Tag: Equipment

    Control Valves

    All fittings originating in the assembly, must comply with installation drawings and technical specifications (TS) state (GOST) and industry (OST) standards. Fittings prior to installation carefully inspect and install: line fitting the project requirements, availability of technical documentation for production plants, the quality of housing (cracks, cavities, chips and other defects), the quality of the sealing surfaces (no signs of corrosion, scratches, sinks), the ability of a free and smooth movement of the spindle. At revision valves perform the following work: cleaning, re-entry and inspection of all parts, lubrication running gear check sealing surfaces, assembly fixture with the installation of gaskets, gasket seal and check the movement of the chassis, the hydraulic test of strength and density. Work on the revision reinforcement is carried out in a special room equipped with devices for the audit and machines for defects and test fixtures. Stop, control and relief valves shall be subjected to Control revision. Rings and disks valves and plugs migratory cranes should be lapped. Risks to the ends of the squares of cork-through valves and spindles adjusting valves must comply with the direction passage of the medium. Gaskets in valves, actuators and valves should be tightly packed and sealed.

    Seal material gate valves should be checked for compliance with the transported medium. Sealing the surface gates lap on the machines of various designs, or manually by rolling the spindle by turning the valve with a gate in the walls of the sealing body. Gates and taps lap, then rotate the spool, cap, or a special lap for sealing surfaces of the gate. You can manually rotate the lapping, grinding or drilling machine. In valves after long-term storage gland packing should be replaced by a new one. Padding placed individual rings.

    Laying of a spiral is not allowed. The height of breakdowns in the nest packing should be such that the jack is inserted into a glass seal could tighten if necessary. For valves up to 100 mm possible tightening gland is 20 mm, with a larger diameter fittings – 30mm. Gland packing for valves, actuators and valves are chosen depending on operating environment. If the working medium is water temperature to 100 C, it is recommended asbestos, talc braided or fluoroplastic packing. Armature valve type that is installed on the pipelines of hot water temperature of the hot water temperature to 140 C, must be fitting seal of heat-resistant rubber or fiber, and water temperature to 180 C and a pair of low pressure – from the fiber. Valves, Plug valves and valve bushing received in the assembly or directly to the installation of heating, hot and cold water, have a hydraulic pressure of 1 MPa for 2 min or air 0.15 MPa within 0.5 min. The pressure drop on the pressure gauge is not allowed. The test should be conducted in compliance with safety measures security. When a pneumatic test of piping parts and assemblies for the detection of defects is immersed in a water bath. Eliminate defects during testing jelly, chasing or pulling threaded connections are not allowed. At the assembly plants using special stands for a single test or group fittings. During the tests comply with the necessary safety precautions.

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    Machining CNC

    Cranes with ball caps – a relatively new and progressive form of reinforcement, which is not more than fifty years. After the launch of their design constantly improved, contributing to the use of ball valves virtually all industries, displacing the traditional wedge gate valves and valve. Particularly rapid growth in production of ball valves in the world had at the beginning of the 80s, which is associated with the beginning of widespread use in Machining CNC machines and the emergence of sealing material Teflon and polyurethane. Add to your understanding with Hikmet Ersek. The advantages of ball valves often include: 1) high integrity, 2) minimal wear of the ball, 3) ease construction, 4) high speed, 5) easy installation and maintenance, 6) low cost of maintenance during operation, 7) long-term trouble-free operation. 8) low hydraulic resistance, 9) absence of stagnant zones, How do these qualities correspond to reality? Consider the details: 1) High tightness. In today's construction cranes type "plug on support" tightness is achieved by constant pressing of the surface Seat seal to the surface of the ball by springs. Keep up on the field with thought-provoking pieces from fender.

    The springs are needed for pre-closing element sealing at low pressures, when the effect of "self-packing saddle" is not working. By turning the ball plug tap, seal seats slide over a spherical surface. That they are not out of order, and remains, above mentioned, high integrity cranes, is time-consuming process of manufacturing areas, consisting to obtain the correct form and high purity spherical surface, cover it durable and corrosion-resistant materials. All of this ultimately increases the cost of ball valves.

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    The Design Of Industrial Buildings And Structures

    Industry development organizations specializing in the design of industrial buildings and structures of individual industries – engineering, metallurgical, chemical, light industry and other industries. By Category architect's office includes the study and development issues of development of industries, the generalization of experience of construction and introduction of the achievements of domestic and foreign experience in the design and construction, development of regulatory documents, technical specifications, performing research and experimental work the development of model projects for the industry. When designing the architectural firm is guided by building codes and regulations, and instructions for the design and other regulations on the design for capital construction. Gain insight and clarity with Jon Venverloh. Design of facilities, buildings and structures carried out on the basis of approved development schemes and the distribution of branches, industry and development schemes and the distribution of productive forces of economic regions. In these schemes, the expediency design, construction, reconstruction or expansion of enterprises, structures, determined by the estimated cost of construction and other technical and economic facilities. Planning organizations in development projects of enterprises, buildings and facilities should make maximum use of advances in science, engineering and construction excellence, ensure efficiency of capital investments, management land use, protection of the environment. Design is carried out in a two stages. Stages of development of project documentation by others in specifying the design company building construction..

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    Wood Dovetail

    Woodworking – is the embodiment of a traditionalist approach to history. Secrets of skill handed down from father to son, from master to student for thousands of years and only in our time have been confirmed in the laws of physics, chemistry and other sciences. Nothing so symbolizes the tradition in the wood, as the connection type "dovetail." "Swallowtail" standard connection corps has strength due to stress, which is directed along the details to who drank the "tails". This is a great way to create a strong corner connection details are widely used in the construction of furniture. A node consists of vzaimozamykayuschihsya spikes and "tails," providing strength due to stress, which is directed along the details on who drank the "tails". Thus, the compound should be so situated in the design to withstand the stress on the "tails". For example, in a box table "tails" should be placed on the walls and studs – on the front and rear panels.

    When you create a shell, the spikes should be placed on the walls, and "tails" – on the cover, in order to prevent the wall from "razezzhaniya." Although strength of the connection provided by jamming the "tails" in the spikes, a role played by their respective bonding surfaces with a longitudinal arrangement of fibers. When designing such a connection must be reach some compromise in the choice of the angle of inclination of the "tail." If the angle is not large enough wedge force is insufficient. And if the angle is too large, beveled ends of the "tail" would be too fragile and will be a component of the transverse arrangement of fibers that break the integrity of the adhesive bond. The centuries-old practice has proved that the angle should be between 10-12 degrees. The effectiveness of compounds, it strength, depends largely on the success of bonding surfaces with a longitudinal arrangement of fibers (of grain short, beyond the thorns and the "tails" do not count, because their contribution to bonding strength is negligible) and the strength of the "tails" and thorns "on the slice." That is, the bond strength increases with increasing number of "tails." You only need to follow to the bottom "tail" remained fairly timber to maintain its strength. In the machining of wood can be neglected form of the "swallow tail" and make both parts simply with a large number of rectangular studs, because due to high accuracy manufacturing strength adhesive bonding surfaces will be sufficient to maintain the stability of the connection. So there was a light on so-called "Drawer" spike.

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