How to Calculate Weight of Butt Weld Reducer

Whatever shipping by air or containers, it is necessary and important to do pipe reducer weight calculation for checking the freight. There are two types of butt weld reducer: Concentric and Eccentric Reducer. But they don’t influence the weight calculating . So how can we get their weight? Let’s find the ways.

There are two methods to get the weights:

1. Calculate by formula.
2. Calculate by chart.

Industrial Pipe Reducer Weight Calculation Formula

It this way, We should know some dimensions in mm and then calculate their weight by formula 0.02466 × S ×[ (D+d)/2-S] × H / 1000

• S: Wall thickness of Butt Weld Reducer
• D: Outside diameter of the larger end
• d: Outside diameter of the small end
• H: End to end dimension

Here is an example: A 1”×3/4” Sch40 eccentric butt weld reducer, we can know D=33.4, d=26.7, S=3.4. H=51 from specification, so the weight is 0.02466×3.4×[(33.4+26.7)/2-3.4]×51/1000=0.11kg

Comparing with weight chart, this method can calculate precise weight of each size, even though some special dimensions. But this way would cost more time and may make a mistake since it is complex.

Butt Weld Pipe Reducer Weight Chart

It is easier to get the weight by diameter and thickness in the chart.

Butt Weld Pipe Reducer Weight Chart
DN	NPS	10S	20	STD	40	XS	80	100	120	140	160	XXS
15	1/2	0.05		0.08	0.08	0.1	0.1
20	3/4	0.1		0.17	0.17	0.2	0.2
25	1	0.13		0.21	0.21	0.25	0.25				0.22
32	11/4	02		0.29	0.29	0.35	0.35
40	11/2	0.28		0.42	0.42	0.58	0.58				0.6
50	2	0.45		0.8	0.8	1.03	1.03				1.04
65	21/2	0.55		1.05	1.05	1.42	1.42				1.65
80	3	0.74		1.36	1.36	1.9	1.9
90	31/2	084		1.63	1.63	2.27	2.27				24
100	4	1.38		2.77	2.77	4	3.93				4.4
125	5	1.85		3.96	3.96	6	6				7.14	8.62
150	6	2.8		6.31	6.31	5.95	9.26				10.8	12.6
200	8	4.6	7.85	10.7	10.7	9.26	17.5		15		18.4	17.9
250	10	7	11.2	15.8	16.3	14.5	25.1	21.7	25.1	29.3	32.5	29.3
300	12	14	25.6	28.8	32.1	21	56.5	35.7	41.7	46.3	53.3	41.7
350	14	17.5	30.5	38.5	48.8	37.1	79	73.3	84.5	95.4	106
400	16	21.5	35.2	44.5	64.3	48.8	102	96	112	130.5	143
450	18	36	62.7	62.7	98.5	58.5	165
500	20	38	72.6	72.6		80.4	181
550	22	47.5	97	79.1	142	93.8	226
600	24		130	100		101
650	26		142	110		130
700	28	85	152	119		142
750	30		161	125	208	152
800	32		171	132	231	161
850	34		180	140	262	171
900	36			148		180
950	38			156		194
1000	40			178		203
1050	42			189		235
1100	44			199		244
1150	46			210		257
1200	48			223		269
1300	52			241
1400	56			258
1500	60			1018

Steel Pipe Reducer Dimensions

Standard	ASME B16.9
Diameter	1/2″ NPS – 80″ NPS / DN15 – DN2000
Schedule	Sch 10S,20, STD, 40, XS, Sch80, 100, 120, 140, 160, XXS
Butt Weld Reducer Type	Concentric and Eccentric Reducer, Seamless and Welded Reducer
Stainless Steel	ASTM A403 WP304/304L, WP316/316L, WP321, WP317, WP310
Carbon Steel	A234 WPB, A420 WPL3, WPL6, WPL9, A860 WPHY42/52/60/65/70.
Alloy Steel Butt Weld Reducer	ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91
Duplex Stainless Steel	S 31803, S 32205,S 32550, S 32750, S 32760

Material for Concentric Redcuer ASME B16.9 

Stainless Steel Grades

ASTM A403 WP304/304L/304H, 316/316L, 310S, 317,347,904L

Carbon Steel Grades

ASTM A234 WPB/WPC, ASTM A420 WPL6, ASTM A860 WPHY 42 / 46 / 56 / 60 / 65

Alloy Steel Grades

ASTM A234 WP11 / WP12 / WP 5 / WP9 / WP91 / WP92 / WP 22