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  • Users: rifa92
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  1. rifa92

    How to calculate minimum allowable thickness of water wall tubes

    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?
  2. rifa92

    Maximum shim size under the 250 KW motor

    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...
  3. rifa92

    Alternative material for Unalloyed Titanium in Heat Exchanger Tubes

    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...
  4. rifa92

    Vibration Limits ISO 10816 for Motor and Pump

    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...
  5. rifa92

    Identification of Vibration Alarms ISO Standards for Inudstrial Equipment with multiple components

    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...
  6. rifa92

    Selection of Better Material for Vessel Construction

    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...
  7. rifa92

    Damage mechanism for CI Piping used in NH3 and CO2 Service

    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...
  8. rifa92

    Damage mechanism of CI Piping used for Ammonia and CO2 service

    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...
  9. rifa92

    SS-Micro-structure Interpretation

    Hi, Hope you guys are doing well. I have occurred a microstructure (pic attached) which appears to be resembling that of martensitic stainless steel, however, the composition of the material is telling a different story. I used OES for chemical analysis, the sample consists of C (0.129 wt%)...
  10. rifa92

    Reaction loads at the Support of an overlapping structure

    Hi, I wanted some clarification for how would the reaction loads at end supports and joint will be calculated in the case shown in the schematic diagram. The load of right structure would be supported by roller A however that load would also be transmitted to roller B. In this for value we can...

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