Hi,
We are having few oversized equipment (Height more than 40 m) where due to logistic constraints many vendor's are proposing that they will fabricate the equipment in shop, perform Hydrotest, cut in two pieces, transport them to site, carry out final weld joint at site and perform Localized...
As per ASME Sec. VIII Div. 1 - App. 2 -> 2-1,
"The hub thickness of weld neck flanges designed to this Appendix shall also comply with the minimum thickness requirements in Subsection A of this Division", i.e. small hub thickness (g0) shall be checked as per UG-27.
For flange design we consider...
We are having a case where,
Hemispherical Dished End = Seamless
Hemispherical Dished End to Shell Joint = No radiography
We have three queries:
1. As this Hemispherical Dished End to Shell welded joint is of Category-A, neither clause UW-11(a)(5)(-b) nor UW-12(d) will be applicable. Is our...
In what conditions Cladding is preffered on Weld Overlay for Tubesheets?
One reason may be compatibility of materials w.r.t. welding.
Eg., as Titanium is not weldable with Non-Titanium materials, the tubesheet is required to be cladded.
Are there any other factors which decides when to go...
In what conditions Cladding is preffered on Weld Overlay for Tubesheets?
One reason may be compatibility of materials w.r.t. welding.
Eg., as Titanium is not weldable with Non-Titanium materials, the tubesheet is required to be cladded.
Are there any other factors which decides when to go for...
Find attached snapshot of FEA Analysis for Bracket Supported equipment.
We wish to check adequacy of Thickness for Support Bracket Gusset in FEA.
we wish to know Allowable Limits for Localized Stresses in Gussets of Support Bracket.
Being a non-pressure part, what will be the Allowable...
As per ASME Sec. VIII Div. 2 -> Annex 3-F.1.2, following formulae are specified to calculate the "design number of design cycles" (N) from Equation (3-F.1),
N =10^X
where,
X = (C1 + C3.Y + C5.Y^2 + C7.Y^3 + C9.Y^4 + C11.Y^5) / (1 + C2.Y + C4.Y^2 + C6.Y^3 + C8.Y^4 + C10.Y^5)
Y = (Sa / Cus)(Efc /...
Generally is it a practice that either Insert Plate or RF Pad is used to satisfy reinforcement requirement.
However, is it acceptable if both Insert Plate & RF Pad are used together to satisfy reinforcement requirement?
Ashay Kadam
Manager
Mechanical Department
Uhde India Private Limited...
Dear All,
Good Day!!!
As per ASME Sec. VIII Div. 1, UHX-13.9.3(d) it is specified to analyse only Loading cases 1 to 3 when Tubesheet is considered to be Simply Supported.
"UHX-13.9.3(d) Repeat Steps 1–7 for loading cases 1–3, with the following changes to Step 2, until the tubesheet stress...
I observed a conflict in two clauses of ASME Sec. VIII Div. 1 UCS-66 as follows:
UCS-66 (a)(3): The governing thickness of nonwelded parts, such as bolted flanges, tubesheets and flat heads, is the flat component thickness divided by 4.
FIG. UCS-66.3 (c): tg2 = tc;
where, tc = thickness of...
I have observed following conflict regarding Bolt Spacing & Bolt Correction Factor in Flange Design for Lethal Service as per ASME Sec-VIII Div-1 App-2, Clause 2-5 & 2-6.
As per App-2, Clause 2-5 (d),
"For vessels in lethal service or when specified by the user or his designated agent, the...
This is regarding Flanged & Flued Thick-Walled Expansion Joint Thickness for S&T Heat Exchangers.
As per industry practice Thick Joints have thickness equal or near to Shell thickness.
However, ASME Section VIII Div. 1 App-5 does not specify any upper or lower limit on Expansion Joint...
I have a query regarding Impact Testing of Duplex SS Material.
As per ASME Section VIII Div. 1, Clause UHA-51(d)(3) Impact testing is exempted for Duplex SS as follows:
for the following steels in all product forms at MDMTs of −20°F (−29°C) and warmer:
(a) austenitic ferritic duplex steels...
We are designing a vessel on which Half-Pipe spiral coil jacket is provided on shell from BTL upto half of shell length.
Hydrotest pressure for Half-Pipe spiral coil jacket is considerably high.
We wish to know how to check shell thickness adequacy during Hydrotest of Half-Pipe spiral coil...
In one of our equipment UNS S32205 MOC is applicable.
Hence, for forgings we are using SA 182 F60 which is corresponding MOC for UNS S32205.
However, we found that though this MOC is listed in ASME SEC. II PART-A, stress values fo the same are not available in ASME SEC. II PART-D.
For...
We are designing one S&T heat exchanger with Carbon Steel MOC.
The Design MDMT for shell side is -29 degree C.
Tubesheet MOC is SA 266 Gr. 2 & its thickness is 67mm.
We can not take Impact Testing exemption as per UG-20(f) as specified in the project documents.
When we designed the heat...
We are designing one S&T heat exchanger with Carbon Steel MOC.
The Design MDMT for shell side is -29 degree C.
Tubesheet MOC is SA 266 Gr. 2 & its thickness is 67mm.
We can not take Impact Testing exemption as per UG-20(f) as specified in the project documents.
When we designed the heat...
