NB/T 47065.3-2018Vessel support - Part 3: Lug support (English PDF)

Foreword

This document was issued on 3 April 2018 by the National Energy Administration of the PRC and takes effect on 1 July 2018.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 23, Chinese classification J 74.

It replaces JB/T 4712.3-2007, which is superseded.

NB/T 47065-2018 Vessel supports is divided into the following five parts:

— Part 1: Saddle support (NB/T 47065.1-2018);

— Part 2: Leg support (NB/T 47065.2-2018);

— Part 3: Lug support (NB/T 47065.3-2018);

— Part 4: Supporting-type support (NB/T 47065.4-2018);

— Part 5: Rigid ring support (NB/T 47065.5-2018).

This document is Part 3 of NB/T 47065-2018: Lug support.

This part was drafted in accordance with the rules given in GB/T 1.1-2009 Directives for standardization — Part 1: Structure and drafting of standards.

This part replaces JB/T 4712.3-2007 Vessel supports — Part 3: Lug support. Compared with JB/T 4712.3-2007, the main technical changes are as follows:

— the materials adopted for the main body of the lug support are Q235B, S30408 and 15CrMoR;

— the permissible service temperature range of the lug support is given as minus 100 degrees Celsius to 300 degrees Celsius;

— the allowable bending moment [ML] of the shell at the support is given for allowable stresses of the equipment cylinder of [sigma] = 120 MPa, 140 MPa, 167 MPa and 185 MPa;

— a requirement has been added for the superposition of the loads arising from pipe thrust and from vertical seismic force.

This part was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).

The drafting of this part was organized by the Design Sub-committee of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China.

Drafting organization of this part: East China Engineering Science and Technology Co., Ltd.

Main drafters of this part: Liu Jixiang, Meng Yongxiang and Liu Xiaolin.

SAC/TC 262 is responsible for the interpretation of this part.

The previous editions of the standard replaced by this part are as follows:

— JB/T 4725-1992;

— JB/T 4712.3-2007.

1 Scope

NB/T 47065.3-2018 standardises lug supports for pressure vessels, replacing JB/T 4712.3-2007. A lug support is the bracket welded to the shell of a vertical vessel so that the vessel can rest on a structural steel frame or on a concrete platform, and because the load passes through a small welded attachment into a thin curved shell, its geometry and its allowable load cannot be left to the designer's judgement. The standard fixes the types of lug support and their designation, the range of vessel diameters each type serves, and the complete dimensions of every size: the gusset plates, the base plate, the pad plate that spreads the load into the shell, the bolt holes and the weld sizes. Tables of allowable load are given for each type and size, distinguishing the load the support itself can carry from the load the shell can accept, with the reinforcing pad and without it. The materials permitted for each component are listed with the temperature range over which they may be used, and the fabrication requirements cover cutting, forming, weld preparation, welding and the flatness and squareness of the finished assembly. A calculation appendix sets out how the pressure and load combination on the shell at the attachment is determined. Anyone designing, fabricating or checking vertical pressure vessels to Chinese practice uses this part to select and verify the supports.

1.1 This part specifies the structural types, the series parameters and dimensions, the materials, the marking, the technical requirements for manufacture and the selection instructions of lug supports.

1.2 This part is applicable to:

a) vertical cylindrical vessels with a nominal diameter not greater than 4 000 mm;

b) a permissible service temperature of minus 100 degrees Celsius to 300 degrees Celsius.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 985.1 Recommended joint preparation for gas welding, manual metal arc welding, gas shielded arc welding and beam welding.

GB/T 1804 General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications.

NB/T 47013.1 Nondestructive testing of pressure equipment — Part 1: General requirements.

NB/T 47013.4 Nondestructive testing of pressure equipment — Part 4: Magnetic particle testing.

NB/T 47013.5 Nondestructive testing of pressure equipment — Part 5: Penetrant testing.

NB/T 47015 Welding specification for pressure vessels.

3 Type characteristics

The type characteristics of lug supports are given in Table 1.

Table 1 — Type characteristics. The columns of the table are: type; support number; pad plate; cover plate; applicable nominal diameter DN in mm; support dimensions (see figure and table).

Short arm, type A, support numbers 1 to 5: a pad plate is provided; no cover plate is provided; applicable nominal diameter DN 300 mm to 2 600 mm; dimensions according to Figure 1 and Table 2.

Short arm, type A, support numbers 6 to 8: a pad plate is provided; a cover plate is provided; applicable nominal diameter DN 1 500 mm to 4 000 mm; dimensions according to Figure 2 and Table 2.

Long arm, type B, support numbers 1 to 5: a pad plate is provided; no cover plate is provided; applicable nominal diameter DN 300 mm to 2 600 mm; dimensions according to Figure 3 and Table 3.

