SL 37-1991 Technical requirements for eccentric hinged radial gates SL 37-91
Some standard content:
Industry Standard of the People's Republic of China
SL37-91
Technical Conditions for Eccentric Hinge Radial Gate
Issued on September 24, 1991
Ministry of Water Resources of the People's Republic of China
Implementation on January 1, 1992
Scope of Application·
Cited Standards…·
3—General Provisions…
3.2 Welding Materials
3.3 Castings and Forgings
Technical Requirements·
Welding requirements
Component manufacturing
Embedded parts manufacturing
Water-stop device manufacturing
Door leaf manufacturing
Hinge and crank arm manufacturing
Leg manufacturing
General assembly of gates
Gate corrosion protection
Gate acceptance·
Gate marking, packaging and transportation
Industry standard of the People's Republic of China
Technical conditions for eccentric hinge radial gates
SL 37—91
Scope of application
This technical condition applies to the manufacturing and acceptance of eccentric hinge radial gates with metal structures in water conservancy and hydropower projects (hereinafter referred to as gate manufacturing).
'Referenced standards
GB3274
GB5117
GB5118
GB1300
Ordinary carbon structural steel and low alloy steel hot rolled thick steel plates and strips Carbon steel welding rods
Low alloy steel welding rods
Stainless steel welding rods
Welding wires
Flux for submerged arc welding of carbon steel
GB5293
GB/T11350 Machining allowance of castings
Casting carbon steel parts for general engineering
GB11352
GB1176
Technical conditions for casting copper alloys
Basic types and dimensions of manual arc welding joints GB9853
GB986 Submerged arc welding Basic types and dimensions of joints Radiography and quality classification of steel fusion welded butt joints GB3323
GB1804 Tolerances and fits Limit deviations of dimensions without tolerances GB1228~1230 High-strength large hexagonal head bolts, large hexagonal nuts and washers for steel structures GB1231 Technical conditions for high-strength large hexagonal head bolts, large hexagonal nuts and washers for steel structures GB27 Hexagonal head bolts for reaming holes - Grade A and Grade B GB146.1 Standard gauge railway rolling stock limits GB146.2 Standard gauge railway building limits
GBJ236 Construction and acceptance specifications for welding projects of on-site equipment and industrial pipelines Ministry of Water Resources of the People's Republic of China Issued on September 24, 1991 and implemented on January 1, 1992
GB6414 Dimensional tolerances of castings
SL 37-91
ZBJ59002.3Hot cutting and gas cutting quality and dimensional deviationJB1152Ultrasonic flaw detection of butt welds of boilers and steel pressure vesselsJB3144Ultrasonic flaw detection of fillet welds of large-diameter pipe seats of boilersQ/ZB71'General technical conditions for forgings
3General provisions
3.1Steel
3.1.1Steel for structures must comply with the corresponding national or ministerial standards and have a correct and reliable factory certificate. Steel with unclear grades or no certificate of conformity shall be used only after passing the inspection. 3.1.2Steel plates with surface defects exceeding the relevant provisions of GB3274 shall not be used for the manufacture of gate bearings: 3.2Welding materials
3.2.1The welding rods used shall comply with the relevant provisions of GB5117, GB5118 and GB983. 3.2.2 Automatic welding wires shall comply with the relevant provisions of GB1300. 3.2.3 Flux must comply with the provisions of GB5293. 3.3 Castings and forgings
3.3.1 The chemical composition and mechanical properties of steel castings shall comply with the provisions of GB11352. The quality of copper castings shall comply with the provisions of GB1176.
