions
The high purity piping system installer shall demonstrate a basic working knowledge of the appropriate and pertinent terms contained in the standards referenced in para. 1.3 and this Standard.
2.2 Laws, Codes, Rules, Listing Agencies, and Regulations
The high purity piping systems installer shall be able to identify and demonstrate knowledge of the applicable laws, codes, rules, listing agencies, and regulations from the federal, state, provincial, and local levels recognized by the Authority Having Jurisdiction relating to high purity piping installations.
3 PRODUCT PERFORMANCE KNOWLEDGE
3.1 Major Components
The high purity system installer shall be able to list the parts and identify the major components of high purity piping systems and equipment.
3.2 Application and Testing
The high purity piping system installer shall be able to identify and describe the proper application and testing procedures of high purity piping systems.
4 PRODUCT INSTALLATION KNOWLEDGE
4.1 Installation Requirements
The high purity system installer shall be able to understand and recognize the proper installation requirements
7.5.1.1 Examination. The qualification examinationshall consist of a written, practical,and, when appro-priate, oral examination by the QAR.
7.5.1.2 Passing Criteria.The high purity Installershall have achieved at least an 80% correct score to passthe written qualification examination.
7.5.1.3 Continuity.Continuity requirements shallbe the same as those contained in Section LX of the ASMEBoiler and Pressure vessel Code.
7.5.2 Practical Skills and Knowledge
7.5.2.1 Methodology. The nonmetallic welder shallprove his practical skills in accordance with the method-ology being employed.
7.5.2.2 Testing.Testing shall include the following:
(a) materials technology (thermoplastics)
(b) welding principles and joining methods
(c) context between temperature, pressure, and time
(d) choice of parameters
(e) designation and rules for the processing of plasticsand filler materials to which the examination is designedto apply
(f ) meaning of standardized welding signs andsymbols
(g) types and shapes of welds
(h) requirements of the welding equipment
(i) influences on the weld quality
7.5.3 Welding Performance. The qualified installershall demonstrate knowledge concerning the following:
(a) proper preparation of the work pieces for welding
(b)proper operation of the welding equipment
(c) preventing and correcting faults when welding
(d) prevention of accidents and fire damage
7.5.3.1 Test Piece Preparation. The dimensions ofthe test pieces are dependent on the process, the mate-rial, and the work piece thickness and filler material(when necessary).The candidate shall prepare the testpieces in an approved manner for welding. The fabrica-tion of the test pieces shall be judged according to thefollowing:
(a) determination and choice of the welding parame-ters, including the actual measured values
(b)preparation of the joint and welding filler
(c) adjustment and handling of the weldingequipment
(d) control measures and recording
(e) manufacturer’s recommendations.