Vessel Supports-Part 3: Lug Support
1 Scope
1.1 This Part specifies the structural types, series parameters and dimensions, permissible loads, materials, manufacture and inspection requirements and selection methods of the lug supports.
1.2 This Part is applicable to the vertical cylindrical vessels whose nominal diameter is not greater than 4000 mm.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Part of JB/T 4712. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 985 Basic forms and sizes of weld grooves for gas welding, manual arc welding and gas-shielded arc welding
GB/T 1804 General tolerances-tolerances for linear and angular dimensions without individual tolerance indications
JB/T 4730.1-2005 Nondestructive testing of pressure equipments-Part 1: General requirements
JB/T 4730 2-2005 Nondestructive testing of pressure equipments-Part 2: Radiographic testing
JB/T 4730.3-2005 Nondestructive testing of pressure equipments-Part 3: Ultrasonic testing
JB/T 4730.4-2005 Nondestructive testing of pressure equipments-Part 4: Magnetic particle testing
JB/T 4730.5-2005 Nondestructive testing of pressure equipments-Part 5: Penetrant testing
JB/T 4730.6-2005 Nondestructive testing of pressure equipments-Part 6: Eddy current testing
3 Type Characteristics
Type characteristics of lug supports are detailed in Table 1.
Table 1 Type characteristics
Type Support number Subplate Cover plate Applicable nominal diameter DN
mm Support dimension
(See Figure and Table)
Short arm A 1~5 Some None 300~2600 Figure 1 Table 3
6~8 Some 1500~4000 Figure 2
Long arm B 1~5 Some None 300~2600 Figure 3 Table 4
6~8 Some 1500~4000 Figure 4
Extension arm C 1~3 Some Some 300~1400 Figure 5 Table 5
4~8 1000~4000 Figure 6
4 Series Parameters and Dimensions
4.1 Type A lug supports shall be in accordance with Figure 1, Figure 2 and Table 2; Type B lug supports shall be in accordance with Figure 3, Figure 4 and Table 3; Type C lug supports shall be in accordance with Figure 5, Figure 6 and Table 4.
4.2 The thickness support subplate shall meet the requirements of this Part. Generally, the thickness of support subplate is the same as that of the cylinder, which may also be determined according to the actual requirements.
5 Materials
5.1 Generally, subplate materials shall be the same as the vessel materials.
5.2 Materials of support rib plate and base plate are divided into 4 kinds, with the codes detailed in Table 2.
Table 2 Material code
Material code I II III IV
Materials of support rib plate and base plate Q235A 16MnR 0Cr18Ni9 15CrMoR
Figure 1 Type A (support No. 1~5)
Figure 2 Type A (support No. 6~8)
Figure 3 Type B (support No. 1~5)
Figure 4 Type B (support No. 6~8)
Figure 5 Type C (support No. 1~3)
Figure 6 Type C (support No. 4~8)
Table 3 Series parameters and dimensions of Type A supports mm
Support number Permissible load of support
[Q], kN Nominal diameter of applicable vessel
DN Height
H Base plate Rib plate Subplate Cover plate Foundation bolt Support mass
kg
l1 b1 δ1 s1 l2 b2 δ2 l3 b3 δ3 e b4 δ4 d Specification
Q235A
0Cr18Ni9 16MnR
15CrMoR
1 10 14 300~600 125 100 60 6 30 80 70 4 160 125 6 20 30 — 24 M20 1.7
2 20 26 500~1000 160 125 80 8 40 100 90 5 200 160 6 24 30 — 24 M20 3.0
3 30 44 700~1400 200 160 105 10 50 125 110 6 250 200 8 30 30 — 30 M24 6.0
4 60 90 1000~2000 250 200 140 14 70 160 140 8 315 250 8 40 30 — 30 M24 11.1
5 100 120 1300~2600 320 250 180 16 90 200 180 10 400 320 10 48 30 — 30 M24 21.6
6 150 190 1500~3000 400 320 230 20 115 250 230 12 500 400 12 60 50 12 36 M30 42.7
7 200 230 1700~3400 480 375 280 22 130 300 280 14 600 480 14 70 50 14 36 M30 69.8
8 250 320 2000~4000 600 480 360 26 145 380 350 16 720 600 16 72 50 16 36 M30 123.9
Note: the support mass in this Table is calculated on the basis of thickness δ3 in this Table; the support mass will change with the δ3 thickness.
Table 4 Type B support series parameter list mm
Support number Permissible load of support
[Q], kN Nominal diameter of applicable vessel
DN Height
H Base plate Rib plate Subplate Cover plate Foundation bolt Support mass
kg
l1 b1 δ1 s1 l2 b2 δ2 l3 b3 δ3 e b4 δ4 d Specification
Q235A
0Cr18Ni9 16MnR
15CrMoR
1 10 14 300~600 125 100 60 6 30 160 70 5 160 125 6 20 50 — 24 M20 2.5
2 20 26 500~1000 160 125 80 8 40 180 90 6 200 160 6 24 50 — 24 M20 4.3
3 30 44 700~1400 200 160 105 10 50 205 110 8 250 200 8 30 50 — 30 M24 8.3
4 60 90 1000~2000 250 200 140 14 70 290 140 10 315 250 8 40 70 — 30 M24 15.7
5 100 120 1300~2600 320 250 180 16 90 330 180 12 400 320 10 48 70 — 30 M24 28.7
6 150 190 1500~3000 400 320 230 20 115 380 230 14 500 400 12 60 100 12 36 M30 53.9
7 200 230 1700~3400 480 375 280 22 130 430 270 16 600 480 14 70 100 14 36 M30 85.2
8 250 320 2000~4000 600 480 360 26 145 510 350 18 720 600 16 72 100 16 36 M30 146.0
Note: the support mass in this Table is calculated on the basis of thickness δ3 in this Table; the support mass will change with the δ3 thickness.
