SY/T 5270-2000 Technical regulations for the design of high-pressure water injection pipeline accessories
Some standard content:
rCs 75.180.9 No.: 23.40
Accumulative No.: B185——2001
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5270—2000
Technical rcgulation of design for high pressure waler injection fittings2000)-12-25 Issued
State Petroleum and Chemical Industry Bureau
21-06-01 Implementation
SY/T 5270—2000
2 Reference standard
3 Materials
4 Strength design
5 Nondestructive testing and examination
Appendix (Appendix to the standard)
Appendix ((Appendix to the standard)
Appendix D (Appendix to the suggestion)
Mechanical properties of steel for commercial pressure water replacement
Chemical composition of pins for high-pressure injection pipe fittings
Flat head structure coefficient K to be considered.||t t||Allowable stress of steel for high-pressure water injection pipe fittings
SY/5270—20HH0
This standard is a revision of 5Y/F'527U91 "Technical regulations for the design of high-pressure water injection pipe fittings". The main contents of this revision are as follows:
1. According to the format of the first unit of the standard drafting and table construction rules of the G book T1.1-1993 "Guidelines for Standardization Work", Part 1: Basic requirements for standard writing: 2. Add a preface and cancel additional instructions:|| tt||3. Change the applicable scope:
4. Adjust the materials used for high-pressure water injection pipeline accessories; 5. Add two types of flat head structure;
6. Clarify the standards that non-destructive testing should meet. This standard shall be effective from the date of entry into force and shall be in line with SY/T5270-91. Appendix A, Appendix B and Appendix C of this standard are appendices to the standard, and the appendix of this standard is a reminder appendix. This standard is proposed by China National Petroleum Corporation. This standard is issued by the Planning Institute of China National Petroleum Corporation. The starting unit of this standard: Planning Institute of China National Petroleum Corporation, Jiangshuang Petroleum Administration Bureau Exploration and Design Institute. The main drafters of this standard are Zhang Honglin, Wu Lvchen, Shi Jin, Baocan, and Xiaolin. This standard was first issued in July 1991, and this is the first revision: This standard is entrusted to the Planning Institute of China National Petroleum Corporation to interpret 1 Scope
China National Petroleum Corporation Natural Gas Industry Standard High-pressure Water Injection Pipe Fittings Design Technical Regulations
T'echnlcal SY/T 5270-2MM
Recommendation SY/T5270-91
This standard specifies the materials, strength design, non-cabinet inspection and pressure test requirements for elbows, tees, reducers, pipe heads and other fittings for oil and gas high pressure water.
This standard is applicable to general fittings for water with a design pressure of 1035MF%, a nominal diameter of 10-30mm, and a design temperature of 4-100C.
2 Reference standards
The provisions contained in the following standards will be used as provisions of this standard when they are mentioned in this standard. When this standard is published, the versions shown are all valid. All standards are publicly revised. The parties using this standard should explore the possibility of using the latest version of the following standards: GB150-1998 Manufacturing of accounting containers
H53115 High pressure exhaustion without avoiding steel
CB6470-1986 Commercial pressure chainless steel belt for fertilizer equipment JB4726-44 Carbon steel and low alloy steel sensitive parts for pressure vessels B473-94 Pressure wear test
Technical supervision case regulations for pressure vessels issued by the Quality and Technical Supervision Bureau in 1999 No. 154 3 Materials ||tt| |-Stock regulations
3.1.1 The steel materials used for constant pressure water injection pipe fittings shall meet the relevant regulations of this standard. 3.1.2 The key to selecting commercial pressure water injection pipe fittings shall be to consider the use efficiency of the pipe fittings (such as design pressure, design temperature, individual characteristics, etc.), the welding performance of the material, the manufacturing process and economic rationality. 3.1.3 The steel materials used for constant pressure water injection pipe fittings shall be smelted in open-hearth furnace, electric furnace or gas-carrying converter, and the technical requirements of the steel materials shall not be in accordance with the relevant national standards, industry standards or relevant technical conditions. 3.1.4 The steel materials for high pressure water injection single pieces shall be accompanied by steel The steel production unit shall provide the steel product quality certificate, and the pipe fittings manufacturing unit shall accept the steel product and conduct re-inspection if necessary. If there is no steel product quality certificate issued by the steel production unit, the relevant provisions of the current safety technical supervision process of the joint pressure device 3 shall be issued:
