OKLAHOMA PSI PROCESS PIPING CONTRACTOROKLAHOMA PSI PROCESS PIPING CONTRACTOR Reference Books The following reference materials are allowed in the examination center: Code of Federal Regulations 29 CFR Part 1926 (OSHA), with latest available amendments, OR Code of Federal Regulations 29 CFR Part 1926 Selections by PSI, with latest available amendments. Facility Piping Systems Handbook, Second Edition, 2002, McGraw Hill Publishing, Inc., International Mechanical Code, 2018 Edition,
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