128793750 torispherical head thickness calculation problem

7/22/2019 128793750 Torispherical Head Thickness Calculation Problem

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1. Torispherical Head Thickness Calculation problem, pls help meVessel ID: 2100 mmLength (T/T): 3900 mm

Thickness: 6 mm (considered)Vessel Type: Horizontal Cylindrical with Torispherical Dish End

I manually calculate thisInside Crown Radius of the Torispherical is ( L ): 2112 (OD of the Vessel) &

Inside Knuckle Radius is ( r ) 126.72 (6% of Inside Crown Radius),As per ASME Sec VIII Div 1 UG 32 (e)

The condition ts/L 0.002 is satisfiedAnd the formula for the thickness calculation is tp = 0.885 P L / S E 0.1P

-------------------------------------------But as per ASME Sec VIII Div 1 Appendix (1- 4)

The same condition is ts/L 0.002

The L/r ratio is involves .L /r ratio is inside crown radius to the inside knuckle radius, used in Table 1-4.2Thickness formula ist p = P L M / 2 S E 0.2 P

and L/r = above 16 means M factor calculate separately..for another formulain App 1-4

-------------------------------------------In my case the L/r is 16.6 and I have to calculate the M factor value

separately.-----------------------------------------------------------------

Here my questions are,1. Is it wrong using thicknesses formula tp = 0.885 P L / S E 0.1P. in this condition (L/r is 16.6) as per ASME sec VIII div -1 UG -32 (e) .Why

because I already consider the inside knuckle radius is 6% inside crown radiusas per the code.

2. As per UG -32(e) and App 1-4, when I go for these L/r ratio?Please help me in this query and am expecting your comments with referencesplease ..

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4. 01-07-2011, 06:11 AM#2cpchonburi

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Please find below Interpretation. May be help.

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6. 01-07-2011, 07:08 AM#3rcmathews


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In short:

1. UG-32 formula applies to torispherical heads that are in a specific subset that

the inside crown radius = the outside diameter of the skirt and the inside

knuckle radius is 6% of the inside crown radius. Please note that the paragraphstates ICR is EQUAL to OD and the IKR IS 6% of ICR. If your head is a trueASME F&D and meets these criteria, then use this formula.2. Appendix 1-4 exists to deal with torispherical heads that have differinggeometries, for example an 80/10 head, which has a crown that is 80% of the

skirt OD and a knuckle that is 10% of the skirt OD. One would use an 80/10head because it requires only about 2/3 the thickness that a true F&D head

requires.3. I always use App 1-4 first, then run UG-32e. Sometimes 1-4 is more liberalwith the required thickness. Please examine factor M formula in App 1-4d and

Table 1-4.2 of M values. Please contact me if you require additional help.

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8. 01-07-2011, 08:32 AM#4Sriram_be

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Thank You all for your valuable contribution.

Regards,

Sriram

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9. 01-07-2011, 07:58 PM#5rcmathews

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Restrictions of UG-32j

I failed to mention this in my post:Per UG-32j:

The inside crown radius cannot exceed the outside diameter of the skirt.The inside knuckle radius cannot be less than 6% of the inside crown radius.

Please review Table 1-4.2 of App 1. You will notice the max L/r ratio is 16 &2/3, which is 6%.

To the other respondent, thanks for the attached interpretations.

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10. 01-08-2011, 06:22 AM#6cpchonburi

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FYI-all dimension shall be in the corroded condition, if any.

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11.01-08-2011, 11:01 AM#7

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Originally Posted by Sriram_be

Vessel ID: 2100 mm

Length (T/T): 3900 mmThickness: 6 mm (considered)

Vessel Type: Horizontal Cylindrical with Torispherical Dish EndI manually calculate thisInside Crown Radius of the Torispherical is ( L ): 2112 (OD of the Vessel) &Inside Knuckle Radius is ( r ) 126.72 (6% of Inside Crown Radius),

As per ASME Sec VIII Div1 UG 32 (e)The condition ts/L 0.002 is satisfied

And the formula for the thickness calculation is tp = 0.885 P L / S E 0.1P-------------------------------------------But as per ASME Sec VIII Div1 Appendix(1- 4)

The same condition is ts/L 0.002The L/r ratio is involves .L /r ratio is inside crown radius to the inside knuckle radius, used in Table 1-4.2Thickness formula is

t p = P L M / 2 S E 0.2 P


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and L/r = above 16 means M factor calculate separately..for another formula in App 1-4

-------------------------------------------In my case the L/r is 16.6 and I have to calculate the M factor value separately.-----------------------------------------------------------------Here my questions are,1. Is it wrong using thicknesses formula tp = 0.885 P L / S E 0.1P. in this condition (L/r is 16.6) as per ASME sec VIII div -1 UG -32 (e) .Why because I already consider theinside knuckle radius is 6% inside crown radius as per the code.2. As per UG -32(e) and App 1-4, when I go for these L/r ratio?Please help me in this query and am expecting your comments with references please ..

hi!

