| Standard: | ANSI, DIN, GB, JIS, GOST, BSW |
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| Type: | Blind Flange |
| Material: | Carbon Steel |
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It has the appearance of a solid circular plate, with bolt holes around it. There is no neck of the welded flange, and there are various forms of sealing surfaces, such as flat surface, convex surface, male and female surface, tongue and groove surface, and ring joint surface, etc. The materials include carbon steel, stainless steel, alloy steel, copper, and aluminum. It mainly plays the roles of sealing, isolation, and cutting off, which can prevent the medium in the pipeline from leaking or overflowing, and is used for equipment testing, pressure testing, etc. Its advantages are that it can be disassembled at any time, is convenient to connect and use, can withstand a relatively large pressure, has high mechanical strength, strong sealing performance, and good chemical stability. It is widely applied in industries such as petroleum, chemical engineering, shipbuilding, pharmaceuticals, metallurgy, machinery, and food.
| Structural Length | For blind flanges with different connection forms, their structural lengths vary. For example, the structural length of a butt-welding blind flange generally refers to the distance from the sealing surface of the flange to the back of the flange. This parameter is related to factors such as pipeline layout and installation space. Common dimensions range from dozens of millimeters to several hundred millimeters, and the specific values change according to the nominal diameter and pressure class. |
| Flange Type | Common types include flat welding blind flanges for plate type, slip-on welding blind flanges with a neck, butt-welding blind flanges with a neck, socket welding blind flanges, threaded blind flanges, etc. Different types of flanges are suitable for different working conditions and pipeline connection requirements. For instance, butt-welding blind flanges with a neck are suitable for pipeline systems with high temperature, high pressure, and strict sealing requirements, while flat welding blind flanges for plate type are commonly used for low-pressure and non-critical pipeline connections. |
| Weight | The weight of a blind flange is closely related to factors such as material, size, and thickness. Generally speaking, the weight of a carbon steel blind flange with DN100 and PN16 may be around 5kg - 10kg. For a stainless steel blind flange of the same specification, due to the relatively high density of the stainless steel material, the weight may be around 6kg - 12kg. The weight has an important impact on operations such as hoisting during transportation and installation. |
| Applicable Temperature Range | The applicable temperature ranges of blind flanges made of different materials are different. Carbon steel blind flanges are generally suitable for a temperature range of -20°C - 450°C; the applicable temperature range of 304 stainless steel blind flanges is generally around -196°C - 800°C; and the applicable temperature range of 316 stainless steel blind flanges is approximately -196°C - 850°C. The actual operating temperature also needs to take into account the influence of factors such as the characteristics of the medium and pressure. |
| Hardness | It is usually expressed by Brinell hardness (HB) or Rockwell hardness (HRC). For example, the Brinell hardness of a general carbon steel blind flange may be between 120HB - 200HB. For a stainless steel blind flange after processes such as heat treatment, its Rockwell hardness may reach around HRC25 - HRC35. The hardness affects the wear resistance and deformation resistance of the flange. |
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