Oil Seal Research Articles

A study on radial oil seal leakage failure due to viscoelasticity under dynamic eccentricity

Purpose This study aims to investigate the causes of leakage in radial oil seals under dynamic eccentricity, elucidate the influence of operating parameters on leakage failure and develop methods for predicting and preventing such leakage. Design/methodology/approach Based on the principle of cam motion and considering viscoelasticity, develops a motion model of the compression and release of the shaft seal and proposes a method to determine its failure. In addition, this study quantifies the leakage gap and formulates a quantitative calculation model to accurately determine the location and shape parameters of the leakage gap. Findings Leakage gaps predominantly occur during the release phase of the shaft seal. Their presence can be identified by comparing the descending times of the seal and the shaft during this phase. An increase in rotation speed and eccentricity heightens the likelihood of gap formation, with both the dimensions and leakage rate of the gap increasing as these factors escalate. Eccentricity, in particular, has a more pronounced effect on gap formation. Originality/value This study clarifies the failure mechanisms of radial oil seals under dynamic eccentricity and introduces a criterion for identifying leakage gaps, providing valuable theoretical guidance for the design and optimization of radial oil seals. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2024-0192/.

Wear Characteristics of Textured Floating Oil Seal Surfaces: A Simulation and Experimental Study

This study aimed to analyze the effects of surface texture on the wear amount of floating oil seals and how these effects are related to the texture parameters. To achieve this, a finite element model was constructed to simulate the frictional behavior of seal discs under both textured and non-textured conditions. The study focused on a specific set of texture parameters. The texture depth was held constant, while the area density and diameter of the textures were varied. Three different area densities were considered: 10%, 20%, and 30%. Similarly, three different texture diameters were included in the study: 100, 200, and 300 μm. For each combination of area density and diameter, three different texture depths were evaluated: 50, 100, and 150 μm. The results show that compared with the non-texture, the wear loss of the texture is significantly reduced, and the wear loss is reduced by 56.8%. As the texture depth increases, the corresponding increase in wear remains relatively small. In contrast, increasing the texture diameter and area density leads to a more significant increase in wear, indicating that these two parameters have a more significant effect on the wear behavior of the seal. Under the condition of dry friction, the average friction coefficient analysis shows that the texture area density is 30%, the texture diameter is 200 μm, and the minimum value is about 0.602. Under the lubrication condition, the lowest average friction coefficient is about 0.147, the texture area density is 20%, and the texture diameter is 300 μm.

Micro-Groove Optimisation of High-Speed Inner Ring Micro-Grooved Pumping Seal for New Energy Electric Vehicles

Traditional oil seals are insufficient for the high-speed and bi-directional rotation of new energy electric vehicles. Therefore, we developed a Python program focusing on micro-groove pump seals and examined the unexplored non-contact oil–air biphasic internal end-face seals. Real gas effects were described using the virial and Lucas equations. We introduced an oil–air ratio to determine the equivalent density and viscosity of the two-phase fluid in the seal. Furthermore, we solved the compressible steady-state Reynolds equation using the finite difference method. Analysing the seal’s pumping mechanisms and the effects of operating parameters on sealing performance, we assessed 17 types of hydrodynamic grooves. The results demonstrate that inverse fir tree-like grooves perform well under typical sealing conditions. Under the conditions given in this study, the pumping rate of the optimal groove type compared to other groove types even reached 633.54%. In the oil–air biphasic state, the micro-groove pump seal exerts significant dynamic pressure on the sealing surface. Seal opening force increases with rotational velocity, oil–air ratio, and inlet pressure but decreases with temperature. The pumping rate first increases and then decreases with rotational velocity, increases with oil–air ratio and temperature, and then decreases with inlet pressure. Some special working points require consideration in sealing design. Our results provide insights into designing micro-grooved pumping seals for new energy electric vehicles.

Characteristics of packing gland seals in hydraulic systems of quarry excavators and results of comparative analysis of experimental tests

The efficiency of quarry hydraulic excavators will depend on several factors, namely the climatic conditions of the area where hydraulic excavators are used, the degree of air pollution (pollination), the performance of the structural parts of the excavator, the reliability of the hydraulic system, the performance and cleanliness of the hydraulic working fluid. In this area, research was carried out on the performance of seals used in the hydraulic system of quarry excavators. The article presents the results of experimental tests of the existing type of oil seal a and b, as well as the proposed oil seal type c, shown in Fig. 1.

