Engineering Abbreviations
79 abbreviations · part of Science & Engineering Abbreviations
Abbreviations used in mechanical, civil, industrial, manufacturing and process engineering: design and simulation software (CAD, CAM, FEA, CFD), industrial automation (PLC, SCADA, HMI), building services (HVAC, MEP, BIM), drawings and documentation (P&ID, GD&T, BOM, ECO), quality, safety and reliability (FMEA, SPC, MTBF, LOTO), welding and inspection, materials and fasteners, and professional licensing. Many are defined in standards from bodies such as ASME, ASTM, ISO and IEC; electronics terms such as PCB or LED are listed separately.
| Abbreviation | Stands for | Description |
|---|---|---|
| AEC | Architecture, engineering and construction | Collective term for the industry that plans, designs and builds structures and infrastructure, used in software marketing, trade publications and professional services. |
| AFUE | Annual Fuel Utilization Efficiency | The percentage of a furnace's or boiler's fuel energy that becomes useful heat over a typical year. |
| AHU | Air handling unit | Large HVAC component that conditions and circulates air for a building, typically a metal cabinet containing a fan, filters, heating and cooling coils, dampers and… |
| ASME | American Society of Mechanical Engineers | Professional society founded in 1880 that publishes key engineering codes and standards, most famously the Boiler and Pressure Vessel Code (BPVC), along with standards… |
| ASTM | ASTM International | Standards organization, founded in 1898 as the American Society for Testing and Materials, that publishes more than 12,000 voluntary consensus standards for materials… |
| BIM | Building information modeling | Process of creating and managing a shared digital model of a building or infrastructure asset that contains geometry plus data such as materials, quantities, costs and… |
| BOM | Bill of materials | Structured list of every part, subassembly, raw material and quantity needed to build a product, often arranged in levels that mirror the assembly. |
| CAD | Computer-aided design | Use of software to create, modify and document 2D drawings and 3D models of parts, products, buildings and circuits. |
| CAE | Computer-aided engineering | Umbrella term for software used to analyze and validate designs by simulation, including finite element analysis for stress and vibration, computational fluid dynamics… |
| CAM | Computer-aided manufacturing | Software that turns CAD models into instructions for manufacturing machines, most often toolpaths and G-code for CNC mills, lathes and routers. |
| CFD | Computational fluid dynamics | Use of numerical methods and computers to simulate the flow of liquids and gases, including air over cars and aircraft, water through pumps, smoke in buildings and… |
| CNC | Computer numerical control | Automated control of machine tools such as mills, lathes, routers, plasma and laser cutters by a computer that follows programmed instructions. |
| COP | Coefficient of performance | Ratio of useful heating or cooling delivered by a heat pump, air conditioner or refrigerator to the electrical energy it consumes. |
| CTE | Coefficient of thermal expansion | Fractional change in a material's length per degree of temperature change. |
| DCS | Distributed control system | Plant-wide control system in which controllers distributed throughout a facility manage individual process units, coordinated over a network with central operator… |
| DFA | Design for assembly | Design approach aimed at reducing assembly time and cost, mainly by cutting the number of separate parts, standardizing fasteners, making parts symmetric or obviously… |
| DFM | Design for manufacturing | Engineering practice of designing parts so they are easy and economical to produce with the intended process, for example by using standard hole sizes, avoiding deep… |
| ECN | Engineering change notice | Document that communicates an approved engineering change to manufacturing, purchasing, quality and suppliers, listing affected parts and drawings and the effective date. |
| ECO | Engineering change order | Formal document authorizing a change to a released design, such as a part's dimensions, material, drawing or supplier, and describing what will change, why and how… |
| EIT | Engineer in Training | Designation granted by state licensing boards to engineering graduates who have passed the Fundamentals of Engineering exam, marking the first step toward Professional… |
| EPC | Engineering, procurement and construction | Contract model in which one contractor takes responsibility for designing, buying equipment and materials for, and building a project, such as a power plant, refinery… |
| ERV | Energy recovery ventilator | Ventilation unit that brings fresh outdoor air into a building while exhausting stale air, transferring heat and moisture between the two streams through a core so… |
| FAT | Factory acceptance test | Testing of equipment at the manufacturer's facility, witnessed by the customer, to verify it meets specifications before shipment. |
| FCAW | Flux-cored arc welding | Semi-automatic welding process similar to MIG but using a tubular wire filled with flux, which produces shielding gas and slag. |
