Not necessarily.
Most of the time ID template is prepared.
Most vessels and heat exchangers are ID matched with the adjacent shells and hence ID templates are widely used. OD template is used only when there is a pronounced concaving dimple on the surface.
The template that is used by the bending machine operator and the template used for checking the profile of the skelp after bending and the template used for checking the shell course in tacked condition and after welding has the same curvature profile. While the chordal length of the template...
For SA-105 flanges, in ASME Sec Viii Div 1, there is no explicit requirement for NDE other than thee need to conduct Visual Examination, this requirement comes from UG 93 (d). Flange face finish shall be assessed as per ASME/ANSI B46.1 (This is from B16.5 clause 6.4.5).
In addition to the...
UG 80 (a1), UG (a2) and UG 80 (b) and Figure UG-29.2 of ASME Sec Viii Div 1. This is for checking the profile of the generally used shapes in a pressure vessel when external pressure is present, in addition UG 81 is also applicable. For items under internal pressure, UG 80 (a1) UG (a2), UG 81
ASME Sec VIII Div 1 Table UG 79-1 and clause UG 79 may help.
Let us assume the thickness is 25 mm and the shell diameter is 2500 ID then the % strain as per UG 79-1 for a cylindrical shell (Being formed from a flat plate)= 50 * 25/2500 % = 0.5% (Strain). While you may use the above to find the...
Q: May i know if there is a chart for Tolerance in Vessel Tank Fabrication.
A: In ASME Sec VIII Div 1 there is no such chart.
Q: May i know the tolerance of a dished Bottom head plate 6mmt with a height of 294 mm and what is the curvature tolerance circumference is 10711. I am using ASME VIII...
Dear experts,
In the mechanical datasheet of equipment, one can see the value for corrosion allowance. When one enquires the mechanical engineer who prepared the datasheet on the basis of providing certain value, reference is made to process datasheet, if you ask the process guys, they refer...
Dear experts,
I am conversant with the ASME UW 2 requirements and the definitions given therein including the details in various footnotes (general notes, inside ASME Sec VIII Div 1). Mechanical discipline engineers get the information on the service from the process data sheet, which is...
6A Valves or 6D Valves or API 600 Valves or ISO 17292 or etc etc
If API 6A, the data sheet will show you the temp classs and this is given in alphabet such as "K", "L" etc K signifies -60, L signifies -46 and so on.
From ISO 15589-2
Cables should be copper-cored, and shall be insulated and sheathed to withstand the prevailing chemical and mechanical conditions. The minimum conductor size for measurement cables shall be 4 mm2. Cables shall be sized such that no excessive voltage drops occur which reduce the...
NACE RP 0403 (SP0403) is for Avoiding Caustic Stress Corrosion Cracking of Carbon Steel Refinery Equipment and Piping
Does SP0403 apply to fittings?
If the fitting is going to be used in Caustic service and if the contract that you entered says that NACE RP/SP 0403 is applicable for a given...
1) Comparing Heat treatment conditions
A) An item (SS 304) procured under A276 can be
Condition A—Annealed
Condition S—Strain Hardened—Relatively light cold work
Condition B—Relatively severe cold work
B) An item (SS 304) procured under A 479 can be
Annealed
Strain Hardened Level 1
C) An item...
While what fshnvce says may be true in some cases, one should not generalize.
Inclusion of a particular product form for valves is not done without knowing the consequences. Some times it is better to have cast or Forged product form as compared to items made from rolled product.While the cast...
Photograph of broken Tip attached. http://files.engineering.com/getfile.aspx?folder=3186490b-54aa-47c2-bae5-7c4b1c90f614&file=Chock_valve_WC_Failure.pdf
Even in the event of extreme throtelling, the stem tip is not supposed to have any pressure acting on it since the valve is open. Only load that acts on the Stem tip is the flow impingement
That is why i was wondering about the applicability of Wake frequency calculation.
I did see some...
Recently I came across Choke valve Failures. The valves were in service for less than 1 year. In 2 cases the hand wheels were rotating freely, so the valves were opened and it was observed that the Stem tip made of Solid (HIP) Tungsten Carbide had broken. The tungsten carbide was attached to 410...
Although there is a change in direction of flow in a Choke valve, due to the reduction in pressure Choke, there would be high flow velocity. There is a possibility the stem may get subjected to flow induced vibration, hence is it necessary to conduct Wake Frequency Calculations for Choke Valve...
ISO 15156-3 does not list Tungsten Carbide as one of the qualified material, but it is observed most of the Choke Valve suppliers offer Tungsten carbide Stem Tip (Needle tip) as Solid Tungsten Carbide. It is alomost an industry practice.
Also it is understood this Solid Tungsten Carbide is HIP...
8" Dia x 1/2 " ASTM A 53 is getting welded to another 8'x 1/2" thick ASTM A 56 tubular :: Butt joint (CJP)
Refer to table 4.2 of AWS D 1.1
WPS indicates Minimum diameter as 4" and Maximum diameter as unlimited. This WPS is supported by PQR, the PQR is performed on 6" x Sch 120 (14 mm thick)...
