When replacing an existing building sanitary drainage system, drains under concrete slabs and existing sewers serving the new system shall be _____.

When replacing an existing building sanitary drainage system, drains under concrete slabs and existing sewers serving the new system shall be _____.

• A. Pressure Tested
• B. Externally Examined
• C. Examined Visually
• D. Internally Examined

Answer: (D)

When replacing an existing building sanitary drainage system, it is essential that drains under concrete slabs and existing sewers serving the new system are internally examined. This process involves inspecting the inside of the drainage system for any signs of damage, blockages, or degradation that could affect the overall performance and integrity of the new system. The internal examination ensures that all components are functioning correctly and are free from any obstructions, which is crucial for maintaining proper drainage and preventing future issues such as leaks or backups. This thorough inspection is essential when integrating new systems with existing infrastructure, as any deficiencies discovered can be addressed before the new installation is completed. This approach is preferred over the other options because an external examination may not provide sufficient insights into the condition of the piping materials and connections within the system. Similarly, a visual examination alone might overlook subtle internal defects. A pressure test, while useful in some scenarios for detecting leaks, may not be applicable to all types of existing sewers and could potentially miss internal issues that only a direct inspection would reveal. Hence, the internal examination stands out as the most comprehensive method for assessing the suitability of existing components in conjunction with a new sanitary drainage installation.

When replacing an existing building sanitary drainage system, it is essential that drains under concrete slabs and existing sewers serving the new system are internally examined. This process involves inspecting the inside of the drainage system for any signs of damage, blockages, or degradation that could affect the overall performance and integrity of the new system.

The internal examination ensures that all components are functioning correctly and are free from any obstructions, which is crucial for maintaining proper drainage and preventing future issues such as leaks or backups. This thorough inspection is essential when integrating new systems with existing infrastructure, as any deficiencies discovered can be addressed before the new installation is completed.

This approach is preferred over the other options because an external examination may not provide sufficient insights into the condition of the piping materials and connections within the system. Similarly, a visual examination alone might overlook subtle internal defects. A pressure test, while useful in some scenarios for detecting leaks, may not be applicable to all types of existing sewers and could potentially miss internal issues that only a direct inspection would reveal. Hence, the internal examination stands out as the most comprehensive method for assessing the suitability of existing components in conjunction with a new sanitary drainage installation.