# Blind Flange Design Calculations

Post on 10-Mar-2015

1.270 views

Category:

## Documents

Embed Size (px)

TRANSCRIPT

DESIGN CALCULATIONS OF HEAT EXCHANGERAccording to ASME Code, Sec. VIII, Div. 1, Edition 2001, Addenda 2002 / TEMA "R" 7th Edition 88. Designed by : Eng. Abdel Halim Galala, Design General Manager (Assistant)

Page : 76 of 136 Sheet : 1 of 6 Rev. : 0

Project : Design & Fabrication of Heat Exchanger for APRC Refinery Job No. : 7443-33 Dwg. No. : 7443-33-1A, Rev. 0 Exchanger : Residue Cooler, Type : AES, TEMA class : R

Sheet : 14

Date : 4.7.2003 Location : Alex. Client : APRCItem : E-323A/B & E-514C/D

P. Flat Unstayed Circular Blind Flange(Channel Cover) Thickness (item no. 22) [UG-34 & Fig. UG-34 Sketch (j)] [Attached by Bolts] Subjected to internal pressure Blind Cover Material, Clad Metal : SB171 UNS No. C63000 ASME SA266 Class 2 Stud bolt material SA 193 Grade B7 o o F C Design Temperature 140 60 o o Min. Design Metal Temperature, MDMT F C 53.6 12 o o F C Bolt-up and Gasket Seating Temperature 86 30 Assume corrosion allowance, C [UG-25] 0.19685 INCH 5 MM Kg/CM2G Operating Pressure (tube side) 56.8182 PSIG 4 Internal Design Pressure, P (MAWP) 71.7082 PSIG 5.04826 Kg/CM2G Allowable Stress of Bolt Material, SB : * at design temp.(operating condition), Sb * or at atmospheric temp./bolt-up temp. (gasket seating), Sa Allowable Stress of Flange Material : * at design temp.(operating condition), SfH * or at atmospheric temp./bolt-up temp. (gasket seating), SfC [Table 1A , SubPart 1 , ASME Sec. II , Part D] Joint efficiency, E Bolt Hole, Flange outside diameter, A Bolt circut diameter (B.C.D.), 25000 25000 20000 20000 1 1.10236 26.9685 24.5276INCH INCH INCH

PSIG PSIG PSIG PSIG

1760 1760 1408 1408

Kg/CM2G Kg/CM2G Kg/CM2G Kg/CM2G

28 685 623

MM MM MM

Fig. UG-34, Sketch (j) Figure (5)

No. of bolts Nominal bolt dia., dB Actual cross-sectional area of each bolt, Total actual cross-sectional area of bolts, Ab Flange face outer diameter Flange face inner diameter[TEMA Table D-5]

28 1 0.551 15.428 22.1654 19

INCH INCH2 INCH INCH INCH2

25.4 355.4832 9953.528 563 482.6

MM MM2 MM2

MM MM

DESIGN CALCULATIONS OF HEAT EXCHANGERAccording to ASME Code, Sec. VIII, Div. 1, Edition 2001, Addenda 2002 / TEMA "R" 7th Edition 88. Designed by : Eng. Abdel Halim Galala, Design General Manager (Assistant)

Page : 77 of 136 Sheet : 2 of 6 Rev. : 0

Project : Design & Fabrication of Heat Exchanger for APRC Refinery Job No. : 7443-33 Dwg. No. : 7443-33-1A, Rev. 0 Exchanger : Residue Cooler, Type : AES, TEMA class : R

Sheet : 14

Date : 4.7.2003 Location : Alex. Client : APRCItem : E-323A/B & E-514C/D

P. Flat Unstayed Circular Blind Flange (Channel Cover) Thickness (item no. 22) (cont.) [Attached by Bolts] [UG-34 & Fig. UG-34 Sketch (j)] Gasket Details: - Flat metal, jacketed asbestos filled, soft copp[er or brass - Outside diameter - Inside diameter = O.D - 2N - Width, N Gasket Dimensions: Basic gasket seating width, bO = N/2 [Table 2-5.2] Since bo > 1/4 ", Effective gasket seating width, b = 0.5 SQRT(bO) [Table [Table 2-5.1] Gasket Factor, m Min. Seating Stress, y [Table 2-5.1] Facing Sketch [Table 2-5.1] 0.125 22.0472 20.8661 0.59055 0.29528INCH INCH INCH INCH INCH

