27 real Pressure Vessels & Equipment questions from the Process Design bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is ASME VIII Div 1 shell thickness?
Junior
A.cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
B.617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
C.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
D.design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
2. Which term means: "cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance"?
A.ASME VIII Div 1 shell thickness — available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
B.ASME VIII Div 1 shell thickness — factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
C.ASME VIII Div 1 shell thickness — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
D.ASME VIII Div 1 shell thickness — cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
A.factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
B.design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
C.available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
D.area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
5. Which term means: "design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature"?
A.Design pressure vs MAWP — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
B.Design pressure vs MAWP — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
C.Design pressure vs MAWP — factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
D.Design pressure vs MAWP — design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
A.cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
B.area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
C.design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
D.factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
A.Joint efficiency — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
B.Joint efficiency — available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
C.Joint efficiency — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
D.Joint efficiency — factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
A.design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
B.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
C.available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
D.ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
11. Which term means: "ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature"?
A.Hydrostatic test pressure — available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
B.Hydrostatic test pressure — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
C.Hydrostatic test pressure — factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
D.Hydrostatic test pressure — ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
A.design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
B.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
C.area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
D.standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
14. Which term means: "standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles"?
A.API 650 tank — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
B.API 650 tank — cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
C.API 650 tank — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
D.API 650 tank — 617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
A.standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
B.ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
C.available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
D.617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
17. Which term means: "standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation"?
A.API 610 centrifugal pump — design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
B.API 610 centrifugal pump — area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
C.API 610 centrifugal pump — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
D.API 610 centrifugal pump — ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
A.factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
B.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
C.standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
D.available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
20. Which term means: "available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation"?
A.NPSH margin — standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
B.NPSH margin — available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
C.NPSH margin — 617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
D.NPSH margin — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
A.cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
B.available net positive suction head should exceed required by at least 1 m or 10% at rated flow, or more for water and hot hydrocarbons, to avoid cavitation
C.617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
D.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
23. Which term means: "617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries"?
A.API 617 vs API 618 — standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
B.API 617 vs API 618 — factor of 1.0, 0.85 or 0.70 applied to weld strength depending on full, spot or no radiographic examination
C.API 617 vs API 618 — 617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
D.API 617 vs API 618 — design pressure is operating pressure plus a margin (about 10% or 1–2 bar); MAWP is the maximum the weakest component actually permits at design temperature
A.area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
B.standard for heavy-duty refinery pumps classifying overhung, between-bearings and vertically suspended types, with 20-year design life and 3-year uninterrupted operation
C.ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
D.standard for welded atmospheric storage tanks covering shell courses by the one-foot method, bottom plates, cone or floating roofs and nozzles
26. Which term means: "area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad"?
A.Nozzle reinforcement — area-replacement rule in ASME VIII UG-37 where metal removed by an opening is compensated by excess shell thickness, nozzle wall or a reinforcing pad
B.Nozzle reinforcement — 617 covers axial and centrifugal compressors and expander-compressors; 618 covers reciprocating compressors for petroleum, chemical and gas industries
C.Nozzle reinforcement — cylindrical shell formula t = PR/(SE − 0.6P) for internal pressure, with allowable stress S, joint efficiency E and inside radius R, plus corrosion allowance
D.Nozzle reinforcement — ASME VIII Div 1 test at 1.3 times MAWP, corrected by the ratio of allowable stress at test temperature to that at design temperature
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