In the thickness calculation t = MAWP x SF x RAD / TS x Eff, MAWP stands for which term?

• A. Minimum Allowable Working Pressure
• B. Maximum Allowable Water Pressure
• C. Maximum Allowable Working Pressure
• D. Main Allowable Water Pressure

Answer: (C)

The term is Maximum Allowable Working Pressure. MAWP is the highest pressure at which a pressure vessel is permitted to operate safely, as defined by the design code. In the thickness calculation, you multiply this allowable pressure by a safety factor and other geometric and efficiency terms to determine the required wall thickness. If MAWP increases, the calculated thickness grows, ensuring the vessel can safely contain the higher operating pressure. The other phrases describe different concepts (like water pressure or minimum values) and are not the standard designation used in boiler design calculations.