GOST 16038-80

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  ГОСТ 16038-80

GOST 16038−80 welding arc. Welded joints in pipelines of copper and copper-Nickel alloy. Main types, design elements and dimensions (with Change No. 1)

GOST 16038−80

Group В05

INTERSTATE STANDARD

WELDING ARC. WELDED CONNECTIONS OF PIPELINES
COPPER AND COPPER-NICKEL ALLOY

Main types, design elements and dimensions

Arc welding. Welded joints in pipelines of copper and copper-nickel alloy.
Main types, design elements and dimensions

OKP 0602000000

Date of introduction 1981−07−01

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 24.04.80 N 1877

2. REPLACE GOST 16038−70

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 492−73	1
GOST 859−78	1
GOST 2789−73	9
GOST 15527−70	1
GOST 16130−90	6
GOST 18175−78	1

4. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

5. REPRINT (may 1999) Change N 1, approved in December 1990 (IUS 3−91)

1. This standard establishes the basic types, design elements and dimensions welded joints of pipes with pipes of copper grades M1r, M2r, M3r GOST 859 and copper-Nickel alloy brand mnzh 5−1 according to GOST 492 with the flanges brass brand L90 GOST 15527 and the fittings and nipples in bronze brands, Brams 9−2 according to GOST 18175, or Brainmc 9−4-4−1.

The standard does not apply to welded joints used for making pipes themselves from sheet or strip material.

The requirements of this standard are mandatory.

2. In the standard the following notation methods of arc welding:

SN — in shielding gas consumable electrode;

ZN — in shielding gas consumable electrode;

ZN/SN — shielding gas combination, in which the first pass is applied ZN for subsequent RFP;

R — manual.

For structural elements of pipes, valves and welded joints the following notation:

 — the wall thickness of the pipe;

 — the wall thickness of the welded parts;

 — the thickness of the backing ring;

 — the width of the backing ring;

the gap between the edges of the welded parts after tacking;

-the outer diameter of the pipe;

 — nominal diameter of the pipe;

 — nominal diameter of the welded parts;

 — outer diameter of tapping fittings and PrimaryKey;

 — diameter of distribution pipes;

 — overlap width;

 — the length of the coupling;

the convexity of the weld;

the convexity of the weld from the cavity of the pipe with one-sided welding;

 — the width of the seam;

the concavity of the weld root;

 — chamfer flange;

 — leg fillet weld;

 — leg fillet weld in from the connector side of the flange;

— the thickness of the seam.