3.3.2 The machining allowance of steel castings shall comply with GB/T11350.3.3.3 Steel castings shall be annealed or normalized before metal processing. 3.3.4 The important parts of steel castings such as the root of the web, corners and the intersection of ribs and walls, as well as the pressure-bearing processing surface, shall not have defects such as cracks and shrinkage. When the following defects exist, repair welding is allowed if the repair welding does not affect the performance:
a. There are defects such as holes on the pressure-bearing surface, the area of each hole does not exceed 3.0cm, the depth is less than 1/10 of the wall thickness at that place, and there is no more than one hole per 100cm, and the total area is not more than 2% of the area; b. There are defects such as holes on the non-pressure-bearing surface, the area of each hole does not exceed 5.0cm, the depth does not exceed 1/5 of the wall thickness at that place, and there is no more than one hole per 100cm* and area, not more than one; c. The shaft hole has defects such as holes, the single area of which does not exceed 2.0 cm, the depth does not exceed 1/10 of the wall thickness at that place, and there is no more than one defect in every 100 cm; d. There are defects such as holes on the non-machined surface, the single area of which does not exceed 8.0 cm, the depth does not exceed 1/5 of the wall thickness at that place, and the total area is not greater than 5% of the area;
3.3.5 The root of the spoke plate, corners and pressure-bearing machined surface of the eccentric hinge shall not have cracks and shrinkage. When there are the following defects, repair welding is allowed if they do not affect the performance after repair welding: a. There are defects such as holes on the pressure-bearing processing surface, the area of each defect shall not exceed 2.0cm, the depth shall not exceed 1/10 of the wall thickness at that place, and the total area shall not exceed 3% of the pressure-bearing area: 2
SL 37—91
b. There are defects such as holes on the non-pressure-bearing processing surface, the area of each defect shall not exceed 3.0cm, the depth shall not exceed 1/10 of the wall thickness at that place, and the total area shall not exceed 4% of the area; c. There are defects such as holes on the shaft hole, the area of each defect shall not exceed 1.0cm; the depth shall not exceed 1/10 of the wall thickness at that place, and the total area shall not exceed 2% of the area;
dl. There are defects such as holes on the non-processing surface, the area of each defect shall not exceed 5.0cm, the depth shall not exceed 1/10 of the wall thickness at that place, and the total area shall not exceed 4% of the area. :3.3.6 Before repairing welding of casting defects, the defective parts should be cleaned and repaired only after inspection by the technical department. The quality after repairing welding should meet the design requirements.
3.3.7 General forgings should comply with the provisions of Q/ZB71. .3.3.8 Repair welding is not allowed for defects in door leaf suspension shafts and hinge shaft forgings. The mechanical properties should comply with the requirements of the drawings. 4
Technical requirements
4.1 Welding requirements
4.1.1 Welds are divided into three categories according to the stress conditions and importance: Class I welds:
a. Butt welds of the web and flange plates of the door leaf main beam and support arm; b. Fillet welds of the assembly of the door leaf main beam and cross beam; C. Fillet welds of the connecting plate connecting the support arm and the door leaf main beam or hinge; d. Butt welds of the door leaf ear plate.
Class II welds:
a. Panel butt welds;
b. Fillet welds connecting the main beam of the door leaf and the wing plate and the web plate of the support arm; c. Fillet welds connecting the ear plate and the door leaf. Class IⅡ welds: welds in other parts except those specified in Class I and Class II. 4.1.2 Welders participating in Class I and Class II welds must pass the examination according to GBJ236 and obtain a certificate of qualification before they are allowed to engage in work.
4.1.3 The selection of welding materials and welding processes should be consistent with the requirements of the welds. When new materials are selected, process qualification tests should be carried out.
4.1.4 Before using welding rods and flux, they should be dried according to the instructions, and then kept warm at 100-150℃ for timely use. If placed in the air for more than 4 hours, they should be re-baked, and the number of re-baking should not exceed two times. 4.1.5 The type and size of the dry joint groove shall comply with the provisions of GB985 and GB986. 4.1.6 The groove of Class I and Class II welds shall generally be machined. If flame cutting is used, the cutting quality shall comply with the Class II standard in ZBJ59002·3.
4.1.7 The thick steel plates of the main beams, vertical beams and other parts of the door leaf shall be preheated before welding. The common preheating temperatures of thick steel plates before welding are shown in Table 1. The preheating width of each side of the groove shall not be less than 2 to 3 times the plate thickness. SL37-91
4.1.8 Whenever there is open-air construction, the wind force exceeds level 5 or rain and snow, which directly affect the welding quality, reliable measures should be taken to promote welding.
4.1.9 The number of repairs of Class I and Class II welds in the same part shall not exceed two times. The appearance quality of the weld shall comply with the provisions of Tables 2 and 3. 4.1.10
4.1.11.X-ray and ultrasonic inspection of weld quality shall be carried out in accordance with the relevant provisions of GB3323, JB1152 and JB3144. Table 1 Preheating temperature before welding of common thick steel plates
Defect name
Weld bump (①)
Overflow (③)
Weld and heat blast
Carbon steel
15MnCa
15MnTi
Weld quality appearance inspection standard
Preheating temperature
100~120
100~150
Continuous undercut length ≤10% of the total weld length and ≤100 Cumulative undercut length ≤10% of the total weld length
?③Not allowed
Not allowed
Defect name|| tt||Slag inclusion (①③)
Pit defects (?)
Porosity (non-penetrating)
Overlapping concave weld
Drip weld bump?
