154525768-torispherical-head.pdf
TRANSCRIPT
THE ANUP ENGG. LTD.
ITEM NO. : - DATE : 30/7/05
NOMENCLATURE REFERENCES
P= Internal Design Pressure 1.00 MPa
T = Design Temperature 60.00OC UG-20
Di = Inside Diameter of Vessel 1000.00 mm
Ci = Corrosion Allowance Internal 3.00 mm
Material Of Construction SA 516M GR 485
S = Maximum Allowable Stress At Design Temp. 138.00 MPa (SEC. II D, TABLE 1A)
L = Inside Spherical or Crown Radius (Corroded) 903.00 mm <= OD of Skirt 1020mm
r = Inside Knuckle Radius (Corroded) 153.00 mm >= 6% OD =61.2mm
(A) t1 = Head Thickness as Per UG-16(b)(4) = 2.5 ( COMPRESSED AIR SERVICE)
(B) THICKNESS OF TORISPHERICAL HEAD
Radiography SPOT UW-11(a)(5)(b)
Eht = Joint Efficiency 1.00 UW-12(d) (Seamless)
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 Eht - 0.2 x P )
= (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.
(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
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 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)
Forming Head [UCS-79 (d)]
Rf = Final center line radius, 153.00 mm
Ro = Original center line radius(infinity for flat plate) infinity mm
Extrim Fiber Elongation
= (75 x (th / Rf) x (1-(Rf/R0))
= ( 75 x 10 / 153 ) x ( 1 - 0) 4.90 %
Head is cold formed(Yes/no) Yes
Fiber elongation 4.90% < 5 %
Vessel carries lethal substances (Yes/no) no
Impact testing is required (Yes/no) no
Greater than 10% reduction in thickness (Yes/no) Yes
Formed between 120 and 480 0C no
Shell is greater than 16mm thick before forming no
Heat Treatment Required ?Yes
If Actual thickness of Head after
forming < 9 mm.
If Actual thickness of Head after
forming < 9 mm.
THICKNESS OF TORISHERICAL TOP HEAD
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.
b) Material SA 516M Gr 485 having specified minimum tensile strength 485 MPa is not exceeding
500 MPa , S =138 MPa is OK.
158599319.xls.ms_office/TORISPHERICAL HEAD CHECKED BY APPROVED BY
THE ANUP ENGG. LTD.
NOMENCLATURE REFERENCES
P= Internal Design Pressure 1.00 MPa
T = Design Temperature 60.00OC UG-20
Di = Inside Diameter of Vessel 1000.00 mm
Ci = Corrosion Allowance Internal 3.00 mm
Material Of Construction SA 516M GR 485
S = Maximum Allowable Stress At Design Temp. 138.00 MPa (SEC. II D, TABLE 1A)
L = Inside Spherical or Crown Radius (Corroded) 903.00 mm <= OD of Skirt 1020mm
r = Inside Knuckle Radius (Corroded) 153.00 mm >= 6% OD =61.2mm
(A) t1 = Head Thickness as Per UG-16(b)(4) = 2.5 ( COMPRESSED AIR SERVICE)
(B) THICKNESS OF TORISPHERICAL HEAD
Radiography SPOT UW-11(a)(5)(b)
Ehb = Joint Efficiency 1.00 UW-12(d) (Seamless)
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 )
= (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.
(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)
Forming Head [UCS-79 (d)]
Rf = Final center line radius, 153.00 mm
Ro = Original center line radius(infinity for flat plate) infinity mm
Extrim Fiber Elongation
= (75 x (th / Rf) x (1-(Rf/R0))
= ( 75 x 10 / 153 ) x ( 1 - 0) 4.90 %
Head is cold formed(Yes/no) Yes
Fiber elongation 4.90% < 5 %
Vessel carries lethal substances (Yes/no) no
Impact testing is required (Yes/no) no
Greater than 10% reduction in thickness (Yes/no) Yes
Formed between 120 and 480 0C no
Shell is greater than 16mm thick before forming no
Heat Treatment Required ?Yes
If Actual thickness of Head after
forming < 9 mm.
If Actual thickness of Head after
forming < 9 mm.
THICKNESS OF TORISHERICAL BTM. HEAD
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.)
b) Material SA 516M Gr 485 having specified minimum tensile strength 485 MPa is not exceeding
500 MPa , S =138 MPa is OK.
158599319.xls.ms_office/TORISPHERICALBTM. HEAD CHECKED BY APPROVED BY