Document 2NmaO6ro0JQvkwzEajaoLRp36
Company: DOW CHEMICAL CO. ^-ocess: HDPE - POLY B
Worksheet
HAZOP-PC 1.00
Node: 17 Page: 1
-f----------------------------- ----------------------- -------------- ----------------------------------------------- --------------------------------- ---------------------------- -------------- ----------------------------------------- ------------------ ~+
Node: 17 Heating Water to DR-2007 (Including E-2017)
Parameter: Flow +-------------------------h
Intention: As Required to Vapor. Isop.
|GUIDEWORD DEVIATION POSSIBLE CAUSES i"------
No No Flow Pump trip. Valve blocked in.
Control valve failure. D-2811 low level.
CONSEQUENCES
Lead to shutdown of train. High volatiles in powder and transfer system.
RECOMMENDATIONS BY |
Put manual valve GH in pump discharge
Operator training RF
Make discharge AOV fail open.
GH
Develop standby procedures following maintenance.
RF
More Less
More Flow Less Flow Control upset.
No Problem See No Flow
MOD redundancy
*
OtherThan OtherThan Flow
+ ------------- +------------------ +--------------------------- +-----------------------------+---------------------------+---- +
DO A 120973 CONFIDENTIAL
Company: DOW CHEMICAL CO. T'~ocess: HDPE - POLY B
Worksheet
HAZOP-PC 1.00
Node: 17 Page: 2
Node: 17 Heating Water to DR-2007 (Including E-2017)
Parameter: Temperature
Intention: 102 Deg.C
|GUIDEWORD DEVIATION POSSIBLE CAUSES
+-----------------
More
Higher
steam control
Temp
valve failure.
Temperature
control upset.
Steam valve
bypass open.
CONSEQUENCES
Fuse polymer. Lead to a Train shutdown. Rotor damage. Plugged transfer system. Loss of heat transfer. Slurry to hydroclone due to loss of flow.
RECOMMENDATIONS BY |
Operator training RF
Cascade temperature and cond. level control system.
*
Shutdown feed to dryer on high temperature.
*
Multiple alarms designed into control system.
*
Less
Lower
See No Flow
Temp
H---------------- +---------------- V----------------------------- +--------------------------------1------------------------------+-----+
DO A 120^* CONFIDENTIAL
Worksheet
HAZOP-PC 1.00
Company: DOW CHEMICAL CO ' ocess: HDPE - POLY B
Node: 17 Page: 3
-------------------------------------------------------------------------------------------------------------------------------------------------------------------- --
Node: 17 Heating Water to DR-2007 (Including E-2017)
Parameter: Pressure
Intention: 50. psig at Jacket
+-------------- +--------------- 1-------------------------------+-------------------------------+------------------------------ H-----+
|GUIDEWORD|DEVIATION| POSSIBLE CAUSES |
CONSEQUENCES
| RECOMMENDATIONS |BY |
+-------------------+---------------------+---------------------------------------+-----------------------------------------+----------------------------------------+-----+
More
Higher
D-2811 pad/depad Overpressure dryer System pressure KW
Pressure valve failure.
jacket.
alarms installed.
Water makeup
Low level in
valve failure.
D-2811
PSVs installed. GH
PSV on dryer
jackets open.
Evaluate jacket/ GH
shell
differential
indication.
Determine and
RF
communicate
response to high
drum pressure.
+--------------+-------------- +---------------------------+---------------------------- +---------------------------+---- +
DO A 120975 CONFIDENTIAL