Business

Flat flanges Fittings

Welding is the most common method of attachment flanges to the pipes. Therefore professional manufacturers producing stainless steel flanges (as well as the related equipment: tube plates, fitting tools, butt weld fittings, etc.),  e.g. AlexanderComley, provide consultations and training to guarantee proper flanges installation.

Connection of flat flanges requires using special fasteners, which include nuts, bolts, studs and shims. Bolt is a fastener for connecting various structures and machine parts; it is a threaded rod with four or hexagonal head at one end. Nut is a component with a threaded hole, designed for connection of the unit. Shim is placed under the bolt head or nut. Using shims is necessary to enlarge the area of ​​support (in case of insufficient rigidity of the anvil) to align the surface of the support and compensate for the increased diameter of the screw holes. If there is a bias of nuts and screws, it is customary to use the oblique and spherical shims. However, there is a dozen of shims for a variety of technical situations (sealings, springs, locks, etc.).

Hairpin is a metallic rod having threads at both ends. One end is screwed into the first piece and the other piece is pressed against the first one when the nut is screwed.

Securing is covered in a good number of regulatory documents and subjected to a range of requirements. So for flanged joints used fasteners adapted to the special requirements. All the requirements are specific to the use of its products and focus on particular conditions, such as pressure and environmental peculiarities. (more…)

The Role Of Post-combustion In VOC Removal Process

For the purposes of decontamination of organic compounds, oxidative devices that eliminate many technological problems in the field of ecology are overwhelmingly installed in production facilities.

The most common method of voc removal from the exhaust gases is of post-combustion. The main advantages of such modules are the following:

  • no need in large areas for installation
  • relatively low maintenance costs (e.g. no extra investments in building bund walls are needed)
  • post-combustion units can be placed directly at the place of emissions

For this purpose, both classic and modern systems (e.g. regenerative oxidisers aiming at odours elimination, equipped with odour control mechanisms, regenerative oxidisers maintaining high concentrations of volatile organic compounds, and etc.) are typically installed.

In the actual production process is the concentration of pollutants rarely maintains a constant level. In most cases, mean-shift total VOC concentration cannot exceed 50 mg/m3. In these circumstances, the most expedient use of the sorption sites and incineration plants of organic compounds consists in utilising hard surfaces and carrying out the process at low temperatures, when it is possible to use flameless combustion.

In this case, the neutralisation is carried out in several stages. The first one implies low sorption of low-concentrated pollutants, next comes sorbent saturation that follows desorption process at 230 – 270 degrees. The concentrated emission is directed into the catalytic unit  The working body is represented by a block-type catalyst of a honeycomb structure, obtained on the basis of nickel foam or ceramic foam composition Al2O3/SiO2, wherein a palladium compound, heated to 200 degrees is used as the active phase of the catalyst using.

How It Works: Underground Car Parking

Underground parking lots are overwhelmingly designed for offices, shopping malls and high-rise residential buildings. A basic underground car park offers acceptable climate conditions; the more advanced projects include security systems, sound silencing systems and many more. A car park ventilation system is an integral part of any parking lot, integrated in all the underground projects by default.

The minimum temperature in the car park area should not fall below +5°C. Thus, building experts practice integrating systems with air heating mechanisms on board: therefore, the exhaust chambers and recuperators may be installed.

Unlike private garages system, an underground ventilation complex utilises mechanical (artificial) motivation, natural ventilation and mixed forms (mechanical + natural). A solid parking ventilation business integrates the above-mentioned types to guarantee optima ventilation functioning.

Apart from air processing units a decent underground ventilation system includes the elements of smoke removal and even detection. Therefore, the industrial fans and smoke valves are mounted in large ventilation systems.

Ventilation capacity calculation

When designing embedded in the building or detached parking lots of motorized or stationary type, ventilation experts bear in mind the following requirements:

  • Autonomy – the ventilation system of underground parking should be implemented independently from the general ventilation complex of the building.
  • Automation – the supply and exhaust equipment should function automatically (if e.g. exposure limits are exceeded) along the perimeter of the car park.
  • Powerful ventilation, achieved through installation of industrial fans large steel ducts and vents.
  • Smoke removal mechanisms should be set in place.

Ultrasound Cleaning for Dummies

Ultrasound cleaning is highly appreciated for impeccable and quick results; the method has been added to the armory of thousands of enterprises, since it allows eliminating the need in manual labor and cutting down operational expenses.

Modern technology makes high demands on the quality of surfaces cleaning. An insufficient cleaning adversely affects the reliability and durability of mechanical parts, accelerates wear off period, impairs the adhesion of protective and other functional coatings.

A range of classical methods, such as manual and mechanized brushing, chemical/electrochemical degreasing and rinsing doesn’t necessarily provide a satisfactory result, and this is where ultrasonic cleaning stands out from the crowd.

Ultrasound enables the manufacturer to replace expensive and toxic explosive solvents with cheaper and safer alkaline solutions. In some cases, ultrasonic method can eliminate the pollution not amenable to removal by other methods (especially when it comes to complex and bulky objects, tiny parts, the objects with blind holes cleaning and etc.).

Spheres of ultrasonic sound application

Today ultrasonic cleaning processes are used in a wide array of industries: in automobile production for cleaning parts, pipes, wires, removal of corrosion products, grease and grinding compounds elimination, after preservation cleaning, welding and etc.; flushing carburetors, injectors, individual components and entire blocks repairing. Ultrasonic sound has been implanted in manufacturing processes of printing industry for cleaning printing rollers. Thousands of instrumentation manufacturers have also assessed the powerful effect of ultrasonic cleaning, used for printed circuit boards, quartz plates and precision parts washing. And finally, ultrasonic cleaning is used in optics, medical, chemical and pharmaceutical laboratories.

The process of cleaning

The entire process is handled in ultrasound cleaning baths with electrical generators and inverters. The generator provides the required frequency, and the converter receiving an electrical signal from the generator emits ultrasound. Typically, there are two types of transducers used for ultrasonic cleaning – s piezoelectric and magnetostrictive ones. The bath contributes to forming myriads of bubbles (the process of cavitation) that helps to eliminate even extremely tiny 3rd party components from the surface of the object.

Ultrasound cleaning can really help your business grow – stop by Hilsonic website to know how an efficient method can increase productivity and performance of your company.

Scrap Metal & Metallurgy Overview, March 2014

Metallurgical engineering goes through a tough period, as the state of affairs hasn’t changed much since the early 2013. Japan, a solid international scrap metal dealer, has reduced the export of steel scrap in comparison with 2012 by 5.2% to 8.15 million tons, according to the materials of the Ministry of Finance; and the tendency remains actual for the first quarter of 2014.

Another alarming factor is the cost of materials falling in price. Therefore, scrap metal prices in Turkey in February fell to $20 per ton on average, which was one of the reasons for the decline in the regional market of long products. By the end of the February has stabilized, but the majority of consumers, creating reserves for the nearest future, have stopped scrap procurement. Thus, the quotations for scrap obviously will freeze for a few weeks at the current low level.

In East Asia in late February iron ore fell to its lowest level in seven months. Given that China’s steel production has recently experienced a decrease, returning to the same heights in the very foreseeable future seems unlikely. At the same time, the low cost of raw materials in the region contributes to the emergence of negative expectations associated with the cost of finished products.

Some experts believe that the problems of the world steel market can be solved by limiting the volume of supply. But as these problems simply cannot be considered as short-term, but fundamental, it should raise the question of a permanent disabling of overcapacities, especially in China. In fact, the Chinese government sticks to the policy for at least the last decade and even has some success, but the closure of outdated steel mills in the country still does not allow to balance the market.