Knife Gate Valve 1 tanker loading system with bin dischargers

Lump Breaker 1

screw conveyor assembly details

 

In addition to the custom designed solutions that Bulk Technik offers, we have developed a wide range of standard products and equipment that are used for storing and handling bulk granular powders. Our equipment categories include:

  • Pneumatic conveying accessories - long radius bends, barrel bends, drop boxes, feeding tees, venturis, Storz quick-lock couplings, pinch valves
  • Bulk storage silos and portable silos
  • Silo discharge equipment - mechanical vibrating bin dischargers, aeration systems, pneumatic hammers, knife gate valves, rod gates, telescopic tanker loading spouts
  • Silo safety devices - over and under pressure safety flaps, explosion panels
  • Silo dust handling systems and filter housings
  • Screw conveyors - tube and trough type
  • Dosing screw feeders
  • Lime slaking equipment
  • Lump breakers
  • Air slide conveyors
  • Rotary screens
  • Bulk bag systems - filling and de-bagging, suspension beams
  • Valves - cone valves, knife gate valves and pinch valves

 

The above products are available in standard sizes, however, Bulk Technik will custom design, manufacture and supply these items to our client’s specific needs and requirements.

In addition to the equipment designed and supplied by Bulk Technik, we also have the agency for supplying AKO pinch valves as well as Storz couplings.

   
The AKO pinch valves are manufactured in Germany and are directly imported by Bulk Technik. These high quality pinch valves can be supplied with aluminium, steel, stainless steel and even a number of different plastic housings together with a wide variety of internal sleeves to suit the product being handled, from abrasive to acidic. The pinch valves are supplied with both SABS and ANSI drilling while sizes below 50 NB are also offered with threaded ends.
   
The Storz couplings are also of German origin and we can supply these in an aluminium alloy, copper alloy and stainless steel. These quick-lock Storz couplings are supplied with male / female threads or hose couplings with sizes ranging from 25 mm to 250 mm.
   

 

AERATION PADS

 

Aeration pads are placed into the discharge cones of silos and tanks to assist with product flow out of the silo. They are especially effective with granular, dry, free flowing material. An alternative solution is the use of airbrators, these simultaneously aerate and vibrate the material inside of a silo or hopper.

 

 

AIR SLIDE CONVEYORS

 

Air slide conveyors are used to economically gravity feed powders such as cement, fly ash and lime without using any moving parts. Essentially the powder is fluidised and then gravity flows within the housing that has a slight decline of between 6 to 8°. Air slide conveyors are suitable for capacities as low as 2 to 3 t/h or exceeding 300 t/h.

 

 

 

BIN DISCHARGERS

 

The vibrating bin dischargers are fitted to the discharge cone of silos or hoppers and consist of a fixed upper part that is attached the the silo and a lower cone that is suspended by hanger rods allowing it to move horizontally. The vibrating motion is created by a vibrating motor that it bolted to the lower section of the bin discharger. Both mild steel and stainless steel bin discharges can be supplied for silos with a volumetric capacity of less than 5 m3 to over 200 m3.

 

 

BULK BAG SUSPENSION BEAMS

 

The bulk bag suspension beams  are used for lifting standard sized bulk bags with a crane or other lifting device. The suspension beams are load tested and certified and have been designed for safe working loads ranging from 1000 to 2000 kg.

 

 

BULK BAG SYSTEMS

 

Bulk Technik can supply bulk bag systems for filling or unloading bulk bags. Essentially these consists of a storage hopper, which often is placed onto load cells, into which the contents of the bag is filled. A discharge feeding system such as a screw conveyor or pneumatic conveying system will then convey the product from the hopper into another area of the plant.

 

Conversely, product is filled into a hopper which then gravity feeds into the bulk bag until a predetermined mass is reached. The bulk bag is then removed and the next one can be filled.

 

 

CONE VALVE

 

The cone valve is the ideal material inlet valve for pressure vessels. It consists of a cone which is lowered to allow product to enter into a vessel. A pneumatic cylinder raises the cone up to form an air-tight seal. When the pressure vessel becomes pressurised, the cone valve is pushed harder against the seal by the internal vessel, hence not requiring a higher pressure differential as is common with other types of valves. The cone valves have been designed for to ensure trouble free operation even when used with abrasive materials.

