Uploaded by zargul ammara

HAZOP STUDY

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2019
HAZOP STUDY FOR
REFRIGERATION CYCLE
2016-CH-404
SUBMITTED TO: SIR AZAM SAEED
HAZOP Study of Refrigeration cycle
Guideword Deviation
Causes
consequences
Action
No Flow
No flow of cooling
agent
Very low temperature
in condenser
No cooling
More
More flow agent
Improper checking,
loose valve
Fouling
Fouling can be b/w
evaporator and
condenser tube
Leakages of
refrigerant
it can lead to
increased energy
use by the
compressor.
Failure
Compressor failure
lubrication problems,
overheating,
slugging, flood back
and contamination
It may not work
properly
Restriction
Liquid line
restriction
Some type of
contamination
Abnormally high
discharge
temperature, Low
current draw, High
superheats, Low
condensing
pressures
Perform a freeze test
More
More flow
An interruption in the
flow
output to storage
tanks
because of an error
reading by
High level allows
entrainment of
liquid
ammonia into the
compressor can
Check level transmitter
Keep surface and tube clean
level transmitter
make the broken
blade
and shutdown
Other than
Other than flow
Control surge
malfunction due
to damage to the
flow control
Valve opening is
not
in accordance with
requirements
Install a proper valve in working
less
Less level
Input ammonia liquid
derived
from control flow too
low
The loss of liquid
level at which can
lead to
Compressor
surges and
Damaged
Compressor checking
Less
Less flow
Level valve failed to
open or did
not fit the required
percentage
Level high allows
entrainment of
liquid
ammonia into the
compressor
can make a blade
is
damaged