Long arm, type B, support numbers 6 to 8: a pad plate is provided; a cover plate is provided; applicable nominal diameter DN 1 500 mm to 4 000 mm; dimensions according to Figure 4 and Table 3.

Extended long arm, type C, support numbers 1 to 3: a pad plate is provided; a cover plate is provided; applicable nominal diameter DN 300 mm to 1 400 mm; dimensions according to Figure 5 and Table 4.

Extended long arm, type C, support numbers 4 to 8: a pad plate is provided; a cover plate is provided; applicable nominal diameter DN 1 000 mm to 4 000 mm; dimensions according to Figure 6 and Table 4.

4 Series parameters and dimensions

4.1 Type A lug supports shall comply with Figure 1, Figure 2 and Table 2; type B lug supports shall comply with Figure 3, Figure 4 and Table 3; type C lug supports shall comply with Figure 5, Figure 6 and Table 4.

4.2 The thickness of the pad plate of the support shall meet the requirements of this part; in general it should be equal to the thickness of the shell course, and it may also be increased according to actual needs.

Figure 1 — Type A (support numbers 1 to 5). The views show the base plate of length l1 and width b1 and thickness delta1, the rib plate of width b2 and thickness delta2 and projection b4, the overall height H and the pad plate length l3, the eccentricity e, a vent hole of diameter 8 mm in the pad plate, the pad plate corner radius R equal to three times delta3, the bolt hole of diameter d at the distance s1 with a fixed 30 mm dimension, and in view A the pad plate of width b3 and thickness delta3 shaped to fit the outside profile of the shell, with the pad plate height l2.

Figure 2 — Type A (support numbers 6 to 8). Same arrangement as Figure 1, with the addition of a cover plate of thickness delta4 laid over the rib plates.

Figure 3 — Type B (support numbers 1 to 5). Long arm configuration without cover plate; the rib plate projects further from the shell than in type A.

Figure 4 — Type B (support numbers 6 to 8). Long arm configuration with a cover plate of thickness delta4.

Figure 5 — Type C (support numbers 1 to 3). Extended long arm configuration with cover plate; the base plate carries a single bolt hole.

Figure 6 — Type C (support numbers 4 to 8). Extended long arm configuration with cover plate; the base plate carries two bolt holes at the spacing c.

Table 2 — Series parameters and dimensions of type A supports; unit: mm. The columns are: support number; allowable load of the support body [Q] in kN for materials I, II and III; applicable vessel nominal diameter DN; height H; base plate l1, b1, delta1, s1; rib plate l2, b2, delta2; pad plate l3, b3, delta3, e; cover plate b4, delta4; anchor bolt d and specification; support mass in kg.

Table 2, support No. 1: [Q] = 12 kN for material I, 11 kN for material II, 14 kN for material III; DN 300 mm to 600 mm; H = 125; base plate l1 = 100, b1 = 60, delta1 = 6, s1 = 30; rib plate l2 = 80, b2 = 70, delta2 = 4; pad plate l3 = 160, b3 = 125, delta3 = 6, e = 20; cover plate b4 = 30, delta4 not applicable; anchor bolt d = 24, specification M20; support mass 1.7 kg.

Table 2, support No. 2: [Q] = 21 kN for material I, 19 kN for material II, 24 kN for material III; DN 500 mm to 1 000 mm; H = 160; base plate l1 = 125, b1 = 80, delta1 = 8, s1 = 40; rib plate l2 = 100, b2 = 90, delta2 = 5; pad plate l3 = 200, b3 = 160, delta3 = 6, e = 24; cover plate b4 = 30, delta4 not applicable; anchor bolt d = 24, specification M20; support mass 3.0 kg.

Table 2, support No. 3: [Q] = 37 kN for material I, 33 kN for material II, 43 kN for material III; DN 700 mm to 1 400 mm; H = 200; base plate l1 = 160, b1 = 105, delta1 = 10, s1 = 50; rib plate l2 = 125, b2 = 110, delta2 = 6; pad plate l3 = 250, b3 = 200, delta3 = 8, e = 30; cover plate b4 = 30, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 6.0 kg.

Table 2, support No. 4: [Q] = 75 kN for material I, 67 kN for material II, 86 kN for material III; DN 1 000 mm to 2 000 mm; H = 250; base plate l1 = 200, b1 = 140, delta1 = 14, s1 = 70; rib plate l2 = 160, b2 = 140, delta2 = 8; pad plate l3 = 315, b3 = 250, delta3 = 8, e = 40; cover plate b4 = 30, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 11.1 kg.

