pressure vessel
C1/C2Technical, Engineering, Industrial, Formal
Definition
Meaning
A closed container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.
In engineering and industry, any container built to contain fluids under high pressure, such as boilers, storage tanks, reactors, or autoclaves. Its design, materials, and manufacturing are subject to strict safety codes and regulations.
Linguistics
Semantic Notes
The term is a compound noun functioning as a single semantic unit. It implies a purpose-built, engineered object with specific safety considerations, not just any container under pressure.
Dialectal Variation
British vs American Usage
Differences
The term is identical and standard in both varieties. Minor differences may exist in associated jargon of specific engineering codes (e.g., ASME Boiler and Pressure Vessel Code in the US).
Connotations
Identical connotations of industrial safety, engineering precision, and potential hazard if failed.
Frequency
Equally high frequency in technical contexts in both UK and US; very low frequency in everyday language.
Vocabulary
Collocations
Grammar
Valency Patterns
[pressure vessel] + [verb: must be/can withstand/is designed to][adjective: certified/leak-tight] + [pressure vessel][verb: inspect/certify/operate] + [a/the pressure vessel]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms exist for this highly technical term]”
Usage
Context Usage
Business
The project requires the procurement of three large pressure vessels for the new chemical plant.
Academic
The paper analyses the stress distribution in a spherical pressure vessel under cyclic loading.
Everyday
The scuba diver checked the pressure gauge on his air vessel (tank) before the dive. (Note: 'air tank' is the everyday term; 'pressure vessel' would be overly technical here.)
Technical
The ASME Section VIII, Division 1 code governs the design and fabrication of this Class 1 pressure vessel.
Examples
By Part of Speech
verb
British English
- The reactor must be pressure-vesseled according to the latest standards.
- The company specialises in pressure-vesselling industrial tanks.
American English
- The tank will be pressure-vesseled to meet ASME requirements.
- The process involves pressure-vesselling the storage unit.
adverb
British English
- The tank was constructed pressure-vessel-tight.
- The assembly was performed pressure-vessel-carefully.
American English
- The unit was tested pressure-vessel-safe.
- He works pressure-vessel-meticulously.
adjective
British English
- The pressure-vessel design course is highly specialised.
- They reviewed the pressure-vessel inspection report.
American English
- Pressure-vessel technology has advanced significantly.
- We need a pressure-vessel engineer on site.
Examples
By CEFR Level
- (Not applicable for A2 level; far too technical.)
- The factory has big metal tanks called pressure vessels.
- A pressure vessel holds air or gas with force inside.
- Engineers must ensure that every pressure vessel meets strict safety regulations.
- The accident was caused by a rupture in a poorly maintained pressure vessel.
- Finite element analysis is routinely employed to optimise the wall thickness of a novel pressure vessel design.
- The forensic investigation concluded that the pressure vessel failed due to stress corrosion cracking.
Learning
Memory Aids
Mnemonic
Think of a SUBMARINE HULL: it's a VESSEL that must withstand immense water PRESSURE.
Conceptual Metaphor
A PRESSURE VESSEL is a CONTAINER FOR ENERGY (potential energy stored in compressed fluid).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque 'давление сосуд' – it's incorrect. Use 'сосуд под давлением' or the specific term like 'котёл', 'реактор', 'баллон'.
- The word 'vessel' here does not mean 'ship' (судно), but 'container' (сосуд, ёмкость).
Common Mistakes
- Pronouncing 'vessel' as /vɛˈsɛl/ instead of /ˈvesəl/.
- Using it to refer to any container (e.g., a soda bottle) – it implies engineering design.
- Confusing 'pressure vessel' with 'pressure cooker' in everyday talk (a pressure cooker is a type of domestic pressure vessel).
Practice
Quiz
What is the PRIMARY defining characteristic of a pressure vessel?
FAQ
Frequently Asked Questions
Yes, typically it is a low-pressure vessel designed to withstand the pressure of the municipal water supply and thermal expansion.
All boilers are pressure vessels, but not all pressure vessels are boilers. A boiler is specifically a pressure vessel used for generating steam or heating water.
These shapes distribute internal pressure stress more evenly across the material, reducing points of high stress and making the vessel stronger and safer for a given wall thickness.
In highly technical jargon, it can be used to mean 'to construct or treat as a pressure vessel' (e.g., 'the tank will be pressure-vesseled'), but this is not standard in general English.