Effects of Carbon Black on Mechanical Properties and Oil Resistance of Liquid Silicone Rubber.

Liquid silicone rubber (LSR) garners attention across a diverse range of industries owing to its commendable fluidity and heat resistance. Nonetheless, its mechanical strength and oil resistance fall short compared to other rubbers, necessitating enhancement through the incorporation of a suitable filler. This research focuses on reinforcing LSR using carbon black (CB) particles as a filler, evaluating the mechanical properties and oil resistance of neat LSR, and LSR containing up to 3 wt% of CB filler. CB was added in powder form to investigate its effect on LSR. When LSR was impregnated with oil, the deterioration of rubber was noticeably observed under high-temperature conditions compared to room-temperature conditions. Consequently, the mechanical properties and oil resistance, excluding the permanent compression reduction rate, tended to increase as the filling content of CB increased compared to the unfilled state. Notably, in the specimen with 2 wt% CB filler, the tensile modulus increased significantly by 48% and the deterioration rate was reduced by about 50% under accelerated deterioration conditions. Additionally, the swelling rate in oil decreased by around 14%. This validates a notable improvement in both mechanical properties and oil resistance. Based on the identified mechanism for properties enhancement in this study, CB/LSR composite is expected to have a wide range of applications in fields such as gaskets, oil seals, and flexible sensors.

Carrying Capacity of Spherical Hydrostatic Bearings including Elastic Deformation

This paper presents a theoretical model for calculating the carrying capacity of spherical hydrostatic bearings, including the deduction and solution of differential equations for fluid flow in the oil seal and the generation of bearing characteristic parameters. An example is used to verify the accuracy of the proposed calculation model. Additionally, the influence of dynamic pressure on the bearing capacity is investigated under various speed conditions. The results demonstrate that as the minimum width of the oil gap decreases, the maximum dynamic pressure increases non-linearly. Furthermore, the maximum dynamic pressure increases with higher rotational speeds, particularly when the width is smaller.

Non-destructive Oil Seal Defect Detection Based on Machine Vision

Non-destructive Oil Seal Defect Detection Based on Machine Vision

Numerical Simulation Analysis and Experimental Verification of Pressure-resistant Self-compensating Oil Seal

The glyd ring of the transmission device is prone to wear and leakage, which causes the sealing failure to cause the failure of the transmission device. Therefore, a pressure-resistant self-compensating oil seal is proposed in this research. The influence of working conditions such as pressure and rotational speed on its temperature is studied by the numerical simulation method. An experiment bench for oil seals is constructed and utilized to validate the simulation findings. The above research results can ensure the safe and stable operation of the transmission device seal for a long period. In this research, the effect of working conditions such as pressure and rotational speed on its temperature of the glyd ring and the pressure-resistant self-compensating oil seal is compared, and it is verified by the experiment results. The research results show that with the increase of pressure and rotational speed, the temperature of the two seals also increases. Under the same condition, the temperature of the pressure-resistant self-compensating oil seal is significantly lower than that of the glyd ring. The temperature rise of the pressure-resistant self-compensating oil seal can be reduced by about 27 % compared with the glyd ring.

ВЛИЯНИЕ ГИДРОЛИЗАТА КОЛЛАГЕНА НА КИНЕТИКУ ВУЛКАНИЗАЦИИ И ПЛОТНОСТЬ СШИВАНИЯ РЕЗИН НА ОСНОВЕ БУТАДИЕН-НИТРИЛЬНОГО КАУЧУКА БНКС-18

The effect of collagen hydrolysate (CH) obtained from the swim bladder of northern fish species on the set of operational properties of elastomers based on BNKS-18 nitrile butadiene rubber with acrylonitrile content of 18 wt.% was studied. The vulcanization kinetics of elastomeric blends were determined on a D-RPA 3000 rotorlessrheometer (MonTech, Germany). Tensile strength and elastic properties of vulcanizates were determined on an Autograph AGS-JSTD testing machine (Shimadzu, Japan). Frost resistance was evaluated by the value of frost resistance coefficient according to elastic rebound after compression at -20, -30, -40, -50 °C. The density of the vulcanization network of the studied elastomers was determined according to the Flory-Rener equation by the method of equilibrium swelling of vulcanizates in chloroform. The analysis of vulcanization kinetics showed that the introduction of collagen hydrolysate obtained by us into the composition of BNKS-18 based elastomer increased the minimum torque. That is, the viscosity of the studied elastomers increased before the start of the main vulcanization process. As demonstrated in this study, CH significantly affects the crosslinking density of elastomer. Introduction of CH in the composition of elastomers leads to the formation of a sufficiently dense and strong vulcanization network. This is apparently associated with the fact that CH fragments interact with the ingredients of the vulcanizing system and the rubber macromolecules, participating in the structuring of the material. It was found that the introduction of CH increased modulus at 100% elongation and tensile strength, while elongation at break decreased. The maximum value of tensile strength corresponds to the introduction of 3phr of CH and amounts to 16.9 MPa, which is 37% higher in comparison with control elastomers without CH. It was shown that the increase of crosslink density of vulcanization network of the obtained elastomers was accompanied by increase of frost resistance coefficient at -30 and -40 °C. The field of application of the developed materials is manufacturing of rubber seals, cuffs, oil seals, gaskets designed for the Far North and the Arctic equipment.

