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Marine Applications 316L Stainless Steel Slip On Flanges custom

Marine Applications 316L Stainless Steel Slip On Flanges Manufacturers

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Corrosion-Resistant Marine Slip On Flanges

Slip-On Flanges are a cost-effective and versatile flange type widely used in marine and offshore piping systems where ease of installation and alignment flexibility are paramount. Our 316L Stainless Steel Slip-On Flanges are specifically manufactured for marine environments where exposure to salt spray, seawater immersion, and high humidity demands superior corrosion resistance. The 2% minimum molybdenum content in 316L provides critical protection against chloride-induced pitting and crevice corrosion that would rapidly degrade standard 304 steel. As a specialized manufacturer, we ensure that our slip-on flanges are precision-machined with a close fit-up to the pipe OD to maintain concentricity during the dual fillet weld installation. These flanges are an economical alternative to weld neck flanges in lower pressure marine service, offering a quick-installation solution without compromising on material quality. They are available in all standard ANSI pressure classes and metric DN sizes to suit both new vessel construction and retrofit projects.

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Slip On Flange Specifications

ParameterMarine Grade Detail
Material GradeASTM A182 F316L (UNS S31603)
Design StandardASME B16.5, EN 1092-1 Type 11, JIS B2220
Pressure ClassClass 150 to Class 600
Size Range1/2" to 24" (DN15 - DN600)
Facing OptionsRaised Face (RF), Flat Face (FF)
CertificationABS, DNV-GL, Lloyd's Register approved

Marine & Offshore Applications

316L Stainless Steel Slip-On Flanges are widely deployed across the full range of marine piping systems. On commercial vessels and naval ships, they connect seawater cooling lines, ballast water systems, and fire-fighting mains where chloride resistance is non-negotiable. In offshore oil and gas platforms, they are used for non-critical process lines, deck drains, and utility water distribution systems. Cruise ships and ferries utilize them extensively for HVAC cooling systems, potable water distribution, and sanitary drainage networks. In marine desalination units, 316L slip-on flanges handle the seawater feed and brine concentrate discharge lines. Shipyard fabricators favor them for their ease of installation in tight spaces where precise pipe alignment is difficult. They are also used in port and harbor infrastructure for seawater intake screens and pump discharge manifolds where periodic maintenance access is required.

Material & Installation Advantages

  • Superior Chloride Resistance: 316L molybdenum content prevents the pitting corrosion that would destroy standard 304 flanges within months in marine environments.
  • Easy Installation: Slip-over design allows pipe length adjustment during installation, reducing fabrication waste and simplifying shipyard assembly.
  • Low Carbon Weldability: 316L's reduced carbon content prevents sensitization and maintains corrosion resistance in the weld heat-affected zone.
  • Marine Classification Approval: Manufactured to meet the requirements of major marine classification societies for certified shipboard use.

Shipyard Supply & Logistics

We support payments via T/T, Irrevocable L/C, and open account for qualified shipyard partners. We maintain a comprehensive inventory of standard 316L slip-on flanges for immediate dispatch to support tight shipbuilding and dry-dock maintenance schedules. Flanges are pickled and passivated as standard and are individually capped to protect the sealing face. We use moisture-resistant packaging for sea freight to prevent surface staining during transit. Full documentation is provided with each shipment, including 3.1 Mill Test Certificates, PMI verification reports, and classification society certificates upon request. Our logistics team is experienced in coordinating deliveries to major global shipbuilding centers, including direct-to-shipyard delivery with vessel-specific packing lists.

  • Q: What is the structural difference between a slip-on and a weld neck flange?
  • A: A slip-on flange slides over the pipe and is secured with two fillet welds (inside and outside), while a weld neck flange uses a single full-penetration butt weld. Weld necks are stronger and better for high-pressure critical service.
  • Q: Can 316L slip-on flanges be used in submerged seawater service?
  • A: Yes, 316L is suitable for submerged seawater service at moderate temperatures. For very high chloride concentration or elevated temperature seawater, Duplex or Super Duplex grades may be recommended.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Marine Applications 316L Stainless Steel Slip On Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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