ASTM A746 is the ASTM specification for ductile iron gravity sewer pipe. It is used for centrifugally cast ductile iron pipe for sewer service, with push-on joints as the standard configuration.
Unlike a stand-alone bench test method, ASTM A746 combines product requirements with trench load design guidance, depth-of-cover tables, hydrostatic proof testing, and acceptance or control testing tied to pipe production and purchase. If you need help matching the cited edition to a practical QA or lab setup, Contact Us.
ASTM A746: Standard Specification for Ductile Iron Gravity Sewer Pipe
ASTM A746 is a specification used when ductile iron gravity sewer pipe must meet defined dimensional, structural, and verification requirements. It covers the pipe product itself, the joint style commonly associated with the standard, burial design considerations, and key acceptance checks.
Because it is a specification, the equipment path is broader than one instrument. A typical ASTM A746 program may involve hydrostatic pipe testing, mechanical-property testing on required samples, and dimensional inspection alongside trench and cover design review.
Quick Definition
ASTM A746 covers 4 to 64 in. ductile iron gravity sewer pipe, centrifugally cast, with push-on joints, while also allowing other joint types when agreed upon at the time of purchase.
| Item | ASTM A746 at a Glance |
|---|---|
| Document type | Specification |
| Product covered | Ductile iron gravity sewer pipe |
| Nominal size range | 4 to 64 in. |
| Common verification focus | Hydrostatic testing, acceptance or control testing, dimensional checks, and burial design review |
What This Standard Covers
ASTM A746 applies to ductile iron gravity sewer pipe that is centrifugally cast and ordinarily furnished with push-on joints. The standard may also be used for pipe with other joint types when that arrangement is agreed upon at purchase.
It also includes trench load design procedures for both cement-lined pipe and flexible-lined pipe, with maximum depth-of-cover tables for those lining categories. That makes ASTM A746 important not only for product acceptance, but also for how the pipe is selected for buried sewer service.
Why This Standard Matters in Testing
ASTM A746 matters because compliance is not based on dimensions alone. The specification includes a hydrostatic test for each pipe and also contains acceptance and additional control testing provisions that support verification of the product before installation.
For many buyers and QA teams, this means ASTM A746 shapes a broader workflow that links production quality control, sample testing, and project design review. It is best understood as a product specification with defined verification steps, not as one single machine procedure.
Common Materials, Product Types, or Applications Covered
This standard is centered on centrifugally cast ductile iron pipe used for gravity sewer systems. It is commonly relevant where buried sewer lines need a ductile iron pipe option with defined joint, lining, and structural selection guidance.
Common product form: Ductile iron gravity sewer pipe with push-on joints.
Common lining context: Cement-lined pipe and flexible-lined pipe are both addressed in the design guidance.
Common application context: Municipal and site sewer installations where product selection must be coordinated with burial and cover conditions.
Common Test or Verification Workflow
A practical ASTM A746 workflow usually begins with the cited edition and the ordered pipe configuration. Teams typically confirm the pipe size, joint arrangement, lining category, and any project-specific agreement on alternative joints before moving into verification.
From there, the workflow commonly includes dimensional checks, wall-thickness review, hydrostatic proof testing of the pipe, and required acceptance or control tests on samples covered by the specification. Trench load and cover assumptions are then reviewed against the intended installation conditions.
Common workflows: Pipe hydrostatic testing, tensile sample testing, impact sample testing, dimensional inspection, and trench/load review.
Equipment Commonly Used for This Standard
Because ASTM A746 is a specification, equipment selection usually spans more than one station. The exact mix depends on whether the work is being done for production QA, incoming inspection, project qualification, or third-party verification.
- Hydrostatic pipe test equipment for proof testing finished pipe to the required pressure and hold conditions.
- Universal testing machines for tension testing of machined ductile iron samples used in acceptance or control testing.
- Charpy impact testing equipment when impact verification is part of the required test program.
- Dimensional inspection tools for checking diameter, wall thickness, joint features, and finished pipe dimensions.
If you are comparing hydrostatic systems or mechanical test frames for ASTM A746 work, Request a Quote.
How to Read This Designation or Revision
In ASTM designation format, A746 is the fixed standard number. The year after the dash identifies the year associated with that edition, and a year in parentheses identifies the last reapproval. An epsilon suffix indicates an editorial change.
Example: ASTM A746-18(2022) identifies the A746 standard, a 2018 edition, and a 2022 reapproval.
Revision sensitivity: Purchase requirements, referenced companion standards, and acceptance details should be matched to the exact edition named in the contract documents.
Related Standards, Methods, or Frameworks
ASTM A746 is often used alongside companion documents for lining, joints, thickness design, installation, and sample-level materials testing. The exact combination depends on the project specification and purchase order.
- ANSI/AWWA C104/A21.4 for cement-mortar lining.
- ANSI/AWWA C111/A21.11 for rubber-gasket joints.
- ANSI/AWWA C150/A21.50 for thickness design.
- ANSI/AWWA C600 for installation practices.
- ASTM E8/E8M for tension testing and ASTM E23 for Charpy impact testing.
For procurement and compliance work, the controlling references should always be taken from the cited project documents rather than assumed from a general pipe program.
Need Help Matching ASTM A746 to the Right Test System?
Whether you need a hydrostatic setup, a tensile system for ductile iron samples, or help deciding how ASTM A746 fits your broader sewer pipe QA workflow, our team can help narrow the right approach. Contact Us.