Dear Experts,
I am reaching out to you to seek your expert advice regarding our 14” OD & 12.7 mm thk. Process Air Line (SS 321 H metallurgy) operating at 550 oC (1022oF) which we intend to replace due to multiple Stress Relaxation related cracking related leakages in the past. Root cause of...
Dear Experts,
Hope you are well. . I am writing this post to seek your expert opinion and guidance regarding a refractory issue faced recently at our site. Details are appended below.
We have a catalyst loaded vessel (secondary reformer) at our ammonia plant. This equipment is refractory lined...
Dear Experts,
We are getting a new Ammonia Storage Vessel fabricated. Given below are major equipment design details
Material (nozzles/ shell & heads): SA-333 GR.6 / SA-516 GR.60
Design Pressure: 30 kg/cm2
Design Temperature: -20/70 OC
Material thickness: 32 mm
As per equipment manufacturing...
Dear Experts,
Hope you are well. We have a double walled Ammonia Storage Tank at our site with below mentioned key specifications:
Material: A-516 Gr 60
Height: 16 meters
Inner Tank ID: 26 meters
Operating Temperature: -33oC
Capacity: 7,350 m3
Design Code: API 620
Commissioning Year: 2010
No...
Dear Experts,
Hope you are well. We have a double walled Ammonia Storage Tank at our site with below mentioned key specifications:
Material: A-516 Gr 60
Height: 16 meters
Inner Tank ID: 26 meters
Operating Temperature: -33oC
Capacity: 7,350 m3
Design Code: API 620
Commissioning Year: 2010
No...
Dear Experts,
Over the last 1 month we have observed 02 leakages from our CO2 removal unit piping. Request your expert advice on what are the likely cause(s) for these leakages and what can be done to prevent any further leakages. Given below are brief details of the process and respective...
Dear All,
We are using plug globe valves as isolating valves on our ammonia circulation pumps. Temperature of service varies between zero degree C to ambient temperature of 25 degree C. We have recently been observing leakages from these valves glands. The valves were installed about 30 years...
Hi,
Our company is trying to setup a heat exchanger retubing facility at our site. Over the next few years we intend to re-tube heat exchangers with tubes in the size range of 1/2" to 1". I am developing a technical SOW for bidding purposes for a Electrically operated Hydraulic Tube Puller...
Dear Experts,
We have been facing recurrent cracks issue on our Ammonia Let Down Vessel. I have already discussed on the issues being faced on this vessel a few years back as well. Link to the discussion is given below:
https://www.eng-tips.com/viewthread.cfm?qid=408459
More cracks were...
We have a waste heat boiler that we intend to re-tube at our plant site during a turnaround opportunity. Since this is a business critical equipment we intend to engage the best company available in the world for it. Request your expert advice on the best companies available in your experience...
I have been assigned to conduct a feasibility study on implementing cathodic protection on 140 shell & tube type heat exchangers at our site. Exchangers with cooling water on tube side are particularly susceptible to leakages due to poor cooling water chemistry management, CS metallurgy and...
Since I could not a response in Corrosion Engineering forum I am writing the same question in this forum in hope the expert metallurgists here may help me in my query. The query goes like this:
We are trying to explore an NDE technique to detect pitting on tube OD of our Waste Heat Boiler. With...
We are looking for an inspection technique that can detect pits on a tube OD. Tube OD is 38 mm and thickness is 4 mm. Tube material is 13CrMO4-5. We understand UT-IRIS and RFT can be used to detect the pits externally, however we are unable to get the necessary clarification on will the...
Dear All,
With most of the high temperature pipe line generally insulated, valve bodies and flange joints are typically not insulated. I have gone through piping specifications governing our piping and they have not recommended insulating the flange joints or valve bodies unless they are steam...
We recently had to shutdown our plant due to tube leakage in our Waste Heat Boiler(WHB). Upon vessel opening we observed visible leakage from at least 01 tube as the refractory and heat shield adjacent to it was damaged. Evidence suggested that upon leakage BFW water flashed and damaged the...
We have been facing repeated tube leakages issues with our ammonia condensers having carbon steel tubes. Exchanger shell side has Ammonia at 130oC and 17 kg/cm2g while tube side has cooling water at 34oC and 4.2 kg/cm2g. Tube OD is 19.05 mm and ID is 14.83 mm. We suspect due to poor cooling...
Dear All,
We recently observed leakage from welding joint of our Secondary Reformer return line. Mentioned below are brief details of piping:
Service: Process Air
Operating Temp= 550-560 C
Operating pressure= 36 kg/cm2 g
Pipe Material: ASTM A 312 TP321 H
Radiography: 100 % at time of...
Dear All,
We recently observed some cracks on one of our Ammonia Let Down Vessel. Mentioned below are brief details of the equipment:
Service: Ammonia
Shell Material: A516 Gr. 60 N
Operating Temperature : 2oC
Operating Pressure: 26 kg/cm2 g
Shell Thickness: 32 mm
PWHT: Yes
Vessel Orientation...
Dear All,
We are facing repeated leakage issues from Carbamate Condensers and Stripper in our Urea plant. Leakage sites are T-TS seal weld and internal groove formation at HAZ area of tube itself. Leakage occurs in top 10-15 mm of tubes or its seal weld. Please share if Please share your...
Dear All,
We are facing repeated leakage issues from Carbamate Condensers and Stripper in our Urea plant. Leakage sites are T-TS seal weld and internal groove formation at HAZ area of tube itself. Leakage occurs in top 10-15 mm of tubes or its seal weld. Please share if Please share your...
