ASTM A888 / CISPI 301 Hubless DWV True ID: 7.94" (201.68 mm) Gravity DWV Spec

8" Cast Iron Pipe Volume & Capacity Calculator

Standard 8" nominal Hubless DWV cast iron soil pipe has an exact inside diameter of 7.94 inches, holding 2.5721 US gallons (31.935 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

51.443 US gallons

≈ 194.73 litres

Unit Conversions

US Gallons 51.443 gal

Litres 194.73 L

Cubic Feet (ft³) 6.877 ft³

Cubic Inches (in³) 11,883.4 in³

Imperial Gallons 42.836 UK gal

Cubic Meters (m³) 0.1947 m³

Filled Water Weight 429.0 lbs (194.7 kg)

Linear Capacity Rate 2.5722 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

8" Hubless DWV Cast Iron Quick Reference Chart

Volumetric holding capacity and mechanical dead weight load for 8" 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	2.572 gal	9.73 L	0.344 ft³	21.5 lbs	19.5 lbs	41.0 lbs
2 ft	5.144 gal	19.47 L	0.688 ft³	42.9 lbs	39.0 lbs	81.9 lbs
5 ft	12.860 gal	48.67 L	1.719 ft³	107.3 lbs	97.5 lbs	204.8 lbs
10 ft	25.721 gal	97.34 L	3.438 ft³	214.5 lbs	195.0 lbs	409.5 lbs
20 ft	51.442 gal	194.68 L	6.876 ft³	429.0 lbs	390.0 lbs	819.0 lbs
50 ft	128.60 gal	486.7 L	17.19 ft³	1072.5 lbs	975.0 lbs	2047.5 lbs
100 ft	257.21 gal	973.4 L	34.38 ft³	2145.1 lbs	1950.0 lbs	4095.0 lbs
200 ft	514.42 gal	1946.8 L	68.76 ft³	4290.2 lbs	3900.0 lbs	8190.0 lbs
500 ft	1286.05 gal	4866.9 L	171.90 ft³	10725.5 lbs	9750.0 lbs	20475.0 lbs

Engineering Methodology

How to Calculate 8" 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 = 7.94" / 2 = 3.9700"

Step 2

Compute Cross-Section Area ($A$)

Calculate circular cross-sectional flow area:

A = \pi \times (3.9700)^2 = 49.5143 sq in

Step 3

Calculate Linear Foot Volume

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

V_linear = 49.5143 \times 12 = 594.172 cu in/ft

Step 4

Convert to US Gallons & Weight

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

Gal/Ft = 594.172 / 231 = 2.5721 Gal/Ft

Technical Specifications

8" Hubless DWV Cast Iron Profile

Physical dimensions, hanger load requirements, and thermal thresholds.

Outside Diameter (OD)

8.38 inches

212.9 mm

Inside Diameter (ID)
7.94 inches
201.68 mm

Wall Thickness

0.22 inches

ASTM A888 Standard

Max Recommended Flow

650 GPM

Gravity drainage velocity

Bare Pipe Weight

19.5 lbs/ft

Unfilled iron load

Max Temperature Limit

212°F

Commercial DWV rated

Common Applications for 8" Cast Iron Soil Pipe:

Major industrial waste mains
Hospitality and stadium central sewer outfalls
Primary storm detention discharge lines

Primary Specification Note: Heavy industrial and institutional facility primary drainage arteries where thermal shock resistance and zero toxic smoke propagation are paramount.

Size Navigation

Compare Related Pipe Sizes & Schedules

Navigate directly to adjacent nominal diameters or alternate pipe materials.

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

Expert FAQ Guide

8" Cast Iron Soil Pipe FAQs

Engineering questions and code guidelines for 8" hubless cast iron.

2 Questions Answered

Q1 How many gallons of water are in 1 foot of 8" cast iron pipe?

A standard 8 inch hubless cast iron soil pipe holds 2.5721 US Gallons (9.736 Liters) of water per linear foot.

Q2 How much does 100 feet of 8" cast iron soil pipe weigh full?

100 feet of 8" cast iron pipe full of water weighs approximately 4,095 lbs (1,950 lbs bare pipe + 2,145 lbs water weight).

Total Liquid Capacity

Unit Conversions

8" Hubless DWV Cast Iron Quick Reference Chart

How to Calculate 8" Cast Iron Pipe Volume

Determine Inside Radius ($r$)

Compute Cross-Section Area ($A$)

Calculate Linear Foot Volume

Convert to US Gallons & Weight

8" Hubless DWV Cast Iron Profile

Common Applications for 8" Cast Iron Soil Pipe:

Compare Related Pipe Sizes & Schedules

8" Cast Iron Soil Pipe FAQs

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