3. Main types of welded joints shall be as specified in table.1.

Table 1

Connection type	Form training set of edges	The nature of the weld	The cross-sectional shape		Material cook — transmitted details	Wall thickness and minimum outside diameter of pipe, mm, for welding methods					Conditi — ing the designation of a compound
prepared edges	weld	SN	ZN		ZN/SN	R
Butt the connection pipe with pipe or fittings	Bevel	One-way- tions			Copper	1.0 to 1.5 ---------- 14		S2
Copper- Nickel alloy	-	1.0 to 1.5 ----------- 6		-
	One-way- tions on removable lining			Copper	2,5−3,0 ----------- 45	2.0 to 3.0 ---------- 14		2,0−4,0 ---------- 45
Copper- Nickel alloy	2,0−5,0 ---------- 45	2,0−5,0 --------- 14		-	2,0−5,0 ---------- 45	C4
One-way- tions to the remaining cylindrical lining			Copper	2,5−3,0 ---------- 45	2.0 to 3.0 ---------- 45		2,0−4,0 ---------- 45
Copper- Nickel alloy	2,0−5,0 ----------- 45			2,0−5,0 --------- 45	C5
The beveled edges	One-way- tions			Copper, copper- Nickel alloy	-		1,5−10,0 ------------ 14	4,0−10,0 ---------- 45	-	C17
One-way- tions on removable lining	Copper	4,0−10,0 ------------ 45		3,0−5,0 --------- 14	4,0−10,0 ----------- 45	4,0−5,0 --------- 45	S18
		Copper- Nickel alloy	4,0−15,0 ------------- 45		3,0−10,0 ----------- 14
Copper or copper- Nickel alloy with bronze	-		2,0−6,0 ---------- 14	-	-
Butt the connection pipe with pipe or fittings	The beveled edges	One-way- tions to the remaining cylindrical lining			Copper	4,0−10,0 ------------ 45		3,0−5,0 ---------- 45	4,0−10,0 ----------- 45	4,0−5,0 -------- 45	C19
	Copper- Nickel alloy	4,0−15,0 ------------ 45		3,0−10,0 ---------- 45	4,0−15,0 ----------- 45
With Rivoli — nanim bevel edges	One-way- tions			Copper, copper- Nickel alloy	-		3,0−10,0 ---------- 22	4,0−10,0 ----------- 45	-	С47
Bevel with the distribution	One-way- tions to the remaining cylindrical lining			Copper	2,5−3,0 --------- 45		2.0 to 3.0 --------- 14	-	2,5−4,0 --------- 45	With57
Copper- Nickel alloy	2,0−5,0 --------- 45		2,0−5,0 --------- 14	2,0−5,0 --------- 45
With bevel and the distribution of the edges	One-way- tions to the remaining cylindrical lining			Copper	4,0−15,0 --------- 45		3,0−5,0 --------- 14	4,0−15,0 --------- 45	4,0−5,0 --------- 45	С58
Copper- Nickel alloy	3,0−10,0 --------- 20
One-way- tions for the remainder of the conical lining			Copper, copper- Nickel alloy	4,0−10,0 --------- 45		2,0−5,0 --------- 9	4,0−10,0 --------- 45	-	С51
Splice sectors of elbows (bends)	One-way- tions			Copper, copper- Nickel alloy	-		1,5−3,0 --------- any	-	-	С59
Bevel	One-way- her removable lining			Copper, copper- Nickel alloy	2,0−5,0 --------- 45		2.0 to 3.0 --------- any	-	2,0−5,0 --------- 45	C60
	Bilateral			Copper, copper- Nickel alloy	4,0−15,0 --------- 108		4,0−5,0 --------- 108	4,0−15,0 --------- 108	-	С54
The beveled edges	One-way- tions on removable lining			Copper, copper- Nickel alloy	3,0−5,0 --------- any	С55
One-way- tions for the remainder of the lining			Copper, copper- Nickel alloy	4,0−15,0 --------- 45		2,5−5,0 --------- any	8,0−15,0 --------- 80	-	C61
Lap-connection of pipes with the distribution of one end of the pipe	One-way- tions			Copper, copper- Nickel alloy	2,5−15,0 --------- 45		1,0−5,0 --------- 6	-	2,5−5,0 --------- 45	H3
Lap-connection of pipes with coupling	Bevel	One-way- tions double			Copper, copper- Nickel alloy	2,5−15,0 --------- 45		1,0−5,0 --------- 6	-	2,5−5,0 --------- 45	H4
Lap connection intermediate the fitting or nipple with a pipe	One-way- tions			Copper or copper- Nickel alloy with bronze	2,0−4,0 --------- 24		1,5−4,0 --------- 6	-	-	H1
Gusset flange or ring tube	The beveled edges	One-way- tions			Copper or copper- Nickel alloy brass	2,0−15,0 --------- 24		2,0−5,0 --------- 24	2,0−5,0 --------- 45	У22
	With bevel			-	У23
The beveled edges	With tions			Copper or copper- Nickel alloy brass	2,0−15,0 --------- 90		U7
		Copper or copper- Nickel alloy brass	6,0−15,0 --------- 32		-	-	У24
The gusset of the Appendix, derivation of the fitting or prevarila with the pipe when the ratio not more than 0.6	Bevel	One-way- tions			Copper, copper- Nickel alloy	2,5−5,0 --------- 24		1,0−5,0 --------- 9	-	2,0−5,0 --------- 38	У17
			Copper or copper- Nickel alloy with bronze	2,5−15,0 -------------- at least 20		1,5−5,0 ------------- at least 12	2,5−5,0 --------- at least 20
The gusset of the Appendix, derivation of the fitting or prevarila with the pipe when the ratio not more than 0.6	Bevel			Copper, copper- Nickel alloy	2,5−5,0 --------- 55		1,0−5,0 --------- 9	-	2,5−5,0 --------- 38	У18
	One-way- tions			Copper or copper- Nickel alloy with bronze	2,5−15,0 -------------- at least 20		1,5 5,0 -------------- at least 12	2,5−5,0 ----------- at least 20
With bevel			Copper, copper- Nickel alloy	6,0−15,0 --------- 55		-	6,0−15,0 --------- 55	-	У19
Angular connection of the Appendix with a tube of equal dimensions	Bevel			Copper	2,5−4,0 --------- 105			-	2,5−4,0 --------- 105	У16

Notes:

1. In the column «wall Thickness and minimum outside diameter of the pipe for welding methods» are given in the numerator of the limiting thickness of the pipe wall, with the exception of the connection processes, for which the thickness of the walls of the apophysis in the denominator of the minimum outer diameters of the pipes with the exception of the connection processes, junction fittings and PrimaryKey, which given their minimal diameters.

