Artículo 148.- Los accesorios para tuberías aéreas deben cumplir con los siguientes estándares:
<table> <thead> <tr> <th>Materiales y Dimensiones</th> <th>Estándar</th> </tr> </thead> <tbody> <tr> <td colspan="2">Hierro fundido</td> </tr> <tr> <td>● cast iron Threaded fittings , Class 125 and 250</td> <td>ASME B16.4</td> </tr> <tr> <td>● Cast Iron Pipe Flanges and Flanged Fittings</td> <td>ASME B16.1</td> </tr> <tr> <td>● Malleable Iron Threaded Fittings Class 150 and 300</td> <td>ASME B16.3</td> </tr> <tr> <td colspan="2">Hierro ductile</td> </tr> <tr> <td>● Malleable Iron threaded fittings, class 150 and 300 steel</td> <td>ASME B16.3</td> </tr> <tr> <td>● Factory-made wrought steel buttweld fittings</td> <td>ASME B16.9</td> </tr> <tr> <td>● Buttwelding end for pipe, valves, flanges, and fittings</td> <td>ASME B16.25</td> </tr> <tr> <td>● Specification for pipping fittings wrought carbon steel and alloy steel for moderate and elevated temperatures</td> <td>ASTM A 235</td> </tr> <tr> <td>● Steel pipe flanges and flanged fittings</td> <td>ASME B16.5</td> </tr> <tr> <td>● Forged steel fittings, socket welded and threaded copper</td> <td>ASME B16.11</td> </tr> <tr> <td>● Wrought copper and copper alloy solder joint pressure fittings</td> <td>ASME B16.22</td> </tr> <tr> <td>● Cast copper alloy solder joint pressure fittings</td> <td>ASME B16.18</td> </tr> <tr> <td>● Chlorinated polivynil chlorid (CPVC) specification for schedule 80 CPVC threaded fittings</td> <td>ASTM F 437</td> </tr> <tr> <td>● Specification for schedule 40 CPVC socket-type fittings</td> <td>ASTM F 438</td> </tr> <tr> <td>● Specification for schedule 80 CPVC socket-type fittings</td> <td>ASTM F 439</td> </tr> </tbody> </table>