 

 

DOSING FEEDERS

 

The Bulk Technik designed dosing feeder is suitable for micro dosing of granular products. The dosing feeder essentially consists of a tubular screw flight that is driven by a geared motor and feeds product at the required rate into the discharge adaptor. A mechanical agitator arm, turns in the feeder housing above, thereby gently mixing the powder to ensure that it flows freely into the feed screw and thereby providing a constant product flow for accurate dosing. The agitator arm is driven via a gear wheel that is coupled to the screw feeder.

 

Both the screw flight and the agitator arm have stuffing box-type seals and are mounted with outboard plummer block bearings. The dosing feeders are manufactured from mild steel components, however, we can offer an option where all wetted surfaces are manufactured from stainless steel.

 

The geared motor can be supplied with a VSD so that the feed rate can be varied for a specific conveying range. The dosing feeders are usually supplied with custom sized screw flights as well as a geared motor selected to provide the correct dosing capacity. Typically these vary from 10 kg/h up to 500 kg/h, however, other feed rates can be custom designed.

 

 

DROP BOXES

 

When conveying product pneumatically into a tank or silo, the product needs to fall into the tank and separate from the conveying air in which it had been suspended. The Bulk Technik drop box is fitted onto a nozzle in the silo roof, allowing the powder to fall down and the conveying air extracted via a dust handling system.

 

The drop boxes are supplied in sizes ranging from 150 NB to 300 NB and they are flanged according to SABS 1123-1000/3. Other flanges can be provided on request. For very abrasive materials we can also supply drop boxes that are ceramic lined.

 

 

EXPLOSION PANELS

 

When certain products such as flour are mixed with the oxygen in air, they become a highly flammable and explosive mixture. A spark from static build-up could ignite this lethal mixture resulting in a catastrophic explosion with total destruction of the silo and buildings or other structures in its vicinity. A normal over pressure device is insufficient to vent the internal pressure build-up that results from the combustion.

 

The only effective way of preventing damage to the silo and surrounds is by providing a large venting area through which the pressure can escape. Bulk Technik has designed special explosion panels that are installed on the silo roof. These panels make use of a shear pin, which breaks when the internal silo pressure exceeds approximately 25 kPa. Furthermore the explosion panels have an air-tight seal, preventing ingress of dirt from the outside.

 

In the event that an over pressure is reached within the silo, the shear pin will break and the panel will open, allowing the air to escape. Unlike a bursting disk, which is destroyed and has to be replaced each time an over pressure is reached, the only part that requires replacing is a shear pin. The Bulk Technik explosion panel is therefore a very cost effective way of maintaining a safe working environment as well as complying to safety regulations

 

 

FEEDING TEES

 

The Bulk Technik pneumatic conveying feeding tees are used to feed fine powder into a pneumatic conveying line. The feeding tees have been designed so that there is a small pressure drop across the conveying direction which at the same time results in reduced turbulence. The turbulence, combined with an abrasive product, results in excessive wear and ultimately failure of the part. Although Bulk Technik’s feeding tees have been optimised to minimise wear, it can not be prevented, therefore special feeding tees have been developed with reinforcing, liner plates as well as ceramic lining.

 

The feeding tees are supplied standard with SABS 1123-1000/3 flanges in the conveying direction, however, other flanges can also be supplied on request. Furthermore, our range of feeding tees can be supplied both with square or circular inlet flanges which can be custom made to match the corresponding flange of the material feeder. The feeding tees are supplied both in mild steel as well as stainless steel.

 

 

FILTERS & FILTER HOUSINGS

 

Bulk Technik can provide a number of different air filtration systems for de-dusting the air when conveying product pneumatically into silos. The most simple filter is the sock type filter that is commonly used in the cement industry, while the more advanced filters operate with air jets that pulse the filter bags are regular intervals.

 

The sock type silo filter consists of a mild steel filter housing that allows the filtered air to escape, but prevents any ingress of rain into the silo. A conical filter bag is fitted to a mild steel cage, which in turn is bolted to the housing. For maintenance purposes, the hinged housing hood can be rotated and the bag insert removed. This is a cheap and reasonably effective method of filtering the air, however, the filter bag must be cleaned at regular intervals.

