Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:APPENDIX A – Welding and Testing RequirementsPage #:18 of 22The CONTRACTOR shall be responsible for notifying the ENGINEER at least 24 hours prior tothe proposed start of liquid penetration testing.1.0 PROCEDURE REQUIREMENTS1.1 The liquid penetration examination shall be performed in accordance with adetailed written procedure. The procedure shall be submitted to theENGINEER for review and release prior to such examinations.1.2 The procedure shall include, but not be limited to, the requirements of ANSIB31.1; the American Society for Mechanical Engineers (ASME) Sec V -Nondestructive Examination, Art 6, Para. T681; and this Specification.1.3 In addition to the requirements of ANSI B31.1 and ASME Sec. V., the followingshall apply:1.3.1 Shot or sand blasting shall not be used on the surface prior toexamination.1.3.2 Cleaning solvents and penetration families shall be certified by themanufacturer to contain not more than one percent (1%) by weight ofsulfur, nor more than one percent (1%) residual total halogens.1.3.3 Intermixing of penetration families will not be permitted.1.3.4 Fluorescent penetration examination not allowed.2.0 PERSONNEL REQUIREMENTSPersonnel performing or assisting in liquid penetration examinations shall be qualifiedand certified in accordance with American Society for Nondestructive Testing (ASNT),SNT TC-1A.3.0 EXAMINATION PROCEDURE3.1 The surface condition of finished welds shall be suitable for proper liquidpenetration examination.3.2 All welds shall be visually inspected prior to liquid penetration examination.3.3 Welds shall be repaired if any of the following discontinuities are observed:3.3.1 Cracks;3.3.2 Surface porosity;3.3.3 Excessive weld reinforcement greater than specified in ANSI B31.1,Table 127.4.2;3.3.4 Lack of surface penetration;3.3.5 Incomplete penetration when ID surface is accessible;3.3.6 Undercut shall not exceed 1/32" (0.8 mm) and shall not encroach on theminimum required section thickness;3.3.7 Weld overlap or craters.3.4 Liquid penetration examination shall be performed in accordance with the writtenprocedure.4.0 ACCEPTANCE STANDARDS4.1 Indications whose major dimensions are greater than 1/16" (1.6 mm) shall beconsidered relevant.APPENDIX APage A18