3.175 560 530 15 7.5

MM MM MM MM MM

0.2717 INCH 3.5 6500 PSIG (1a); Column II

6.901087 MM 457.6Kg/CM2G

Diameter at location of gasket load reaction, d ( d represnts G ) When bo is larger than 1/4", d = O.D.of gasket contact face - 2 b [Appendix 2-3]

21.5039

INCH

546.1978 MM

Factor depending upon method of attachment of head, C [Fig. UG-34, Sketch (j)] 0.3 Gasket moment arm, hG = (B.C.D - d)/2 = (C-G)/2 [Table 2-5.2] 1.51185

INCH

38.40109 MM

Calculating the Min. required Thickness of Blind Flange, t: [UG-34(c)(2)] t = d CP/SE +1.9W hG /SEd3 When using this formula, the thickness t shall be calculated for both operating conditions, and gasket seating, and the greater of the two values shall be used.

SA 193 Grade B7 o F 100 140 PSI 25000 ? ASME SA266 Class 2 o F 100 140 PSI 20000 ?

150 25000 200 20000

DESIGN CALCULATIONS OF HEAT EXCHANGERAccording to ASME Code, Sec. VIII, Div. 1, Edition 2001, Addenda 2002 / TEMA "R" 7th Edition 88. Designed by : Eng. Abdel Halim Galala, Design General Manager (Assistant)

Page : 78 of 136 Sheet : 3 of 6 Rev. : 0

Project : Design & Fabrication of Heat Exchanger for APRC Refinery Job No. : 7443-33 Dwg. No. : 7443-33-1A, Rev. 0 Exchanger : Residue Cooler, Type : AES, TEMA class : R

Sheet : 14

Date : 4.7.2003 Location : Alex. Client : APRCItem : E-323A/B & E-514C/D

P. Flat Unstayed Circular Blind Flange (Channel Cover) Thickness (item no. 22) (cont.)[Attached by Bolts] [UG-34 & Fig. UG-34 Sketch (j)]

Calculating the total bolt load, W (for circular heads): 1. For operating conditions, the value of P shall be the design pressure, and the value of S at the design temperature and W from Formula (3) of 2-5(e) shall be used. Flange Design Bolt Load for circular heads, W [Appendix 2-5(e)] For operating conditions, W = Wm1 (3) Wm1 = H + Hp = 0.785 G2P + (2b x 3.14 GmP) (1) [Appendix 2-5(e35243.2 Flange thicknesst = d CP / SE + 1.9Wh G / SEd^ 3

lb INCH

15986.05 Kg 21.74301 MM

0.85602

2. For gasket seating, P equals zero, and the values of S at atmospheric and W from Formula (4) of 2-5(e) shall be used.[UG-34(c)(2)]

P S [Appendix 2-5(e)] Flange Design Bolt Load for circular heads, W For gasket seating, W = 0.5(Am + Ab) Sa (4) Total required cross-sectional area of bolts, Am = Max (Am1,Am2) Required bolt load under atmospheric temp.conditions, Wm2 = 3.14bGy * Total cross-sectional area of bolts at root of thread requiired Am1 = Wm1/ Sb at operating conditions , * Total cross-sectional area of bolts at root of thread required gasket seating, Am2 = Wm2/ Sa Total required cross-sectional area of bolts, Am = Max (Am1,Am2) For gasket seating, W = 0.5(Am + Ab) Sa (4)

0 20000

PSIG PSIG

0 1408

Kg/CM2G Kg/CM2G

(2) 119246

lb

54089.04 Kg

1.40973

INCH2

909.4991 MM2

4.76983 4.76983 252473 1.29857 1.29857 1.29921 2.00787 2.48031

INCH2 INCH2

3077.304 MM2 3077.304 MM2 114519.9 Kg 32.98372 MM 32.98372 MM 33 MM 51 MM 63 MM

lbINCH INCH INCH INCH INCH

t = d CP / SE + 1 .9Wh G / SEd^ 3

t = max. of t of operating and gasket seating Use t without corrosion allowance Use t for construction including R.F. N.B. Check which the deflection is considered a governing thickness or not. The deflection is ehe governing thickness