Uneven weld width①
Unsmooth transition (①)
Incomplete penetration and concave (②)
Weld excess height (③)
Uneven weld width
SL37-91
Continued Table 2
2322078
Note: ② refers to the defect of single-sided without backing plate
Note: The weld should be 4~5mm wider than the groove,||t t||but not more than 8mm, and the two sides
symmetrical to the center
not allowed
weld type
allowable pore diameter
number of pores per meter of weld
allowable pore spacing
not allowed
not allowed
not allowed
L≤25
see Table 3
≤100
defect name
weld bead of fillet weld
fillet weld
weld chain quality grade
SL37—91
continued Table 2
note: 4h, Only for submerged arc welding and gas electric welding
With fillet welding
>6~12±
T-joints connected by butt welds,
, the two welds should have
rounded transition of the original plate thickness
Table 3 Evaluation criteria for incomplete penetration and concave
Percentage of thickness, %
Incomplete penetration
Limited depth, mm
Percentage of total length of defects in total length of weld, %
4.2 Manufacturing of parts
4.2.1 When the parts are locally heated by flame correction, the heating temperature should be controlled between 700~750℃. The shape and position tolerances of the parts with profiles or welding deformation corrected should comply with the provisions of Table 4. 4.2.2 Unselected steel plate, fan pan flatness (t) Straightness of angle steel, I-beam, fine steel Straightness of angle steel strand Verticality of I-beam, channel steel flange Verticality (4) Distortion of angle steel, I-beam, channel steel Web displacement (4) SL37-91 Table 4 Geometric tolerances of profiles or parts corrected for welding deformation Within 1m: 8>12: t≤1 a>4~12; t≤1.5 8≤4, t≤2
1/1000 of the length
but not greater than 5
and 4≤3
≤2000
≤100
Double plate inclination (4)
Web plate inclination (4)
Stiffener plate distancewww.bzxz.net
Web plate distance
Double plate inclination (4)
Twisted beam (4)
SL:37—91
Continued Table 4
4≤0.003b and <2
H≤50 0
Connection without axial ribs
Connection with axial ribs
a≤1:5
4≤0.003b
When L≤5m
When L>5m
Local temporary convexity of web
Unevenness4
SL37-91
Continued Table 4
Not more than 2 within 1m
4.2.3 The section quality of steel and steel plate parts after cutting shall meet the requirements of Class I in ZBJ59002.3. The dimensional deviation value after cutting shall meet the requirements of the drawing. If the drawing does not specify, it can be in accordance with the provisions of Table 5. Table 5 Dimensional deviation of steel and steel plate parts after cutting Part plate thickness Part basic size
≤1000
>1000～2500
>2500~4000
>10~20
>20~30
4.2.4 For parts processed by planing, the deviation of the dimensions without tolerance shall comply with the provisions of Js14 or js14 of GB1804. .4.2.5 After planing of steel plate parts, the straightness of the edge shall not be greater than 0.5/1000 of the edge length and shall not be greater than 1.5mm. 4.2.6 Bolts, nuts and washers used in various parts of the gate shall be treated with anti-corrosion. 4.3 Parts Manufacturing
.4.3.1 The manufacturing shape deviations of the sill, side rails, side water stop, door, supporting steel beams of the hinge and the guard plates (lining plates) at the top, bottom, front and rear of the gate shall comply with the requirements of Table 6. Table 6 Manufacturing shape deviation of sill, side rail, side water stop, door, support steel beam and gate guard plate
Working surface straightness
Measurement surface straightness
Working surface sector flatness
Component surface unprocessed
1/1500 of component length, and not more than 3.01/1000 of component length, preferably not more than 4.0No more than 1.0 and no more than 2 places within each meterImage
Component surface processed
1/2000 of component length, and not more than 1.01/1000 of component length, and not more than 2.0No more than 0.5 and no more than 2 places within each meter92
Unselected
Steel plate, fan pan plane
Straightness of angle steel, I-beam,
fine steel
Verticality of angle steel strand
Verticality of I-beam, channel steel wing
edge (4)
Angle steel, I-beam,
Twist degree
Web plate displacement (4)
SL37-91
Table 4 Geometric and positional tolerances of profiles or parts corrected for welding deformation
Within 1m:
8>12: t≤1
a>4~12; t≤1.5
8≤4, t≤2
1/1000 of the length
but not greater than 5
and 4≤3
≤2000
≤100
Double plate inclination (4)
Web plate inclination (4)
Stiffener plate distance
Web plate distance
Double plate inclination (4)
Twisted beam (4)
SL:37—91
Continued Table 4
4≤0.003b and <2
H≤50 0