3..5 The carbon content of steel used for water injection pipe fittings shall not exceed 10.25%, 3.1, 1.25%; When there are special requirements or requirements for flash materials (such as special smelting methods, higher commercial impact index, higher inspection requirements, increased mechanical properties inspection rate, etc.), the design unit shall provide the corresponding loss in the sample. 3.1.7 Steels with chemical compositions similar to or higher than those listed in this standard (such as new materials or foreign materials) are allowed to be used, but necessary mechanical and process performance tests must be carried out before use, and the performance should not be lower than that of the previous generation. 3.2 Allowable composition
3.2.1 The allowable stress values of the materials used in this standard are based on Table 1. Approved by the Beijing Petroleum and Chemical Industry Bureau on December 25, 2000 and implemented on June 1, 2001
Standard system, voice gold example
SY/T S270—20H
Table 1 Selection of allowable stress for steel
Allowable stress (take the smaller of the following values) M'a
Material standard anti-cracking strength value, MP
.--Standard application point of steel, Ma:
Micro-susceptibility point under micro-sustainability
, the average value of the endurance of a sample material in a batch with a yield rate of ?10×101, MFa;
% standard material under a range of 10[0+1% deformation limit, MT
3.2.2 Detailed application of steel can be directly based on ( 315)-1998 Chapter 4 selection, the allowable stress of steel and winding parts can also refer to the appendix of the resistance record [(catch! Selection.
3.2,3 When the design temperature is lower than 20, take the allowable stress at 20. 3.3 Steel times
3.3.1 The short steel pipe used for manufacturing high pressure water injection pipe fittings shall comply with the provisions of G No. 6479 or G No. 5310. 1.3.2 The performance of the semi-finished steel pipe shall comply with the provisions of A1 or A2 in Appendix A (Appendix of the standard). 3.3.3 The chemical composition of the non-refined fine pipe shall comply with the provisions of Table B1 or Table 2 in Appendix B (Appendix of the standard). 3.4 Parts
3.4.1 The steel for two-pressure water injection pipe shall comply with the provisions of 1B4726. 3.4.2 The grade of the forging shall be indicated on the design drawing. The forgings of commercial water pipe fittings shall be the forgings of the number or grade specified in J472-4. 3.4.3 The mechanical properties of the forgings shall comply with the provisions of Table 3 in Appendix A (Appendix to the standard). 3.4.4 The chemical composition of the forgings shall comply with the provisions of Table B3 in Appendix B (Appendix to the standard). 4 Strength design 4.1 The additional formula (1) is: C Ci - C2
一—Negative deviation of steel strip or steel plate, mm—Specific tolerance, mmz
4.1.1 Negative deviation of steel strip or steel strip
Negative deviation of steel strip or steel plate C. Select according to the corresponding steel pipe or steel plate standard. When the negative deviation of the material thickness is not more than 0.25mm and does not exceed 6% of the specified thickness (i.e. the thickness marked on the drawing), the negative deviation can be ignored. 4.1.2 The corrosion allowance of chrome-plated pipe fittings shall be determined by the designer based on the corrosion rate of the two metal materials and the performance of the pipe, but shall not be less than 4.2 Wall thickness of pipe ends, pipe ends, short sections and pressure fittings 4.2.1 Calculation of pipe ends according to formula (2): Formula: - Calculated wall thickness of pipe fittings, :
- design pressure, Ma:
D).一 Pipe fitting outer diameter, m;
SY/T 5270—2000
[a}'——Permissible stress of general fitting material at design temperature, MPa: Welding seam coefficient, for keyless welds, take 1.0:
Formula (2) Applicable range: D1.7. Where D is the inner diameter of the pipe fitting, 4.2.2 Minimum wall thickness
Minimum wall thickness is calculated as shown in formula (3):
Minimum,
Northern letters mean forward,
4.2.3. Wall thickness
The wall thickness of the pipe fittings should not be less than the thickness determined by the following formula (3). 4.3 Wall thickness
4.3.1 Calculation of the thickness of the main pipe
See formula (4):
Calculation of the main wall thickness, mm:
In the formula: 6—
D, - the outer diameter of the main pipe, mra;
Salinity reduction coefficient, according to Table 2.
The meanings of the remaining letters are the same as before.
Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 Old 2 Welding strength reduction coefficient
Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are still the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*3.3.1 Thickness of three-pass welding pipes (mm): Calculate the thickness of the main pipe according to formula (4): Calculate the thickness of the main pipe, mm: Where: 6-D, mra; Salinity reduction coefficient, according to Table 2. The meanings of the remaining letters are the same as before. Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 2 Welding strength coefficient Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*3.3.1 Thickness of three-pass welding pipes (mm): Calculate the thickness of the main pipe according to formula (4): Calculate the thickness of the main pipe, mm: Where: 6-D, mra; Salinity reduction coefficient, according to Table 2. The meanings of the remaining letters are the same as before. Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 2 Welding strength coefficient Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1www.bzxz.net
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are still the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*1. The thickness of the main pipe is calculated by formula (4):
Main calculation wall, mm:
Where: 6—
D,-the outer diameter of the main pipe, mm;
Salt reduction coefficient, according to Table 2.
The meaning of other letters is the same as before.
Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 Old 2 Welding one-pass strength weakness coefficient
Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are still the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*1. The thickness of the main pipe is calculated by formula (4):
Main calculation wall, mm:
Where: 6—
D,-the outer diameter of the main pipe, mm;
Salt reduction coefficient, according to Table 2.
The meaning of other letters is the same as before.
Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 Old 2 Welding one-pass strength weakness coefficient
Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are still the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*-One main outer diameter, mra;
salinity reduction coefficient, according to Table 2.
The meanings of the other letters are the same as before.
Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 Old 2 welding one-pass strength sense weakness coefficient
Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are still the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the inner diameter of the round tank, mn equal to 2, L is the total length of the reducer (not including the straight length), as shown in Figure 3, mm: reducer technology head chain end of the large end of the return radius, r1 greater than the ton equal to 0.01D1, mm; DI - reducer large end inner diameter, IW;
. - reducer chain half top negative, as shown in Figure 3. Formula (30), formula (31) is applicable to 30*-One main outer diameter, mra;
salinity reduction coefficient, according to Table 2.
The meanings of the other letters are the same as before.
Formula (4) Applicable model: D660mm, 4z/120.5, 1.058=D/1.5 Old 2 welding one-pass strength sense weakness coefficient
Frequent inspection group press!
Potential change is above
1.05.01.1
Method: d, t is the shadow, the inner diameter of the branch, nm is the strong type
Butterfly type factor 1 (h)
Spiral type [see Figure 1(6]
Single brain [see Figure (a]?
1.20(1 +X r2
X- dDda)
According to formula (5) ---formula (11) calculation
In the formula: d
(s) Single basis: strong
SY/T 5270—20H0
(h) Actual girl
Figure 1 The three-follow-up method, the strong type at
ay = a
dA - (Da +/2
D, - (D +t)2
Average diameter of branch pipe, mm:
-Average diameter of branch pipe, mm:
3,-Effective thickness of main pipe, mm;
,-Effective thickness of branch pipe, mm:
8--Main wall thickness,
a2--Branch wall thickness, mm;
Outer diameter of a branch pipe, mm.
The rest of the letters have the same meaning as before.
is the calculation formula of the main wall thickness (12) = a+c
In the formula,
--Minimum thickness of main pipe, mmn
The rest of the letters have the same meaning as before.
) The calculation of the minimum thickness of branch pipe is shown in formula (3): 8j - (D/D,)
Where: ..
Minimum thickness of branch pipe, mm
The rest of the letters have the same meaning as before.
d) Nominal sequence. The wall thickness of the welding tee shall not be less than the wall thickness determined by formula (12) and formula (13). e) The material of the reinforcing element is the same as that of the welding tee main pipe, and its structural dimensions meet the requirements of Table 3. [
Additional type
Note: The symbols in the table are shown in Figure 1
4.3.2 Hot-pressed tee thickness
Main pipe calculation wall see formula (14):
SY/T 5270---20M
Table 3 Dimensions of reinforcing elements Water
Additional elements as much as possible
5*±20
, #-68
Formula: 8
Hot-pressed tee wall thickness, mmt
Required, —-Hot-pressed strength or period coefficient, according to formula (15) or (16) to obtain the value. The meaning of the letters is as follows.
