As per RBI analysis of our Ammonia storage tank, the inspection interval is 15 years ( EFMA Criteria was used to calculate the inspection interval). Now we have read somewhere that by carrying Fracture Mechanics analysis, the inspection interval can be extended by 10 years. Does anyone know...
We are running a fertilizer complex consisting of Ammonia and Urea plants. Ammonia and CO2 gas are separately fed into Urea plant from Ammonia plant. The CO2 gas is compressed to 143 bar before entering into Urea reactor where it mixes with Ammonia to form Ammonium Carbamate solution. We are...
We are operating a Urea plant built on Stamicarbon technology. The High pressure synthesis loop (consisting of Reactor and stripper and HP Carbamate condensers) is made of Safurex material. We had inspected it with Stamicarbon experts in 2011 and they advised to keep the next inspection after 6...
we have a pressure vessel of which the bottom shell portion (cylindrical) severely corroded due to which there is a thickness loss of 8 mm (original thickness was 34 mm and now it is 26 mm). There is an option of replacing the bottom shell course by new one but it will take a lot of time and we...
We have a vertical U-tube bundle type heat exchanger installed at our ammonia plant (Waste Heat Boiler). It was manufactured in 1975 on Stoom Weezen code. Now the bundle has completed its service life and we want to replace it, while keeping the existing shell unchanged. Our technical...
I am searching for a machine which can do onsite machining of round flange faces as well as pass partition slots of heat exchangers. Are there any such machines available which can do both the jobs?
I am searching for a trolley mounted portable air conditioner with hose for cool air (up to 60 ft long). This is required for quick entries into vessels which take several days when cooled with conventional air blowing. Is there some product available in the market?
I am searching for a trolley mounted air conditioner with cool air hose (up to 60 ft long). This is required for quick entries into vessels which take several days when cooled with conventional air blowing. Is there some product available in the market?
We have some heavy Rockwell Edward valves (up to 24", #1500 size)installed at our plant. These valves are welded (no flanges) and dismantling is very difficult for seat lapping at our workshop. We are in search of some vendor who can provide on-site seat lapping services of these valves. Our...
One of the heat exchangers at our plant is near to completion of its service life and now we want to retube its U-Bundle. Its a high pressure tube bundle with channel head as a integral part of it. Now for longer service life we want to change the material of the tubes from existing CS to SS...
We have a refectory lined transfer line installed between primary and secondary reformer at our plant. The material of the pipe is DIN 17155 (19Mn5). The design wall temperature of the pipe written over drawing is 343 Deg C. However when I searched the literature over internet, I found that the...
During a recent activity on one of our equipment, one of its head bolt M100 X 4 broke in the middle. The bolt one side is in the tapped hole of the channel head , whereas nut is applied on the other side. We had a spare bolt, so cut the spare bolt from the length where the bolt stuck in the...
We have a small surface condenser consisting of 600 tubes (tube diameter 25 mm). After 25 years of its service life, we are planning to re-tube it as 12 % of its existing tubes have already been plugged. For this activity we want to hire a contractor. I am interested to know about the steps...
As per TEMA the grooves in the tube sheet holes are not required if tube is strength welded with the tube sheet. Can someone clarify the difference between strength weld and seal weld?
One of the surface condensers (for steam turbine) have completed its service life and we want to replace it by a new one. The weight of the condenser is 105 tons and its surrounded by structure and piping on three sides and over the top. To remove it,the only possible option to pull it from one...
We have a vertical exchanger (called waste heat boiler)installed at our ammonia plant. Often we have to replace the tube bundle for which we use 150 tons crane (the bundle weight is 50 tons). Now we want to install overhead pulley over the exchanger so that we have permanent arrangement for the...
We are purchasing a surface condenser. the basic engineering design firm has specified the material of construction such as Tubes and Tubesheet of the condenser are of SS304L whereas the shell and waterboxes are made up of Carbon Steel. As the service fluid is liquid (an electrical conductor) on...
We are purchasing a surface condenser for which we had specified seamless SS304 tubes. Now the vendor has informed that he will use A249 TP304L tubes. This ASTM class represent welded austenitic stainless steel tubes. Please guide me whether the welded tubes should be acceptable?
