Artículo 145.- Los accesorios para tuberías enterradas deben cumplir con los siguientes estándares:
<table> <thead> <tr> <th>Material</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">Acero</td> </tr> <tr> <td>* Factory-Made wrought steel Buttweld Fittings</td> <td>ASME B16.9</td> </tr> <tr> <td>* Buttwelding Ends for Pipe , Valves , Flanges and Fittings</td> <td>ASME B16.25</td> </tr> <tr> <td>* Specification for Piping Fittings of wrought carbon steel and alloy steel for moderate temperatures</td> <td>ASME A 234</td> </tr> <tr> <td>* Steel Pipe Flanges , Socket Welded and Threaded</td> <td>ASME B16.5</td> </tr> <tr> <td>* Forged Steel Fittings , Socket Welded and Threaded</td> <td>ASME B16.11</td> </tr> <tr> <td colspan="2">Cobre</td> </tr> <tr> <td>* Wrought copper and Bronze solder joint pressure Fittings</td> <td>ASME B16.22</td> </tr> <tr> <td>* Cast bronze Solder Joint Pressure Fittings</td> <td>ASME B16.18</td> </tr> <tr> <td colspan="2">Plástico</td> </tr> <tr> <td>* Chlorinated polyvinyl Chloride (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>