| FE | Fundamentals of Engineering (exam) | First of two exams for US professional engineering licensure, administered by NCEES as a computer-based test covering mathematics, ethics and discipline-specific topics… |
| FEA | Finite element analysis | Simulation technique that divides a structure into a mesh of many small elements and solves equations for each to predict stress, deformation, vibration, heat flow and… |
| FEM | Finite element method | Numerical method for approximately solving the partial differential equations of physics by dividing a domain into small elements with simple equations. |
| FMEA | Failure mode and effects analysis | Systematic method for identifying the ways a product, process or system could fail, the effects of each failure and their causes, then ranking risks so the most serious… |
| FoS | Factor of safety | Ratio of a structure's or component's strength to the maximum load it is expected to carry. |
| GD&T | Geometric dimensioning and tolerancing | Symbolic language on engineering drawings that defines the allowable variation in a part's form, orientation, location and runout relative to datum features. |
| GMAW | Gas metal arc welding | American Welding Society name for MIG and MAG welding, a semi-automatic process using a continuously fed consumable wire and a shielding gas. |
| GTAW | Gas tungsten arc welding | American Welding Society name for the process commonly called TIG welding, in which an arc between a non-consumable tungsten electrode and the workpiece is shielded by… |
| HAZ | Heat-affected zone | Region of base metal next to a weld or thermal cut that did not melt but was heated enough to change its microstructure and properties, sometimes becoming harder, more… |
| HAZOP | Hazard and operability study | Structured team review of a process design, usually based on P&IDs, that systematically applies guide words such as "no," "more," "less" and "reverse" to each part of a… |
| HEPA | High-efficiency particulate air (filter) | Filter standard for removing very fine particles from air; under the US Department of Energy definition, a HEPA filter captures at least 99.97% of particles 0.3… |
| HMI | Human-machine interface | Screen or panel through which operators monitor and control machines and processes, showing status, alarms and trends and accepting commands. |
| HRC | Rockwell hardness C (scale) | Hardness measured on the Rockwell C scale by pressing a diamond cone into a material under a 150-kilogram-force load and measuring how deeply it penetrates. |
| HSS | High-speed steel | Tool steel alloyed with tungsten or molybdenum, chromium and vanadium that keeps its hardness at the high temperatures produced by fast cutting. |
| HVAC | Heating, ventilation and air conditioning | Systems and equipment that control temperature, humidity and air quality in buildings and vehicles, including furnaces, boilers, heat pumps, air conditioners, ductwork… |
| ID | Inside diameter | Diameter measured across the inner surfaces of a pipe, tube, hole, bearing or ring, determining flow capacity and what fits inside. |
| IP | Ingress protection (rating) | Two-digit code, defined in IEC 60529, that rates how well an enclosure keeps out solid objects and dust (first digit, 0-6) and water (second digit, 0-9). |
| LOTO | Lockout/tagout | Safety procedure that ensures machines and equipment are isolated from all energy sources, such as electricity, hydraulic pressure, steam or gravity, and cannot be… |
| MEP | Mechanical, electrical and plumbing | The building services disciplines that make a structure habitable: mechanical systems (HVAC), electrical power and lighting, and plumbing, often with fire protection. |
| MERV | Minimum efficiency reporting value | Rating from 1 to 16 that describes how well an HVAC air filter captures particles from about 0.3 to 10 micrometers, under the ASHRAE 52.2 standard. |
| MIG | Metal inert gas (welding) | Arc welding process in which a continuously fed wire electrode melts into the joint while a shielding gas protects the weld. |
| MTBF | Mean time between failures | Average operating time between failures of a repairable system, a key reliability measure for equipment such as hard drives, pumps, aircraft components and power… |
| MTTR | Mean time to repair | Average time needed to restore failed equipment to working order, including diagnosis, repair and testing. |
| NDT | Nondestructive testing | Inspection methods that find cracks, voids, corrosion and other flaws in materials and structures without damaging them. |
| NPT | National Pipe Thread | US standard for tapered threads on pipes and fittings, in which the threads seal as they are tightened because the diameter changes by 1 in 16 along the length. |
| O&M | Operations and maintenance | Activities and costs involved in running and maintaining a facility or asset after it is built, including staffing, inspections, repairs, spare parts and routine… |
| OD | Outside diameter | Diameter measured across the outer surfaces of a pipe, tube, shaft, bearing or other round part. |
