Document 99Mrko2wmXRvOjJy0n8yOy6aq

Company: DOW CHEMICAL CO. - -ocess: HDPE - POLY B Worksheet HAZOP-PC l.oo Hod : 20 Pag : l I Node: 20 DR-2007 MECHANICAL SEAL Parameter: Flow Intention: 10 GPH H20 |GUIDEWORD DEVIATION POSSIBLE CAUSES CONSEQUENCES No No Flow INSTRUMENT DAMAGE SEAL FAILURE ENVIRONMENTAL MISOPERATION RELEASE LOSS OF PUMPS 02 INTO VENT PLUGGED LINE SYSTEM REGULATOR FAILURE SHUT DOWN TRAIN RECOMMENDATIONS EVALUATE WATER FLOW INDICATION BY | * EVALUATE WATER STRAINER GH EVALUATE AUTO START OF SPARE CONDENSATE PUMP RF GAS DETECTOR AT SEAL * EVALUATE CONTINUOUS N2 PURGE TO SEAL CAVITY GH - EVALUATE WATER GH FLOW IN BOTTOM/ OUT TOP EVALUATE SOURCE GH/ OF WATER RF +--------------- +--------------- +-----------------------------+------------------------------ +-----------------------------+-----+ DO a Company: DOW CHEMICAL co. TV-ocess; HDPE - POLY B Worksheet HAZOP-PC 1.00 Node: 20 Page: 2 Node: 20 DR-2007 MECHANICAL SEAL Parameter: Temperature Intention: 5-<100 DEG C WATER |GUIDEWORD|DEVIATION| POSSIBLE CAUSES | +-------------------- CONSEQUENCES | RECOMMENDATIONS |BY | More Higher SEE NO FLOW SEE NO FLOW CHECK TIE IN GH Temp WATER FLASHING IN WRONG TIE IN SEAL EVALUATE SEAL GH POINT SPECIFICATIONS/ TEMPERATURE LIMITS Less Lower Temp LOW AMBIENT TEMPERATURE SEE NO FLOW ESTABLISH FREEZE DS POLICY +------------------- FOLLOW FREEZE POLICY GH DO A 120983 CONFIDENTIAL Worksheet. HAZOP-PC 1.00 Company: DOW CHEMICAL CO. --ocess: HDPE - POLY B Node: 20 Page: 3 +------------------------------------------------------------------------------------------------------------------ -------------------------------------------------------------+ Node: 20 DR-2007 MECHANICAL SEAL Parameter: Pressure Intention: 10 PSI ABOVE DRYER +-------------+--------------+-------------------------- +--------------------------- +-------------- -------------+--- + |GUIDEWORD|DEVIATION| POSSIBLE CAUSES I CONSEQUENCES | RECOMMENDATIONS | BY | +----------------- +-------------------+------------------------------------ +-------------------------------------- +------------------------------------ +------ + More Higher BACKPRESS WATER DESTROY SEAL Pressure REGULATOR FAILURE SEE NO FLOW CHECK REGULATOR SETTING GH MISOPERATION FREEZING WEATHER INCREASE SEAL WEAR CHECK SEAL DESIGN GH PRESSURE TRAINING RF Less Lower REGULATOR FAILURE EXCESS SEAL CHECK SEAL GH Pressure LOSS OF WATER LEAKAGE SPRING TENSION PUMP CHECK MINIMUM GH WATER PRESS REQ'D +------------- +--------------+-------------------------- +---------------------------- +-------------------------- +---- + 120984 DO A CONF1 denti*l Company: DOW CHEMICAL CO ocess: HDPE - POLY B Worksheet HAZOP-PC 1.00 Node: 20 Page: 4 ----------------------------------------+ Node: 20 DR-2007 MECHANICAL SEAL Parameter: Service Failure Intention: MAXIMIZE SEAL LIFE H --~-- t""-----------------f--------------------------------------------------------------+------+ |GUIDEWORD|DEVIATION| POSSIBLE CAUSES j CONSEQUENCES | RECOMMENDATIONS |BY | +----------------- +----------------- +--------------------------------- +------------- '--------------------- +--------------------------------- +----- + More More Service Failure HIGH VIBRATION BEARING FAILURE SHAFT FAILURE WAX BUILDUP HIGH MAIN BUDGET EVALUATE VIBR PLANT SHUTDOWN MONITORING HYDROCARBON RELEASE (WILL ALSO EVALUATE AMP GD/ DS * BROKEN BLADE . LOSE PACKING) MONITORING MISALIGNMENT DRIVE SYSTEM FAILURE LACK OF EVALUATE CAIN JULY 90 FAILURE GH LUBRICATION EVALUATE SEAL N2 KW TRIP BASED ON MECH FAILURE/ PROBLEM SIGNAL/ SEAL GAS RELEASE EVALUATE SHUTDOWN RF LOGIC +---------------+------------- +---------------------------------- +-------------------------------------+---------------------------------- +----- + DO A 120985 CONFIDENTIAL