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ASME B31.3-2016 (a) a bonder or bonding operator has not used the (b) Procedure. Joints shall be made in accordance with specific bonding process for a period of 6 mo or more,or the qualified BPS. (b) there is specific reason to question the individual's (c) Branch Connections. A fabricated branch connec- ability to make bonds that meet the BPS tion shall be made by inserting the branch pipe in the hole in the run pipe. Dimensions of the joint shall con- form to Fig. 328.4.4 sketch (c). The hole in the run pipe A328.3.1 Materials. Bonding materials that have shall be beveled at 45 deg. Alternatively, a fabricated deteriorated by exposure to air or prolonged storage,or branch connection shall be made using a manufactured will not spread smoothly, shall not be used in making full reinforcement saddle with integral socket. joints. A328.5.3 Solvent Cemented joints in Thermoplastic A328.3.2 Equipment. Fixtures and tools used in Piping 5 making joints shall be in such condition as to perform (a) Preparation. Thermoplastic pipe and fitting sur- their functions satisfactorily faces shall be prepared in accordance with ASTM D2855 for PVC, ASTM F493 for CPVC, and ASTM D2235 for A328.4 Preparation for Bonding ABS.A dry fit test of each joint is required before solvent Preparation shall be defined in the BPS and shall spec- cementing. The pipe shall enter the fitting socket ify such requirements as between one-third and two-thirds of the full socket (a) cutting depth when assembled by hand. (b) cleaning (b) Procedure. Joints shall be made in accordance with (c) preheat the qualified BPS.ASTM D2855 provides a suitable basis (d) end preparation for development of such a procedure. Solvent cements (e) fit-up for PVC,CPVC,and ABS shall conform to ASTM D2564, D2846, and D2235, respectively. Application of cement A328.5 Bonding Requirements to both surfaces to be joined and assembly of these A328.5.1 General surfaces shall produce a continuous bond between them (a) Production joints shall be made only in accordance with visual evidence of cement at least flush with the with a written bonding procedure specification (BPS) outer end of the fitting bore around the entire joint that has been qualified in accordance with para.A328.2. perimeter. See Fig. A328.5.3. Manufacturers of piping materials, bonding materials, (c) Branch Connections. A fabricated branch connec- and bonding equipment should be consulted in the prep- tion shall be made using a manufactured full reinforce- aration of the BPS. ment saddle with integral branch socket. The (b) Production joints shall be made only by qualified reinforcement saddle shall be solvent cemented to the bonders or bonding operators who have appropriate run pipe over its entire contact surface. training or experience in the use of the applicable BPS A328.5.4 Heat Fusion joints in Thermoplastic Piping' and have satisfactorily passed a performance qualifica- tion test that was performed in accordance with a quali- (a) Preparation. Surfaces to be heat fused together fied BPS. shall be cleaned of all foreign material. (c) Each qualified bonder and bonding operator shall (b) Procedure. Joints shall be made in accordance with be assigned an identification symbol. Unless otherwise the qualified BPS. The general procedures in specified in the engineering design, each pressure- ASTM D2657,Techniques I—Socket Fusion,II—Butt containing bond or adjacent area shall be stenciled or Fusion,and III—Saddle Fusion,provide a suitable basis otherwise suitably marked with the identification sym- for development of such a procedure. Uniform heating bol of the bonder or bonding operator. Identification of both surfaces to be joined and assembly of these stamping shall not be used and any marking paint or surfaces shall produce a continuous homogeneous bond ink shall not be detrimental to the piping material.In lieu between them and shall produce a small fillet of fused of marking the bond,appropriate records may be filed. material at the outer limits of the joint.See Fig.A328.5.4 (d) Qualification in one BPS does not qualify a bonder for typical heat fusion joints. Fixtures shall be used to or bonding operator for any other bonding procedure. align components when joints are made. (e) Longitudinal joints are not covered in para.A328. (c) Branch Connections. A fabricated branch connec- tion is permitted only where molded fittings are A328.5.2 Hot Gas Welded joints in Thermoplastic unavailable. Piping 5 (a) Preparation. Surfaces to be hot gas welded A328.5.5 Electrofusion joints in Thermoplastic together shall be cleaned of any foreign material. For Piping s butt welds,the joining edges should be beveled at 20 deg (a) Preparation. Surfaces to be heat fused together to 40 deg with 1 mm (%2 in.) root face and root gap. shall be cleaned of all foreign material.