ASME pressure vessel ispector

[cmsvessel]

Can somebody tell what do pressure vessel inspectors do? What is inspected for new fabricated vessels and in-service vessels? Will the inspector check the calculation, implement NDE and monitor hydraulic test?

 

[JStephen]

They don't need to check the calculations- but rather check that calculations were done. They don't implement the NDE- but check that you do. They will witness the hydrotest, not necessarily monitor it. Also check for welder qualifications, material marking, welding procedures, etc.

 

[cmsvessel]

It sounds like that the inspector is not reponsible for things have been done correctly but concerned about that required things by ASME have been done.
But waht about design surveyor, will the surveyor check the calcualtion as well as other things? Thanks a lot.

 

[metengr]

I disagree with JStephen. Authorized Inspectors are trained to know the equations in ASME Section I and VIII. So, they can and will check the application of the equations to assure the correct variables have been used, and to indeed check the math. Most of the AI's I deal with are degreed engineers and some have actual PE licenses.

 

[GenB]

metengr, I agree with you.-
The various sections of the Code explain in depth the requirements and responsibilities of an authorized inspector,
they must check for the safe boiler or vessel design and calculaions. it is true that the mfr is the final responsible for the product made.
it olso understood that the mfr know their QC responsibilities and perform all the required seps to make a sound product.
genb

 

[cmsvessel]

Is there any National Board certified here and let us know the defined scope of inspector's duties?
metengr, even though autorized inspectors are trained to know the code equations, it do not mean that inspectors will be responsible for coorect calculation.

 

[1969grad]

Vessel design calculations are normally submitted with the drawings during the approval process so the calculations should have already been checked by an engineer before fabrication is started.

That said, the vessel inspector will check that the calculations and drawings have been approved amoung the many documents that he verifies.

The inspector should be intimately familar with all the requirements of the ASME PV code and he vertifies that all requirements for both documentation and fabrication are met. As noted previously, documentation includes welding procedures, welder qualification, NDE records and procedures, etc.

The inspector does not perform any work directly but verifies that the fabricator has performed the fabrication and NDE inspections which meets all the code requirements.

 

[GenB]

you do not get it, The mfr is responsible for the correctedness, if the AI pass it (you wishing it does) and sign your data report and there is a mistake or error anywhere in the fabrication, the mfr is responsible for the product, the AI does not have any responsibility to the mfr for the correcteness.
the AI will answer to his/her boss and to the Nat'l Board, if
found liable for any big mistakes or Code violations, he/she will be discipline and possible loose the commission.
Now you know why the AI's are not so fouls and let you go easy.
genb

 

[1969grad]

Agreed.

We normally have a paragraph in our specs that says that even though the vessel passes inspection that the fabricator is still responsible for any errors or emissions.

with that said, once the vessel ships then the fabricator wants to get paid. when you do pay him then you loose leverage to fix anything on a timely basis. And, it is much easier to fix things in the shop than the field.

 

[lostsailor]

cms,
the AI's specific duties are referenced in the code of construction
Regards,
RLS

 

[GenB]

also read the data report, right before the AI signs,
I wish I was signing in that part of the data report!
no stress!
genb

 

[lostsailor]

GenB,
Be careful what you wish for, that disclaimer is worth about as much as the paper it's written on, when the mud starts to fly, it sticks to everyone it touches.
Regards,
RLS

 

[GenB]

Are you a Lawyer? sounds like it, the statement's support is on the Codes clearly.
genb

 

[lostsailor]

GenB
Nope, not a lawyer, just a realistic AI/ANI.
Regards,
RLS

 

[aclark]

I am an AI and have had a National Board commission for 30 years. I have the A B N S and I endorsments. I am also an ASME/National Review Team Leader.

If you wamt to know what the AI's duties are look at the codes of construction. Section VIII Div 1 look at UG-90. In addition review the National Board rules for Commissioned Inspectors, you can download it from the National Board web site.

The concept of third party Inspection was based on the AIA having and insuring intrest in the safe design and fabrication of pressure equipment. If the Code rules were followed the Insurance companies would have less claims and there would be a reduction in the loss of property and life.
This view has evolved over the years and I belive that the AIA's ASME and National Board have forgotten the orginal concept of why and how the relationship was formed. You must also remember that the ASME Code is only meaningful when a Jurisdiction has adopted it as law, otherwise it is just words on paper.

 

[lostsailor]

aclark,
Well put, the nature of the business is and has changed greatly since I entered it 20 years ago.
Regards,
RLS

 

[deanc]

The AI stays in the office,signs paperwork,and makes your life miserable. Bye the way "Where is my coffee".

This sound typical? If this is your view it only because you have not worked with this person or are unwilling to follow the requirements you agreed to.

The AI may have a wealth of valuable knowledge and resourses. It is also in the best interest of the AI for you to succeed.

So-Just Ask and you may be surprised. Most of us got the way we are(crusty and grouchy?) by experience and may be willing to help keep you on track.