2. The values for the maximum thickness and minimum outside diameters for copper pipe are given in GOST 617 for copper-Nickel pipes — GOST 17217.

1−3. (Changed edition, Rev. N 1).

4. Structural elements and their dimensions shall be as specified in table.2−27.

For fillet welds the table below shows the calculated leg.

Table 2

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts
S2			ZN	Copper, copper- Nickel alloy	1.0 to 1.5

Table 3

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		+1	±1	+1,0 -0,5
ZN	Copper
SN; ZN; P	Copper — Nickel alloy	2,0	0	4
SN	Copper, copper — Nickel alloy	2,5−3,0	1	7	1,0
C4			ZN	5
R	7
Copper	3,5−4,0	9
SN	2	1,5
ZN	Copper — Nickel alloy	3,5−5,0	5
R	9

Note. At thickness more than 3 mm of welded connection is used in those cases where the root of the weld lack of fusion is allowed.

Table 4

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		(PREV. off. +1)	(PREV. off. ±1)	(PREV. off. +1,0 -0,5)
ZN	Copper
SN; P	Copper — Nickel alloy	2,0	0	5
SN	Copper, copper — Nickel alloy	8	1,0
C5			ZN	2,5−3,0	2	6
8
R	Copper	3,5−4,0	10
SN
ZN	Copper — Nickel alloy	3,5−5,0	3	6	1,5
R	10

Note. At thickness more than 3 mm of welded connection is used in those cases where the root of the weld lack of fusion is allowed.

Table 5

Dimensions, mm

Structural elements
Conditi — ing the designation of welded joints	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		But — min.	Pred. off.	But — min.	Pred. off.	But — min.	Pred. off.	No more
ZN	1,5−2,5	+0,3	4	+2	1,0	+1,0	1,0	0,5
-1	-0,5
2,5−3,5	6
4.0 to 4.5	+0,5	7	1,5
5,0−5,5	8	0,8
С77			ZN/SN; ZN	Copper, copper- Nickel alloy	6,0	0	9
	7,0−7,5	10	+2	1,5	±0,5
8,0	+1,0	11	2,0	1,0
10,0	14

Table 6

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		But — min.	Pred. off.	But — min.	Pred. off.	But — min.	Pred. off.
ZN	3,0−3,5	1	7	+2
SN; ZN/SN	Copper, copper- Nickel alloy	2	+4	1,5
ZN	4,0−5,0	1	9	+2
R	2	+4
SN; ZN/SN	Copper, copper- Nickel alloy	5,5−7,5	3	+1,0	12	+3	2,0	±1,0
S18			ZN	2	11	+2	1,5
SN; ZN/SN	Copper, copper- Nickel alloy	8,0−10,0	3	17	+3
ZN	2	13	+4	3,0
SN	15,0	3	23	+3
ZN	Copper, copper- Nickel alloy with bronze	2,0−4,5	0	+0,3	6	+2	1,0	±0,5
5,0−6,0	8

Table 7

Dimensions, mm

Structural elements						±1
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		But — min.	Pred. off.	But — min.	Pred. off.
ZN	Copper, copper- Nickel alloy	3,0−3,5	1	7	+2
SN; ZN/SN; P	4,0−5,0	2	+1	1,5
Ten	+4
SN; ZN/SN	3	+2	12	2,0
C19			Copper	5,5−7,5
ZN	Copper — Nickel alloy	2	+1	11	+2	1,5
SN; ZN/SN	Copper
8,0−10,0	+2	17	+4
ZN	Copper- Nickel alloy	3	+1	14	3,0
SN; ZN/SN	15,0	+2	23	+5

Table 8

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		(PREV. off. ±2)	(pre off. +0,5)	no more
ZN	3,0−3,5	6	1,0
4.0 to 4.5	8	1,5	0,4
С47			Copper, copper- Nickel alloy	5,0−5,5	9
ZN; ZN/SN	6,0−7,5	11	2,0	0,8
8,0−10,0	15	3,0

Table 9

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		+1	±1	+1,0 -0,5
ZN	Copper
SN; P	Copper- Nickel alloy	2,0	0	5
With57			SN	Copper, copper- Nickel alloy	8	1,0
ZN	2,5−3,0	2	6
R	8
Copper	3,5−4,0	10
_________ * Size for reference.	SN	Copper- Nickel alloy	3	1,5
ZN	3,5−5,0	6
R	10

Note. At thickness more than 3 mm of welded connection is used in those cases where the root of the weld lack of fusion is allowed.

