koomey accumulator

8/19/2019 Koomey Accumulator

http://slidepdf.com/reader/full/koomey-accumulator 1/7

CONVENTIONAL

BOP

CONTROL

SYSTEM

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KOOMEY

INC.

BLOWOUT

PREVENTER

CONTROLS

SIZING

CONVENTIONAL

BOP

CONTROL

SYSTEMS

MINIMUM

RECOMMENDATION.

The

KooMEY

INc.

approach

to

correct

sizing

of Accumulator

Units

is

to

provide

ample

accumulator

capacity

(fluid

stored

under

pressure)

to immediately

controlthe

prevent-

ers

during

an emergency.

The

pumps

are

designed

to

charge

these

accumulators

within

a reasonable

time

period,

and

to

maintain

this

charge,

as

pres-

sure is

used

to control

the preventers.

The

follow-

ing

steps

for

sizing

the

BOp

Control

System

and

selecting

the

appropriate

model

numbers

have

been

prepared

to assist you

in

correcfly

selecting

a

safe

and reliable

BOP

Control

System.

SIZING

ACCUMULATOR

VOLUME

The

total

accumu-

lator

volume

for

a

3000 psi

BOP

Control

System

should

be

sized

to fully

dose

the

annular

and

all iLam

prevent-

ers

with

the

pumps

out

of

service

while

maintaining

a

minimum

of

1200

psi

operating

pressure (200

psi

above

precharge).

An

addition

al SOVa

safety

facror

is required

to

compensate

for

any

fluid

loss

in

the

Control

System

or

Prevenlers.

Step

1:

Determine the total

gallons

to

close

the

prevent-

ers.

Refer

to the

quick reference

tables

on

pages

12

thru

14.

Step

3:

Determine

the

number

of

accumulators

re-

quired

by

dividing

rhe

roral

accumulator

volume (nit-

Iogen

and

fluid)

by

the

nominal

accumularor

capacity.

The

nominal

accumulatrtr

capacity

is

the

accumulator

size

in

gallons,

less

I

gallon

to

allow

for

bladder/float

displacemenr.

EXAMPLES

_

USING

11

GALLON

ACCUMULATORS

Total A6umulator

Volume

Nominal

Accumulator

Capacity

('11

-.1

=10)

Number

oI Eleven

Gallon

Amumulators

Total

Accumulalor

Volume

EXAMPLE

Total

Accumulator

Volume (Step

2)

Actual

Fluid

Capacity Factor

Total

Actual Fluid

Capacity

Divide

by

'15

Minules

TOTAL

GPM

REQUIHED (EACH

PUMP)

107.52

+10.0

'10.75

or

11

l1O

Gallons

110

callons

x

.67

Gallons

73.7

Gallons

+

15

Minutes

4.9

Modet

Number

MBliGltST

Accumutator

Unit

SIZING

AIR

AND

ELECTRIC

PUMPS

Each

pump

source

for

a

3000

psi

Conventional

BOp

Control

Sys-

tem

should

be

capable

of charging

the

entire

system

accumulator

capacin.from

0 to

8000

psi in

fifteen

min-

utes

or less.

The

Control

System

should

include

two

independentlv

porvered

pump

sources.

Step 4: Determine

the

required

pump

GpM

by

mul-

tiplying

the

total

accumularor

volume (obtained

in

Step

2) by

.67 (rhe

acrual

fluid

capacity)

and

divide

by

l5

minutes:

l

i

-i

I

lL

I

)

:]

l

i

;,1

exceed

the

following

requirements:

Total

Gallons

to

Close

50'/"

SaIety

Factor

Total

Gallons

oI

Usable

Fluid Required

(VR)

35.84

-t7.92

53.76

Step

2;

Calculate

rhe

toral

accumulator

volume

(nitro_

gen

and

fluid)

required

(derived

from

Boyle,s

Law,

Step

5: Select

the

pump

model

numbers

each

with

a

pump

ourpur

grearer

than

the

total

GpM

required

1bo"::

Refer

to

the

quick reference

table

on

page

20.

fee

A,rl Pumps

(page

39)

and

Etectric

pumps

(page

a2)

for

additional

specifications.

