fmeca

FMECA of PUMP pumping water from Coalescer to second stage recycler and degasser

Ref No

1 motor winding failure

2 bearing failure

3 seal leakage

4 unbalancing of rotors

5 structural failure

6 flow rate/ pressue loss

FMECA of BLOWOUT PREVENTER (BOP)

Ref No

1

Potential failure modes


Failure to close on drill pipe throughannular

1

2

3

4

5

6

7

FMECA of Crane

Ref No

1

2

Failure to close on drill pipe throughannular

Failure to close on drill pipe through pipe

rams

Failure to seal or partial seal on drill pipe

through annular

Unintentional closing / opening Annulars

Choke & Kill lines stack Mechanical failure

Tubing and piping Subsea Control Hydraulic external leak or

mechanical failure

SPM Valve Double acting Subsea Control Hydraulic External or Internal Leak or Mechanical

Failure


Insufficient strength toprovide structural

support for theforces inacurred

during craneoperation

Unable to carry andmanoeuvre the

fright in a risk free andeffective mannerusing the boom

hoist system.

2

3

4

5

6

7

Unable to carry andmanoeuvre the

fright in a risk free andeffective mannerusing the boom

hoist system.

Vibrations in the sling while hooking because of heave

Unintentional closing / opening Annulars

Choke & Kill lines stack Mechanical failure

Tubing and piping Subsea Control Hydraulic external leak or

mechanical failure

SPM Valve Double acting Subsea Control Hydraulic External or Internal Leak or Mechanical

Failure


Potential causes Local effects of failure global effects of failure (P) Occurance

Over loading

2

Poor wire gradePower Supply Anomili

HumidityImproper Lubrication

Over heatingVibration

3

Improper LubricationCONTAMINATION

BrinellingMisalignment

CorrosionTight Fits

Accelerated seal face wear

4O-ring failure

Small leakageSeal embrittlement

pitting,3

cavitationdeposition

Impact loadingImmence leakage 1

Rustingimpeller degradation

Low Efficiency 3rotor missaligmentpoor lubrication



1

Instant stop of pumping

Water from the coalser will no more

be in closed loop rather it will be

flushed

Pressure/ Flowrate drop and can be

permanent shutdown

Before complete shutdown the

system would be very little effected

but on shutdown the recycling will

shutdown

Pressure/ Flowrate drop and process

area spillage

Process area can be dirty but negligible

effect on system cycle

Decrease in efficiency of pump, can result in overall

failure

Noise/vibration in process area

Complete stop plus spillage

Negligible effect on system/ access water

can be flushed

Failure of Control Signal to Annularor C&K Valves Oil Spillage,

Structure intergrity goes to plastic limit

state

Can result to messive oil spillage, field

shutdown for long time, platform fire

and sinking

1Inability to Operate C&K Valves

Failure to Close or open Annular

Failure to Close Pipe Ram

1

Failure to Open Pipe Ram on Demand

Failure of Annular to Seal on Demand1

Failure to Maintain Adequate Sealing

Unintentional Closing without control3

Impact loading1

RustingHydraulic sealing failure

3Diaphram leakageMechanical WearMechanical Wear

2Rusting

Seal Leakage

FMECA of Crane


1Weak anchoring

Loading above threshold

Hoist Winch brake failure

2Failure of locking mechanism

Failure of Control Signal to Annularor C&K Valves Oil Spillage,

Structure intergrity goes to plastic limit

state


shutdown for long time, platform fire

and sinking

Oil Spillage, Structure intergrity goes to plastic limit

state


shutdown for long time shutdown,

platform fire

Failure to Supply Hydraulic Fluid & Pressure to pipe ram

Messive Oil Spillage, Enviroment Pollution



platform fire

OIl Spillage, Process hault

Production Stop, Hydrocarbons

spillage, EnvirnmentUnintentional Opening without any acquated signal from control system


Huge maintenance involved, Production hault plus spillage

Relatively less oil spillage

Maintenance Involved and

production stop



production stop

Framestructure fail because

of metal fatigue Frame, boom or anchor fracture and failure of load being

carried

Injury or fatality of the person on site,

platform facilities or equipment damage

multi-plate disc lock mechanism

that is used as locking brake

only, pawllock acctuated

mover is stopped

Platform deprived from rigging facility

2

Failure of Annular to Seal on Demand1

Failure to Maintain Adequate Sealing

Unintentional Closing without control3

Impact loading1

RustingHydraulic sealing failure

3Diaphram leakageMechanical WearMechanical Wear

2Rusting

Seal Leakage

multi-plate disc lock mechanism

that is used as locking brake

only, pawllock acctuated

mover is stopped

Platform deprived from rigging facility

Messive Oil Spillage, Enviroment Pollution



platform fire

OIl Spillage, Process hault

Production Stop, Hydrocarbons

spillage, EnvirnmentUnintentional Opening without any acquated signal from control system


Huge maintenance involved, Production hault plus spillage



production stop



production stop


(S) Severity (D) Detectability Risk Level P*S*D

2 1 5

1 2 5

1 2 6

2 3 9

3 1 4 Scheduled Checks

1 3 6


(S) Severity (D) Detectability Risk Level P*S+D

6 6 36

Mitigation / Requirements

Circuit should be fused, Fully

insulated, Regulated Power Supply

Preventive Maintenance


Conndition Monitoring



Designed with higher safety factors and

have redundency if possible

6 6 36

6 5 30

5 5 25

4 4 48

4 4 16 Scheduled checks


3 4 24

FMECA of Crane

(S) Severity (D) Detectability Risk Level P*S+D

6 5 30

4 4 32









Fatigue life inspection of crane after two years and inspection of local

cracks

Scheduled inspection of internal parts, x-

ray immaging can be used for microscopic

crake detection

4 4 32

5 5 25

4 4 48



3 4 24

Scheduled inspection of internal parts, x-

ray immaging can be used for microscopic

crake detection




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