ASTM A888 / CISPI 301 Hubless DWV True ID: 3.94" (100.08 mm) Gravity DWV Spec

4" Cast Iron Pipe Volume & Capacity Calculator

Standard 4" nominal Hubless DWV cast iron soil pipe has an exact inside diameter of 3.94 inches, holding 0.6334 US gallons (7.864 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

12.667 US gallons

≈ 47.951 litres

Unit Conversions

US Gallons 12.667 gal

Litres 47.951 L

Cubic Feet (ft³) 1.693 ft³

Cubic Inches (in³) 2,926.13 in³

Imperial Gallons 10.548 UK gal

Cubic Meters (m³) 0.0480 m³

Filled Water Weight 105.6 lbs (48.0 kg)

Linear Capacity Rate 0.6334 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

4" Hubless DWV Cast Iron Quick Reference Chart

Volumetric holding capacity and mechanical dead weight load for 4" 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	0.633 gal	2.40 L	0.085 ft³	5.3 lbs	7.8 lbs	13.1 lbs
2 ft	1.267 gal	4.79 L	0.169 ft³	10.6 lbs	15.6 lbs	26.2 lbs
5 ft	3.167 gal	11.98 L	0.423 ft³	26.4 lbs	39.0 lbs	65.4 lbs
10 ft	6.334 gal	23.97 L	0.847 ft³	52.8 lbs	78.0 lbs	130.8 lbs
20 ft	12.668 gal	47.94 L	1.694 ft³	105.6 lbs	156.0 lbs	261.6 lbs
50 ft	31.67 gal	119.8 L	4.23 ft³	264.1 lbs	390.0 lbs	654.0 lbs
100 ft	63.34 gal	239.7 L	8.47 ft³	528.2 lbs	780.0 lbs	1308.0 lbs
200 ft	126.68 gal	479.4 L	16.94 ft³	1056.4 lbs	1560.0 lbs	2616.0 lbs
500 ft	316.70 gal	1198.5 L	42.35 ft³	2641.0 lbs	3900.0 lbs	6540.0 lbs

Engineering Methodology

How to Calculate 4" 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 = 3.94" / 2 = 1.9700"

Step 2

Compute Cross-Section Area ($A$)

Calculate circular cross-sectional flow area:

A = \pi \times (1.9700)^2 = 12.1922 sq in

Step 3

Calculate Linear Foot Volume

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

V_linear = 12.1922 \times 12 = 146.306 cu in/ft

Step 4

Convert to US Gallons & Weight

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

Gal/Ft = 146.306 / 231 = 0.6334 Gal/Ft

Technical Specifications

4" Hubless DWV Cast Iron Profile

Physical dimensions, hanger load requirements, and thermal thresholds.

Outside Diameter (OD)

4.38 inches

111.3 mm

Inside Diameter (ID)
3.94 inches
100.08 mm

Wall Thickness

0.22 inches

ASTM A888 Standard

Max Recommended Flow

120 GPM

Gravity drainage velocity

Bare Pipe Weight

7.8 lbs/ft

Unfilled iron load

Max Temperature Limit

212°F

Commercial DWV rated

Common Applications for 4" Cast Iron Soil Pipe:

Building main house drain and sewer connections
Commercial multi-floor DWV vertical risers
Primary storm drainage leaders

Primary Specification Note: Commercial and multi-family main building sewers requiring 100-year service life, non-combustible building code compliance, and structural crushing resistance.

Size Navigation

Compare Related Pipe Sizes & Schedules

Navigate directly to adjacent nominal diameters or alternate pipe materials.

← Smaller Size 3" Cast Iron Soil Pipe Master Suite Universal Pipe Volume Calculator Larger Size → 6" Cast Iron Soil Pipe Compare PVC Alternative ⇄ 4" PVC Schedule 40

Expert FAQ Guide

4" Cast Iron Soil Pipe FAQs

Engineering questions and code guidelines for 4" hubless cast iron.

3 Questions Answered

Q1 How many gallons of water are in 1 foot of 4" cast iron pipe?

A standard 4 inch ASTM A888 hubless cast iron pipe holds 0.6334 US Gallons (2.398 Liters) of water per linear foot.

Q2 How many feet of 4" cast iron pipe hold 100 gallons?

It takes approximately 157.9 linear feet of 4-inch cast iron pipe to hold 100 US Gallons of water.

Q3 What is the full filled weight of 4" cast iron pipe?

When full of water, 4-inch cast iron pipe weighs 13.08 lbs per linear foot (7.8 lbs empty pipe + 5.28 lbs water).

Total Liquid Capacity

Unit Conversions

4" Hubless DWV Cast Iron Quick Reference Chart

How to Calculate 4" Cast Iron Pipe Volume

Determine Inside Radius ($r$)

Compute Cross-Section Area ($A$)

Calculate Linear Foot Volume

Convert to US Gallons & Weight

4" Hubless DWV Cast Iron Profile

Common Applications for 4" Cast Iron Soil Pipe:

Compare Related Pipe Sizes & Schedules

4" Cast Iron Soil Pipe FAQs

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