Table 2, support No. 5: [Q] = 95 kN for material I, 85 kN for material II, 109 kN for material III; DN 1 300 mm to 2 600 mm; H = 320; base plate l1 = 250, b1 = 180, delta1 = 16, s1 = 90; rib plate l2 = 200, b2 = 180, delta2 = 10; pad plate l3 = 400, b3 = 320, delta3 = 10, e = 48; cover plate b4 = 30, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 21.6 kg.

Table 2, support No. 6: [Q] = 148 kN for material I, 134 kN for material II, 171 kN for material III; DN 1 500 mm to 3 000 mm; H = 400; base plate l1 = 320, b1 = 230, delta1 = 20, s1 = 115; rib plate l2 = 250, b2 = 230, delta2 = 12; pad plate l3 = 500, b3 = 400, delta3 = 12, e = 60; cover plate b4 = 50, delta4 = 12; anchor bolt d = 36, specification M30; support mass 42.7 kg.

Table 2, support No. 7: [Q] = 173 kN for material I, 156 kN for material II, 199 kN for material III; DN 1 700 mm to 3 400 mm; H = 480; base plate l1 = 375, b1 = 280, delta1 = 22, s1 = 130; rib plate l2 = 300, b2 = 280, delta2 = 14; pad plate l3 = 600, b3 = 480, delta3 = 14, e = 70; cover plate b4 = 50, delta4 = 14; anchor bolt d = 36, specification M30; support mass 69.8 kg.

Table 2, support No. 8: [Q] = 254 kN for material I, 229 kN for material II, 292 kN for material III; DN 2 000 mm to 4 000 mm; H = 600; base plate l1 = 480, b1 = 360, delta1 = 26, s1 = 145; rib plate l2 = 380, b2 = 350, delta2 = 16; pad plate l3 = 720, b3 = 600, delta3 = 16, e = 72; cover plate b4 = 50, delta4 = 16; anchor bolt d = 36, specification M30; support mass 123.9 kg.

Note to Table 2: the support masses given in the table are calculated with the pad plate thickness delta3 given in the table; if the thickness delta3 is changed, the mass of the support shall be changed accordingly.

Table 3 — Series parameters of type B supports; unit: mm. The column arrangement is the same as that of Table 2.

Table 3, support No. 1: [Q] = 12 kN for material I, 11 kN for material II, 14 kN for material III; DN 300 mm to 600 mm; H = 125; base plate l1 = 100, b1 = 60, delta1 = 6, s1 = 30; rib plate l2 = 160, b2 = 70, delta2 = 5; pad plate l3 = 160, b3 = 125, delta3 = 6, e = 20; cover plate b4 = 50, delta4 not applicable; anchor bolt d = 24, specification M20; support mass 2.5 kg.

Table 3, support No. 2: [Q] = 21 kN for material I, 19 kN for material II, 24 kN for material III; DN 500 mm to 1 000 mm; H = 160; base plate l1 = 125, b1 = 80, delta1 = 8, s1 = 40; rib plate l2 = 180, b2 = 90, delta2 = 6; pad plate l3 = 200, b3 = 160, delta3 = 6, e = 24; cover plate b4 = 50, delta4 not applicable; anchor bolt d = 24, specification M20; support mass 4.3 kg.

Table 3, support No. 3: [Q] = 37 kN for material I, 33 kN for material II, 43 kN for material III; DN 700 mm to 1 400 mm; H = 200; base plate l1 = 160, b1 = 105, delta1 = 10, s1 = 50; rib plate l2 = 205, b2 = 110, delta2 = 8; pad plate l3 = 250, b3 = 200, delta3 = 8, e = 30; cover plate b4 = 50, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 8.3 kg.

Table 3, support No. 4: [Q] = 75 kN for material I, 67 kN for material II, 86 kN for material III; DN 1 000 mm to 2 000 mm; H = 250; base plate l1 = 200, b1 = 140, delta1 = 14, s1 = 70; rib plate l2 = 290, b2 = 140, delta2 = 10; pad plate l3 = 315, b3 = 250, delta3 = 8, e = 40; cover plate b4 = 70, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 15.7 kg.

Table 3, support No. 5: [Q] = 95 kN for material I, 85 kN for material II, 109 kN for material III; DN 1 300 mm to 2 600 mm; H = 320; base plate l1 = 250, b1 = 180, delta1 = 16, s1 = 90; rib plate l2 = 330, b2 = 180, delta2 = 12; pad plate l3 = 400, b3 = 320, delta3 = 10, e = 48; cover plate b4 = 70, delta4 not applicable; anchor bolt d = 30, specification M24; support mass 28.7 kg.

