IVANKO
Mechanical
- Aug 6, 2013
- 3
Hello to all the participants of this forum, and thank to anyone who will share his knowledge upon this subject.
Kinda of a complicated issue here. I apologize for the naive questions but I am fairly new here with pressure vessels. Also: I apologize for my non IVY league perfect english (I work in the USA but I was born in Europe). This being said.
1.The premises:
1.a. Our shop is ASME U-stamp certified.
1.b. We will purchase -from OEM- a 10" #150 6 ways "same side" flanged ASME transfer valve(shoe-type).
1.c. We will have to reposition ONE out of 6 nozzles of the valve's housing.
2. My early (possibly incorrect) assumptions:
2.a. This 6 ways - same side transfer valve is basically a small pressure vessel, with some mechanisms as internals.
2.b. in our shop we have the capability to reposition the nozzle, we have done many times -in the past- on other pressure vessels.
2.c. The transfer valve is ASME certified, therefore it is provided with the the U-stamp.
3. Questions, things that I am not sure about, issues, doubts.
3.a. So far, actually I am not sure that the transfer valve that we'll receive will be ASME U-stamped, thus could be considered as a pressure vessels at all extents. As a matter of fact, "common" ASME valves (such as ball/globe/gate/butterfly valves) although being ASME valves, they are not U-stamped, because they are not pressure vessels. Do I stand correct here?
3.b. In case the transfer valve that we'll receive won't be provided of an ASME U-stamp: how do we deal with it? Can we modify the housing by repositioning one nozzle?
3.c. In case the transfer valve that we'll receive will be provided of an ASME U-stamp:
3.c.I Can we reposition the nozzle?
3.c.II Do we have to go through the whole ASME procedure as for a new pressure vessel, or either can we give for granted that the vessel has already been U-stamped by the OEM therefore we provide a non conformity report just for the modified parts and an hydrotest and after it submit to the inspector only the calculations regarding the modification (nozzle repositioning)?
3.c.III Do we need a R-stamp? Is this considered as a repairing? Do all shops that have a U-stamp also have a R-stamp, or are there two different requirements where the former does not imply the first?
3.d.IV what are the obligations in case of a vessel repairing? do you add another name plate? do you add the R-stamp after the original U-stamp? What happens in case the vessel has to undergo two different repairing procedures? Do you add as many R-stamp as the repairing procedures?
Thank you for your help!
Kinda of a complicated issue here. I apologize for the naive questions but I am fairly new here with pressure vessels. Also: I apologize for my non IVY league perfect english (I work in the USA but I was born in Europe). This being said.
1.The premises:
1.a. Our shop is ASME U-stamp certified.
1.b. We will purchase -from OEM- a 10" #150 6 ways "same side" flanged ASME transfer valve(shoe-type).
1.c. We will have to reposition ONE out of 6 nozzles of the valve's housing.
2. My early (possibly incorrect) assumptions:
2.a. This 6 ways - same side transfer valve is basically a small pressure vessel, with some mechanisms as internals.
2.b. in our shop we have the capability to reposition the nozzle, we have done many times -in the past- on other pressure vessels.
2.c. The transfer valve is ASME certified, therefore it is provided with the the U-stamp.
3. Questions, things that I am not sure about, issues, doubts.
3.a. So far, actually I am not sure that the transfer valve that we'll receive will be ASME U-stamped, thus could be considered as a pressure vessels at all extents. As a matter of fact, "common" ASME valves (such as ball/globe/gate/butterfly valves) although being ASME valves, they are not U-stamped, because they are not pressure vessels. Do I stand correct here?
3.b. In case the transfer valve that we'll receive won't be provided of an ASME U-stamp: how do we deal with it? Can we modify the housing by repositioning one nozzle?
3.c. In case the transfer valve that we'll receive will be provided of an ASME U-stamp:
3.c.I Can we reposition the nozzle?
3.c.II Do we have to go through the whole ASME procedure as for a new pressure vessel, or either can we give for granted that the vessel has already been U-stamped by the OEM therefore we provide a non conformity report just for the modified parts and an hydrotest and after it submit to the inspector only the calculations regarding the modification (nozzle repositioning)?
3.c.III Do we need a R-stamp? Is this considered as a repairing? Do all shops that have a U-stamp also have a R-stamp, or are there two different requirements where the former does not imply the first?
3.d.IV what are the obligations in case of a vessel repairing? do you add another name plate? do you add the R-stamp after the original U-stamp? What happens in case the vessel has to undergo two different repairing procedures? Do you add as many R-stamp as the repairing procedures?
Thank you for your help!