Optimization of Basket Oven Oil Seal Design For Quality, Productivity and Material Handling

In the oil seal production process, one of them is the post-cure oven process as a heat treatment to engineer the rubber material so that it has resistance to friction and has high heat resistance. The post-cure oven process itself uses equipment in the form of an oven basket made of heat-resistant steel material to place the oil seal. However, the Basket oven itself has a maximum limit for placing the oil seal in the oven, so calculations are needed to find the optimization value to find out the maximum value obtained so as to increase work productivity. From the problems found, the existing oven baskets were unable to accommodate 1,442 pcs/lot of products, but were only able to accommodate 1,344 pcs of products. so it is necessary to design a new basket oven to get the optimal value so that the basket oven can accommodate as many as 1,442 pcs/lot of products. From the research results it is known that to save material the most optimum cutting value is if the value of x = 8.5. Meanwhile, to get the maximum volume value, it is cut with a value of x = 11. By using the new oven basket, the product volume that can be accommodated is 1,568 pcs when compared to the use of the old basket which was previously able to accommodate 1,344 pcs of product. The use of a new basket oven can increase basket volume by 16.7%.

Deformation mechanism and dimension optimization methods of PTFE oil seals for shafts in a wide temperature range cycle

PurposeThis paper aims to study the deformation mechanism of polytetrafluoroethylene (PTFE) oil seal under a wide temperature range cycle.Design/methodology/approachThis study categorizes the oil seal operation into three states: assembly, heating-up and cooling. The deformation equation for the oil seal is developed for each state, considering the continuity between them. The investigation of the oil seal’s deformation trends and mechanisms is performed using the ANSYS Workbench.FindingsThe assembling process results in a radial shrinkage of the skeleton, causing the centroid to move toward the axis. During heating-up, the outer diameter of the skeleton slightly expands, whereas the inner diameter sharply contracts toward the axis, leading to a further reduction in the centroid’s distance from the axis. Upon cooling, both the inner and outer diameters continue to contract toward the axis, causing the centroid to persist in its movement toward the axis. Consequently, after undergoing a heating-up and cooling cycle ranging from 20°C to 180°C, the outer diameter of the PTFE oil seal reduces by 0.92 mm from its original deformation, ensuring minimal contact between the skeleton and housing. As a result of the reduced static friction torque at the skeleton, the oil seal rotates along the shaft.Originality/valueThe deformation mechanism of PTFE oil seals under a wide temperature range cycle was investigated, aiming to address the concerns related to the rotation along the shaft and leakage.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2023-0142/

Investigation of the transport and metabolic patterns of oil-displacing bacterium FY-07-G in the microcosm model using X-CT technology.

Microbially Enhanced Oil Recovery (MEOR) is dedicated to enhancing oil recovery by harnessing microbial metabolic activities and their byproducts within reservoir rocks and fluids. Therefore, the investigation of microbial mobility and their extensive distribution within crude oil is of paramount importance in MEOR. While microscale models have been valuable for studying bacterial strain behavior in reservoirs, they are typically limited to 2D representations of porous media, making them inadequate for simulating actual reservoir conditions. Consequently, there is a critical need for 3D models and dependable visualization methods to observe bacterial transport and metabolism within these complex reservoir environments. Bacterial cellulose (bc) is a water-insoluble polysaccharide produced by bacteria that exhibits biocompatibility and biodegradability. It holds significant potential for applications in the field of MEOR as an effective means for selective plugging and spill prevention during oil displacement processes. Conditionally cellulose-producing strain, FY-07-G, with green fluorescent labeling, was engineered for enhanced oil recovery. 3D micro-visualization model was constructed to directly observe the metabolic activities of the target bacterial strain within porous media and to assess the plugging interactions between cellulose and the medium. Additionally, X-ray computed tomography (X-CT) technology was employed for a comprehensive analysis of the transport patterns of the target strain in oil reservoirs with varying permeabilities. The results indicated that FY-07-G, as a microorganism employing biopolymer-based plugging principles to enhance oil recovery, selectively targets and seals regions characterized by lower permeability and smaller pore spaces. This work provided valuable insights into the transport and metabolic behavior of MEOR strains and tackled the limitation of 2D models in faithfully replicating oil reservoir conditions, offering essential theoretical guidance and insights for the further application of oil-displacing bacterial strains in MEOR processes.

