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.
Tag: Urea
Problem No. 19: High pressure pumps – which is better reciprocating or centrifugal?
In every urea plant, 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 section. This discussion compares the advantages and disadvantages of reciprocating and centrifugal pumps based on operating experiences in the industry.
Problem No. 18: HP stripper passivation air
Austenitic stainless steel can be protected against carbamate corrosion in urea plants by adding oxygen in the urea process. This discussion explores the experiences with different amounts of oxygen in the HP stripper in various urea processes.
Problem No. 17: Loose liner or overlay welding?
A discussion about the differences between loose liners and overlay welding for protection of high pressure equipment in urea plants.
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. 15: Pressure safety valve experiences
Pressure safety valves are critical equipment items in any chemical process plant. This article discusses experiences and challenges of pressure safety valves in urea plants.
Problem No 14: High synthesis operating pressure
Operating at the wrong synthesis operating pressure is always a tricky situation for any urea plant operator, knowing that operating at too high a pressure will lead to the pressure safety valves blowing off. The key is to measure the synthesis pressure in a reliable way.
Problem No. 13: 3-Way valves in urea melt lines
In several urea plants, 3-way valves in urea melt lines have experienced leakage problems but successful innovations are available that provide a reliable solution.
Problem No. 12: Oil fouling of the high pressure stripper in a urea plant
A discussion on the best methods to solve oil fouling problems of the high pressure stripper in a urea plant.
Problem No. 11: How to run high pressure centrifugal pumps in parallel mode
When operators have a bad experience when operating critical equipment in certain modes, how do you convince them that operating in a certain mode should be possible and that it will bring benefits? This round table discussion discusses the parallel operation of high pressure centrifugal carbamate pumps.