蒸汽裂解

ONIS Line Blinds reduce downtime and increase safety during decoking processes

TYPICAL STEAM CRACKER PROCESS SCHEME

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Steamcracker

SOME TYPICAL ONIS LINE BLIND SPECIFICATIONS

DESIGN DATA

MEDIA

SIZE

RATING

T(°F)

P (psig)

Decoke air

6” to 8”

150# to 300#

190 to 650

125 to 175

Gas feed

6” to 12”

150# to 300#

170 to 240

160 to 250

Liquid feed

3”

300#

320

260

Nitrogen

1” to 3”

150# to 300#

150 to 250

130 to 430

Steam

1”

300#

360 to 450

320

Quench oil

2’’ to 16’’

150# to 300#

70 to 500

190 to 320

 

 

 

 

 

 

 

 

 

 

 

 

 

DECOKING PROCESS WITHOUT ONIS IS LONG AND DEMANDING:

• Decoking process can last 20 to 40 hours for a liquid steamcracker.

• Depending on the feedstocks, coil configuration and severity, decoking for steamcracking furnaces is required every 14–100 days on average.

• A typical naphta furnace is decoked every 15–40 days.

• Maximum cycle time is around 60–100 days.

• Decoking is also required for quench towers and other sections.

USING ONIS LINE BLINDS ALLOW TO:

Reduce downtimes by more than 30%.

• Guarantee a 100% safe and efficient positive isolation.

 

 

 

BUSINESS CASE:

– Replacement of figures 8 (traditional blinding) with an Onis Line Blind on a steamcracker furnace for each decoking operation.
– A decoking operation is required every 20 days.


YOUR LINE BLIND PAID IN 2 MONTHS OR LESS

Traditional method
“figure-8”

Onis Line blind
8 x 2’’ 300#

8 x 8’’ 300#

8 x 12‘’ 300#

Benefits

Staff

5

2*

3* men exposure

Tools

Many tools, cranes…

Zero tool

Time of blinding operation

12 hours

2 hours

10 hours of production & operators safety

Loss due to downtime

$420K

$70K

$350K

Cost of Onis Line blinds

Costs of fig 8 are included

$500K

Pay-back period

45 DAYS

*However, some regulations require at least a supervisor in addition to the operator

A breakeven point in just a few months through a safer way to blind the whole process

Chevron Phillips
Dow
ExxonMobil
Huntsman
Petrobras
Shell
Total
Williams
ExxonMobil
Shell
Air Liquide OMV
Arkema Naphtachimie
BASF Repsol
Borealis Ruhr Oel
Cepsa Sabic
DEA Shell
DSM Total
Enichem VEBA
Esso
Borouge
CNOOC
Kemya
Qapco
Qatofin
Sabic
Shell
Total