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Met

h

anol O

p

erations

BOS-

P

RD-2

6

.900

6

09

4

.

2

.

4 L

oa

d

in

g

Met

h

anol

Loading methanol

Moor

a

l

on

g

s

i

de

the

supp

li

er

or

ho

l

d

re

l

at

i

ve pos

i

t

i

on on

D

P

i

f

app

li

cab

l

e

.

Ma

k

e

sure

the

supp

li

er

i

s

aware

of

the

q

uant

i

ty

to

de

li

ver

to

avo

i

d

overf

l

ow

.

Conse

q

uences

cou

l

d

be

d

i

sastrous

.

H

i

g

h

l

eve

l 9

5

%

a

l

arm

shall

be

chec

k

ed before

the

operat

i

on

.

D

oub

l

e

chec

k

P

V

va

l

ves

are operat

i

ona

l.

Connect

the methano

l l

oad

i

n

g

hose

.

T

he methano

l l

oad

i

n

g

hose

should

be f

ill

ed w

i

th

n

i

tro

g

en

by

the

supp

li

er

(

chem

i

ca

l

tan

k

er

,

shore

i

nsta

ll

at

i

on

…)

who

b

l

ows

the

li

ne

at

the

same

t

i

me

to ma

k

e

sure

there

’

s

no obstruct

i

on on

the

system

.

T

here

should

not

be

any

pressure when

the

tan

k i

s

empty and w

i

th m

i

n

i

mum

l

oad

i

n

g

rate

. I

n

any

case

, i

f

the

pressure

r

i

ses

on

the

system

, i

t means

that

there

i

s

an

obstruct

i

on

further

on

the

li

ne

to

the

tan

k,

or

P

V

va

l

ve

i

s

stuc

k

ed

c

l

osed

.

U

sua

ll

y

,

tan

k

s

are

l

oaded

8

5

%

of methano

l. B

r

i

d

g

e mon

i

tors

tan

k l

eve

l

g

au

g

e

.

S

tart

at m

i

n

i

mum

rate

,

around

1

0

m

3/

h

,

and

i

ncrease

pro

g

ress

i

ve

l

y

to ma

xi

mum

rate

(

1

20

m

3/

h

i

s

usua

ll

y

the

rate

bared

by

supp

l

y

vesse

l

s

).

M

i

n

i

mum

rate

should

be

k

ept

the

t

i

me

necessary

to

be

confortab

l

e

w

i

th

the

l

oad

i

n

g

and a

ll

safety

chec

k

s

.

T

he pressure

va

l

ve may

rema

i

n

s

li

g

ht

l

y opened at

t

i

mes

because

of

i

ncrease

of

pressure

i

ns

i

de

the methano

l

tan

k.

Ma

k

e

sure

the

pressure

va

l

ves

are

not

stuc

k

ed

i

n

opened

pos

i

t

i

on

,

th

i

s

wou

l

d

resu

l

t

i

n

waste

of

n

i

tro

g

en

. I

ndeed

, i

f

the

P

V

va

l

ve

rema

i

ns

opened

,

the

pressure

drops

to

0

bar

and

i

t

becomes

necessary

to

f

ill

w

i

th

add

i

t

i

ona

l N2

to

compensate

the

l

oss

of

pressure

. T

h

i

s

compensat

i

on

,

automat

i

ca

ll

y

done at

the

P

V

Va

l

ve

li

ne

, i

s

ca

ll

ed padd

i

n

g

.

Vers

i

on

S

F

(BOS-

P

RD-0

7

.900

6

09-

ver

.0

4

). O

r

i

g

i

na

l

date

: 22

/

0

6/

20

1

2.

Vers

i

on

date

:

31/1

2

/

20

15

.

Va

li

d

vers

i

on

on

l

y

on

Q

M

S

s

i

te

.

U

ncontro

ll

ed

document

when

pr

i

nted

.

P

rocedure prepared by

: BOS

H

ead

of

O

perat

i

ons

.

Approved

by

: BOS

H

ead

of

O

perat

i

ons

.

Va

li

dated by

: BOS

Q

ua

li

ty

R

epresentat

i

ve

.

1

0

/ 15

500