ASTM A888 / CISPI 301 Hubless DWV True ID: 5.94" (150.88 mm) Gravity DWV Spec

6" Cast Iron Pipe Volume & Capacity Calculator

Standard 6" nominal Hubless DWV cast iron soil pipe has an exact inside diameter of 5.94 inches, holding 1.4396 US gallons (17.873 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

28.791 US gallons

≈ 108.99 litres

Unit Conversions

US Gallons 28.791 gal

Litres 108.99 L

Cubic Feet (ft³) 3.849 ft³

Cubic Inches (in³) 6,650.80 in³

Imperial Gallons 23.974 UK gal

Cubic Meters (m³) 0.1090 m³

Filled Water Weight 240.1 lbs (109.0 kg)

Linear Capacity Rate 1.4396 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

6" Hubless DWV Cast Iron Quick Reference Chart

Volumetric holding capacity and mechanical dead weight load for 6" 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	1.440 gal	5.45 L	0.192 ft³	12.0 lbs	12.4 lbs	24.4 lbs
2 ft	2.879 gal	10.90 L	0.385 ft³	24.0 lbs	24.8 lbs	48.8 lbs
5 ft	7.198 gal	27.24 L	0.962 ft³	60.0 lbs	62.0 lbs	122.0 lbs
10 ft	14.396 gal	54.48 L	1.924 ft³	120.1 lbs	124.0 lbs	244.1 lbs
20 ft	28.792 gal	108.95 L	3.848 ft³	240.1 lbs	248.0 lbs	488.2 lbs
50 ft	71.98 gal	272.4 L	9.62 ft³	600.3 lbs	620.0 lbs	1220.5 lbs
100 ft	143.96 gal	544.8 L	19.24 ft³	1200.6 lbs	1240.0 lbs	2441.0 lbs
200 ft	287.92 gal	1089.5 L	38.48 ft³	2401.2 lbs	2480.0 lbs	4882.0 lbs
500 ft	719.80 gal	2723.8 L	96.20 ft³	6003.0 lbs	6200.0 lbs	12205.0 lbs

Engineering Methodology

How to Calculate 6" 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 = 5.94" / 2 = 2.9700"

Step 2

Compute Cross-Section Area ($A$)

Calculate circular cross-sectional flow area:

A = \pi \times (2.9700)^2 = 27.7117 sq in

Step 3

Calculate Linear Foot Volume

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

V_linear = 27.7117 \times 12 = 332.540 cu in/ft

Step 4

Convert to US Gallons & Weight

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

Gal/Ft = 332.540 / 231 = 1.4396 Gal/Ft

Technical Specifications

6" Hubless DWV Cast Iron Profile

Physical dimensions, hanger load requirements, and thermal thresholds.

Outside Diameter (OD)

6.3 inches

160.0 mm

Inside Diameter (ID)
5.94 inches
150.88 mm

Wall Thickness

0.18 inches

ASTM A888 Standard

Max Recommended Flow

320 GPM

Gravity drainage velocity

Bare Pipe Weight

12.4 lbs/ft

Unfilled iron load

Max Temperature Limit

212°F

Commercial DWV rated

Common Applications for 6" Cast Iron Soil Pipe:

Municipal building sewers
High-rise main vertical DWV stacks
Commercial parking garage storm drainage

Primary Specification Note: Large commercial building sewer mains carrying high drainage fixture unit (DFU) loads under high mechanical vibration environments.

Size Navigation

Compare Related Pipe Sizes & Schedules

Navigate directly to adjacent nominal diameters or alternate pipe materials.

← Smaller Size 4" Cast Iron Soil Pipe Master Suite Universal Pipe Volume Calculator Larger Size → 8" Cast Iron Soil Pipe Compare PVC Alternative ⇄ 6" PVC Schedule 40

Expert FAQ Guide

6" Cast Iron Soil Pipe FAQs

Engineering questions and code guidelines for 6" hubless cast iron.

3 Questions Answered

Q1 How many gallons of water are in 1 foot of 6" cast iron pipe?

A standard 6 inch hubless cast iron soil pipe holds 1.4396 US Gallons (5.449 Liters) of water per linear foot.

Q2 What is the inside diameter of 6" cast iron?

The inside diameter is 5.94 inches (150.88 mm), with an outer diameter of 6.30 inches.

Q3 What hanger spacing is required for 6" cast iron pipe full of water?

Because 6" cast iron pipe full of water weighs 24.41 lbs per foot, building codes require robust clevis hangers at every joint (maximum 5-foot or 10-foot intervals per CISPI guidelines).

Total Liquid Capacity

Unit Conversions

6" Hubless DWV Cast Iron Quick Reference Chart

How to Calculate 6" Cast Iron Pipe Volume

Determine Inside Radius ($r$)

Compute Cross-Section Area ($A$)

Calculate Linear Foot Volume

Convert to US Gallons & Weight

6" Hubless DWV Cast Iron Profile

Common Applications for 6" Cast Iron Soil Pipe:

Compare Related Pipe Sizes & Schedules

6" Cast Iron Soil Pipe FAQs

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