Table 3, support No. 6: [Q] = 148 kN for material I, 134 kN for material II, 171 kN for material III; DN 1 500 mm to 3 000 mm; H = 400; base plate l1 = 320, b1 = 230, delta1 = 20, s1 = 115; rib plate l2 = 380, b2 = 230, delta2 = 14; pad plate l3 = 500, b3 = 400, delta3 = 12, e = 60; cover plate b4 = 100, delta4 = 14; anchor bolt d = 36, specification M30; support mass 53.9 kg.

Table 3, support No. 7: [Q] = 186 kN for material I, 167 kN for material II, 214 kN for material III; DN 1 700 mm to 3 400 mm; H = 480; base plate l1 = 375, b1 = 280, delta1 = 22, s1 = 130; rib plate l2 = 430, b2 = 270, delta2 = 16; pad plate l3 = 600, b3 = 480, delta3 = 14, e = 70; cover plate b4 = 100, delta4 = 16; anchor bolt d = 36, specification M30; support mass 85.2 kg.

Table 3, support No. 8: [Q] = 254 kN for material I, 229 kN for material II, 292 kN for material III; DN 2 000 mm to 4 000 mm; H = 600; base plate l1 = 480, b1 = 360, delta1 = 26, s1 = 145; rib plate l2 = 510, b2 = 350, delta2 = 18; pad plate l3 = 720, b3 = 600, delta3 = 16, e = 72; cover plate b4 = 100, delta4 = 18; anchor bolt d = 36, specification M30; support mass 146.0 kg.

Note to Table 3: the support masses given in the table are calculated with the pad plate thickness delta3 given in the table; if the thickness delta3 is changed, the mass of the support shall be changed accordingly.

Table 4 — Series parameters of type C supports; unit: mm. In addition to the columns of Table 2 and Table 3, the base plate group also contains the bolt hole spacing c.

Table 4, support No. 1: [Q] = 28 kN for material I, 25 kN for material II, 32 kN for material III; DN 300 mm to 600 mm; H = 200; base plate l1 = 130, b1 = 80, delta1 = 8, s1 = 40, c not applicable; rib plate l2 = 250, b2 = 80, delta2 = 6; pad plate l3 = 260, b3 = 170, delta3 = 6, e = 30; cover plate b4 = 50, delta4 = 8; anchor bolt d = 24, specification M20; support mass 6.2 kg.

Table 4, support No. 2: [Q] = 49 kN for material I, 44 kN for material II, 57 kN for material III; DN 500 mm to 1 000 mm; H = 250; base plate l1 = 160, b1 = 80, delta1 = 12, s1 = 40, c not applicable; rib plate l2 = 280, b2 = 100, delta2 = 6; pad plate l3 = 310, b3 = 210, delta3 = 6, e = 30; cover plate b4 = 50, delta4 = 10; anchor bolt d = 30, specification M24; support mass 9.0 kg.

Table 4, support No. 3: [Q] = 65 kN for material I, 58 kN for material II, 75 kN for material III; DN 700 mm to 1 400 mm; H = 300; base plate l1 = 200, b1 = 105, delta1 = 14, s1 = 50, c not applicable; rib plate l2 = 300, b2 = 130, delta2 = 8; pad plate l3 = 370, b3 = 260, delta3 = 8, e = 35; cover plate b4 = 50, delta4 = 12; anchor bolt d = 30, specification M24; support mass 16.1 kg.

Table 4, support No. 4: [Q] = 105 kN for material I, 94 kN for material II, 120 kN for material III; DN 1 000 mm to 2 000 mm; H = 360; base plate l1 = 250, b1 = 140, delta1 = 18, s1 = 70, c = 90; rib plate l2 = 390, b2 = 170, delta2 = 10; pad plate l3 = 430, b3 = 320, delta3 = 8, e = 35; cover plate b4 = 70, delta4 = 12; anchor bolt d = 30, specification M24; support mass 28.9 kg.

Table 4, support No. 5: [Q] = 158 kN for material I, 142 kN for material II, 182 kN for material III; DN 1 300 mm to 2 600 mm; H = 430; base plate l1 = 300, b1 = 180, delta1 = 22, s1 = 90, c = 120; rib plate l2 = 430, b2 = 210, delta2 = 12; pad plate l3 = 510, b3 = 380, delta3 = 10, e = 40; cover plate b4 = 70, delta4 = 14; anchor bolt d = 30, specification M24; support mass 47.8 kg.

Table 4, support No. 6: [Q] = 188 kN for material I, 169 kN for material II, 216 kN for material III; DN 1 500 mm to 3 000 mm; H = 480; base plate l1 = 360, b1 = 230, delta1 = 24, s1 = 115, c = 160; rib plate l2 = 480, b2 = 260, delta2 = 14; pad plate l3 = 570, b3 = 450, delta3 = 12, e = 45; cover plate b4 = 100, delta4 = 14; anchor bolt d = 36, specification M30; support mass 74.8 kg.

