Thank you for all your help.
According to what gr2vessels wrote i understand that "actual thicknees" is reffering to thickness of purchased material which is used to manufacture the equipment. This means i need to calculate minimum required thickness for pressure and add all required allowances...
Thank you for your reply.
I have tried to search for definition of "actual thickness" in the Code but couldn't find any. If Code states 2,5mm (actual thickness) i would like to understand what does it mean.
For me this may be understood in two ways:
1) Nominal thickness (ordered) minus...
Hello
Can someone be so kind to explain to me what is the definition of term "actual thickness" acc. to ASME Code? I am specific interested in Section IV HF-301.1(c)(3) and (c)(4) requirements.
Is it referring to thickness before fabrication (oredered material thickness) or to thickness...
Hello all,
I would like to ask couple of questions to clarify some doubts.
Is it allowed to hard stamp required marking directly on boilers shell? Is there any minimum thickness of shell specified? Will the allowance for 4mm character size still apply?
Acc. to HG-530:
required marking shall...
Dear all,
I have couple of questions to help me understand the ASME Sec IV Code better.
I would like to refer to HW-713(c) requirement.
What is exact explanation of wording "groove weld depth (if present)"?
a) Does it mean depth of bevel (weld preaparation) which secure required minimum...
Hello all
I would like to ask for a clarification of HLW-101 "Service Limits" paragraph.
I would like to make sure if my understanding is correct. I would like to know when a potable hot water heater is exempted from HLW stamping.
For example: if i have a potable water heater designed for...
Hello,
We are in the process of designing small shell&tube heat exchanger with two fixed tubesheets (shell diameter is 5") acc. to ASME Sec. VIII, Div.1 requirements. Whole construction is made entirely from copper grade C11000 and C12200. It looks that we would need to implement expansion...
Hello
I guess our interpretation was wrong. We based it on the requirements under figure where wording "for each weld" is missing.
Thank you all for your help.
Regards
Lukasz
Hello all
I have a question regarding UW-16(d)(1) welding requirement.
According to this requirement the dimension of t1 or t2 "for each weld" shall be not less than the smaller of 1/4in or 0.7 x tmin.
Our nozzle is welded acc. to Fig UW-16.1 (i) and we followed the note under it but the...
Thank you for the reply.
I just want to make sure that HF-301.1 minimum thickness requirement also apllies to shells and nozzles. This are parts which can easily by calculated.
For example: why i should use min. 1/4" thickness for 2-1/2" nozzle made from pipe?
For nozzles i think that...
Hello
I have a question to ask.
Acc. to ASME Sec. IV HF-301.1 requirement, any ferrous plate, or pipe used in lieu of plate, under any pressure shall be 1/4in (6mm).
In point a) and b) of this same requirement we can find some exceptions but they don't apply to my design because my maximum...
Thank you for your reply. What you described is what we are currently doing.
To be honest i do not understand why customer insists to have H-2 form instead of H-4 or even U-1 for secondary heat exchanger (economizer).
I talked with several authorized inspectors and opinions are mixed. Still...
Hello
Is it allowable to design pressure vessels without combustion process acc. to ASME Section IV requirements with H-2 form?
In preamble of Section IV we can read that this section is for boilers "directly fired" with fuel. Shall it be interprated that combustion process need to be within...
Hello once again
Thank you all for your responses
I will try to be more precise now and use an example.
Lets pretend that i want to make 2,5" NPT - internal nozzle from fi 85mm rolled stainless bar. I checked the rules in UG-27 and UG-45 and apllied them in my calculations. I also read the...
