Document 10x6re1JezdMX0yGz5veB1Kgo
Company: DOW CHEMICAL CO. ~*ocess: HDPE - POLY B
Worksheet,
HAZOP-PC 1.00
Node: 11 Page: 1
----------- ------------------------------------------------------ ----------------------------------------------- ----------------------- ----------------- --------------------------------------------------- i-
Node: 11 First Stage Dryer (DR-2007) / Process
+--P---a--r--a--m---e---t-e+r-:----F--l-o--w--------
+-----------------------------------
Intention: 33,000 lb/hr
+------------------------------------- +-----------------------------------
+-----
+
IGUIDEWORD|DEVIATION| POSSIBLE CAUSES |
CONSEQUENCES
| RECOMMENDATIONS |BY |
+------------ ----I------------------(---------------------------------------------- -------------------------------------------------- 1-------- -- -----------------------------|--,,--
No
No Flow Rotary feeder
Shutdown train.
Motor amps are
*
trip.
Fused polymer.
monitored.
Dryer rotor trip. Powder overhead.
Broken blades.
Plug exchangers.
Speed alarm.
*
Broken coupling. High pressure.
Motor shutdown.
Powder recycle to *
Fused polymer in
prevent buildup.
the discharge.
Excessive buildup
Evaluate % solids BS
analyzer on
hydroclone
overhead.
Set rotor blades. *
More
More
Flow
See Node#l/More flow. Excessive seal flush.
Overload dryer.
High seal flush
Solvent wet powder switch.
Refer Node#1/More
flow.
See Node #1.
*
AsWellAs
AsWellAs Flow
Jacket crack.
Water in the
Backup from
system.
second stage
Stop reaction.
dryer.
Generate HC1 in
Mechanical seal. dryer.
Left from shudown Nitrogen in dryer.
Evaluate how to get water out of D--2302.
Equipment drying procedure.
RF GH
Operation train. GH
Worksheet
HAZOP-PC 1.00
Company: DOW CHEMICAL CO. "-ocess: HDPE - POLY B
Node: 11 Pag : 2
+-------------------- -------------------------------------------- -------------------------------- ------------------------------------------------------------------------------------------------------------+
Node: 11 First Stage Dryer (DR-2007) / Process
Parameter: Temperature
Intention: 30-90 Deg. C
H--------------------------------------------------------------- 1
----------+--------------------------- ----------------------- ----I------------- -------------------- --H------|-
|GUIDEWORD|DEVIATION| POSSIBLE CAUSES I
CONSEQUENCES
| RECOMMENDATIONS |BY |
+--------------------- i
More
Higher
Temp
Loss of heating water control.
Fused polymer. Plug outlet. Shutdown train.
HAZOP temp.control.
BB
Less
Lower Temp
+----------------------
Loss of steam to E-2017. Loss of water flow to the dryer High solvent feed. Loss of heat transfer due to buildup.
Wet product. Emissions problem in extrusion area. Plugging. Reach explosive range in the check hopper.
Low temperature shutdown.
Hot water control scheme.
* *
00 A 120965 CONFIDENTIAL
Company: DOW CHEMICAL CO. r,'*ocess: HDPE - POLY B
Worksheet
HAZOP-PC 1.00
Node: 11 Page: 3
+*- ------------------ ----------------------------------------------------------- -- -------------- ------------ --------------------------------- --------------------------- -- -----------*----- ---------------------------- -----+
Node: 11 First Stage Dryer (DR-2007) / Process
Parameter: Pressure
Intention: 1. psig.
+--------------+--------------+---------------------------+---------------------------- +---------------------------+---- +
|GUIDEWORD|DEVIATION| POSSIBLE CAUSES |
CONSEQUENCES
| RECOMMENDATIONS |BY |
+--------------------- +--------------------- +-----------------------------------------+--------------------------------------------+-----------------------------------------+------+
More
Higher Pressure
Vapor outlet plugged or blocked. Nitrogen on the end plate open. Loss of MRU or chilled water.
PSV Discharge. Powder in the flare header. Isopentane in DR-2008.
Operations training.
System pressure alarms.
Block feed on high pressure.
RF * *
Less
Lower
Pressure control Get water from
Low pressure
*
Pressure valve failure.
DR-2008.
alarm.
Get oxygen into
the dryer.
Evaluate adding GH
nitrogen to
D-2302 for low
pressure or high
oxygen.
+-------------------- +------------------ +----------------------------------- +------------------------------------- +----------------------------------- +----- +
DO A 120966 CONFIDENTIAL
Worksheet
HAZOP-PC 1.00
Company: DOW CHEMICAL CO. "'ocess: HDPE - POLY B
Node: 11 Page: 4
+----------- ___________________----------------------- __________----------------------- _________________--------------h
Node: 11
First Stage Dryer (DR-2007) / Process
Parameter: Vessel Entry
Intention: Safe Operating Procedure
+------------- +-------------- +---------------------------+---------------------------- +---------------------------+---- +
|GUIDEWORD|DEVIATION| POSSIBLE CAUSES I
CONSEQUENCES
| RECOMMENDATIONS |BY |
+--------------------+----------------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+-------+
Inadeguat Inadeguat Pyrophoric
Fire.
Evaluate C02 or RF
Vessel
concentrations.
Asphixiation.
steam purge or
Entry
Nitrogen atmos.
Hydrocarbon
nitrogen purge
Inadequate entry release.
saturated with
preparation.
water.
Write vessel
RF
opening procedure
for DR-2007.
+---------------------+----------------------+----------------------------------------- +--------------------------------------------+-----------------------------------------+-------4-