What is typically sealed off or isolated before performing a line tightness test on a tank piping run?

What is typically sealed off or isolated before performing a line tightness test on a tank piping run?

• A. The entire facility's gas supply
• B. The section of piping being tested is isolated from the rest of the system, and the product side is shut off and vented as required
• C. The building's HVAC system
• D. All nearby electrical equipment

Answer: (B)

The key idea is that a line tightness test must be confined to the specific piping segment being evaluated. To do this safely and accurately, you isolate that section from the rest of the system and shut off the product side, then vent it as required. Isolating the test section ensures the test pressure is applied only to the segment under inspection, so any pressure drop you observe is due to leaks in that segment rather than elsewhere in the system. Shutting off and venting the product side removes residual product and air, reducing the risk of unwanted flow, ignition hazards, and interference with the test readings. Other parts of the facility, such as the overall gas supply, the HVAC system, or nearby electrical equipment, are not part of this isolated test and don’t need to be manipulated for the purpose of evaluating the tightness of the tank piping run.

The key idea is that a line tightness test must be confined to the specific piping segment being evaluated. To do this safely and accurately, you isolate that section from the rest of the system and shut off the product side, then vent it as required. Isolating the test section ensures the test pressure is applied only to the segment under inspection, so any pressure drop you observe is due to leaks in that segment rather than elsewhere in the system. Shutting off and venting the product side removes residual product and air, reducing the risk of unwanted flow, ignition hazards, and interference with the test readings. Other parts of the facility, such as the overall gas supply, the HVAC system, or nearby electrical equipment, are not part of this isolated test and don’t need to be manipulated for the purpose of evaluating the tightness of the tank piping run.