Marine flange

The Marine flanges are the flanges for the ships and the flanges are the parts that connect the pipes to the pipes. Connect to the pipe end.

Marine flange cover common several forms

1. Planar Marine flanges

The sealing surface of the Marine flanges is a smooth plane, and sometimes on the cover of the cover, there are two interfaces for the triangular concentric groove. There are various non-metallic flat gaskets, covering pads, metal wrap pads and wound gaskets for the flanges of flat surface Marine flanges. Because of its simple structure and convenient processing, it is convenient for construction in anticorrosive lining. Therefore, it can be used in nominal pressure p < 2.45 MPa. Under the pressure of 0.588 MPa, it is especially suitable for a place with low temperature. But this sealing surface has a large contact area with the gasket, so the pressure is large and the gasket is unsuitable for positioning. After pre-tightening, the gasket is easy to stretch or move on either side. It is not suitable to use this kind of sealing surface for gaskets such as polytetrafluoroethylene. In addition, if the wound gasket is used, the gasket is not made on the sealing surface to reuse the gasket.

2. Embossed surface Marine flanges

The Marine flange cover is composed of a concave surface and a convex surface. The gaskets are placed in the concave. Its applicable gaskets are: various non-metallic flat MATS, covering pads, metal wrap pads, wound gaskets, metal corrugated MATS, metal pads, metal teeth pads. Compared with the plane Marine flange, concave and convex surface in Marine flange gasket is not easy to be squeezed out, when the assembly easy to, work pressure range than plane Marine flange width, requiring relatively heavily used for sealing. But for the high operating temperature and the large diameter of the sealing device, the gasket can still be extruded when the cover is used. A heat exchanger, for example, pressure is 2.45 MPa, the temperature is 250 ℃, using pure aluminium flat gasket. According to the data provided by the table 2-2, pure aluminium using temperature is 425 ℃, its sealing should be reliable. In fact, the heat exchanger is leaking soon after it has been put into operation, and it only lasts for a while. After parking inspection, the inner diameter of gasket is found to be significantly deformed. The reason is that the plasticity of pure aluminum is good, the 250 ℃ when the yield strength is about 15% of the normal temperature, elongation rate is as high as 4 ~ 5 times, that is to say under the high temperature aluminum pad calender, creep phenomenon is serious. Between gasket and Marine flange surface, therefore, cannot maintain the required sealing pressure ratio, so it must be replaced gasket material or by Marine grooved surface concave and convex surface of the flange, and with two Marine flange.

3. Mortise surface Marine flanges

The cover of the Marine flange is composed of a mortise and a groove. The gasket is placed in the slot. Suitable for gaskets: metal and non-metal flat mat, metal cushion, wound pad, etc. Like the concave and convex surface Marine flanges, the mortise surface Marine flanges will not be extruded in the slot, the pressure area is the minimum and the gasket is evenly distributed. Because the gasket is not in direct contact with the medium, the influence of medium corrosion and pressure mechanism is minimal, which can be used for high pressure, flammable, explosive and toxic media. This sealing gasket is installed in neutral, the sealing surface processing and gasket replacement are difficult.

4. Other sealing surface type of Marine flanges

In addition to the above three types of sealing covers, there is a trapezoid groove sealing cover and special sealing cover type of O ring and lens pad.