What is the maximum pressure capacity for a TMU-72 series coolant pressure tank?

• A. 5,100 ± 100 pounds per square inch gage (psig)
• B. 4,800 ± 150 psig
• C. 6,000 psig
• D. 5,000 psig

Answer: (A)

Understanding the maximum pressure capacity means knowing the highest pressure the tank is designed to safely contain, with any allowed variation. For the TMU-72 coolant pressure tank, the official spec lists 5,100 psig with a tolerance of ±100 psig. That means the safe maximum range is 5,000 to 5,200 psig, and the typical rating to rely on is 5,100 psig. This is the value engineers use to ensure the tank isn’t pressurized beyond what the material and seams can safely handle; exceeding it risks rupture or failure. The other options don’t match the specified rating or its tolerance: they either imply a lower or higher maximum than listed, or ignore the allowable variance.