Table 5 Type C support series parameter list mm
Support number Permissible load of support
[Q], kN Nominal diameter of applicable vessel
DN Height
H Base plate Rib plate Subplate Cover plate Foundation bolt Support mass
kg
Q235A
0Cr18Ni9 16MnR
15CrMoR l1 b1 δ1 s1 c l2 b2 δ2 l3 b3 δ3 e b4 δ4 d Specification
1 30 40 300~600 200 130 80 8 40 — 250 80 6 260 170 6 30 50 8 24 M
20 6.2
2 45 55 500~1000 250 160 80 12 40 — 280 100 6 310 210 6 30 50 10 30 M
24 9.0
3 65 85 700~1400 300 200 105 14 50 — 300 130 8 370 260 8 35 50 12 30 M
24 16.1
4 120 150 1000~2000 360 250 140 18 70 90 390 170 10 430 320 8 35 70 12 30 M
24 28.9
5 170 210 1300~2600 430 300 180 22 90 120 430 210 12 510 380 10 40 70 14 30 M
24 47.8
6 220 270 1500~3000 480 360 230 24 115 160 480 260 14 570 450 12 45 100 14 36 M
30 74.8
7 280 330 1700~3400 540 440 280 28 130 200 530 310 16 630 540 14 45 100 16 36 M
30 114.6
8 340 400 2000~4000 650 540 360 30 140 280 600 400 18 750 650 16 50 100 18 36 M
30 181.3
Note: the support mass in this Table is calculated on the basis of thickness δ3 in this Table; the support mass will change with the δ3 thickness.
6 Marking
6.1 Marking methods
JB/T 4712.3-2007, lug support X X - X
Note 1: if the subplate thickness δ3 is different from the normal dimension, it shall be noted in the parts names column or remarks column of equipment drawing: e.g. δ3= 12.
Note 2: support and subplate materials shall be filled in the material column of equipment drawing, representation method: support material/subplate material.
6.2 Marking examples
Example 1: Type A, No. 3 lug support, support material is Q235A, subplate material is Q235A:
JB/T 4712 3-2007, lug support A3-I
Material: Q235A
Example 2: Type B, No. 3 lug support, support material is 16MnR, subplate material is 0cr18Ni9, subplate thickness is 12mm:
JB/T 4712.3-2007, lug support B3-II, δ3=12
Material: 16MnR/0Cr18Ni9
7 Manufacturing Requirements
7.1 Arc welding shall be adopted; electrode designation shall be selected according to the support component materials with reference to the relevant standards. Types and dimensions of welded joints shall be in accordance with GB/T 985.
7.2 Lug support shall adopt double-side continuous fillet welding; support and vessel enclosure shall adopt continuous welding. Fillet weld dimension shall be about 0.7 times of the thickness of the relatively thin plate and shall not be less than 4mm.
7.3 Post-welding weld metal surfaces shall be free from any defect such as crack, slag inclusion, weld beading, burn through and arc crater; weld zone shall be free from splash.
7.4 Subplate shall fit closely with vessel wall; the maximum partial clearance shall be less than or equal to 1mm.
7.5 Processing limit deviation of support bolt holes and their spacing as well as manufacturing tolerance of other parts shall be respectively in accordance with the class m and class c precision in GB/T 1804.
7.6 Peripheral roughness of all the assembled and welded parts of the supports is Ra 50μm.
7.7 After the supports are assembled and welded, each component shall be flat, smooth and not warping.
7.8 If heat treatment is required on the vessel enclosure, support subplate shall be welded on the vessel wall before heat treatment.
7.9 100% magnetic particle or penetrant testing shall be carried out on the surfaces of connection welds between the materials whose lower limit value of standard tensile strength Rm ≥540MPa and the Cr -Mo steel subplates or supports. The welds are qualified if the testing results meet the requirements of class I specified in JB/T 4730.4 and 4730.5.
8 Selection
8.1 Actual loads Q (kN) of lug supports shall be calculated according to the nominal diameter DN and the methods specified in Appendix A; a standard lug support shall be selected from the standard according to the actual load Q value, Q≤[Q].
8.2 Generally, the support bending moment ML of cylinder at the lug support shall be checked:
ML≤[ML]
As for the lined vessels:
Where,
ML——Support bending moment of cylinder at the lug support, kN·m;
[ML]——Permissible bending moment of cylinder at the lug support, see Appendix B, kN·m;
See Table 2, Table 3 and Table 4 for l2 and s1.
8.3 Generally, lug supports shall be arranged with subplates. When DN≤900mm, lug supports may not be arranged with subplates but must meet the following conditions:
a) Effective thickness of vessel enclosure shall be greater than 3mm;
b) Vessel enclosure materials shall have the same or similar chemical compositions and mechanical properties with the support materials.
8.4 Installation dimension D of supports may be calculated according to Appendix C.
Contents
Foreword i
1 Scope
2 Normative References
3 Type Characteristics
4 Series Parameters and Dimensions
5 Materials
6 Marking
7 Manufacturing Requirements
8 Selection
Appendix A (Informative) Approximate Calculation of Actual Bearing Load of Lug Support
Appendix B (Informative) Permissible Bending Moment of Support Restricted by the Vessel Enclosure
Appendix C (Informative) Installation Dimension of Lug Support