Table 4, support No. 7: [Q] = 268 kN for material I, 241 kN for material II, 308 kN for material III; DN 1 700 mm to 3 400 mm; H = 540; base plate l1 = 440, b1 = 280, delta1 = 28, s1 = 130, c = 200; rib plate l2 = 530, b2 = 310, delta2 = 16; pad plate l3 = 630, b3 = 540, delta3 = 14, e = 45; cover plate b4 = 100, delta4 = 16; anchor bolt d = 36, specification M30; support mass 114.6 kg.

Table 4, support No. 8: [Q] = 292 kN for material I, 262 kN for material II, 335 kN for material III; DN 2 000 mm to 4 000 mm; H = 650; base plate l1 = 540, b1 = 360, delta1 = 30, s1 = 140, c = 280; rib plate l2 = 600, b2 = 400, delta2 = 18; pad plate l3 = 750, b3 = 650, delta3 = 16, e = 50; cover plate b4 = 100, delta4 = 18; anchor bolt d = 36, specification M30; support mass 181.3 kg.

Note to Table 4: the support masses given in the table are calculated with the pad plate thickness delta3 given in the table; if the thickness delta3 is changed, the mass of the support shall be changed accordingly.

5 Materials

5.1 The material of the pad plate should in general be the same as the material of the vessel.

5.2 The materials of the rib plates and of the base plate of the support are divided into three kinds; their code numbers are given in Table 5.

Table 5 — Material code numbers. The rows of the table give the material of the rib plates and base plate of the support and the permissible service temperature in degrees Celsius, for each of the three material codes I, II and III.

Material code I: rib plate and base plate material Q235B; permissible service temperature minus 20 degrees Celsius to 200 degrees Celsius.

Material code II: rib plate and base plate material S30408; permissible service temperature minus 100 degrees Celsius to 200 degrees Celsius.

Material code III: rib plate and base plate material 15CrMoR; permissible service temperature minus 20 degrees Celsius to 300 degrees Celsius.

6 Marking

6.1 Marking method. The marking is written as: NB/T 47065.3-2018, lug support x x - x, in which the first symbol is the type designation (A, B or C), the second symbol is the support number (1 to 8) and the third symbol is the material code (I, II or III).

Note 1: if the pad plate thickness delta3 differs from the dimension given in the relevant part of the table, this shall be stated in the part name column or in the remarks column of the equipment drawing.

Note 2: the materials of the support and of the pad plate shall be indicated in the material column of the equipment drawing, expressed in the form: support material / pad plate material.

6.2 Marking examples.

Example 1: type A, No. 3 lug support, support material Q235B, pad plate material Q245R. Marking: NB/T 47065.3-2018, lug support A3-I. Material: Q235B/Q245R.

Example 2: type B, No. 3 lug support, support material Q235B, pad plate material S30408, pad plate thickness 12 mm. Marking: NB/T 47065.3-2018, lug support B3-I, delta3 = 12. Material: Q235B/S30408.

Example 3: type C, No. 3 lug support, support material S30408, pad plate material S30408. Marking: NB/T 47065.3-2018, lug support C3-II. Material: S30408/S30408.

7 Technical requirements for manufacture

7.1 Welding may be carried out by shielded metal arc welding or by gas shielded arc welding (excluding the use of flux-cored wire). The welding consumables shall be selected with reference to the relevant standards according to the material of the support. The type and dimensions of the welded joints shall comply with the provisions of GB/T 985.1.

7.2 The welding of the lug support body shall use double-sided continuous fillet welds; the welding between the support and the vessel shell shall use continuous welds. The throat height of the fillet weld shall be approximately equal to 0.7 times the thickness of the thinner plate and shall not be less than 4 mm.

7.3 After welding, the surface of the weld metal shall be free from defects such as cracks, slag inclusions, gas pores and arc craters, and no residual slag or spatter shall remain on it.

7.4 The pad plate shall fit closely against the vessel wall.

7.5 The machining limit deviations of the anchor bolt holes of the support and the manufacturing tolerances of the other parts shall be in accordance with grade m and grade c respectively of GB/T 1804.

7.6 The surface roughness of the periphery of all the assembled and welded parts of the support shall be Ra 50 µm.

7.7 After the support has been assembled and welded, all the component parts shall be flat and shall not be warped.

7.8 When the material of the support body is 15CrMoR, the welding procedure shall comply with the requirements of NB/T 47015; when the vessel shell is subject to a heat treatment requirement, the pad plate of the support shall be welded to the vessel wall before heat treatment.

