| 1 | Know the standard units of measurement used in the mechanical services industry | 1.1 | State the application and use of Internationally recognised (SI) units of measurement • Metre (length) m • Kilogram (mass) kg • Second (time) s • Kelvin (temperature) OK |
| 1.2 | State the application and use of SI derived units • Area (m2) • Volume (m3) - Litres (L) • Density (kg/m3) • Velocity (m/s) |
| 2 | Know the properties of materials used in the mechanical services industry | 2.1 | Calculate the relative densities of common materials • Relative density to air • Relative density to water |
| 2.2 | State the principle applications of solid materials used in the mechanical services industry • Metals - Pure metals - Ferrous metals - Alloys including solders • Plastics - Thermo plastics - Thermo-setting plastics • Fireclays/ceramics |
| 2.3 | Identify the detailed properties of solid materials • Strength – tensile and compressive • Hardness • Ductility • Malleability • Conductivity – heat and electricity |
| 2.4 | State the reasons why solid materials breakdown • Atmospheric corrosion - Oxidisation of metals • UV damage to plastics • Heat damage to plastics • Electrolytic corrosion - Electromotive series - Dissimilar metals in the presence of an electrolyte (water) • Erosion corrosion • Methods of preventing corrosion |
| 2.5 | State the principle applications and basic properties of liquids used in the mechanical services industry • Water • Refrigerant • Anti-freeze/glycol mixes • Fuel oils • Lubricants/greases |
| 2.6 | Identify the detailed properties of water • Boiling/freezing point • Change of state and molecular changes - Volume and pressure increases - Density at differing temperatures - To steam/super heated steam • Capillarity • Acidity/alkalinity (pH value) • Water hardness - Soft - Temporary hard - Permanently hard |
| 2.7 | State the principle applications of gases used in the mechanical services industry • Air & steam • LPG • Natural gas • Carbon dioxide • Refrigerant gases |
| 2.8 | Identify the detailed properties of gases • Pressure exerted by a gas • Volume occupied by a gas • Temperature of gases found within the industry • Gas Laws – - Charles’s law - Boyle’s law • Heat pump/refrigeration cycle |
| 3 | Know the relationship between energy, heat and power in the mechanical services industry | 3.1 | Identify the relationship between the Celsius and Kelvin temperature scales • Units of temperature measurement • Temperature measurement devices used |
| 3.2 | Identify the terminology associated with a change of state • Melting • Freezing • Boiling • Evaporating • Condensing |
| 3.3 | Identify the terms latent and sensible heat as they apply to liquids and gases |
| 3.4 | Identify the methods of heat transfer • Conduction in solids • Convection in liquids and gases • Radiation between two bodies |
| 3.5 | State how units of energy and heat are related and derived • Energy – Joules (J) • Specific heat capacity (kJ/kg/°C) • Power – Watts (W) |
| 3.6 | State how to carry out simple heat, energy and power calculations • Simple temperature calculations • Quantity of heat energy required to raise the temperature of a substance • The amount of power required to heat a substance |
| 4 | Know the principles of force and pressure and their application in the mechanical services industry | 4.1 | State how units of force and pressure are derived from SI units • Acceleration (m/s2) - Force due to gravity • Force - Newton (N) • Pressure (N/m2) - Atmospheric pressure - Principles of the siphon • Flow rate (m3/s) |
| 4.2 | State the application and use of units of measurement of pressure and flow rate • Pressure - Bar / millibar - kPa - Psi - Metre head • Flow rate - m3/s - l/s - kg/s |
| 4.3 | State how to carry out simple force and pressure calculations • Simple force calculations • Pressure head • Simple pressure calculations - Static pressure - Dynamic pressure |
| 4.4 | Identify the relationship between velocity, pressure and flow rate in systems • Effects of increasing/reducing pressure on velocity and flow rate • Effects of increasing/reducing pipe size on velocity and flow rate at constant pressure |
| 4.5 | Identify the reasons why pipework restricts the flow of liquids and gases • Changes of direction, bends and tees • Pipe size • Pipe reductions • Roughness of material surface • Constrictions such as valves |
| 5 | Know simple mechanical principles and their application in the mechanical services industry | 5.1 | State the principles behind simple machines • Mechanical advantage • Velocity ratio - Levers - Wheel and axle - Pulleys - Screws |
| 5.2 | Identify the principles of basic mechanics • Theory of moments • Action & reaction • Centre of gravity • Equilibrium |
| 6 | Know the principles of electricity as they relate to the mechanical services industry | 6.1 | State the basic principles of electron flow theory • Measurements of electrical flow • Material conductivity and resistance • Direct and alternating current |
| 6.2 | State the purpose and application of simple units of electrical measurement for use in the mechanical services industry • Current (Amps) • Voltage (Volts) • Resistance (Ohms) • Power (Watts) |
| 6.3 | State how to carry out simple electrical calculations • Ohm’s law • Power consumption of electrical circuits • Basic over-current protection device size • Voltage, current and resistance in series and parallel circuits |
| 6.4 | Identify the requirements for earthing of electrical circuits |
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