*NOTE:

Air

Pump

ourpur

is

based

on

125

psi

air

input

to

the

air moror

and rhe

ourpur

ar

2000 psi

IZOOO

pri

i.

the

average

rare

berrveen

the

1000

psi

prechargeand

the

3000

psi

operating

pressure).

Koomey

lnc.

does

not recommend

air

pump

ratios less

than

50:1 .

Rig air

pressure

may

drop

as low

as

60

psi

under

normal

operating

conditions

which

would

not

allow

lower ratio

pumps

to attain

the

requiEd

3000

psi

output.

Koomey

lnc.

also

does

not recommend

air operated

pumps

with

10 inch

or

larger

air motors.

Each

of these

motors

require

300

SC'FM

or more

air

supply

to

maintain

the

3000

psi

operating

pressure.

The

combined

air

demand

of two

orthree

of these

pumps

wouid

often

exceed

the

available

air

supply

of

many

floating

drilling

rigs.

EXAMPLE

uA7326-M

UEI15HM46O

Air Pump

Assy.

Electric

Triplex

7.2

*

6.4

,

(3000 psi)

%

=

Minimum

operatins

] I t\-4

3000psi

P1V1

:

P2V2):

P,

-

Marimum

presrre

ot

I

T

I

accumulator

when

complstelycharged

Vl

liXlll',"?1,,,,000",,

ir,

I ll

itrogenprecharge6

V"

J I

^

I

V.

=

Volume

ot nitrogen

al

milimum

pressure

V,

- Volumeof

nitrogen

at

minrmum

pre$ure

{

v,-votumeofnitrogenar

I /

I

mrnrmum pre$ure

I\-r4

.

v3=Totalaccumutatorvotumeol I ^

l1200psi

Maximumpre$ure"

I Tl

accumulator

when

complstetycharged

Vl

(3000

psi)

I

Minimumoperatrng

] ]

I

prossure

ol

I

accumutator (1200

psi)

I

V,

ccumutator(12oopsi)

1"2 I I

I

P3:Nitrogenprecharsed

V"

] I _ I

I

pressur6(10oopsi)

i I

re

lV":V,

V,

f

f

d

,

m

h

m

;

(nitrogen

and ftuid)

VH

=

Total

usable

flu,O

'

required

including

safety

tactor

1

000psi

,,

vF

$.76

P"

%

:

looo

looo

:1o752or11ogallons

P2

P

1200

30OO

Ouick

calculation

-

muttipty ga[ons

to close

ail

prcyenters

by 3. 35.84

x

3

=

107.52

EXAMPLE

The

total

system

accumulator

capacity

should

meet

or

Annular

Pipe

Ram

Bltnd

Ram

5,000

psi

10,000

psi

10,000

psi



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5330

KOOMEY

INC.

MAINTENANCE

A

regularly

scheduled

maintenance

program

must

be

developed

to

suf_

ficiently

mainrain

the BOp

Control

System

Accumulator

unit

and

panels.

The

operator

must

develop

an

appropriate

maintenance

pro-

gram

based

on

his

operating,

testing

and

drilling

programs.

All

maintenance

and

repairs

con-

ducted

around

high

pressure

and

MAI

NTENANCE

INSTRUCTIONS

ACCUMULATOR

UNIT

electrical

equipment

rnust

be

clone

carefully

to

ensure

the

saf-ety

of

all

personnel.

Whcn

repairing

or

re_

placing

components,

all

pressure

and

electrical

supply

should

be

removed

from

the

system.

When

working

with

electrically

powered

tools, ensure

that

they are

grounded

and

that

the

handles

are insulated.

The

followins

maintenance

in_

structions

should

be

used

as a

in

developing

a

comprelrr

maintenance

program.

Thi:

gram

should

include

a

maint

log

to

document

all

mainte

activities.

All

maintenance

s

be

conducred

by

qualified

nance personnel

who are

I

with

the

normal

operationaj

acteristics

of

the

equipment.

SEE PAGE

45 FOR

INFORMATION

ON THE

NEWTR

REGULATOR

m

iln

rh

TYPICAL

CONVENTIONAL

ACCUMULATOR

UNIT

WTH

AJR

AND

ELECTRIC

PUMP

ASSEMBI-IES

AND

A HYDRAULIC CONTROL MANIFOLD.

Item

numbers

refer

to text

on the

following

page.



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