7.9 For materials whose lower limit of standard tensile strength Rm is not less than 540 MPa, and for pad plates and supports made of Cr-Mo steel, the surfaces of the continuous welded joints shall be subjected to 100 percent magnetic particle testing or penetrant testing, and shall be qualified to grade I in accordance with NB/T 47013.4 and NB/T 47013.5.

7.10 After the support has been assembled and welded, all the component parts shall be flat and shall not be warped.

8 Selection instructions

8.1 On the basis of the nominal diameter DN and of the method specified in Annex A, calculate the actual load Q (in kN) borne by the lug support; select a standard lug support from this standard according to this actual load value Q, so that Q is not greater than [Q].

8.2 In general, the support bending moment ML acting on the cylinder at the lug support shall be checked in accordance with formula (1) and formula (2).

Formula (1): ML is not greater than [ML].

Formula (2), for lined vessels: ML is not greater than [ML] divided by 1.5.

In the formulae: ML is the support bending moment acting on the cylinder at the lug support, in kN.m; it is obtained as ML equals Q multiplied by the quantity (l2 minus S1), divided by 10 raised to the power 3.

In the formulae: [ML] is the allowable bending moment of the cylinder at the lug support, in kN.m, to be taken from Annex B.

The symbols l2 and S1 are given in Table 2, Table 3 and Table 4.

8.3 A pad plate shall normally be provided for a lug support. When DN is not greater than 900 mm the pad plate may be omitted, but the following conditions shall be satisfied:

a) the effective thickness of the vessel shell is greater than 3 mm;

b) the material of the vessel shell and the material of the support have the same or similar chemical composition and mechanical properties.

8.4 The installation dimension D of the support may be calculated in accordance with Annex C.

A Annex A (Informative) Approximate calculation of the load actually borne by a lug support

A.1 The loads borne by a vertical vessel are shown in Figure A.1. The load Q actually borne by a lug support may be calculated approximately by formula (A.1): Q equals the sum of two terms, the first term being the quantity (m0 multiplied by g, plus Ge) divided by the product of k and n, and the second term being 2 multiplied by the quantity (p multiplied by h, plus Ge multiplied by Se), divided by the product of n and D; the sum is then multiplied by 10 raised to the power minus 3.

In the formula: Q is the load actually borne by the support, in kN.

In the formula: D is the installation dimension of the support, in mm.

In the formula: g is the acceleration due to gravity, taken as g equal to 9.81 m/s squared.

In the formula: Ge is the eccentric load (including the equivalent load caused by pipe thrust), in N.

In the formula: Se is the eccentric distance (including the equivalent eccentric distance caused by pipe thrust), in mm.

In the formula: h is the height from the point of application of the horizontal force to the base plate, in mm.

In the formula: k is the non-uniformity coefficient; when three supports are installed, k is taken as 1; when more than three supports are installed, k is taken as 0.83.

In the formula: m0 is the total mass of the equipment (including the mass of the shell and its attachments, of the internal medium and of the insulation layer), in kg.

In the formula: n is the number of supports.

In the formula: p is the horizontal force, taken as the larger of pw and of the sum pe plus 0.25 pw, in N.

In the formula: pe is the horizontal seismic force, in N.

In the formula: pw is the horizontal wind load, in N.

Figure A.1 — Loads borne by a vertical vessel. The figure shows the total height H0 of the vessel, the height h of the point of application of the horizontal force p above the base plate, the eccentric distance Se and the eccentric load Ge applied at the top of the vessel, the weight m0 multiplied by g acting at the centre, the support reaction Q, and the installation dimension D at the level of the supports.

A.2 When the pipe thrust on the vessel is relatively large, the load taken by the lug supports from the pipe thrust shall be calculated according to the direction and the magnitude of the thrust and according to the arrangement and orientation of the lug supports; the load value of the most heavily loaded lug support shall be determined, and this load value shall be added to the load value calculated by formula (A.1).

A.3 When the vertical seismic load has to be taken into account, the non-uniformity coefficient of the forces on the lug supports shall be included in the calculation; on this basis the value of the vertical seismic load borne by the lug support shall be determined, and this load value shall be added to the load value calculated by formula (A.1).

B Annex B (Informative) Allowable bending moment of the support as limited by the vessel shell

B.1 Field of application.

a) This annex applies to lug supports with pad plates fitted on steel welded cylindrical vessels subject to internal pressure;

b) it applies to vessel shells made of Q235B, S30408, 15CrMoR and similar materials.

