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  Haihao Group delivers high-quality SS316 spiral wound gasket

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  Custom flanges for SOLAS international shore connection: Haihao Group’s expertise in marine engineering

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  Quality inspection of ASME B16.5 A350 GR.LF2CL.1 blind flange

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  Strict quality requirements meet for API 6A RTJ A694 Gr. 60 PSL3 blind flange

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  EN 1092-1 RSt 37.2 RF weld neck flanges ready for delivery

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  The role of serrated gasket surfaces on flanges

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  Delivery of GOST 33259 weld neck flanges with RTJ and RF sealing faces

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  Delivery of Q235B flat flanges to Australia

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  ASME B16.5 RTJ A182 F22 CL.1 blind flanges delivered to Singapore

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  ASME B16.5 A105N hot-galvanized reducing thread flanges ready for UAE shipment

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  How to minimize bending and wave-like deformation in overlay welding of slender shafts and large thin-walled cylinders

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  ASTM A182 F51 S31803 JIS B2220 10K RF blind flanges delivered to Singapore

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  The purpose and procedure of the red lead test for octagonal gaskets and high-pressure flanges

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  Applications and techniques of overlay welding for different materials and operational requirements

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  Delivering LDPE flange covers for enhanced pipe protection

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  Strict quality inspection of S235JR DIN flanges

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  Introduction to DIN 2502 S235JR PN16 PL Flange

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  The difference between threaded flanges and weld neck flanges

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  What is reducing threaded flanges？

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  Introduction to basic type wound metal and non-metal strips of spiral wound gaskets

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  How to choose the inner ring of spiral wound gasket and the material of spiral wound metal belt？

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  Haihao Group welcomes you to visit us at ADIPEC in Abu Dhabi

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  The difference between RF and RTJ sealing faces

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  Methods for preventing and controlling heat treatment deformation