Please find attached sample design calculation with torispherical head;

Internal Pressure Calculation Results :

ASME Code, Section VIII, Division 1, 2007 A-09

Torispherical Head From 10 To 20 SA-516 70 , UCS-66 Crv. B at 80 C

Inside Corroded Head Depth [h]:= L - sqrt( ( L - Di / 2) * ( L + Di / 2 - 2 * r ) )

= 1515.00-sqrt((1515.00-2106.00/2)*(1515.00+2106.00/2-2*93.72))= 466.278 mm.

M factor for Torispherical Heads ( Corroded ):= (3+sqrt((L+C)/(r+C)))/4 per Appendix 1-4 (b & d)

= (3+sqrt((1512.000 + 3.0000 )/(90.720 + 3.0000 )))/4= 1.7551

Note: r is less than 6% of the head skirt OD.

Please check UG-32(j) and UG-81 for Code compliance.

Required Thickness due to Internal Pressure [tr]:

= (P*L*M)/(2*S*E-0.2*P) per Appendix 1-4 (d)= (350.000*1514.9999*1.7551)/(2*137.90*1.00-0.2*350.000)

= 3.3755 + 3.0000 = 6.3755 mm.

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:= (2*S*E*t)/(M*L+0.2*t) per Appendix 1-4 (d)

= (2*137.90*1.00*5.0000)/(1.7551*1514.9999+0.2*5.0000)

= 518.381 KPa.

M factor for Torispherical Heads ( New & Cold ):

= (3+sqrt(L/r))/4 per Appendix 1-4 (b & d)


7/8

= (3+sqrt(1512.000/90.720))/4

= 1.7706

Maximum Allowable Pressure, New and Cold [MAPNC]:

= (2*S*E*t)/(M*L+0.2*t) per Appendix 1-4 (d)= (2*137.90*1.00*8.0000)/(1.7706*1511.9999+0.2*8.0000)

= 823.611 KPa.

Actual stress at given pressure and thickness, corroded [Sact]:= (P*(M*L+0.2*t))/(2*E*t)

= (350.000*(1.7551*1514.9999+0.2*5.0000))/(2*1.00*5.0000)= 93.107 N./mm

Straight Flange Required Thickness:= (P*R)/(S*E-0.6*P) + c per UG-27 (c)(1)= (350.000*1053.0000)/(137.90*1.00-0.6*350.000)+3.000

= 5.677 mm.

Straight Flange Maximum Allowable Working Pressure:= (S*E*t)/(R+0.6*t) per UG-27 (c)(1)= (137.90 * 1.00 * 5.0000 ) / (1053.0000 + 0.6 * 5.0000 )

= 652.898 KPa.

Percent Elong. per UCS-79, VIII-1-01-57 (75*tnom/Rf)*(1-Rf/Ro) 6.334 %Note: Please Check Requirements of UCS-79 as Elongation is > 5%.

MDMT Calculations in the Knuckle Portion:

Govrn. thk, tg = 8.000 , tr = 5.000 , c = 3.0000 mm. , E* = 1.00Stress Ratio = tr * (E*) / (tg - c) = 1.000 , Temp. Reduction = 0 C

Min Metal Temp. w/o impact per UCS-66 -29 C

MDMT Calculations in the Head Straight Flange:

Govrn. thk, tg = 8.000 , tr = 3.968 , c = 3.0000 mm. , E* = 1.00

Stress Ratio = tr * (E*) / (tg - c) = 0.794 , Temp. Reduction = 11 C

Min Metal Temp. w/o impact per UCS-66 -29 CMin Metal Temp. at Required thickness (UCS 66.1) -40 C

Elements Suitable for Internal Pressure.

PVElite is a registered trademark of COADE, Inc. [2010]

I hope this is helpful for you.


8/8

Cheers,duazo2009

128793750 torispherical head thickness calculation problem

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