Use Basic Fluids in Engineering




This unit covers the competency to solve problems relating to fluids involving hydrostatics, conservation of energy and conservation of momentum.


40 hours

Employability skills

The required outcomes described in this unit of competency contain applicable facets of Employability Skills.

The Employability Skills Summary of the qualification in which this unit of competency is packaged will assist in identifying Employability Skills requirements.

Pre-requisite units



This unit applies to technician level activities in a civil engineering environment.





Elements describe the outcomes of a unit of competency.


Performance Criteria specify the level of performance required to demonstrate achievement of the Elements. Terms in italics are elaborated in the Range Statement.

1. Relate fundamental properties

to fluid characteristics.

1.1.     Define fundamental properties of a fluid

1.2.     Relate appropriate properties to each other

1.3.     Calculate properties of fluids through the definitions

2. Solve manometer problems

2.1      State pressure formula.

2.2      Explain the principle of the hydraulic jack.

2.3      Calculate the load that can be lifted by a hydraulic jack

2.4      Solve U tube manometer problems

2.5      State advantages and disadvantages for various pressure measuring devices.

3. Use the energy approach to solving flow measurement problems

3.1      Classify and explain the various types of fluid motion

3.2      Utilise the continuity equation in solving fluid mechanics problems

3.3      Use Bernoulli’s equation to solve fluid flow problems

3.4      Use Bernoulli’s equation to determine the theoretical discharge through a flow measuring device.

4. Solve impact of jets type problems.

4.1      State Newton’s second law.

4.2      Manipulate the momentum equation to calculate the forces on flat plates of various inclinations and relative velocities.

4.3      Determine the forces on vertical and horizontal bends in a pipeline.




This describes the essential skills and knowledge and their level required to complete this unit.


Essential knowledge:

  • Definitions of the properties of a
  • Formula for pressure in a fluid
  • Formula for the continuity equation
  • Bernoulli’s equation
  • Momentum equation



Essential skills:

Ability to:

  • Determine pressures and/or flow rates at various points in a fluid
  • Determine forces acting on various components of a fluid system
  • Determine coefficient of discharge or develop calibration graphs for various flow measurement devices.





The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Add any essential operating conditions that may be present with training and assessment depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts.

fundamental properties may include

·         Mass density, weight density, relative density

·         Kinematic viscosity, dynamic viscosity

·         temperature

U tube may include

·         upright and inverted U tubes

·         multiple fluids

energy approach may include

·         pressure head

·         velocity head

·         position head

types of fluid motion may include

·         laminar and turbulent flow

·         steady flow

·         uniform flow

a flow measuring device may include

·         venturi meter

·         orifice meter

·         rotameter

·         pitot tube and a pito-static tube





The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria, Required Skills and Knowledge, the Range Statement and the Assessment Guidelines for this course.

Critical aspects of assessment and evidence required to demonstrate this competency unit:

·         Select appropriate pressure measuring instruments for various applications.

·         Correctly determine loads that can be supported by a hydraulic jack.

·         Correctly determine flow rates and/or pressures at critical points in a fluid system.

·         Correctly determine the forces acting on components in a fluid system.

·         Correct use of units is maintained in all calculations.

·         Reports relating to testing of fluid systems are documented in an appropriate industry format.

Access and equity considerations:

The assessment environment should not disadvantage the candidate.

Context of and specific resources for assessment:

This unit may be assessed on the job, off the job or a combination of both on and off the job. Where assessment occurs off the job, that is the candidate is not in productive work, then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations. The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team.

Method of assessment:

Assessors should gather a range of evidence that is valid, sufficient, current and authentic.

Evidence can be gathered through a variety of ways including direct observation, supervisor’s reports, project work, samples, questioning, workplace-supervised practicals, remote labs, simulations, video, assignments, quizzes, scenario participation, e-portfolios and other techniques as required.

Questioning should not require language, literacy and numeracy skills beyond those required in this unit.

The candidate must have access to all tools, equipment, materials and documentation required and must be permitted to refer to any relevant workplace procedures, product and manufacturing specifications, codes, standards, manuals and reference materials.


Software/Hardware Used