Marine and offshore classification documents
ABS Approved Factory for Seamless Stainless Steel Pipe
Review the American Bureau of Shipping (ABS) Product Design Assessment (PDA) and Manufacturing Assessment (MA) documents for stainless steel pipe manufactured at Zhejiang Xintongda’s Songyang facility. Wenzhou Xinzhe handles global export marketing and supply enquiries for customers sourcing ASTM A312 and ASTM A790 pipe for marine and offshore process piping.
Download PDA certificate (PDF) Download MA certificate (PDF)
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Key facts
Manufacturing factory · Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (浙江鑫通达特钢制造有限公司). The ABS documents identify this manufacturer and its facility in Songyang County, Lishui, Zhejiang, China.
Global export marketing and supply · Wenzhou Xinzhe Tech Co., Ltd. (温州信哲科技有限公司). Contact Wenzhou Xinzhe for export enquiries, quotations and order coordination.
Standards and grades: ASTM A312/A312M (TP304L, TP316L, TP310S) and ASTM A790/A790M (UNS S32205 duplex 2205, UNS S32750 super duplex 2507).
Service: marine and offshore process piping only, with Unit Certification required for Piping Class I and II except for hydraulic piping.
Documents: PDA 26-00T2545638-PDA (listed expiry 10 March 2031) and MA 486933-7757620-006 (listed expiry 18 August 2031).
What ABS assesses
The American Bureau of Shipping is a classification society for marine vessels and offshore units. Its rules address design, materials, construction and survey. A Product Design Assessment evaluates a defined product design against applicable requirements. For procurement, the PDA record helps you identify the product and service assessed and the conditions that apply to certification of the supply.
The PDA database extract supplied with this page shows no Confirmation of Type Approval. The separate MA certificate has its own effective date and scope. For current product status and the applicable certification route, consult ABS using the document numbers on this page. Where Unit Certification is required, arrange the inspection and test witnessing with ABS.
ABS Manufacturing Assessment (MA)
The MA certificate records ABS’s assessment of the manufacturing quality procedures and production monitoring at Xintongda’s Songyang facility. The listed product is stainless steel pipe covered by valid PDAs. Grade, size and service conditions are set out in the applicable PDA.
- Certificate number
- 486933-7757620-006
- Effective date shown on certificate
- Expiry date shown on certificate
- Manufacturing site
- No. 209 Ruiyang Avenue, Xiping Street, Songyang County, Lishui City, Zhejiang Province, China
The certificate applies to the named manufacturer and location and is subject to annual audits.
ASTM A312 and ASTM A790 pipe grades and sizes
The table follows the Model field of the PDA record. It includes UNS S32205 duplex 2205 and UNS S32750 super duplex 2507 for the process piping service stated in the record.
| Product standard | Listed grades | Listed OD × wall thickness (mm) |
|---|---|---|
| ASTM A312/A312M (2025) Austenitic stainless steel pipe |
TP304L, TP316L, TP310S | 323.9 × 12.7 168.3 × 7.11 10 × 1.0 |
| ASTM A790/A790M (2024) Duplex and super duplex stainless steel pipe |
UNS S32205, UNS S32750 | 323.9 × 12.7 168.3 × 7.11 10 × 1.0 |
The record lists cold drawing and cold rolling as manufacturing processes and solution treatment as the delivery condition. Its Ratings field specifies a maximum OD of 323.9 mm and a maximum wall thickness of 12.7 mm for duplex stainless steels. Confirm the exact grade and size combination for your order.
Grade confirmation. The Description field separately refers to TP304/304L, TP316/316L, S31803/S32205 and S32750. It omits TP310S, which appears in the Model field. If your enquiry depends on TP304, TP316, S31803 or TP310S, confirm the applicable scope with Xintongda and ABS before ordering.
Service restrictions and inspection requirements
- Intended service. Marine and offshore process piping only. Service temperature and pressure are subject to piping-system design review.
- Unit Certification. The record requires it for Piping Class I and II, with an exception for hydraulic piping. For certification, the applicable mechanical tests are witnessed to the satisfaction of the attending ABS Surveyor.
- Special services. The record cites additional requirements for liquefied gas carriers, vessels using gases or other low-flashpoint fuels, and refrigerated cargo. It requires prior notice to ABS for CNG or structural pipe use.
- Mill testing and finish. The record calls for hydrostatic testing of each pipe length at the mill and describes purchaser-specified nondestructive electrical testing for seamless pipe. It also calls for descaling, pickling and passivation in accordance with ASTM A380 before delivery.
Download the ABS PDA record
The three-page database record gives the complete scope, service restrictions and referenced rules. Confirm current status in the ABS database using the manufacturer name or the model certificate number.
Download 3-page PDA record (PDF) Download PDA certificate (PDF) Search the ABS database
ABS factory documentation FAQ
Whose factory is covered by these ABS documents?
The ABS documents identify Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. and its Songyang facility in Lishui, Zhejiang, China. Wenzhou Xinzhe Tech Co., Ltd. handles global export marketing, quotations and supply coordination.
Which pipe grades does the ABS PDA list?
The PDA Model field lists ASTM A312/A312M grades TP304L, TP316L and TP310S, and ASTM A790/A790M grades UNS S32205 (duplex 2205) and UNS S32750 (super duplex 2507).
Does the MA cover all sizes of duplex and super duplex pipe?
The MA scope is stainless steel pipe covered by valid PDAs at the named site. Grade, size and service conditions are set out in the applicable PDA, so confirm the exact grade, outside diameter, wall thickness and intended service before ordering.
When is ABS Unit Certification required?
The PDA record requires Unit Certification for Piping Class I and II, with an exception for hydraulic piping. Confirm the certification and test witness requirements for your specific order.
What is the difference between an ABS PDA and an ABS MA?
A Product Design Assessment evaluates a defined product design against applicable requirements. A Manufacturing Assessment records ABS’s assessment of the manufacturer’s quality procedures and production monitoring at a named facility.
How can I verify the ABS certificates?
Search the ABS type approval database using the manufacturer name or model certificate number 26-00T2545638-PDA. Use ABS e-Certificate for the MA certificate 486933-7757620-006.
Request a scope check for your project
Send the ASTM specification and edition, grade, OD × wall thickness, piping class, intended service, and any inspection or witness requirements. Include project-specific tolerances and documentation needs so Wenzhou Xinzhe can coordinate the scope review with the factory. Confirm the applicable certification route with ABS.
Contact Wenzhou Xinzhe Browse stainless and duplex pipe products
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