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.

• Diameter. The diameter of butt weld reducer can be 1/2 NPS to 80 NPS ( DN15-DN2000 ).
• Thickness. The schedule range of pipe reducer is Sch 10S to Sch XXS.

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