The lip motion trajectory of eccentric oil seal considering material viscoelasticity

PurposeThis paper aims to study the motion trajectory of the oil seal for shaft in eccentric state and derive equation of lip motion trajectory.Design/methodology/approachThis paper analyzes the force during the motion of the eccentric lip by considering the material viscoelasticity, and a cam-plate mechanism is established as an equivalent model for the motion between the shaft and the lip; according to this, the equation of lip motion trajectory is derived.FindingsThe trajectory of the lip lags that of the shaft in the eccentric state because the viscoelasticity-affected lip recovery velocity is lower than the shaft recovery speed. The lip trajectory enters the lag phase earlier and the lag phase’s duration is longer with the increase of the eccentricity and rotational speed, because the deviation of the recovery velocities between the lip and the shaft will be exacerbated.Originality/valueInnovatively, by considering the viscoelasticity of the material, the cam-plate mechanism is used to equivalent the motion of the shaft-lip to derive the equation for the radial motion trajectory of the eccentric lip. The regularity of lip motion is the key to determining the performance of oil seals, and the eccentric lip trajectory research method revealed in this paper provides a research basis for the performance research and optimization of eccentric oil seals.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2023-0161/

The Extraction of Keratin from Human Hair Waste for Copolymerization with Nitrile Butadiene Rubber

Human hair contains a rich source of a fibrous protein called α-keratin. Due to keratin’s intrinsic ability to self-assemble and polymerize into porous, fibrous scaffolds and reproducible architecture, dimensionality, and porosity, its biomedical application has become widespread. However, the extraction of keratin from hair proves challenging and ineffective, hindered by its disulfide bonds. The purpose of this research is to explore a relatively simple procedure to extract keratin from hair waste and fuse it with NBR in hopes of enhancing its mechanical properties and improving its biodegradation. Keratin’s non-covalent bonds were broken using mechanical disruption by a grinder. Hair keratin is then extracted via solubilization by utilizing sodium chloride. The alkaline hydrolysis method, a simple, cheap, and time-affordable method, is explored with different concentrations of NaOH. Then, the recovered keratin from each solution is mixed with dissolved NBR (Nitrile Butadiene Rubber), a well-known rubber used for a variety of purposes, such as the construction of hoses, belts, sealing parts, oil seals, oil wells, and shoe soles. A series of tests on the mechanical properties of the keratin-filled NBR samples were then tested, such as tensile strength, elongation at break, hardness, and elasticity. 10g NaOH/100mL solution yielded the highest amount of keratin, with the addition of keratin from the same solution in NBR enhancing the mechanical properties the most, although only modest. Additionally, the inclusion of keratin in NBR improves its biodegradability.

Temperature-dependent growth kinetic and crystallization behavior of the supercooled erythritol as a phase change material in long-term heat storage

Along with the development of long-term heat storage, the utilization of sugar alcohol with large supercooling has been valued in recent years. However, the heat release rate is not easy to control, and the supercooling would be easily influenced by accident factors. Different from the research of directly developing the composites to control the heat release rate and keep stable supercooling, this paper investigated the temperature-dependence crystal growth of erythritol coupled with diffusion-limited kinetics to find the mechanism for better understanding the utilization of supercooling upon different heat needs. The mean crystal growth rate (vm) on supercooled erythritol and the thermodynamic parameters were characterized experimentally. A nucleation factor J* was proposed to improve the modern Wilson-Frenkel equation, which enables a more accurate reflection of the nucleation effect on the practical vm. The sensitivity analysis indicates that the diffusion coefficient (D) and liquid–solid interfacial free energy (IFE1) have a great impact on vm, with 62% and 37% correlations. To verify this result, 0.1 wt% PVA was added to erythritol, which resulted in a significant reduction in the vm maximum by 33.3%. An oil seal was added to reduce the liquid–air interfacial free energy (IFE2) of erythritol, which significantly extended the supercooling duration to 5 days with a 12% cumulative crystallization fraction. Moreover, the crystal morphology analysis revealed that the maximum growth rate had preferred orientations of (211), the largest grain boundary size of 9.2 mm, and exhibited three-dimensional growth. This work can aid in the creation of a dependable heat release model for sugar alcohols in long-term heat storage systems.