Connection without axial ribs
Connection with axial ribs
a≤1:5
4≤0.003b
When L≤5m
When L>5m
Local temporary convexity of web
Unevenness4
SL37-91
Continued Table 4
Not more than 2 within 1m
4.2.3 The section quality of steel and steel plate parts after cutting shall meet the requirements of Class I in ZBJ59002.3. The dimensional deviation value after cutting shall meet the requirements of the drawing. If the drawing does not specify, it can be in accordance with the provisions of Table 5. Table 5 Dimensional deviation of steel and steel plate parts after cutting Part plate thickness Part basic size
≤1000
>1000～2500
>2500~4000
>10~20
>20~30
4.2.4 For parts processed by planing, the deviation of the dimensions without tolerance shall comply with the provisions of Js14 or js14 of GB1804. .4.2.5 After planing of steel plate parts, the straightness of the edge shall not be greater than 0.5/1000 of the edge length and shall not be greater than 1.5mm. 4.2.6 Bolts, nuts and washers used in various parts of the gate shall be treated with anti-corrosion. 4.3 Parts Manufacturing
.4.3.1 The manufacturing shape deviations of the sill, side rails, side water stop, door, supporting steel beams of the hinge and the guard plates (lining plates) at the top, bottom, front and rear of the gate shall comply with the requirements of Table 6. Table 6 Manufacturing shape deviation of sill, side rail, side water stop, door, support steel beam and gate guard plate
Working surface straightness
Measurement surface straightness
Working surface sector flatness
Component surface unprocessed
1/1500 of component length, and not more than 3.01/1000 of component length, preferably not more than 4.0No more than 1.0 and no more than 2 places within each meterImage
Component surface processed
1/2000 of component length, and not more than 1.01/1000 of component length, and not more than 2.0No more than 0.5 and no more than 2 places within each meter92
Unselected
Steel plate, fan pan plane
Straightness of angle steel, I-beam,
fine steel
Verticality of angle steel strand
Verticality of I-beam, channel steel wing
edge (4)
Angle steel, I-beam,
Twist degree
Web plate displacement (4)
SL37-91
Table 4 Geometric and positional tolerances of profiles or parts corrected for welding deformation
Within 1m:
8>12: t≤1
a>4~12; t≤1.5
8≤4, t≤2
1/1000 of the length
but not greater than 5
and 4≤3
≤2000
≤100
Double plate inclination (4)
Web plate inclination (4)
Stiffener plate distance
Web plate distance
Double plate inclination (4)
Twisted beam (4)
SL:37—91
Continued Table 4
4≤0.003b and <2
H≤50 0
Connection without axial ribs
Connection with axial ribs
a≤1:5
4≤0.003b
When L≤5m
When L>5m
Local temporary convexity of web
Unevenness4
SL37-91
Continued Table 4
Not more than 2 within 1m
4.2.3 The section quality of steel and steel plate parts after cutting shall meet the requirements of Class I in ZBJ59002.3. The dimensional deviation value after cutting shall meet the requirements of the drawing. If the drawing does not specify, it can be in accordance with the provisions of Table 5. Table 5 Dimensional deviation of steel and steel plate parts after cutting Part plate thickness Part basic size
≤1000
>1000～2500
>2500~4000
>10~20
>20~30
4.2.4 For parts processed by planing, the deviation of the dimensions without tolerance shall comply with the provisions of Js14 or js14 of GB1804. .4.2.5 After planing of steel plate parts, the straightness of the edge shall not be greater than 0.5/1000 of the edge length and shall not be greater than 1.5mm. 4.2.6 Bolts, nuts and washers used in various parts of the gate shall be treated with anti-corrosion. 4.3 Parts Manufacturing
.4.3.1 The manufacturing shape deviations of the sill, side rails, side water stop, door, supporting steel beams of the hinge and the guard plates (lining plates) at the top, bottom, front and rear of the gate shall comply with the requirements of Table 6. Table 6 Manufacturing shape deviation of sill, side rail, side water stop, door, support steel beam and gate guard plate
Working surface straightness
Measurement surface straightness
Working surface sector flatness
Component surface unprocessed
1/1500 of component length, and not more than 3.01/1000 of component length, preferably not more than 4.0No more than 1.0 and no more than 2 places within each meterImage
Component surface processed
1/2000 of component length, and not more than 1.01/1000 of component length, and not more than 2.0No more than 0.5 and no more than 2 places within each meter9
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.