 

Bulk Technik supplies a range of filter housings with or without a Dalamatic type filter. Two types of housings are offered, either to mount the filter horizontally or vertically. The operation of the filter is not affected by the mounting position, however, with a horizontally mounted filter is far easier to change the filter bags and service the filter air control system. If required, a counter flange for the housing can be supplied which is then welded into the silo or hopper roof.

 

 

JET CONVEYORS / VENTURI EDUCTORS

 

A jet conveyor or venturi eductor is an economic way of feeding a dry powder into a pneumatic conveying system. The jet conveyor eliminates the need of a rotary vane feeder to drop product into the conveying line.

   

 

KNIFE GATE VALVES

 

Bulk Technik can offer two types of knife gate valves: Flow Control (FC) or Flow Seal (FS).

 

The Flow Control range of knife gate valves is suitable as a discharge valve of a silo or hopper when used with gravity feeding dry granular products. These valves can be used to reduce the product flow out of a silo or to stop the flow completely. The FC series of knife gate valves are supplied with either a hand wheel or a pneumatic or hydraulic cylinder. They have a square, mild steel frame with a 3Cr12 blade, a stuffing box type seal and replaceable material deflector inserts that protect the valve sealing strips. In addition to the standard range, custom designed knife gate valves are supplied on request as well as those manufactured from stainless steel.

 

The Flow Seal series of knife gate valves are fully imported from AKO in Germany. These knife gate valves are suitable for use with liquids and non-abrasive powders up to a pressure of 10 bar (higher pressures on request). They are supplied with standard SABS 1123 or ANSI flanges with sizes ranging from 50 NB to 1200 NB. The blade of the knife gate valve is operated with either a handwheel, pneumatic actuator (single acting or double acting) or an electric bevel gear. The blade is manufactured from stainless steel, the valve body is supplied in either cast steel or stainless steel and both soft and metal seals are available.

 

 

LIME SLAKING

 

The term lime slaking applies to the combination of varying proportions of water and quicklime in order to produce milk-of-lime, a lime slurry or a viscous lime paste. Chemically, the slaking process is an exothermic reaction that releases appreciable heat and forms hydroxides.

 

There are a number of variables affecting lime slaking these include:

  • reactivity of the quicklime - whether the quicklime is hard, soft, or medium burned, which influences speed of slaking and temperature attainment
  • purity of the quicklime - whether or not the lime contains a large quantity of “non-lime” impurities
  • particle size and gradation of the quicklime - whether the quicklime is lump, ground, pulverised or run-of-kiln gradation, the finer sizes of the same quality slake most rapidly
  • optimum water amount - whether too much or too little water is used
  • temperature of the water - whether slaking water is too cold or possibly too hot (steam) for the particular slaking conditions. Slow reacting limes need heated water, reactive limes do not
  • distribution of the water - whether water is introduced into the slaking chamber unevenly as surges. An even flow is desired
  • quality of the water - whether the water is of potable quality or contains salts
  • agitation - whether too vigorous or insufficient agitation of quicklime and water is employed. Some agitation is necessary.

 

The design of the Bulk Technik lime slakers takes into account all of these factors resulting in a slaking system that is compact, self-contained and produces milk-of-lime with consistent quality and minimal unslaked grit (lime quality dependant).

 

Low maintenance has been designed into the machine e.g. the mixer impellers and grit removal screw are the only moving parts subject to wear. The main housing is protected by wear plates in every slaking compartment. There are no packing or packed bearings below liquid level.

 

The slaking process is one, in which an optimum balance between viscosity in the slaking compartment and temperature is required. The viscosity in the slaking compartment must be high enough to maintain the grit in suspension for carry-over into the separating chamber while maintaining as high a temperature as possible to produce a fine hydroxide particle.

 

In general, South African lime falls in the medium to high calcium oxide content range with the lime in the normal to over burned range. The lime will thus generally slake in less than twenty minutes, and the Bulk Technik slaker performance has been based on these grades of lime.

 

 

The Bulk Technik slurry type lime slaker consists of a welded steel tank assembly with a mixing and slaking compartments of a size and shape which achieves thorough blending and slaking of the lime. A propeller type mechanical agitator, vee belt driven is fitted to the slaking compartments. The slaked lime slurry flows into an integral grit chamber which permits suspended grit to settle out. The design of the grit chamber permits automatic grit removal without interruption of slaker operation. After grit separation and final dilution, the lime slurry is discharged by gravity flow to process.

