BTEC HIGHER NATIONALS- APPLIED PNEUMATICS AND HYDRAULICS H1
FLUID POWER STANDARDS
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Assessment Criteria for a pass Achieved
• Recognise and describe given fluid power symbols.
• Review fluid power diagrams and report on the design
Investigate fluid power of either a pneumatic or hydraulic multi-actuator
diagrams sequential operation using a minimum of four
• Review fluid power diagrams and report on the design
of either a pneumatic or hydraulic reversible rotary
actuation with speed control in both directions.
• Identify and describe the features of given items of
OUTCOME 2 pneumatic and hydraulic equipment.
• Analyse the performance characteristics of given
Analyse the construction and pneumatic and hydraulic equipment.
operation of pneumatic and
equipment and plant.
• Design and draw either a circuit for either a pneumatic
OUTCOME 3 or hydraulic multi-actuator sequential operation,
including emergency stop functions.
Design pneumatic and • Design and draw either a hydraulic or pneumatic rotary
hydraulic circuits actuation circuit illustrating speed control in both
• Design and draw either an ‘electro-pneumatic’ or
‘electro-hydraulic’ circuit arrangement.
• Design and draw an emergency ‘fail safe’ circuit for
either a pneumatic or hydraulic application.
• Justify the use of fluid power technology for a given
OUTCOME 4 industrial application.
• Describe the technical requirements and commercial
Evaluates industrial aspects for a proposed system.
applications of pneumatics • Identify appropriate health safety requirements for the
and hydraulics design, installation, maintenance and use of fluid
• identify and apply • effective judgments have been made
strategies to find • complex problems with more than one variable have been
appropriate solutions. explored
• an effective approach to study and research has been
• select/design and apply • relevant theories and techniques have been applied.
• a range of methods and techniques have been applied.
• a range of sources of information has been used.
• the selection of methods and techniques/sources has been
• the design of methods/techniques has been justified
• complex information/data has been synthesized and
• appropriate learning methods/techniques have been
• present and • the appropriate structure and approach has been used
appropriate findings • coherent, logical development of principles/concepts for
• a range of methods of presentation have been used and
technical language has been accurately used
• communication has taken place in familiar and unfamiliar
• the communication is appropriate for familiar and
unfamiliar audiences and appropriate media have been
• use critical reflection • conclusions have been arrived at through synthesis of
to evaluate own work ideas and have been justified
and justify valid • the validity of results has been evaluated using defined
• self-criticism of approach has taken place
• realistic improvements have been proposed against
defined characteristics for success
• take responsibility for • autonomy/independence has been demonstrated
managing and • substantial activities, projects or investigations have been
organising activities planned, managed and organised
• activities have been managed
• the unforeseen has been accommodated
• the importance of interdependence has been recognised
• demonstrate • ideas have been generated and decisions taken
convergent/lateral/ • self-evaluation has taken place
creative thinking • convergent and lateral thinking have been applied
• problems have been solved
• innovation and creative thought have been applied
• receptiveness to new ideas is evident
• effective thinking has taken place in unfamiliar contexts
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GENERAL INTRODUCTION TO ASSESSMENT STATEGY
Throughout the module you should do the following.
• Study relevant course notes.
• Study the recommended textbooks.
• Use the standards publications available in the library.
• Make use of suitable web sites.
• Make use of journals on fluid power stored in room B1
• Make use of manufacturers catalogues. (RS, NORGREN, REXROTH and so on stored in rooms B1
• Make use of the standard information pack from the British Fluid Power Association.
In the design parts, you should use the computer software “PneuSim Pro”. The context help contains
diagrams, pictures and symbols.
Your assignment should be structured with headings and subheadings. The work must be your own. Copies
of pages from the internet or from any other source should only be added as reference material. This should
be clearly identified and cross-referenced in your text (e.g. diagram numbers and appendix numbers).
You may use computer packages such as “word” to produce your work and scan in pictures. You may do the
work in hand writing and paste in pictures and diagrams. What ever method you use, make sure that the work
is identifiable as your own unique style and your research.
PART 1 HARDWARE AND BASIC CIRCUITS
Part 1 is made from a series of worksheets that enable you to demonstrate knowledge and ability of hydraulic
hardware and circuits. It also includes some work on pneumatics.
You should have each worksheet verified and marked as soon as you complete them. On completion of all
the work, you should present all the worksheets to your lecturer in a portfolio for grading. Guidelines of
grading are also given on each worksheet where appropriate.
THE WORKSHEETS BELOW HAVE BEEN INCORPORATED IN THE TUTORIALS AS SELF
W.S.1 INTRODUCTION TO FLUID POWER
W.S.2 HYDRAULIC PUMPS AND MOTORS
W.S.3 DIRECTIONAL CONTROL VALVES
W.S.6 FILTERS, FLUIDS, SEALS AND POWER PACKS
PART 2 AIR COMPRESSORS
NOTE: If you have completed the section on air compressors in the Thermodynamics module, you may
claim exemption from part 2.
A reciprocating air compressor has an ideal cycle as shown. You will be allotted a set of data from the list
1. The work done per cycle.
2. The work done per second (power).
3. The volumetric efficiency
4. The isothermal efficiency.
5. The Free Air Delivery.
The induction is carried out at atmospheric pressure taken
as 100kPa. You will need to determine the volume at
point 4 of the cycle in order to complete this section.
⎛ n ⎞ ⎧ n −1 ⎫
Work done per cycle W =⎜ ⎟ p1 ⎨rp n − 1⎬[V1 − V4 ]
⎝ n −1⎠ ⎩ ⎭
Isothermal work done per cycle W = l n ⎜ 2 ⎟( p1V1 − p3V3 )
Compression process p 2V2n = p1V1n
Expansion process p3V3n = p 4V4n
Other formulae may be found in your notes.
STUDENT V1 dm3 V3 cm3 p1 kPa p2 kPa n N rev/min.
1 1 60 100 400 1.2 400
2 0.9 50 100 500 1.25 360
3 1.5 100 100 450 1.28 450
4 2 120 100 550 1.3 500
5 0.8 40 100 600 1.18 600
6 1.5 120 100 300 1.22 420
7 1.2 90 100 350 1.27 460
PART 3 THE PIPE-WORK SYSTEM
The air from the compressor is stored in a tank. The tank supplies air to a main pipe. Assuming a maximum
velocity in the pipe of 8 m/s, determine a suitable pipe bore to carry all the air produced by the compressor.
Explain how the air would be distributed to user points in the workshop and the equipment needed to ensure
that it is supplied in a fit state for use.