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I am attaching the drawing for clear understanding. The red arrow points at the gap between IMPELLER & SHROUD. I want to estimate this clearance. The pump is 30 years old and we are unable to trace the original manufacturer. The original manufacturer has closed its business. We estimate the...

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...

still confused?

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 ...

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.

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...

The NDE guy says that it is a industry good practice.

MJCronin, The material is same ASTM A-234 WPB. However, as you know both will have different ID at root face. Would it hurts.

Having read all good advices, my NDE person now wants another advice. Is it good or worth full to do surface examination at root pass. Please comment.

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.

Thanks again.

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.

Thank you very much for all the good advice.

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...

I am reading all the reply very carefully. Thank you very much for the valuable advice provided by the all respectable members. All the answers were very relevant and in the right direction especially that of Duwe6. Best regards.

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...

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...

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...

Thanks to all. Now the pump is running smooth.

Yes, and the flanges are non standard , with one slip on and one blind to cover it.