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Elements and Performance Criteria

1. Distinguish between different types of auxiliary boilers
   • Design and use of water tube and fire tube auxiliary boilers are compared and contrasted
   • Movement of water and gas in an operating boiler is sketched
   • How variations to operating pressure and saturation temperature in an auxiliary boiler can be used to get wet, dry or superheated steam is explained
2. Recognise different functions of steam and different components of steam systems
   • Key features of steam and other heating systems are compared and contrasted
   • Steam side requirements of an auxiliary steam turbo alternator are compared and contrasted with other steam-powered machinery
   • Typical steam and condensate system is outlined
3. Explain fuel oil system of auxiliary boilers
   • Combustion process is explained and factors that affect combustion in a boiler are outlined
   • Differentiation is made between different burner types
   • Operation of a complete fuel oil system for an auxiliary boiler including the functions of components for automatic combustion control is outlined
4. Explain procedure for operating fired and unfired boilers
   • Locations of all mountings and fittings on auxiliary boilers are identified and their functions are outlined
   • Purpose of all alarms and shut downs incorporated in auxiliary boilers is clarified
   • Types and operation of safety valves are outlined
   • Procedure for lighting off a boiler from cold is clarified
   • Procedure for laying up for short and long periods including full blow down and shut down procedures is clarified
   • Procedure for isolating an auxiliary boiler after shut down is clarified
5. Explain procedure for sampling and testing boiler water
   • Effects of poor water treatment practices on safety and boiler function are identified
   • Correct procedure for taking boiler and feed water sample and possible errors that might occur are clarified
   • Common water tests carried out are outlined and typical results are stated
   • Chemicals used for treatment of boiler water are named and acceptable range of chemical reserves found in boiler waters are confirmed
6. Explain procedure for maintaining water level in the boiler
   • Method of testing and changing a gauge glass is outlined
   • Effects of blockages in water, steam and drain cocks on levels in gauge glass are outlined
   • Procedure for when a gauge glass apparently shows no water is clarified
7. Explain common hazards and defects and relevant prevention/ control procedures
   • Hazards and defects associated with auxiliary boilers are identified
   • How water hammer can be prevented in auxiliary boilers is outlined
   • Symptoms, causes, effects and actions to be taken in the event of oil contamination of boiler water are determined
   • Difference between and measures taken to avoid fire and water side explosions are clarified
   • Causes, mechanism, prevention and control of economiser fires are detailed

Range Statement

Specifies different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Range is restricted to essential operating conditions and any other variables essential to the work environment.
Mountings and fittings on auxiliary boilers include one or more of the following:	air release cock auxiliary steam stop valve blow down valve feed check or control valve main steam stop valve pressure gauge connection safety valves sampling connection scum valve water level gauge whistle stop valve
Hazards and defects include one or more of the following:	chemical hazards enclosed space illumination of work area machine guarding manual handling materials rubbish and combustible steam and fuel leaks thermal hazards trips

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

accessing information related to marine auxiliary boilers

assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices

explaining basic operation of marine auxiliary boilers

identifying and applying relevant solutions for addressing problems associated with marine auxiliary boilers

identifying and interpreting diagnostic information and performing mathematical calculations related to operating, maintaining and repairing marine auxiliary boilers

identifying methods, procedures and materials needed for operating, maintaining and repairing marine auxiliary boilers

imparting knowledge and ideas through verbal, written and visual means

providing accurate and reliable information

providing appropriate level of detail in responses

reading and interpreting manuals, technical specifications, safety data sheets/material safety data sheets and manufacturer guides related to operating, maintaining and repairing marine auxiliary boilers.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

basic principles of operation of boilers and steam systems

combustion in boilers and related safety procedures, including importance of purging a boiler and other safety precautions taken when firing a boiler

common boiler defects and repair procedures

fuel oil system for an auxiliary boiler

fittings mounted on boilers

hazards associated with running boiler plant

operating principles relating to steam generation in fired and unfired boilers

principles of boiler operation in normal and emergency situations

procedures for maintaining water level in boilers

purpose of alarms and shut downs in marine boilers

treatment, sampling and testing of boiler water

types of auxiliary boilers and typical operating pressures and temperatures

typical feed systems for marine boilers

work health and safety (WHS)/occupational health and safety (OHS) legislation, policies and procedures.

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