B.2 Allowable stress of the vessel shell material.

a) This annex gives the values of the allowable bending moment [ML] of the support, as limited by the local stress in the shell after the lug support has been installed, for cylindrical shells whose equipment body material has an allowable stress [sigma] of 120 MPa, 140 MPa, 167 MPa or 185 MPa, under working conditions with calculation pressures p of 0.0 MPa, 0.6 MPa, 1.0 MPa and 1.6 MPa;

b) for other materials (according to their allowable stress values) and for other effective thicknesses, [ML] may be determined by the method of linear interpolation;

c) for working conditions at other pressure ratings, the designer shall check the strength of the shell against the actual calculated bending moment.

B.3 Tables of the allowable bending moment [ML] of the shell at the support.

a) Table B.1: allowable bending moment [ML] of the shell at type A and type B lug supports, for [sigma] equal to 120 MPa;

b) Table B.2: allowable bending moment [ML] of the shell at type A and type B lug supports, for [sigma] equal to 140 MPa;

c) Table B.3: allowable bending moment [ML] of the shell at type A and type B lug supports, for [sigma] equal to 167 MPa;

d) Table B.4: allowable bending moment [ML] of the shell at type A and type B lug supports, for [sigma] equal to 185 MPa;

e) Table B.5: allowable bending moment [ML] of the shell at type C lug supports, for [sigma] equal to 120 MPa;

f) Table B.6: allowable bending moment [ML] of the shell at type C lug supports, for [sigma] equal to 140 MPa;

g) Table B.7: allowable bending moment [ML] of the shell at type C lug supports, for [sigma] equal to 167 MPa;

h) Table B.8: allowable bending moment [ML] of the shell at type C lug supports, for [sigma] equal to 185 MPa.

Table B.1 — Allowable bending moment [ML] of the shell at type A and type B lug supports, for [sigma] equal to 120 MPa; unit: kN.m. The columns are: effective thickness of the cylinder in mm; lug support number; diameter in mm; and the values of [ML] for p equal to 0.0 MPa, 0.6 MPa, 1.0 MPa and 1.6 MPa. A dash means that the combination is not admissible.

Table B.1, cylinder effective thickness 4 mm, lug support No. 1: diameter 300 mm gives 2.65, 2.36, 2.16 and 1.84; diameter 350 mm gives 2.19, 1.90, 1.69 and 1.37; diameter 400 mm gives 1.82, 1.53, 1.33 and 1.01; diameter 500 mm gives 1.87, 1.50, 1.24 and 0.81; diameter 600 mm gives 1.84, 1.40, 1.08 and a dash.

Table B.1, cylinder effective thickness 4 mm, lug support No. 2: diameter 500 mm gives 3.04, 2.46, 2.03 and 1.35; diameter 600 mm gives 2.96, 2.27 and 1.77; diameter 700 mm gives 2.81, 2.01 and 1.43; diameter 800 mm gives 2.52, 1.66 and 1.05; diameter 900 mm gives 2.34, 1.43 and 0.79; diameter 1 000 mm gives 2.18 and 1.23; the remaining columns are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 3: diameter 700 mm gives 4.45, 3.24 and 2.34; diameter 800 mm gives 4.05, 2.70 and 1.73; diameter 900 mm gives 3.75, 2.32 and 1.28; diameter 1 000 mm gives 3.49 and 1.98; diameter 1 100 mm gives 3.27 and 1.70; diameter 1 200 mm gives 3.07 and 1.44; diameter 1 300 mm gives 2.91 and 1.21; diameter 1 400 mm gives 2.76 and 1.01; the remaining columns are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 4: diameter 1 000 mm gives 5.67 and 3.28; diameter 1 100 mm gives 5.31 and 2.79; diameter 1 200 mm gives 5.00 and 2.36; diameter 1 300 mm gives 4.71 and 1.98; diameter 1 400 mm gives 4.46 and 1.64; diameter 1 500 mm gives 4.23; diameter 1 600 mm gives 4.04; diameter 1 700 mm gives 3.84; diameter 1 800 mm gives 3.66; diameter 2 000 mm gives 3.31; the remaining columns are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 5: diameter 1 300 mm gives 7.89 and 3.40; diameter 1 400 mm gives 7.45 and 2.80; diameter 1 500 mm gives 7.06; diameter 1 600 mm gives 6.70; diameter 1 700 mm gives 6.39; diameter 1 800 mm gives 6.09; diameter 2 000 mm gives 5.54; diameter 2 200 mm gives 5.02; the remaining columns are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 6: diameter 1 500 mm gives 11.43; diameter 1 600 mm gives 10.83; diameter 1 700 mm gives 10.30; diameter 1 800 mm gives 9.81; diameter 2 000 mm gives 8.94; diameter 2 200 mm gives 8.15; the columns for 0.6 MPa, 1.0 MPa and 1.6 MPa are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 7: diameter 1 700 mm gives 15.37; diameter 1 800 mm gives 14.60; diameter 2 000 mm gives 13.28; diameter 2 200 mm gives 12.13; the columns for 0.6 MPa, 1.0 MPa and 1.6 MPa are dashes.