The calculation of the magnetic weakness coefficient of the transition heat-resistant tee is shown in formula (15): dl = diA,2yA,≤ 1
Where: 02
The effective case of hot pressing tee, mmi
85: h120
(15)
The pressure-bearing area of the vehicle within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, as shown in Figure 2:
The pressure-bearing area within the maximum load-bearing length range on the longitudinal section passing through the center line of the main support, mm, as shown in Figure 2.
英余宁母 has the same meaning as before,
Main center information
（）Circle through the defense structure
Figure 2 Schematic diagram of hot-pressed tee wall thickness calculation network
Main center both
[1h] Straight distance structure
The calculation of the strength sensitivity coefficient of the hot-pressed tee at right angles is shown in formula (16) to formula (18): 0.9(te -8x +le:Ba/A)
pa-1ataytiasuodpdaz
ta = Vdr + oaje
In the formula: -
SY/T 5270-2000
Ir.t = V(d2 +a8
A branch pipe effective wall sequence of hot-pressed tee, mnIGa trr-
are the maximum bearing lengths of the main and branch of the thermal H tee, respectively, imra. The rest of the meanings are the same as before,
b6) The calculation of the minimum wall float of the main pipe is shown in formula (19): = + c
. The calculation of the minimum wall thickness of the branch is shown in formula (20): djg - (de/di)8m
. The meanings of the letters in the above are the same.
d) Nominal wall thickness, hot pressing =, general name, nominal wall thickness should not be less than the original wall thickness determined by formula (19) and formula [21), A.4 Head thickness
4.4.1 Box tooth head wall thickness
a) Calculation data see formula (21) and formula (22): KiD
8,-2014-0.59
K, = [2+(D)(2H3)31/6
Where: — Calculation thickness of flank head, m
D-: Head inner diameter, mm
K—Shape coefficient of round head For standard elliptical head, take K,-1.． Head inner surface height, mm
The rest of the formulas are the same as before.
6) Minimum thickness calculation see formula (23):
Minimum thickness of circular head, imre
in: on
The meaning of the mother is as before.
c Nominal thickness, the nominal thickness of elliptical head should not be less than the wall thickness determined by formula (23), 4.4.2 Toothed flat head wall thickness calculation sequence see formula (24):
in: total,
P-calculated diameter, mTm: see Appendix C (standard appendix): K-- wrong equal coefficient: see Appendix ((standard appendix) The rest of the meaning is the same as before.
b) Minimum wall thickness calculation see formula (25): m +C
- Minimum thickness of flat head, mma
I+: 8-
The rest of the letters have the same meaning as before,
c) Nominal wall thickness, the nominal thickness of the flat head should not be less than the wall thickness determined by formula (25): 6
·(22)
4.4.3 Hemispherical wall thickness
8) Calculation of wall thickness see formula (26):
In the formula:
Calculation of wall thickness of hemispherical head, nm.
The rest of the letters have the same meaning as before:
6) Calculation of minimum wall thickness see test (27):
SY/T 5270--2000
Ou = ,+ C
In the formula: - Minimum thickness of hemispherical head, mm The rest of the letters in this section have the same meaning as before.
c) Nominal thickness: The nominal thickness of the hemispherical head should not be less than the wall thickness determined by formula (27). 4.5 Wall thickness of reducers
4.5.1 Circular chain-shaped concentric reducers connected by non-circular arcs (wall thickness) calculation method See formula (28):
8g -(2:039 - p)00sa
Where: - wall thickness of reducer, mmn; - inner diameter of reducer core end, mm
- reducer is determined by half of the head,
The meanings of the remaining letters are as follows.
Formula (28) is applicable to the circular reducer with a diameter of ≤30. When c>30, the circular transition outer diameter joint h) is used. The calculation of the minimum diameter is shown in formula (29).
Formula: 8
Minimum thickness of the surface reducer, mmn
The rest of the diameters are shown in the formula.
Nominal wall thickness, the nominal thickness of the conical reducer is not less than that determined by formula (20). 4.5.2 Calculation of the thickness of the circular concentric reducer connected by arc a) Calculate the wall thickness according to formula (30):
8g=(2019-)uea
8n=2aj+++
Dar = I -2(1 - cus)
Wu Zhong: a-
Another diameter joint calculation compensation, the terms (30), (31) the two are equal to the value of the person, mm reducer inner diameter, for the distance from the end (the in
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