Six-point Technique - Maintenance
Six-point Technique
Six point technique
Visual examination
• Examine gather and analyse visual evidence of the plant or process that isn’t operating or functioning correctly.
Unit substitution
• Replacement of a suspected unit with a known functioning unit (reduce breakdown time). However; this practice could cause further complications in the repair of the plant or process.
Injection and sampling
• Location of a defect or fault found through inserting known data signals or functions at selected test points of the system or process.
• Taking samples data signals or operational functions at selected test points and comparing the measurements or results against known commissioning of operational values.
Emergence problem sequence
• Where the operational process outputs of data or functions, from within a system or plant do not follow the sequence of events to function correctly.
Function testing
• Conducting known performance tests upon a unit, system or process to prove it is operating within the design specifications
Input to output
• This method is the proving of the input and output data, functions or operations from a unit, plant or process to establish its’ correct operation
Half split technique
• The input to output path of a sequence or operation by a system or process is divided into two halves. Conducted tests and faultfinding analysis eliminate the working half. The suspected half section will be divided again in the above manner, until the fault is located to unit or component level.
Use of self-diagnostic
• Some process systems or industrial machinery have designed into their build specifications, self-diagnostic faultfinding equipment. This equipment could provide constant monitoring, preventive fault warning and fault location. In addition a maintenance aid to fault-finding.
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Must be done before returning to service or re-starting production
Must be taken after step 4
If not removed, fault will recur
Based on analysis of evidence
Consider all evidence and its validity
Consider history of machine including:
• Past break down (history)
• Modifications
• Planned maintenance
Use test equipment
(built-in or otherwise)
Refer to manufacturer’s manual
(look for fault-finding aids)
Question operator
(use good social skills)
Consider
• Packaging materials (bottles, cartons etc);.
• Raw materials (eg effects of water on machinery).
• Overall process (changes to).
Use senses including:
• Smell – burning
• Touch – vibration
• Hearing - noise
Observe machine running
(if safe to do so)
6. Check the machine or system
5. Rectify the fault
4. Determine and remove the cause
3. Locate the fault
2.Analyse the evidence
1.Collect the evidence
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