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  1. impeller1

    Best Method to Survey Piping

    Right, I see. Well basically, we know the piping would be susceptible to land slippage in this area so we conduct surveys to quantify the displacement. The displacement is then compared to set allowable displacement values so the precision I'm looking for would be to the mm. I honestly can't...
  2. impeller1

    Best Method to Survey Piping

    Hi guys, thanks for your thoughts on the matter. My apologies, it is above ground piping and currently, the vendor is using a total station survey. Specifically, use of the total station for horizontal displacement, and digital levels for vertical. A system of control points were set up along...
  3. impeller1

    Best Method to Survey Piping

    Hi All, Firstly let me start off by saying I'm not well versed with all the lingo associated with Surveying, so please forgive me if I use some of the terminology incorrectly. I just wanted to get some input / advice with respect to performing a pipeline survey to monitor movement of the piping...
  4. impeller1

    Increase of allowable stress via xray in welded pipe

    But even though there is a long seam weld, isn't the weld itself typically stronger than the parent material? So provided the weld is 100% acceptable as per RT, why can't the higher stress value be used?
  5. impeller1

    Vessel Cover Gasket

    Oh dear, Yes, Monday's are really the worst.. the gasket thickness is 2mm, sorry about that error, as glaring as it is.. anyway, yes, the process is nitrogen dioxide..so I can't afford for a gasket to go up there and fail at all.. 10 bars @ 490 deg. C.
  6. impeller1

    Vessel Cover Gasket

    Hey Everyone, I have an urgent problem here, basically, I've got a vessel with an operating pressure of 10 bars. The incorrect gasket was used to seal to top cover flange of the vessel (approx 3950mm in diameter). The correct gasket was now specified in terms of material, however, two different...
  7. impeller1

    Weldolet vs Flat Weldolet

    Hey all, I'm fairly new to fabrication and welding, so I wanted to find out if there is a difference between a weldolet and a flat weldolet. I have to specify one for replacement, and according to my Isometric, its specifying a flat weldolet. I did a little digging and saw somewhere that flat...
  8. impeller1

    Vertical Turbine Pump Flow Inlet Velocity

    Hi guys, I have a little problem. I'm trying to determine the inlet flow velocity of fluid to my pump. It's a 4 stage vertical turbine pump and its situated to one end of a well. Water flows into the well via a 24" diameter pipeline at an entrance velocity of approximately 8 ft/sec. Now the...
  9. impeller1

    Durability of Nylon 11 coated disc (butterfly valve)

    I'm assuming cost is a major factor to you? I'm familiar with butterfly valves which carry the nylon 11 coating. It works well in our seawater applications and protects the disc from corrosion. Is this for temporary use? Or long term? As mentioned above, the coatings do chip overtime as no...
  10. impeller1

    Butterfly Valve Question

    Good day, Happy New Year to all of you. Young Engineer here, and I have a question about the material of a particular valve. We've got 30" butterfly valves that are underwater (seawater) and are currently in need of replacement. Unfortunately, the valves are obsolete and are not manufactured...
  11. impeller1

    Impeller Trimming

    Ok let me explain the full story..sorry, I should have done this from the start..the decision was made based on Engineering review that we should fit larger impellers on our Pumps. (6 single stage vertical turbine pumps rated at 8287 usgpm @ 191 feet of head)The larger impellers were supposed to...
  12. impeller1

    Impeller Trimming

    Good day, We're considering trimming the impellers on our 6 vertical turbine Pumps. Pumps are consuming too much power and we'd like to reduce it by trimming them. I would like to know, is there any particular method / procedure to trimming impellers? The impellers are semi open impellers. Do...
  13. impeller1

    12 stage centrifugal pump

    Good day, I just need confirmation on something. I have a 12 stage horizontal centrifugal pump. I have recorded values of flow, suction pressure, discharge pressure and speed. I'd like to work out the flow and differential head values to the rated speed. I've applied the affinity laws: N1/N2 =...
  14. impeller1

    Motor Horsepower

    Ok ok..let me explain exactly what I want to do..(Sorry, should have done this before) , I'm trying to determine the pump's BHP from operation. I dont have any flowmeters so I cant tell using the flow. So I was trying to determine how to get the motor output horsepower, then use the motor's...
  15. impeller1

    Motor Horsepower

    Ok, so is the power its producing equivalent to when you multiply the power its using by its efficiency?? Am I correct?? And the power it's using is found using the above equation?
  16. impeller1

    Motor Horsepower

    Good day, I have a pump and motor configuration. I'm trying to find the equation to calculate the horsepower that the motor is producing. I have the motor current and voltage. it's a 3 phase motor, so I'm assuming I have to use this; P = (3)^1/2 x V x I x cos(power factor) ?? Can someone...
  17. impeller1

    Not really an engineer, but I want to be...

    Go for it man. When I was doing my Bachelor's degree about 2 years ago, there was this retired pilot who was in my year. He graduated with First Class honours with a Bachelor's degree in Civil Engineering. He was about 55 years at the time!! So you're nowhere near close!
  18. impeller1

    Pump Housing Weld Repair

    If you're really unsure, why don't you ask the pump manufacturer for their recommended weld procedure? Some campanies may be willing to share that information with you. Or you could do what pumpking said which is what our shops here might do as well.
  19. impeller1

    Air Release Valves

    Any responses??
  20. impeller1

    Air Release Valves

    Good day, I'm not too familiar with ARV's however I know the basic principle behind how ARV's work. However, what exactly are the "Air and Vacuum Flow rate" and the "Automatic Air discharge"? I noticed each is plotted on a graph, but what exactly does it represent? Also, in selecting an ARV...

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