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Maintenance Reliability > Terms > Flashcards

Terms Flashcards

1
Q

Failure Rate λ

A

number failures over time

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2
Q

Availability

A

probability (%) a component will operate on demand

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3
Q

Benchmarking

A

compare to similar

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4
Q

Manufacturing Process Reliability

A

the probability of a process to operate without failure

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5
Q

Fault Tree Analysis

A

top down analysis of major event caused by minor events

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6
Q

Fault Probability

A

probability of fault occurring from FTA

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7
Q

Reliability Block Diagram

A

probability of successful outcome

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8
Q

Failure Mode Effects Analysis

A

What could fail and how it affects the process?

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9
Q

Risk Priority Number

A

in FMEA

Severity * Occurrence * Detection

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10
Q

Tribology

A

the science and engineering of interacting surfaces in relative motion; friction, lubrication, wear

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11
Q

Friction

A

resistance to motion

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12
Q

Wear

A

loss of material; abrasive wear, contact fatigue, corrosion

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13
Q

Lubrication

A

control of a friction using a friction reducing film

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14
Q

Oil Analysis

A

Fluid properties:

Viscosity, TAN, TBN, Elemental Analysis

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15
Q

Total Acid Number

A

a measurement of acidity that is determined by the amount of potassium hydroxide in milligrams
non-crankcase

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16
Q

Total Base number

A

measure of alkaline concentration present in a lubricant

crankcase

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17
Q

Elemental Analysis

A

Elemental analysis is a process where a sample of some material is analyzed for its elemental and sometimes isotopic composition (AES)

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18
Q

Fluid Contamination

A

What is in the oil

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19
Q

Wear Debris

A

What is the debris from?

Is this normal?

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20
Q

Fourier Transform Infrared

A

infrared detection method for oil contamination; fuel water glycol soot

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21
Q

Atomic Emission Spectroscopy

A

detects metals, contaminants, additives

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22
Q

Rotating Disk Electrode

A

particles < 8-10 microns

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23
Q

Inductively Coupled Plasma

A

particles < 3 microns

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24
Q

ISO 4406

A

particle size & quantity in oil
particle sizes (microns) 4 / 6 / 14
ISO code 16 / 14 / 11 is a good standard
ISO code 25 / 22 / 19 is common in new oil

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25
Hydrodynamic Lubrication
Two surfaces separated by an unbroken lubricant film. Viscosity provides wear protection. Additives have little value.
26
Elasto-Hydrodynamic Lubrication
Sudden reduction of film causes a temporary increase in viscosity; the film can become rigid, temporary elastic deformation of the surfaces. Viscosity and additives protect surfaces.
27
Boundary Lubrication
Occasional metal-to-metal contact takes place between surfaces; almost entirely dependent on additives to provide protection.
28
Bathtub Curve
Infant Mortality early decreasing failures Constant / useful life / random causes Long duration of normal operations and random failures Wear out stage, increased failures
29
infant Mortality
poor manufacturing poor installation misapplication
30
Motor Current Signature Analysis
``` Motor foundation Belt defects Circuitry breakdown or degrade Rotor eccentricity Rotor damage Power quality disturbances ```
31
Fast Fourier Transform
converts a signal from its original domain to a representation in the frequency domain and vice versa
32
5 stages of team building
Forming, Storming. Norming, Performing, Adjourning
33
Inventory
goods and materials for the ultimate goal of resale, production or utilization
34
Forming
team build stage one: excitement, anticipation, anxiety, optimism, safe topics and formal-reserved Leader: Drive effective communication
35
Storming
team build stage 2: resistance, conflict, competition, high emotions, lack of participation Leader: Remind and center on goals
36
Norming
team build stage 3: reconciliation, cohesion, reduced anxiety, shared goals, engage, support Leader: Re-center on goals
37
Performing
team build stage 4: productive, effective, trust, independence, balanced task and process, teamwork Leader: stand back and orchestrate
38
Adjourning
team build stage 5: team breakup, feeling of loss, reflect on accomplishment Leader: official citations in participants official records, recommendations to participant's Managers.
39
Inventory
goods and materials for the ultimate goal of resale, production or utilization
40
Quantitative Inventory Management
How much to order; EOQ | When to order; ROP
41
Lead Time
duration between ordered and delivered
42
Why Maintain Inventory
Lead Time Uncertainty Economies of scale
43
Uncertainty of supply
demand and market variables might be disrupted
44
Economies Of Scale
cost advantages from scale of operation according to output decreasing in cost per unit
45
Raw Material
ore, grain, minerals, fuel, chemicals, paper, wood, paint, steel, food, etc.
46
Work in Process
between raw materials and finished product | drive train, engine, frame, body
47
Economies Of Scale
cost advantages from scale of operation according to output enabling large inventory and decreasing cost per unit
48
MRO Goods
support process but not included in customer product
49
Economic Order Quantity
order quantity to minimize inventory cost
50
Order Quantity
units added to inventory per order
51
Total Inventory Cost
acquisition cost (shipping etc.) + purchase price + holding cost
52
Ordering Cost
purchase price of unit
53
Holding Cost | Carrying Cost
warehousing, obsolescence, etc.
54
ReOrder Point (ROP)
the forecast usage during the replenishment Lead Time plus safety stock
55
Pareto Principle
20% of X = 80% of impact
56
Vital Few
Pareto 20% high impact components
57
Trivial Many
Pareto 80% low impact components
58
ABC Inventory Classification
A: 20% inventory | 80% value or impact B: 30% inventory | 15% value or impact C: 50% inventory | 05% value or impact
59
ABC Inventory Features
A: exact count | Senior MNGRs | quarterly B: estimate count | Mid-MGRs | X per year C: inexact count | Staff | annual or less
60
ABC in Enel SAP
A: ZSSP B: ZVAL C: ZNSM
61
Life Data Analysis (Weibull)
probability of failure determination
62
Constraints on Maintenance & Reliability
Culture / People / Resources
63
P-F Curve / Interval
graphed failure curve from before detection is possible through detection phase to functional failure
64
Inherent Availability
includes only active repair time. It does not include preventive maintenance time and administrative or logistic delays, but does include corrective maintenance downtime
65
Operational Availability (Ao)
MTBM / (MTBM + MDT) Where MTBM = Mean Time Between Maintenance and MDT = Mean Down Time

Maintenance Reliability (3 decks)

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