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Hi, We are operating CFB boilers having water wall tubes OD 60mm, thickness 5 mm and material 20G Gb5310 or ASTM SA-106B. How can I calculate the minimum allowable thickness?

Thank you for all the responses. Ideally, I don't want to weld as we will be overhauling the old motor and put it back when this new motor requires repair etc. We want to make a universal bed on which I can fit both types of motor (low cost) instead of buying a brand new motor of same specs.

Sorry it was a writing error, it’s 315 not 305 mm. Secondly, motor power rating is same but frame size is different. Would it be okay, if I use a machined flat plate but don’t weld it with bed and only hold it down with the bolts? Or should I weld it?

Thank you for response. I have attached a small sketch hope it helps. The new motor is to be installed in place of old motor. I’m thinking of using flat plate that covers entire foot area, drill through holes in the plate and bolt it with motor foot using hold down bolts.

Hello Everyone, We have a 250 kW motor that drives a boiler FD fan. Due to damage to the original motor, we are planning to install a replacement motor of the same rating. However, the new motor has a height difference of 40 mm from the motor foot to the shaft center compared to the original...

Thank you EdStainless, if it were erosion shouldn't it have affected the bends more? In our scenario, the bends are in better condition compared to the straight portion.

No we haven't explored it. We don't to modify the material as it will affect performance of heat exchanger.

Apologies for such delayed response. Responding to EdStainless PH of fluid in tube is 7.5. Discussion on deposits below. Now that one of the faulty exchanger boxes got replaced, I got a chance to look into the failed tubes. However, due to brittle nature and small thickness it is difficult to...

Thanks for your replies. The exact damage mode I haven’t not witnessed myself but from information gathered, the tubes leak at the bends. I have been studying and found that gr 2 is susceptible to under deposit crevice condition in the operating condition we are using and have recommended grade...

Dear All, We have a vertical heat exchanger that comprises of seven boxes. These boxes are stacked over each other. The tubes are made of Titanium ASTM B338 Grade 2 and boxes are cast iron. The life of tubes is approximately five years and we would like to choose material that will provide...

Hello, I have a query regarding how to identify vibration limits for an equipment with multiple components. For example, a pump that is drive by motor. For motor ISO 10816-3 identifies the vibration limits for electric driven in class 1 & 2 whereas class 3 & 4 are for pumps. So while defining...

Hello, I have a query regarding how to identify vibration limits for an equipment with multiple components. For example, a pump that is drive by motor. For motor ISO 10816-3 identifies the vibration limits for electric driven in class 1 & 2 whereas class 3 & 4 are for pumps. So while defining...

The paddles are used to move forward the mixture. significant thickness loss occurs at the discharge side.https://files.engineering.com/getfile.aspx?folder=b4b14a7a-1532-41f4-a907-fc81a66b59eb&file=E035A01F-9EE4-416D-B298-445688140CB3.jpeg

MJcronin, thanks for the input. Can you kindly let me know details you require further? The erosion/corrosion is local and not uniform. At the feed end CaO and H20 enter vessel and start getting mixed. Most of the thickness loss is at the discharge side. The 34ft length is divided into 8...

r6155 Original thickness was 12mm and eroded thickness can get to 1mm.

The vessel is rotating and used for mixing of CaO and H2O to form Ca(OH)2 also known and milk of lime. Corrosion is also involved. Total length of vessel is 34ft. Weld overlay or coating would result in increase in weight so other things would also be need to considered like driving motor...

The vessel diameter is 6ft.

Hi everyone, We are using a horizontal rotating vessel/mixer made of SA-283 Grade C. Due to erosion the vessel shell needs to be replaced every two three years. How do I select a better material with higher hardness, economical and that can easily fabricated. Any standard for selection of...

Hello everyone, We are using CI piping for fluid service containing NH3,CO2,H20 and H2S. The fluid composition is as follows: NH3 = 0.402 kg/m3 CO2 = 0.255 kg/m3 H2O = 0.128 kg/m3 H2S = 0.0003 kg/m3 Temperature = 60-80Celcius Pressure (psi) 14.7 The CI piping is suffering from thickness loss...

Hello everyone, We are using CI piping for fluid service containing NH3,CO2,H20 and H2S. The fluid composition is as follows: NH3 = 0.402 kg/m3 CO2 = 0.255 kg/m3 H2O = 0.128 kg/m3 H2S = 0.0003 kg/m3 Temperature = 60-80Celcius Pressure (psi) 14.7 The CI piping is suffering from thickness loss...