THE ANUP ENGG. LTD. THICKNESS OF TORISHERICAL TOP HEAD ITEM NO. : NOMENCLATURE P= Interna Internall Design Design Pressur Pressure e 1.00 1.00 MPa O T = Design Temperature 60.00 C Di = Inside Diameter of Vessel 1000.00 mm Ci = Corrosion Allowance Internal 3.00 mm SA 516M GR GR 485 Material Of Construction S = Maximum Allowable Stress At Design Temp. 138.00 MPa L = Inside Spherical or Crown Radius (Corroded) 903.00 mm r = In I nside Knuckle Radius (Corroded) 153.00 mm (A) t1 = Head Thickness as Per UG-16(b)(4) = 2.5 ( COMPRESSED COMPRESSED AIR SERVICE) SERVICE) (B) (B) THIC THICKN KNE ESS OF TORI TORIS SPHE PHERICA RICAL L HEA HEAD Radiography SPOT Eht = Joint Efficiency 1.00 t2 = Required Thickness of Head Head (APPENDIX 1.4(d)) M = 1/4 [ 3 + SQRT ( L / r ) ] = 1/4 [ 3 + SQRT (903/153)] 1.36 t2 = ( P x L x M ) / ( 2 x S x Eht - 0.2 x P )
DATE : 30/7/05 REFERENCES UG-20
(SEC. II D, TABLE 1A) <= OD of Skirt 1020mm >= 6% OD =61.2mm
UW -11(a)(5)(b) UW -12(d) (Seamless)
= (1 (1 x 903 x 1.36) / ( 2 x 138 x 1 - 0.2 x 1) 4.44 mm Note: a) Torisspherical Heads with (t2 / L) = (4.44/903)=0.0049>=0.002 Therefore rule Appendix Appendix 1-4(d) can be used. b) Material SA 516M Gr 485 having specified minimum tensile strength 485 MPa is not exceeding 500 MPa , S =138 MPa is OK. (C) THICKNESS OF HEMISPHERICAL HEAD (UG-32(f)) E2 = Joint Efficiency Efficiency 1.00 UW-12(d) (Seamless) (Seamless) t3 = Required Thickness of Head Head (APPENDIX 1.4(d)) t3 = ( P x L ) / ( 2 x S x E2 - 0.2 x P ) = ( 1 x 903) / ( 2 x138 x 1 - 0.2 x1) 3.27 mm Eh1 = Top-Head to Shell Joint Efficiency 0.80 (Type-2, Category-B) t3= =( t / Eh1) = (3.27 / 0.8) 4.09 mm UG-32(b) t = Minimum Minimum Required Required Thickness Thickness of Head = Ma Max( t1, t2, t3) = Max(2.5,4.44,4.09) 4.44 mm th= Design Thickness of Head = (t + Ci) = (4.44+3) = 7.44 mm tmin= Minimum Minimum Thickness shown shown In Drawing Drawing 8.00 mm tnom= Nominal Nominal Thickness Thickness Prior to forming 10.00 mm UG-32 (j) a) The Inside crown radius L = 903 mm is not Greater than Outside Outside Diameter of Skirt =1020mm b) The inside knuckle radius of Torispherical head =153mm is not greater than 6% Outside dia. Of skirt =61.2mm c) The inside knuckle radius of Torispherical head = 153mm is not less than 3 x tnom = 30mm UG-32 (l) The head has been provide with 50mm Skirt length, through it is not mandatory as per UG-32(I) and Fig. UW-13.1. UG-32 (n) The taper at a welded joint within a formed head as per UW-9 is not required as difference between nominal thickness of shell (8mm) and head (10mm) at shell to head junction is not exceeding 2mm. Forming Head [UCS-79 (d)] Rf = Final center line radius, Ro = Original center line radius(infinity for flat plate) Extrim Fiber Elongation = (75 x (th / Rf) x (1-(Rf/R0)) = ( 75 x 10 / 153 153 ) x ( 1 - 0) Head is cold formed(Yes/no) Fiber elongation Vessel carries lethal substances (Yes/no) Impact testing is required (Yes/no) Greater than 10% reduction in thickness (Yes/no)
153.00 mm infinity mm
4.90 4.90 % Yes 4.90% < 5 % no no Yes If Actual thickness of Head after forming < 9 mm.