Quantifying the impact of heat in support seal configuration for aero engines

AbstractLeakage, deformations, power loss, heat generation in the support seal system and other issues are typical when support seals are developed. The design of the support seal system has progressively evolved over recent decades as part of an ongoing effort to provide effective cooling for the aero engine secondary air system. In particular, oil heat management in the oil chamber has strict requirements, which limit the heat generation of the support seal system. The potential of supporting seal research with an oil system is investigated in this work. The combination of the CFD/FEA method and quantifying the heat generation entering the oil chamber allows for improvements not just to the individual buffer air seal unit, but the oil seal together. The analysis relies on the combination of quantifying heat generation entering the oil chamber to provide a mutual influence of neighbouring labyrinth seals. The mutual influence requires further analysis, considering the thermal deformation of the rotor/stator to provide further accurate geometry parameters in preliminary seal designs. The experimental test was conducted to verify the preliminary CFD-FEA loosely coupled analysis result, which reveals that in a turbine support seal system, the radius of the buffer air seal has a significant influence on the leakage flow rate and power loss of the oil seal, which should take into account the integral influence of the pressure difference of the oil seal caused by the radius change of the buffer air seal and the running clearance of the oil seal.

Scheduling Preventive Maintenance to Determine Maintenance Actions on Screw Press Machine

PT. PAS is a company engaged in the manufacturing industry, is a company that manages palm oil into Crude Palm Oil (CPO) and Palm Kernel (PK) with a capacity of 30 tons/hour. The method used in this study is Reliability Centered Maintenance (RCM). This method can determine the actions of preventive maintenance activities on each component of the screw press machine. This study aims to provide proposals for scheduling preventive Maintenance of screw press machines using the Reliability Centered Maintenance (RCM) approach and determine appropriate maintenance actions in damage prevention. Based on the results of the research conducted, it can be concluded that in the Reliability Centered Maintenance (RCM) approach, it is known that five types of damage are a priority for repair. The types of damage included in the repair priority are worm screws, extension shafts, bearings, press cages, and oil seals. The proposed maintenance time for each critical component is a worm screw component maintenance time interval of 307.84 hours and a changeover schedule every 2035.3 hours. Component extension shaft maintenance time interval 279.5 hours, changeover schedule every 1824.5 hours. Bearing components have a maintenance time interval of 300.2 hours and a changeover schedule of every 1492.5 hours. Oil seal components maintenance time interval 286.1 hours, changeover schedule every 2769.9 hours. Press cage components maintenance time interval 250.72 hours, changeover schedule every 3277.8 hours. Actions are taken in the form of direct prevention of the source of component damage based on the time or age of the component

Study on the Influencing Factors of the Response Characteristics of the Slide Valve-Type Direct-Acting Relief Valve with External Orifice

The slide valve-type direct-acting relief valve with external orifice (SVTDARVWEO) is widely used in hydraulic systems, and its response characteristics are influenced by key factors. It is of great significance to carry out research on the influencing factors of the response characteristics of the SVTDARVWEO. The working principle of the SVTDARVWEO is analyzed in the present study. The simulation model of the SVTDARVWEO is established using AMESim. The influence of the orifice diameter, viscosity coefficient, valve element mass, spring stiffness, oil seal length, and valve element diameter on the response characteristics of the SVTDARVWEO is studied. The results show that: (1) The smaller the orifice diameter is, the smaller the oscillation frequency, amplitude and maximum overshoot of pressure, flowrate, displacement and velocity are. (2) When the viscosity coefficient is 50 N/(m/s), 55 N/(m/s) and 60 N/(m/s), the pressure, flowrate, displacement and velocity oscillate periodically, but the amplitude of the oscillation decreases gradually, and the oscillation frequency is 250 Hz. When the viscosity coefficient is 60 N/(m/s), the pressure, flowrate, displacement and velocity will reach their respective stable values earlier. (3) When the valve element mass is 0.01 kg, 0.015 kg and 0.02 kg, the pressure, flowrate, displacement and velocity oscillate periodically, but the amplitude of oscillation decreases gradually. When the valve element mass is 0.01 kg, the pressure, flowrate, displacement and velocity will reach the stable value earlier. (4) The smaller the spring stiffness is, the greater the maximum overshoot of pressure, flowrate, displacement and velocity is, and the higher the number of oscillations to reach the stable value are, in addition to more time being required. (5) With the increase in oil seal length, the maximum overshoot of pressure and velocity, stability value of displacement also increase correspondingly. (6) With the increase in the valve element diameter, the stable value of pressure decreases, and the oscillation frequency of pressure, flowrate, displacement and velocity increase, but the oscillation amplitude decreases.

