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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
Q

Hydrodynamic Lubrication

A

Two surfaces separated by an unbroken lubricant film. Viscosity provides wear protection. Additives have little value.

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26
Q

Elasto-Hydrodynamic Lubrication

A

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.

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27
Q

Boundary Lubrication

A

Occasional metal-to-metal contact takes place between surfaces; almost entirely dependent on additives to provide protection.

28
Q

Bathtub Curve

A

Infant Mortality
early decreasing failures

Constant / useful life / random causes
Long duration of normal operations and random failures

Wear out stage, increased failures

29
Q

infant Mortality

A

poor manufacturing
poor installation
misapplication

30
Q

Motor Current Signature Analysis

A 
Motor foundation
Belt defects
Circuitry breakdown or degrade
Rotor eccentricity
Rotor damage
Power quality disturbances
31
Q

Fast Fourier Transform

A

converts a signal from its original domain to a representation in the frequency domain and vice versa

32
Q

5 stages of team building

A

Forming, Storming. Norming, Performing, Adjourning

33
Q

Inventory

A

goods and materials for the ultimate goal of resale, production or utilization

34
Q

Forming

A

team build stage one:
excitement, anticipation, anxiety, optimism, safe topics and formal-reserved

Leader: Drive effective communication

35
Q

Storming

A

team build stage 2:
resistance, conflict, competition, high emotions, lack of participation

Leader: Remind and center on goals

36
Q

Norming

A

team build stage 3:
reconciliation, cohesion, reduced anxiety, shared goals, engage, support

Leader: Re-center on goals

37
Q

Performing

A

team build stage 4:
productive, effective, trust, independence, balanced task and process, teamwork

Leader: stand back and orchestrate

38
Q

Adjourning

A

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
Q

Inventory

A

goods and materials for the ultimate goal of resale, production or utilization

40
Q

Quantitative Inventory Management

A

How much to order; EOQ

When to order; ROP

41
Q

Lead Time

A

duration between ordered and delivered

42
Q

Why Maintain Inventory

A

Lead Time
Uncertainty
Economies of scale

43
Q

Uncertainty of supply

A

demand and market variables might be disrupted

44
Q

Economies Of Scale

A

cost advantages from scale of operation according to output decreasing in cost per unit

45
Q

Raw Material

A

ore, grain, minerals, fuel, chemicals, paper, wood, paint, steel, food, etc.

46
Q

Work in Process

A

between raw materials and finished product

drive train, engine, frame, body

47
Q

Economies Of Scale

A

cost advantages from scale of operation according to output enabling large inventory and decreasing cost per unit

48
Q

MRO Goods

A

support process but not included in customer product

49
Q

Economic Order Quantity

A

order quantity to minimize inventory cost

50
Q

Order Quantity

A

units added to inventory per order

51
Q

Total Inventory Cost

A

acquisition cost (shipping etc.) + purchase price + holding cost

52
Q

Ordering Cost

A

purchase price of unit

53
Q

Holding Cost | Carrying Cost

A

warehousing, obsolescence, etc.

54
Q

ReOrder Point (ROP)

A

the forecast usage during the replenishment Lead Time plus safety stock

55
Q

Pareto Principle

A

20% of X = 80% of impact

56
Q

Vital Few

A

Pareto 20% high impact components

57
Q

Trivial Many

A

Pareto 80% low impact components

58
Q

ABC Inventory Classification

A

A: 20% inventory | 80% value or impact
B: 30% inventory | 15% value or impact
C: 50% inventory | 05% value or impact

59
Q

ABC Inventory Features

A

A: exact count | Senior MNGRs | quarterly
B: estimate count | Mid-MGRs | X per year
C: inexact count | Staff | annual or less

60
Q

ABC in Enel SAP

A

A: ZSSP
B: ZVAL
C: ZNSM

61
Q

Life Data Analysis (Weibull)

A

probability of failure determination

62
Q

Constraints on Maintenance & Reliability

A

Culture / People / Resources

63
Q

P-F Curve / Interval

A

graphed failure curve from before detection is possible through detection phase to functional failure

64
Q

Inherent Availability

A

includes only active repair time. It does not include preventive maintenance time and administrative or logistic delays, but does include corrective maintenance downtime

65
Q

Operational Availability (Ao)

A

MTBM / (MTBM + MDT) Where MTBM = Mean Time Between Maintenance
and
MDT = Mean Down Time

Maintenance Reliability (3 decks)

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