0
Formed between 120 and 480 C Shell is greater than 16mm thick before forming Heat Treatment Required ?
158599319.xls.ms_office/TORISPHERICAL HEAD
no no Yes
c ua c ness o forming < 9 mm.
CHECKED BY
ea a er
APPROVED BY
THE ANUP ENGG. LTD. THICKNESS OF TORISHERICAL BTM. HEAD NOMENCLATURE P= Internal Design Pressure 1.00 MPa O T = Design Temperature 60.00 C Di = Inside Diameter of Vessel 1000.00 mm Ci = Corrosion Allowance Internal 3.00 mm SA 516M GR 485 Material Of Construction S = Maximum Allowable Stress At Design Temp. 138.00 MPa L = Inside Spherical or Crown Radius (Corroded) 903.00 mm r = Inside Knuckle Radius (Corroded) 153.00 mm (A) t1 = Head Thickness as Per UG-16(b)(4) = 2.5 ( COMPRESSED AIR SERVICE) (B) THICKNESS OF TORISPHERICAL HEAD Radiography SPOT Ehb = Joint Efficiency 1.00 t2 = Required Thickness of Head (APPENDIX 1.4(d)) M = 1/4 [ 3 + SQRT ( L / r ) ] = 1/4 [ 3 + SQRT (903/153)] 1.36 t2 = ( P x L x M ) / ( 2 x S x Ehb - 0.2 x P )
REFERENCES UG-20
(SEC. II D, TABLE 1A) <= OD of Skirt 1020mm >= 6% OD =61.2mm
UW-11(a)(5)(b) UW-12(d) (Seamless)
= (1 x 903 x 1.36) / ( 2 x 138 x 1 - 0.2 x 1) 4.44 mm Note: a) Torisspherical Heads with (t2 / L) = (4.44/903)=0.0049>=0.002 Therefore rule Appendix 1-4(d) can be used. b) Material SA 516M Gr 485 having specified minimum tensile strength 485 MPa is not exceeding 500 MPa , S =138 MPa is OK. (C) THICKNESS OF HEMISPHERICAL HEAD (UG-32(f)) E2 = Joint Efficiency 1.00 UW-12(d) (Seamless) t3 = Required Thickness of Head (APPENDIX 1.4(d)) t3 = ( P x L ) / ( 2 x S x E2 - 0.2 x P ) = ( 1 x 903) / ( 2 x138 x 1 - 0.2 x1) 3.27 mm Eh2 = Bottom Head to Shell Joint Efficiency 0.80 (Type-2, Category-B) t3= =( t / Eh2) = (3.27 / 0.8) 4.09 mm UG-32(b) t = Minimum Required Thickness of Head = Max( t1, t2, t3) = Max(2.5,4.44,4.09) 4.44 mm th= Design Thickness of Head = (t + Ci) = (4.44+3) = 7.44 mm tmin= Minimum Thickness shown In Drawing 8.00 mm tnom= Nominal Thickness Prior to forming 10.00 mm UG-32 (j) a) The Inside crown radius L = 903 mm is not Greater than Outside Diameter of Skirt =1020mm b) The inside knuckle radius of Torispherical head =153mm is not greater than 6% Outside dia. Of skirt =61.2mm c) The inside knuckle radius of Torispherical head = 153mm is not less than 3 x tnom = 30mm UG-32 (l) The head has been provide with 50mm Skirt length, through it is not mandatory as per UG-32(I) and Fig. UW-13.1. UG-32 (n) The taper at a welded joint within a formed head as per UW-9 is not required as difference between nominal thickness of shell (8mm) and head (10mm) at shell to head junction is not exceeding 2mm.) Forming Head [UCS-79 (d)] Rf = Final center line radius, Ro = Original center line radius(infinity for flat plate) Extrim Fiber Elongation = (75 x (th / Rf) x (1-(Rf/R0)) = ( 75 x 10 / 153 ) x ( 1 - 0) Head is cold formed(Yes/no) Fiber elongation Vessel carries lethal substances (Yes/no) Impact testing is required (Yes/no) Greater than 10% reduction in thickness (Yes/no)
153.00 mm infinity mm
4.90 % Yes 4.90% < 5 % no no Yes If Actual thickness of Head after forming < 9 mm.
0
Formed between 120 and 480 C Shell is greater than 16mm thick before forming Heat Treatment Required ?
