ASTM A888 / CISPI 301 Hubless DWV True ID: 1.5" (38.1 mm) Gravity DWV Spec

1-1/2" Cast Iron Pipe Volume & Capacity Calculator

Standard 1-1/2" nominal Hubless DWV cast iron soil pipe has an exact inside diameter of 1.5 inches, holding 0.0918 US gallons (1.14 liters per meter) per linear foot. Part of our Pipe Volume Calculator and Drain Pipe Slope engineering suite.

Presets:

Calculated Result

Total Liquid Capacity

Internal Holding Volume

1.836 US gallons

≈ 6.95 litres

Unit Conversions

US Gallons 1.836 gal

Litres 6.95 L

Cubic Feet (ft³) 0.2454 ft³

Cubic Inches (in³) 424.12 in³

Imperial Gallons 1.529 UK gal

Cubic Meters (m³) 0.0069 m³

Filled Water Weight 15.3 lbs (6.9 kg)

Linear Capacity Rate 0.0918 gal/ft

Calculations are based on cylindrical formula $V = \pi r^2 L$. Verify dimensions against manufacturer specs for code submittals.

Pre-Calculated Capacity Table

1-1/2" Hubless DWV Cast Iron Quick Reference Chart

Volumetric holding capacity and mechanical dead weight load for 1-1/2" cast iron piping filled with wastewater (62.4 lbs/ft³).

Pipe Length (Ft)	US Gallons	Liters	Cubic Feet (ft³)	Water Weight (lbs)	Dry Pipe (lbs)	Total Wet Load (lbs)
1 ft	0.092 gal	0.35 L	0.012 ft³	0.8 lbs	2.6 lbs	3.4 lbs
2 ft	0.184 gal	0.69 L	0.025 ft³	1.5 lbs	5.2 lbs	6.7 lbs
5 ft	0.459 gal	1.74 L	0.061 ft³	3.8 lbs	13.0 lbs	16.9 lbs
10 ft	0.918 gal	3.47 L	0.123 ft³	7.7 lbs	26.0 lbs	33.7 lbs
20 ft	1.836 gal	6.95 L	0.246 ft³	15.3 lbs	52.0 lbs	67.4 lbs
50 ft	4.59 gal	17.4 L	0.61 ft³	38.3 lbs	130.0 lbs	168.5 lbs
100 ft	9.18 gal	34.7 L	1.23 ft³	76.6 lbs	260.0 lbs	337.0 lbs
200 ft	18.36 gal	69.5 L	2.46 ft³	153.2 lbs	520.0 lbs	674.0 lbs
500 ft	45.90 gal	173.7 L	6.15 ft³	383.0 lbs	1300.0 lbs	1685.0 lbs

Engineering Methodology

How to Calculate 1-1/2" Cast Iron Pipe Volume

Exact cylinder geometry formulas applied to ASTM A888 standard dimensions.

Step 1

Determine Inside Radius ($r$)

Divide ASTM inside diameter by 2:

r = 1.5" / 2 = 0.7500"

Step 2

Compute Cross-Section Area ($A$)

Calculate circular cross-sectional flow area:

A = \pi \times (0.7500)^2 = 1.7671 sq in

Step 3

Calculate Linear Foot Volume

Multiply cross-sectional area by 12 inches (1 linear foot):

V_linear = 1.7671 \times 12 = 21.206 cu in/ft

Step 4

Convert to US Gallons & Weight

Divide cubic inches by 231 (cubic inches in 1 US Gallon):

Gal/Ft = 21.206 / 231 = 0.0918 Gal/Ft

Technical Specifications

1-1/2" Hubless DWV Cast Iron Profile

Physical dimensions, hanger load requirements, and thermal thresholds.

Outside Diameter (OD)

1.9 inches

48.3 mm

Inside Diameter (ID)
1.5 inches
38.1 mm

Wall Thickness

0.2 inches

ASTM A888 Standard

Max Recommended Flow

12 GPM

Gravity drainage velocity

Bare Pipe Weight

2.6 lbs/ft

Unfilled iron load

Max Temperature Limit

212°F

Commercial DWV rated

Common Applications for 1-1/2" Cast Iron Soil Pipe:

Commercial kitchen sink waste arms
Laboratory drain lines
Acoustic-rated quiet DWV stacks

Primary Specification Note: Heavy-duty commercial drainage branches where fire rating and maximum sound deadening are required.

Size Navigation

Compare Related Pipe Sizes & Schedules

Navigate directly to adjacent nominal diameters or alternate pipe materials.

Master Suite Universal Pipe Volume Calculator Larger Size → 2" Cast Iron Soil Pipe Compare PVC Alternative ⇄ 1-1/2" PVC Schedule 40

Expert FAQ Guide

1-1/2" Cast Iron Soil Pipe FAQs

Engineering questions and code guidelines for 1-1/2" hubless cast iron.

3 Questions Answered

Q1 How many gallons of water are in 1 foot of 1-1/2" cast iron pipe?

A standard 1-1/2 inch ASTM A888 hubless cast iron pipe holds approximately 0.0918 US Gallons (0.347 Liters) of water per linear foot.

Q2 What is the inside diameter of 1-1/2" hubless cast iron?

The inside diameter is 1.50 inches (38.1 mm). The outside diameter is 1.90 inches with a nominal wall thickness of 0.20 inches.

Q3 What is the total filled weight of 1-1/2" cast iron per foot?

When full of water, 1-1/2" hubless cast iron weighs approximately 3.37 lbs per linear foot (2.6 lbs pipe + 0.77 lbs water).

Total Liquid Capacity

Unit Conversions

1-1/2" Hubless DWV Cast Iron Quick Reference Chart

How to Calculate 1-1/2" Cast Iron Pipe Volume

Determine Inside Radius ($r$)

Compute Cross-Section Area ($A$)

Calculate Linear Foot Volume

Convert to US Gallons & Weight

1-1/2" Hubless DWV Cast Iron Profile

Common Applications for 1-1/2" Cast Iron Soil Pipe:

Compare Related Pipe Sizes & Schedules

1-1/2" Cast Iron Soil Pipe FAQs

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