Table B.1, cylinder effective thickness 4 mm, lug support No. 8: diameter 2 000 mm gives 20.48; diameter 2 200 mm gives 18.69; the columns for 0.6 MPa, 1.0 MPa and 1.6 MPa are dashes.

Table B.1, cylinder effective thickness 6 mm, lug support No. 1: diameter 300 mm gives 4.81, 4.47, 4.24 and 3.87; diameter 350 mm gives 4.23, 3.88, 3.64 and 3.26; diameter 400 mm gives 3.91, 3.54, 3.28 and 2.87; diameter 500 mm gives 3.32, 2.89, 2.59 and 2.12; diameter 600 mm gives 2.81, 2.35, 2.03 and 1.54.

Table B.1, cylinder effective thickness 6 mm, lug support No. 2: diameter 500 mm gives 5.36, 4.69, 4.21 and 3.46; diameter 600 mm gives 4.33, 3.64, 3.15 and 2.38; diameter 700 mm gives 4.44, 3.60, 3.01 and 2.08; diameter 800 mm gives 4.43, 3.47, 2.79 and 1.72; diameter 900 mm gives 4.35, 3.27 and 2.52; diameter 1 000 mm gives 4.17, 3.01 and 2.19.

Table B.1, cylinder effective thickness 6 mm, lug support No. 3: diameter 700 mm gives 6.98, 5.68, 4.77 and 3.32; diameter 800 mm gives 6.96, 5.48, 4.43 and 2.74; diameter 900 mm gives 6.86, 5.20 and 4.02; diameter 1 000 mm gives 6.59, 4.78 and 3.48; diameter 1 100 mm gives 6.35, 4.39 and 2.99; diameter 1 200 mm gives 5.77, 3.78 and 2.38; diameter 1 300 mm gives 5.48, 3.42 and 1.96; diameter 1 400 mm gives 5.23 and 3.10.

Table B.1, cylinder effective thickness 6 mm, lug support No. 4: diameter 1 000 mm gives 10.57, 7.75 and 5.70; diameter 1 100 mm gives 10.22, 7.12 and 4.89; diameter 1 200 mm gives 9.33, 6.15 and 3.88; diameter 1 300 mm gives 8.85, 5.54 and 3.18; diameter 1 400 mm gives 8.42 and 5.00; diameter 1 500 mm gives 8.03 and 4.50; diameter 1 600 mm gives 7.67 and 4.04; diameter 1 700 mm gives 7.34 and 3.62; diameter 1 800 mm gives 7.04 and 3.22; diameter 2 000 mm gives 6.55 and 2.53.

Table B.1, cylinder effective thickness 6 mm, lug support No. 5: diameter 1 300 mm gives 14.76, 9.37 and 5.44; diameter 1 400 mm gives 14.04 and 8.42; diameter 1 500 mm gives 13.39 and 7.57; diameter 1 600 mm gives 12.79 and 6.78; diameter 1 700 mm gives 12.24 and 6.06; diameter 1 800 mm gives 11.73 and 5.39; diameter 2 000 mm gives 10.84 and 4.19; diameter 2 200 mm gives 10.09; diameter 2 400 mm gives 9.44; diameter 2 600 mm gives 8.78.

Table B.1, cylinder effective thickness 6 mm, lug support No. 6: diameter 1 500 mm gives 21.48 and 12.39; diameter 1 600 mm gives 20.54 and 11.09; diameter 1 700 mm gives 19.68 and 9.89; diameter 1 800 mm gives 18.88 and 8.79; diameter 2 000 mm gives 17.39 and 6.80; diameter 2 200 mm gives 16.11; diameter 2 400 mm gives 15.00; diameter 2 600 mm gives 13.98; diameter 2 800 mm gives 13.02; diameter 3 000 mm gives 12.12.

Table B.1, cylinder effective thickness 6 mm, lug support No. 7: diameter 1 700 mm gives 28.97 and 14.91; diameter 1 800 mm gives 27.81 and 13.23; diameter 2 000 mm gives 25.66 and 10.22; diameter 2 200 mm gives 23.72; diameter 2 400 mm gives 22.01; diameter 2 600 mm gives 20.53; diameter 2 800 mm gives 19.16; diameter 3 000 mm gives 17.85; diameter 3 200 mm gives 16.62; diameter 3 400 mm gives 15.44.

Table B.1 continues over the following pages of the annex with the further effective thicknesses of the cylinder, and Table B.2 to Table B.8 follow the same layout for the remaining allowable stress levels and for the type C lug supports.