Problem No. 32: Temperature drop at bottom outlet of HP stripper in a Saipem urea plant
A discussion into the possible causes of a temperature drop of the HP stripper outlet of a Saipem urea plant after start-up.
Tag: Troubleshooting
Problem No. 26: How to find a leak in a liner
The protective loose liners in high pressure urea synthesis equipment require an accurate and reliable leak detection system in order identify in time when there is a leak in the liner, but locating a small leak is not always easy to find. Several methods are available but which works best for small leaks?
Problem No. 25: High temperature in top of HP scrubber
The function of a HP scrubber is to reduce the ammonia content in the inert stream coming from the high pressure synthesis section by washing the inert stream with the recycle carbamate and cooling it against cooling water. This discussion helped to find the root cause of problem when the temperature in the top of the HP scrubber increased unexpectedly.
Problem No. 21: Vibrations in the discharge line of the HP reciprocating carbamate pump
In all urea plants, high pressure pumps are used to pump the feedstock ammonia and carbon dioxide to the high pressure synthesis section and in most urea plants carbamate liquid is recycled from the recirculation section to the synthesis. Reciprocating pumps are used for these services and sometimes vibration problems occur in the discharge pipeline. This discussion considers the possible causes and solutions to problem.
Problem No. 20: Unblocking pipelines after a urea plant shutdown (continued)
A discussion on what measures can be taken to unblock pipelines and heat exchangers after a urea plant shutdown.
Problem No. 16: High pressure scrubber problem
Sometimes a serious problem occurs in a urea plant, which forces the plant to reduce capacity or even forces a shutdown. It is then vital to find the root cause of the problem as soon as possible, especially if the problem repeats. Such a situation happened at Khorasan Petrochemical Company in Iran which experienced a problem with the high pressure scrubber.
Problem No. 10: High CO₂ content in liquid outlet of a high pressure CO₂ stripper in urea synthesis
Possible causes and solutions to the problem of high CO2 content in the liquid outlet of a high pressure SO2 stripper in a urea plant are discussed.
Problem No. 9: Unblocking pipelines after a urea plant shutdown
In several sections of a urea plant, pipelines can become easily blocked when temperatures become too low and during a shutdown of the plant blocking can occur if the right measures are not taken.
Problem No. 7: Urea melt pump damage
The urea melt pump is a challenging application of a centrifugal type of pump. Urea polymer lumps falling in the melt pump suction line can cause cavitation of the pump and even damage the pump shaft.
Problem No. 6: Choking of urea fluid bed granulator nozzles
The nozzles used in urea fluid bed granulation form the most essential part of a fluid bed granulation plant. This discussion looks at the problem of nozzle choking, the causes and solutions.