Integral Flange(Long Weld Neck Flanges) are used for high pressure situations, integral hub weld neck flanges are used and for very high pressure cases Long Welding Neck flanges are preferred. In this case, the weld are far from the ring to avoid bending stresses and weld stress being combined.
Haihao Integral flanges (Long Weld Neck Flenge)are available in various sizes and material for you to choose from.
Class 150 ,Class 300, Class 600, Class 900A ,Class 1500,Class 2500.
Natural gas,chemical,petroleum,ship building,marine,paper making,metallurgy,electric, power,boiler etc.
Hebei Haihao group as a first class manufacturer of Integral Flange(Long Weld Neck Flange) in China,supplys a variety of steel flanges to satisfy our customers’ specifica requirements,which include different size,different schedule,different pressure and different finish faces. Our products are produced strictly according to the required standard. Our raw material for weld neck flanges all are purchased from big steel companies which can make sure the material in a high quality.
We sincerely welcome customers domestic and abroad to visit us for cooperation and development.