Restoration of a tractor part by the method of electric arc metallization

Relevance. Tractors are distinguished by long inter-service ranges and easy maintenance. But if the tractor components are not serviced in a timely manner (oil change, filters, and so on), the resulting contamination will begin to damage the parts, and increased friction will contribute to their wear and overheating. Since there is currently an acute shortage of original spare parts and their prices are quite high, the development of technological solutions for the restoration of worn-out seats of tractor parts is relevant. One of the coating methods, namely electric arc spraying, can solve this problem. The purpose of the study: using the example of the drive axis of a cylindrical straight tooth gear of a “John Deere” tractor, develop a technology for restoring a worn-out seat by electric arc spraying for the installation of a bearing or an oil seal. Methods. The brand of the axis material corresponding to the Russian analogue has been determined. The hardness of the axis base was measured with a TK-2M hardness tester. Preliminary mechanical treatment of the restored surface has been carried out. Additionally, jet-corundum treatment of the worn surface was carried out. The technology of electric arc spraying has been applied to obtain the necessary coating. Turning of the restored surface was performed until the nominal diameter of the axle seat was obtained. Results. The technology of restoration of the axle seat by supersonic electric arc spraying has been developed. The expediency and necessity of preliminary mechanical action on the seat, consisting in threading and jet-corundum processing, before the process of supersonic electric arc spraying are established. The results of the study showed the effectiveness of the electric arc spraying method for restoring the worn-out seat of the drive axis of a cylindrical straight tooth gear in tractors. The cost of restoring one worn-out axle seat was 3,000 rubles, which is more than 10 times cheaper than the original spare part. At the same time, all the mechanical properties of the part have been preserved. It is recommended to use the method of electric arc spraying to restore the worn-out seat of the axles of all imported agricultural machines.

Гистологические особенности ряда органов куньих и их патологические изменения при неэкссудативном перитоните

The article presents the histological features of some organs of weasel family. Also described the pathological changes during nonexudative form of peritonitis of weasel family. The studies were carried out at the Department of General Pathology named after V. M. Koropov of Moscow State Academy of Veterinary Medicine and Biotechnology – MBA named after K. I. Scriabin. The objects of investigation were predatory animals weasel family both healthy and with sings of peritonitis. There are 21 sables, 11 mink cellular content and 15 domestic ferrets. In the study complex methodological approach was used, including classical anatomical preparation, post mortem and histological examination. It has been established, that abdominal wall weasel has three puffs. There are muscle layer, a layer of dense connective tissue and serous membrane. The muscle layer is showing striated muscle tissue with endomysium layers. In the endomysia of muscle febers of abdominal wall of the weasel there are mast cell. Serous membrane is represented by mesothelium, which has typical structure of single – layered squamous epithelium. Large oil seal showing of fat cells with connective tissue layers, including lymphatic capillaries, vessels and nerve trunks. In a large oil seal single mast cell concentrated around the vessels and in the connective tissue of the omentum observed clusters of mast cells. Essential features of the structural organization of the stomach walls and intestinal canal are not found, but revealed a large number of goblet cells in the mucous membrane of the colon and small intestine and mycocytes in mucous membrane of stomach. The liver has a typical structure, lobilarity is weakly expressed. Liver beams are shortned, hepatocytes fit snugly together, sinusoid capillaries are broad. In morphological organization of organs of immune defense weasel significant features are not found. In the spleen was observed a lot of white pulp. In the cortical layer of lymph node was founded a large number of follicles. Thymus has sings age involution. Kidney and lungs weasel has not significant features. Predatory animals weasel family had predominantly nonexudative form of peritonitis. Under the nonexudative peritonitis form was observed sings of acute inflammation of many organs like as system inflammatory response syndrom.