Table 10

Dimensions, mm

Structural elements						±1
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		But — min.	Pred. off.	But — min.	Pred. off.
ZN	Copper	3,0−3,5	1	7	+2
SN; ZN/SN; P	Copper- Nickel alloy	4,0−5,0	2	+1	1,5
10
SN; ZN/SN	Copper	+3
С58			Copper- Nickel alloy	5,5−7,5	12
ZN
SN; ZN/SN	Copper	3	+2	2,0
Copper- Nickel alloy	8,0−10,0	17	+4
ZN
________ * Size for reference.	SN; ZN/SN	Copper, copper- Nickel alloy	15,0	23	+5	3,0

Table 11

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		(PREV. off. ±0,5)			But — min.	Pred. off.	+1,0 -1,5
ZN	2,0	2	2,0	20
2,5	2,5	21	6	+2	1,0
3,0−3,5	3,0	22
С51			SN; ZN/SN; ZN	Copper, copper- Nickel alloy	4,0−5,0	9
5,5−7,5	3	5,0	25	12	+3	1,5
______ * Size for reference.	SN; ZN/SN	8,0	14
10,0	16

Table 12

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	Material welded parts
С59			ZN	Copper, copper- Nickel alloy	1,5−3,0

Note. Allowed to execute double-sided seam.

Table 13

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		+1	±1
SN	7
C60			ZN	Copper, copper- Nickel alloy	2.0 to 3.0	1	6
		R	7
SN; P	3,5−5,0	2	9

Note. At thickness more than 3 mm of welded connection is used in those cases where the root of the weld lack of fusion is allowed.

Table 14

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		+4	Ho- min.	Pred. off.
ZN	4,0−5,0	8
2	±0,5
54			ZN/SN; SN	Copper, copper- Nickel alloy	5,5−7,5	10
8,0−10,0	12	3	±1,0
15,0	18	4

Note. Instead of double sided seam can be done one-sided, with the full penetration weld root.

Table 15

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details		+1	But — min.	Pred. off.	But — min.	Pred. off.
ZN	3,0−3,5	1	7	+2
2	±0,5
С55			4,0−5,0	2	9	+3
		SN	Copper, copper- Nickel alloy	5,5−7,5	12
8,0−10,0	3	17	+4	3	±1,0
SN; ZN/SN	15,0	23	4

Table 16

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	SPO — sob swar — Ki	The material is boil — it brings details		But — min.	Pred. off.	But — min.	Pred. off.	But — min.	Pred. off.
ZN	2,5−3,0	1	7	+2
2	+1	10	2	+0,5
4,0−5,0
C61			SN	Copper, copper- Nickel alloy	5,5−7,5	12	+4
		SN; ZN/SN	8,0−10,0	3	+2	17	3	±1,0
15,0	23	+5	4

Table 17

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details			(PREV. off. ±5)
ZN	1,0−2,5	30 (withup to 32 incl.)
H3			SN; ZN; R	Copper, copper- Nickel alloy	2,5−5,0		40 (ifmore than 32 to 108 incl.)
SN	5,5−15,0	50 (inexcess of 108)

Table 18

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details			(PREV. off. ±5)
ZN	1,0−3,0	40 (subjectto 32 incl.)
H4			SN; ZN; R	Copper, copper- Nickel alloy	2,5−5,0		50 (ifmore than 32 to 108 incl.)
SN	5,5−15,0	60 (inexcess of 108)

Table 19

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material is boil — it brings details			+2
ZN	1,5−4,0	6−22
H1			SN; ZN	Copper or copper- Nickel alloy with bronze	2,0−4,0	24−38	The thickness of the finer detail

Note. Allowed the use of fittings and nipples with chamfers.

Table 20

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		, no more
SN; ZN; P	Copper, copper- Nickel alloy brass	2−5	0.5 (when up to 100 incl.)	1,3
У22			SN	5−10	1,0 (if over 100)	-2
15	14

Note. The pipe should be flared on the chamfer of the flange.

