Before sampling foam concentrate from a bladder tank, which procedure must be completed?

Before sampling foam concentrate from a bladder tank, which procedure must be completed?

• A. Open the discharge valve
• B. Ensure the pressure is safely released
• C. Turn off the water supply
• D. Disconnect electrical power

Answer: (B)

Relieving the pressure before accessing the bladder tank is essential. Foam concentrate in a bladder tank is kept under system pressure, and opening a sampling valve while that pressure is still present can cause a sudden, uncontrolled discharge or spray of foam. By depressurizing the tank safely, you remove the energy behind the contents, making the sampling process safer and ensuring you obtain a representative sample without spills or injuries. Opening the discharge valve, turning off the water supply, or disconnecting electrical power aren’t the immediate safety step required for this sampling task.

Relieving the pressure before accessing the bladder tank is essential. Foam concentrate in a bladder tank is kept under system pressure, and opening a sampling valve while that pressure is still present can cause a sudden, uncontrolled discharge or spray of foam. By depressurizing the tank safely, you remove the energy behind the contents, making the sampling process safer and ensuring you obtain a representative sample without spills or injuries. Opening the discharge valve, turning off the water supply, or disconnecting electrical power aren’t the immediate safety step required for this sampling task.