MAWP (Maximum Allowable Working Pressure) is the maximum pressure at which the weakest component of a pressure vessel can operate at its designated temperature (usually at the top of the vessel). Design Pressure is a slightly higher value (typically 10% or 30 psi over MAWP) used for calculating the vessel’s thickness to account for pressure relief device accumulation. Pro Tip: Modern software (PV Elite, Compress) calculates MAWP automatically. Be ready to discuss how corrosion allowance affects MAWP over time.
The strongest head shape. It can withstand twice the pressure of a torispherical head of the same thickness. It requires a thickness roughly half that of the vessel shell.
SCC is the cracking of a material caused by the simultaneous presence of three factors: a susceptible material, a tensile stress (applied or residual), and a corrosive environment. Common examples include: static equipment interview questions updated
What is the company in? (e.g., Refining, Upstream, EPC Consulting) What is the seniority level of the role?
Primary stress is necessary for equilibrium (e.g., hoop stress from pressure); Secondary stress is self-limiting and caused by constraints or geometry (e.g., thermal expansion). 4. Maintenance & Operational Safety MAWP (Maximum Allowable Working Pressure) is the maximum
"You are designing a heat exchanger for a highly corrosive fluid with significant thermal expansion." The Question: "Choose between a Fixed Tubesheet with an expansion bellow or a Floating Head
Large containers used to store fluids at atmospheric or low pressure. Be ready to discuss how corrosion allowance affects
PWHT involves heating a welded component to a specific temperature below its transformation range, holding it, and cooling it uniformly. It is required to:
For severe duties in petroleum and related processing applications.
16. What is stress corrosion cracking (SCC), and how do you prevent it?