DESIGN CALCULATIONS OF HEAT EXCHANGERAccording to ASME Code, Sec. VIII, Div. 1, Edition 2001, Addenda 2002 / TEMA "R" 7th Edition 88. Designed by : Eng. Abdel Halim Galala, Design General Manager (Assistant)

Page : 79 of 136 Sheet : 4 of 6 Rev. : 0

Project : Design & Fabrication of Heat Exchanger for APRC Refinery Job No. : 7443-33 Dwg. No. : 7443-33-1A, Rev. 0 Exchanger : Residue Cooler, Type : AES, TEMA class : R

Sheet : 14

Date : 4.7.2003 Location : Alex. Client : APRCItem : E-323A/B & E-514C/D

P. Flat Unstayed Circular Blind Flange (Channel Cover) Thickness (item no. 22) (cont.) [Attached by Bolts] [UG-34 & Fig. UG-34 Sketch (j)]

CONCLUSION:FLANGE SUMMARY Flange thickness (without C.A.) Use t for construction including R.F. For a proper design of flange : 1. You have to make a check for flange deflection. 1.29857 2.04724INCH INCH

32.98372 MM 52 MM

GASKET SUMMARY Gasket width, N Required cross-sectional of bolts, Am Actual cross-sectional area of bolts, Ab BOLT SUMMARY No. of bolts Size of bolt (the bolt size is represented by its actual cross-sectional area) Bolt hole dia. Total required cross-sectional area of bolts, Am Total actual cross-sectional area of bolts, Ab Actual cross-sectional area of bolt, [TEMA TABLE D-5]

0.59055 4.76983 15.428

INCH INCH2 INCH2

15 MM 3077.304 MM2 9953.528 MM2

28 1 1.125 4.76983 15.428 0.551

BoltINCH INCH INCH2 INCH2 INCH2

25.4 28.575 3077.304 9953.528 355.4832

MM MMMM2 MM2 MM2

Since the actual bolt area Ab > The required bolt area Am, the bolts are adequately enough. N.B. When using bolt with size Total required cross-sectional area of bolts, Am Total ctual cross-sectional area of bolts, Ab Actual cross-sectional area of bolt, [TEMA TABLE D-5] Since the actual bolt area Ab < The required bolt area Am, the bolts are inadequately enough. Edge distance, E from drawing = 1/2 (A - C) Min. Edge distance, E (for bolt size 0.75") Min. Edge distance, E (for bolt size 1") Min. edge distance, E (for bolt size 1-1/8") [TEMA Table D-5] Min. Edge distance, E (for bolt size 1.25") 0.75 4.76983 8.456 0.302 INCH INCH2 INCH2 INCH2 NA

1.22047 0.8125 1.0625 1.125 1.25

INCH INCH INCH INCH INCH

31 20.6375 26.9875 28.575 31.75

MM MM MM MM MM

DESIGN CALCULATIONS OF HEAT EXCHANGERAccording to ASME Code, Sec. VIII, Div. 1, Edition 2001, Addenda 2002 / TEMA "R" 7th Edition 88. Designed by : Eng. Abdel Halim Galala, Design General Manager (Assistant)

Page : 80 of 136 Sheet : 5 of 6 Rev. : 0

Project : Design & Fabrication of Heat Exchanger for APRC Refinery Job No. : 7443-33 Dwg. No. : 7443-33-1A, Rev. 0 Exchanger : Residue Cooler, Type : AES, TEMA class : R

Sheet : 14

Date : 4.7.2003 Location : Alex. Client : APRCItem : E-323A/B & E-514C/D

P. Flat Unstayed Circular Blind Flange (Channel Cover) Thickness (item no. 22) (cont.) [Attached by Bolts] [UG-34 & Fig. UG-34 Sketch (j)] Actual Bolt spacing, B (c/c) from drawing 2.74622 INCH Min. Bolt spacing, B (for bolt size 0.75") 1.75 I