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  • Users: safiamoiz
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  1. safiamoiz

    Clearance between impeller and casing body

    In mixed flow type impeller pump, what should be the clearance between the impeller and casing. I am not asking the clearance between impeller wear ring and case wear ring. Rather when the impeller is going to rotate in side the casing body, what should be this radial clearance. My pump is a...
  2. safiamoiz

    Tube bundle expansion in Reboiler

    We are using a Kettle Type reboiler. I do not have much fabrication details of the boiler. I want to know how the expansion of tube bundle is accommodated in a Kettle type reboiler (heat exchanger). Any sample fabrication drawing may help me. Are the baffles of tube bundle welded to shell ...
  3. safiamoiz

    Stay & Unstay

    Kindly define "Stay" and "unstay" surfaces, parts as explained in ASME Section I. What is the difference between a stay head and a unstay head.
  4. safiamoiz

    Flaw repair on pipe surface

    ASME Section XI deals with the inspection of nuclear components. It also details the repair / replacement activities based on unacceptable flaw detection. Does this flaw detection is on weld surfaces only. Such as the welding joints of a pipe or it covers the whole pipe surface for flow...
  5. safiamoiz

    Elbow Schedule

    We need to replace a 6 NPS Sch 120 elbow in piping system. In our store we have a 6 NPS Sch 160 elbow. Can we use this new elbow with a higher sch.
  6. safiamoiz

    Use of Sch 80 in place of Sch 40

    We have a 4 NPS Sch 40 line run in our plant. At one point we need to change 3 feet length of this pipe with a new pipe. We have with us a pipe of 4 NPS Sch 80. Can we use Sch 80 pipe in a line of Sch 40. The material is same. Where i can find an article in ASME in this regard.
  7. safiamoiz

    Root Pass Examination

    We have to butt weld a 2 1/2 NPS Sch 80 pipe with a valve. Our NDE person wants to have radiographic examination after the root pass. He would then allow us to proceed with filler passes and finally with capping passes. After that he will examine by radiographic examination and dye penetrant...
  8. safiamoiz

    Qualifying a 6 inch Nom. Sch 120 Tee

    We have few tees of 6 inch Nom. Sch 120 , seamless, with material ASTM A-234 Grade WPB. It is of Chinese origin. We have a photo copy of Chemical test and Mechanical test. The tee has embossed heat number and it is same as on test reports. Can we use this tee for class 1 NB purpose. Do we need...
  9. safiamoiz

    Deep well turbine type pump for sea water pumping

    We need a pump to supply sea water to our small size 50,000 IGPM capacity desalination plant. We have contacted KSB pump company . They have selected their DWT- B22 B 1 type vertical turbine pump. I am not very clear about their selection, because this pump has open shaft running in a column. It...
  10. safiamoiz

    ASME UN 12C

    Dear Friends We have got an old Carbon Filter Tank (atmospheric tank). It is operating at our facility since 1978. Now we want to replace it with a new tank. I have dug out the old manufacturing specification. It says that it was manufactured as per ASME UN 12C. I want to know what is this and...
  11. safiamoiz

    Flange Thickness Calculations

    A pressure vessel has a 16" Nom. Sch 80 pipe attached (welded) to it , the length of pipe is 2 feet. At the end of pipe a slip on flange is to be welded and to be covered by a blind flange. From where shall i calculate the desired thickness of flange, bolt size & bolt pitch circle dia. The...
  12. safiamoiz

    Testing a Turbine Pump

    My company has purchased a 10 stage Turbine pump, 10 HP. The pump manufacturer has provided the pump curve. Their persons visited our site for commissioning of this pump. The problem is that the data point of commission test comes a bit lower than the pump curve. Can any body suggest why this is...

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