Symbol	Description	Unit
$Re$	Reynolds number	—
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s
$D$	Characteristic dimension	m
$\mu$	Dynamic viscosity	Pa·s
$P$	Pressure	Pa
$f$	Darcy friction factor	—

Schedule 40 Steel Pipe Weight Reference

The following table provides typical weights for common Schedule 40 steel pipes, both empty and filled with water.

21 rows

Typical Weight of Schedule 40 Steel Pipe with and without Water
Nominal Pipe Size(in)	Nominal Pipe Size(mm)	Weight of Pipe(lbs/ft)	Weight of Pipe(kg/m)	Weight Filled with Water(lbs/ft)	Weight Filled with Water(kg/m)
3/8	10	0.6	0.9	0.7	1
1/2	15	0.8	1.2	0.9	1.2
3/4	20	1.1	1.7	1.3	2
1	25	1.7	2.5	2.1	3
1 1/4	32	2.3	3.4	2.9	4.3
1 1/2	40	2.7	4	3.6	5.3
2	50	3.6	5.4	5	7.5
2 1/2	65	5.8	8.6	7.9	11.7
3	80	7.6	11.2	10.8	15.9
3 1/2	90	9.1	13.5	13.4	19.8
4	100	10.8	16	16.3	24.2
5	125	14.6	21.7	23.2	34.6
6	150	19	28.2	31.5	46.8
8	200	28.5	42.5	50.1	74.6
10	250	40.5	60.2	74.6	111
12	300	51.1	75.9	102	152
14	350	63	93.7	122	181
16	400	83	124	160	237
18	450	105	156	202	301
20	500	123	183	243	362
24	600	171	255	345	514

Source: engineeringtoolbox.com

Pipe Insulation Weight Reference

Weight of stone wool insulation mat applied to pipes varies by pipe size and insulation thickness.

10 rows

Weight of Stone Wool Insulation Mat on Pipes (kg/m of pipe)
Nominal Diameter(mm)	Nominal Diameter(in)	Outside Diameter(mm)	30 mm(kg/m)	40 mm(kg/m)	50 mm(kg/m)	60 mm(kg/m)	80 mm(kg/m)	100 mm(kg/m)	120 mm(kg/m)	140 mm(kg/m)
15	½	21.3	4	5	6	8	11	15	19	24
25	1	33.7	4	5	7	8	12	15	20	25
50	2	60.3	5	7	8	10	13	17	22	27
65	2½	76.1	6	7	9	10	14	18	23	28
80	3	88.9	7	8	10	11	15	19	24	29
100	4	114.3	8	9	11	12	16	21	26	31
200	8	219.1	12	14	16	18	23	28	33	39
300	12	323.9	17	19	21	24	29	35	41	47
500	20	508	25	28	31	34	40	47	54	62
700	28	711	34	37	41	44	52	60	69	78

Source: engineeringtoolbox.com

Calculation Examples

Example 1: 4" Schedule 40 Steel Pipe with Water (SI Units)

Given:

Outside diameter: $d_o = 114.3 \text{ mm} = 0.1143 \text{ m}$
Inside diameter: $d_i = 102.3 \text{ mm} = 0.1023 \text{ m}$
Density of steel: $\rho_m = 7850 \text{ kg/m}^3$
Density of water: $\rho_l = 1000 \text{ kg/m}^3$

Weight of empty pipe:

$w_p = \frac{\pi}{4} \cdot \rho_m (d_o^2 - d_i^2) = \frac{\pi}{4} \cdot 7850 \cdot (0.1143^2 - 0.1023^2) = 16 \text{ kg/m}$

Weight of liquid in pipe:

$w_l = \frac{\pi}{4} \cdot \rho_l \cdot d_i^2 = \frac{\pi}{4} \cdot 1000 \cdot 0.1023^2 = 8.2 \text{ kg/m}$

Weight of pipe filled with water:

$w = w_p + w_l = 16 + 8.2 = 24.2 \text{ kg/m}$

Example 2: 4" Schedule 40 Steel Pipe (Imperial Units)

Given:

Outside diameter: $d_o = 4.500 \text{ in}$
Wall thickness: $t = 0.237 \text{ in}$
Inside diameter: $d_i = 4.026 \text{ in}$
Density of steel: $\rho_m = 0.28 \text{ lb/in}^3$ (490 lb/ft³)

Weight of empty pipe:

$w = \frac{\pi}{4} \cdot 0.28 \cdot (4.500^2 - 4.026^2) = 0.89 \text{ lb/in} = 10.7 \text{ lb/ft}$

Unit Conversions

Common unit conversions for pipe weight calculations:

Quantity	Conversion
Length	$1 \text{ m} = 10^3 \text{ mm}$
Area	$1 \text{ m}^2 = 10^6 \text{ mm}^2$
Length	$1 \text{ in} = 1/12 \text{ ft}$
Area	$1 \text{ in}^2 = 1/144 \text{ ft}^2$
Density	$1 \text{ lb/in}^3 = 1728 \text{ lb/ft}^3$

Material Density Reference

Common pipe material densities used in calculations:

Material	Density (kg/m³)	Density (lb/ft³)
Carbon steel	7,850	490
Stainless steel	8,000	500
Cast iron	7,200	450
Copper	8,900	555
PVC	1,400	87
Water	1,000	62.4

Pipe Weight Calculation

Overview

Key Formulas

Reynolds Number

Bernoulli's Equation

Continuity Equation

Darcy-Weisbach

Variables

Schedule 40 Steel Pipe Weight Reference

Pipe Insulation Weight Reference

Calculation Examples

Example 1: 4" Schedule 40 Steel Pipe with Water (SI Units)

Example 2: 4" Schedule 40 Steel Pipe (Imperial Units)

Unit Conversions

Material Density Reference

Interactive Charts

Pipe - diameter and cross sectional area

Steel pipe schedule 40 - weight with without water

References