Carbon Steel WN Flanges and Spiral Wound Gaskets Supplied to Singapore

Haihao Group has recently completed the shipment of a complete flange connection package to a customer in Singapore. The delivery includes carbon steel weld neck flanges, bolting sets, and metal spiral wound gaskets, all manufactured in accordance with GOST 33259 and related international requirements.

This shipment reflects Haihao Group’s ability to supply fully matched flange, gasket, and fastening solutions, ensuring safe, reliable, and efficient pipeline assembly for industrial projects.

Weld Neck Raised Face Flanges – GOST 33259

The order includes weld neck (WN) raised face flanges produced from carbon steel A105, designed for medium- to high-pressure service.

Flange specifications:

• Type: Weld Neck Flange, Raised Face (RF)

• Sizes: DN20 PN40, DN25 PN40

• Material: ASTM A105 Carbon Steel

• Standard: GOST 33259

These GOST 33259 A105 WN flanges offer excellent strength, good weldability, and stable performance under pressure, making them suitable for industrial piping systems such as energy, chemical, and general process pipelines.

Bolting Sets for Flange Assembly

To ensure proper installation and secure sealing, the shipment also includes complete bolting sets, supplied as matched assemblies.

Bolting details:

• Configuration: Bolt + 2 Nuts + 2 Washers
• Size: M12 × 70
• Material: ST35 / ST25

These carbon steel flange bolting sets provide reliable tightening performance and are commonly used with PN40 flange connections.

Metal Spiral Wound Gaskets with Graphite Filler

For sealing performance, Haihao Group supplied metal spiral wound gaskets designed specifically for PN40 flange applications.

Gasket specifications:

• Type: Metal Spiral Wound Gasket
• Sizes: DN20 PN40, DN25 PN40
• Construction: Stainless Steel 304 + Graphite
• Inner Ring: SS 304

The graphite-filled spiral wound gaskets with SS304 inner ring ensure excellent sealing performance under pressure and temperature fluctuations, while maintaining chemical stability and durability.

Integrated Flange, Gasket, and Bolting Supply

By supplying WN flanges, spiral wound gaskets, and bolting sets as a complete package, Haihao Group helps customers reduce procurement complexity and ensure compatibility between all connection components.

This integrated approach improves:

• Installation efficiency
• Sealing reliability
• On-site safety
• Overall project quality control

Reliable Supplier for the Singapore Market

Haihao Group has extensive experience supplying GOST, ASME, and EN standard flanges and sealing products to customers across Southeast Asia. Our product range includes:

• Carbon steel and stainless steel flanges
• Weld neck, slip-on, blind, and threaded flanges
• Spiral wound, ring joint, and custom gaskets
• Complete flange bolting solutions

All products are manufactured with strict dimensional control, material traceability, and quality inspection.