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.
Tag: Ureaknowhow
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.
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. 8: Urea prilling buckets
Prilling buckets are the oldest technology to form solid urea in a urea plant. This article looks at the design criteria for prilling buckets and reports on experiences with various designs.