Table 21

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		, no more
SN; ZN; P	2,0−5,0	0.5 (when up to 100 incl.)	1,3
У23			Copper or copper- Nickel alloy brass	5,0−10,0	1,0 (if over 100)	-2
SN	15,0	14

Notes:

1. The pipe should be flared to eliminate looseness.

2. Connection is recommended for pipelines transporting corrosive environment prone to struevoy corrosion.

Table 22

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	Material cook transmitted details		, no more
SN; ZN; R	2,0−5,0	0.5 (when up to 100 incl.)	1,3
U7			Copper or copper- Nickel alloy with brass	For 5.0−7.5	1,0 (if over 100)	-1	-2
SN	8,0−15,0	10

Table 23

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		, no more
SN	Copper or copper- Nickel alloy with brass	6,0−7,5	0.5 (when up to 100 incl.)	1,3	-2
У24			8,0−15,0	1,0 (if over 100)	10

Notes:

1. Connection is recommended for pipelines transporting corrosive working environment prone to struevoy corrosion.

2. The seam with the mating side of the flange is allowed to perform the welding process ZN.

Table 24

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		, not less than	, no more
ZN	Copper, copper- Nickel alloy	1,0−2,0	-	1,0
У17			SN; ZN; P	2,5−5,0
		ZN	Copper or copper- Nickel alloy with bronze	-	12	0,5	1.3 thickness of the finer detail
SN; ZN; R	20

Table 25

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		, not less than	, no more
ZN	Copper, copper- Nickel alloy	1,0−2,0
SN; ZN; R	2,5−5,0	-	1,0
У18			ZN	Copper or copper- Nickel alloy with bronze	12	1.3 thickness of the finer detail
		SN; ZN; R	-	20	0,5

Table 26

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		But — min.	Pred. off.	But — min.	Pred. off.
6,0−7,0	17	+2
У19			SN; ZN/SN	Copper, copper- Nickel alloy	7,5−10,0	20	2	+2 -0,5
		15,0	28	+3	3	3.0 a -0,5

Note. Allowed incomplete fusion and excess poplava value not more than 1.5 mm with a total length of up to 20% of the perimeter of the weld.

Table 27

Dimensions, mm

Structural elements
Designation of a welded joint	prepared edges of the welded parts	weld	Welding method	The material of the welded parts		+2	+1
У16			2,5−3,0	4	3
		SN; ZN; P	Copper	3,5−4,0	6	4

5. In the manufacture tees and crosses made of pipes shall apply to the types of welded joints established for processes with pipes, and welding of tees, crosses and transitions to pipes or flanges, respectively, the types of welded joints of pipes with pipes or tubes with flanges.

6. For welds performed with welding materials according to GOST 16130, the notional pressure allowed is equal to the nominal size of the pressure established for the pipe, except when butt joints lack of fusion.

7. The offset before welding of the edges of butt joints of pipes welded on the weight allowed up to 20% of pipe wall thickness, but not more than 0.3 mm on the inner surface.

When welding on the remaining or removable linings, or when double-sided welding, the displacement of edges is allowed up to 1 mm.

8. Welding butt joints of parts of unequal thickness if the difference is not exceeding the values specified in table.28, should be made as well as parts of the same thickness; the structural elements of prepared edges and weld sizes should choose a large thickness.

Table 28

mm

The thickness of the thin parts	The difference between the thickness of the parts
To 2.5	0,5
SV. 2.5 to 4.0	1,0
SV. 4,0	2,0

To implement a smooth transition from one part to another inclined position of the surface suture (Fig.1).

Damn.1

Damn.1

When the difference of the thickness of the welded parts more than the values specified in table.28, parts that have a greater thickness , should be made with the bevel to the thickness of thin parts , as indicated on the devil.2 and 3. While the structural elements of prepared edges and weld sizes should choose smaller thickness.

Damn.2

Damn.2

Damn.3

Damn.3

9. The roughness of the machined weld surfaces — not more than 80 µm churchyard 2789.

10. The remaining lining and clutch is made of metal of the same brand that made the pipe.

11. The remaining gap between lining and pipe for welded joints that are controlled radiographic method, should be not more than 0.2 mm, and for compounds that are not controlled by the radiographic method, is not more than 0.5 mm.

Local clearances for these compounds are allowed up to 0.5 mm and 1.0 mm, respectively.

12. Diameter of distribution pipes should be determined according to the formula:

13. In welded connections of processes with pipes allowed connection of the prongs at an angle of 45° to the axis of the pipe.

14. In the compounds У18 and У19 sizes «» and «» in section a-A must be installed in the design. In this case, the size of the «» must overlap the wall thinning of the pipe formed by cutting out openings on up to 3 mm, and the size «» should be not less than the minimum wall thickness of the welded parts.

15. Maximum deviations of each fillet weld of nominal in cases not covered in the tables should match:

+2 mm when 5 mm;

+3 mm — 5 mmand 12 mm;

+5 mm — at 12 mm.

16. Allowed convexity fillet weld is not greater than 2 mm when welding in the bottom position and up to 3 mm when welding in different spatial positions. Concave fillet weld up to 30% of his leg, but not more than 3 mm.

(Changed edition, Rev. N 1).