In the operating system of chemical pumps, sealing components are crucial for ensuring the stable and safe operation of equipment. Metal wound gaskets have become a common choice in the field of chemical pump sealing due to their excellent sealing performance and adaptability. This article will elaborate on the core knowledge of metal wound gaskets in chemical pump applications from aspects such as their basic characteristics, key selection points, installation specifications, and maintenance considerations.
Metal wound gaskets are composed of alternating layers of metal strips and non-metallic filler strips. In terms of chemical stability, the material of the metal strip can be selected based on the corrosiveness of the medium transported by the chemical pump. For example, 304 stainless steel strips are suitable for weakly corrosive media, while 316L stainless steel strips are suitable for strongly corrosive media. The non-metallic filler strips can also adapt to various acid and alkali environments, effectively preventing the gasket from being eroded by the medium.
At the same time, the wound structure endows the gasket with good compression and resilience performance. The compression rate is usually 15%-30%, and the resilience rate is not less than 10%. This allows the gasket to compensate for slight deformation and vibration of the flange surface during the operation of the chemical pump, maintaining a stable sealing effect.
In addition, this type of gasket also has strong high-temperature and pressure resistance. Regular models can withstand a temperature range of -200℃ to 650℃ and a maximum pressure of 42MPa, which can meet the requirements of temperature and pressure changes under different working conditions in chemical production, providing reliable sealing guarantees for the long-term safe operation of chemical pumps.
The rationality of selection is directly related to the sealing effect and service life of metal wound gaskets, and the following aspects should be focused on:
First, medium characteristics: Based on parameters such as the corrosiveness and viscosity of the medium transported by the chemical pump, select matching materials for the metal strip and filler strip to ensure that no chemical reaction occurs between the gasket and the medium.
Second, operating conditions: Combine the temperature and pressure range of the chemical pump during operation, and select gasket models with corresponding pressure levels and temperature resistance capabilities. For example, for working conditions with PN1.6MPa, gaskets with a pressure level not lower than this standard should be selected.
Third, flange type: Different flange sealing surface forms have specific requirements for the structural size of the gasket. The inner diameter, outer diameter, thickness and other parameters of the gasket should be determined according to the actual specifications of the chemical pump flange to avoid sealing failure due to mismatched sizes.
The "M" and "Y" values are used in the design of non-standard flanges. In the practical application of standard flanges, they are not specified as the gasket compression stress. The bolt torque table we provide contains relevant data and should be used as a reference.
Formula: M = (W - A2 P) / A1 P
Formula: Y = W / A1
Where:
W = Total tightening force (pounds or newtons)
A2 = Area of the flange hole inside the gasket (square inches or square millimeters)
P = Test pressure (psig or N/mm²)
A1 = Gasket area (square inches or square millimeters)
Proper installation is an important prerequisite for exerting the performance of metal wound gaskets. Before installation, the sealing surface of the chemical pump flange should be cleaned to remove oil, impurities, and scratches, ensuring that the surface roughness does not exceed Ra3.2μm.
During installation, the gasket should be placed stably on the flange sealing surface to avoid offset or distortion. At the same time, the bolt tightening force should be controlled, and the torque should be applied evenly in 2-3 times in a symmetrical order to prevent the gasket from being deformed or damaged due to uneven tightening.
In daily maintenance work, the sealing status of the gasket should be checked every 3-6 months, and close attention should be paid to signs of medium leakage. If the gasket is found to be aged, damaged, or its sealing performance is reduced, it should be replaced in a timely manner to avoid chemical pump operation failures or safety hazards caused by gasket failure.
In summary, the characteristics, selection, sealing coefficient control, installation, and maintenance of metal wound gaskets collectively determine the sealing reliability and operational safety of chemical pumps. Choosing a suitable metal wound gasket is an important guarantee for the long-term stable operation of chemical pumps.
As a professional enterprise focusing on the pump industry, TEFFIKO has been deeply engaged in the field of chemical pumps and supporting sealing components for many years. It has precise control over the material selection and performance adaptation of metal wound gaskets and can provide customized sealing solutions for different chemical working conditions. Whether for technical consultation or product supply, TEFFIKO relies on professional strength and reliable quality. If you need to select high-quality metal wound gaskets and related services for your chemical pumps, please feel free to contact us.
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