| OEE | Overall equipment effectiveness | Manufacturing metric that combines availability (uptime), performance (speed) and quality (good parts) into a single percentage showing how productive a machine or line… |
| OT | Operational technology | Hardware and software that monitor and control physical equipment and processes, such as PLCs, SCADA, DCSs and safety systems in factories, utilities, pipelines and… |
| P&ID | Piping and instrumentation diagram | Detailed schematic of a process plant showing piping, valves, pumps, vessels, instruments and control loops with standardized symbols and tag numbers. |
| PE | Professional Engineer | State license that allows an engineer to offer engineering services to the public and to sign and seal plans, reports and drawings. |
| PFD | Process flow diagram | Simplified diagram of a chemical or industrial process showing the major equipment, main process streams and key operating conditions such as flow rates, temperatures… |
| PID | Proportional-integral-derivative (controller) | Control algorithm that continuously adjusts an output, such as valve position or heater power, based on the present error from a setpoint (proportional), the… |
| PLC | Programmable logic controller | Rugged industrial computer that controls machines and processes by reading sensors and switching motors, valves and other outputs according to a program. |
| PLM | Product lifecycle management | Strategy and software for managing all information about a product from concept and design through manufacturing, service and retirement, including CAD files, bills of… |
| RC | Reinforced concrete | Composite material in which steel bars (rebar) or mesh embedded in concrete carry tensile forces, while the concrete resists compression. |
| RCA | Root cause analysis | Structured investigation to find the underlying causes of a failure, accident or quality problem rather than only its symptoms, so that corrective actions prevent… |
| RFI | Request for information | Preliminary procurement document that gathers general information about suppliers' capabilities, products and approaches before a buyer writes a formal RFP or RFQ. |
| RTU | Rooftop unit | Packaged HVAC unit installed on the roof of a commercial building that combines fans, filters, cooling (and often gas heating or a heat pump) in one weatherproof… |
| SAT | Site acceptance test | Testing of equipment or systems after installation at the customer's site to confirm they work correctly with the real utilities, process and connected systems. |
| SCADA | Supervisory control and data acquisition | Control system architecture that monitors and controls equipment spread over large areas, such as pipelines, power grids, water and wastewater networks and railways. |
| SEER | Seasonal Energy Efficiency Ratio | The US efficiency rating for central air conditioners and heat pumps: seasonal cooling output in BTU divided by electricity used in watt-hours. |
| SIL | Safety integrity level | Measure of the risk reduction provided by a safety function, such as an automatic shutdown system, defined in IEC 61508 and related standards. |
| SMAW | Shielded metal arc welding | Manual arc welding process, commonly called stick welding, that uses a consumable electrode coated in flux. |
| SPC | Statistical process control | Use of statistical methods, especially control charts, to monitor a manufacturing process and detect when variation exceeds what is normal, so problems are corrected… |
| SS | Stainless steel | Steel containing at least about 10.5% chromium, which forms a thin, self-repairing oxide layer that resists rust. |
| TIG | Tungsten inert gas (welding) | Arc welding process that uses a non-consumable tungsten electrode and an inert shielding gas, usually argon, with filler rod added by hand. |
| TRL | Technology readiness level | Nine-step scale for gauging the maturity of a technology, from TRL 1, basic principles observed, to TRL 9, a system proven in actual operation. |
| ULS | Ultimate limit state | In limit state design, the condition beyond which a structure would collapse or suffer failure of a member, such as rupture, buckling or loss of equilibrium. |
| UNC | Unified National Coarse (thread) | Standard series of inch-based screw threads with relatively few threads per inch, the most common choice for general-purpose bolts and screws in North America. |
| UNF | Unified National Fine (thread) | Inch-based screw thread series with more threads per inch than UNC, giving greater tensile strength for a given diameter and finer adjustment. |
| UT | Ultrasonic testing | Nondestructive testing method that sends high-frequency sound pulses, typically 1 to 10 megahertz, into a material and analyzes the echoes to find internal flaws or… |
| UTS | Ultimate tensile strength | Maximum stress a material can withstand while being stretched before it breaks, measured in megapascals or pounds per square inch. |
| VAV | Variable air volume | HVAC system design that conditions air to a constant temperature and varies the quantity delivered to each zone using motorized dampers in terminal boxes. |
| VFD | Variable-frequency drive | Electronic motor controller that varies the frequency and voltage supplied to an AC motor to control its speed. |
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