 

The lime slaker is insulated on exterior walls in order to maintain slaking temperature with lower grades of lime. Plate-coil type heat exchangers are available as optional equipment to pre-heat the water for less reactive grades of lime.

 

The slaker material inlet is equipped with an electro-pneumatically operated butterfly valve and a feed chute with purge air connection fitted with a solenoid valve. Lime dropping in from the screw feeder creates dust. A high operating temperature in the slaker causes vapours and the combination of these two could cause excessive lime build-ups and subsequent blockages of both the chute and screw feeder.

 

Each lime slaker is shipped fully assembled, complete with grit chamber, agitator(s) and integral piping and is fitted with suitable lifting lugs for ease of installation.
   

 

LUMP BREAKERS

 

Bulk Technik has designed a range of lump breakers that have a very low height and can thereby be easily accommodated in existing plants or new installations. The lump breakers are essentially intended to break material lumps that are formed when product sticks together. They are not really intended to break foreign hard matter or crush rocks. The maximum lump sizes are approximately 10-12 mm, they are essentially determined by the gaps between the rotating cutting blades.

 

The standard series of lump breakers have a robust housing that is constructed and welded from laser cut plate. The rotating shafts are fitted with blades that are manufactured from standard mild steel or abrasion resistant metals. A disk type coupling connects the drive shaft to the geared motor, while two gear wheels on the opposite side turn the non-driven shaft in the opposing direction. The shafts are positioned by flange type bearings while a double oil-seal arrangement ensures dust free operation of the unit.

 

The lump breakers are manufactured from mild steel, however, we can also supply units that have all wetted parts fabricated from stainless steel.

 

 

PINCH VALVES

 

Pinch valves are ideal for isolating the flow of abrasive, corrosive and fibrous products, which can be in the form of a liquid, slurry or a granular powder. A pinch valve can either be closed mechanically or pneumatically, the latter being a far more cost effective option. When fully open, a pinch valve allows free, unhindered passage of the medium flowing through it, thereby producing a minimal pressure drop across the valve and also preventing line blockage or clogging. The pneumatically operated pinch valves have no moving parts so essentially they require no servicing.

 

The AKO range of pinch valves are fully imported from Germany and have become one of the global leaders in this industry. Their continuing research over the last 25 years has led to many improvements to their pinch valves as well as additions to their ever growing product range.

 

The wide variety of housings and sleeves offered by AKO, ensure that a suitable pinch valve can be supplied to meet most process requirements. Typically pinch valves are used in pneumatic conveying systems, cement industry, fitted to road tankers, pharmaceutical industry, food and wine industries amongst many more. The maximum operating pressure of the pinch valves is size dependant, but varies from 2 to 6 bar.

 

The pinch valves are supplied with either a PVC, a cast aluminium or a stainless steel housing, the latter two can be fitted with aluminium, cast steel or stainless steel flanges. The pinch valve sleeves are available in over nine different material types, these range from anti-abrasive natural rubber, to high temperature rubber, food grade rubber, EPDM, silicone and many more. AKO supplies pneumatically closing pinch valves from 10 NB up to 250 NB.

 

The mechanically operated pinch valves can be operated by hand wheel, pneumatic actuators (double or single acting), hydraulic actuators as well as electrically. Sizes range from 25 NB to 600 NB with maximum operating pressures reaching 40 bar. The pinch valves can be supplied with 10 different types of sleeves while the housings are made from grey cast iron, steel or welded steel (mild or stainless), depending on the model, nominal diameter and the pressure rating.

 

 

PORTABLE MINI SILOS / HOPPERS

 

Bulk Technik has developed a versatile mini-silo that can easily be gravity filled and then transported with a forklift and placed onto a docking station for emptying the product. The mini silos range from 1.5 m3 to 3.5 m3 and all have a spring operated discharge system that automatically closes when the silo is lifted off the docking station. Product is filled into the silo via a hinged inlet opening. These mini silo can be supplied in mild steel, 3Cr12 or stainless steel.

 

The docking station consists of a mounting frame with guide plates to allow the mini solo to be docked with the discharge mechanism. This essentially consists of a small bin activator, complete with vibrating motor, flexible sleeves and rubber sealing ring. The docking station pushes the spring operated sealing cone of the mini silo upwards, thereby creating a gap between the mini silo shell and the sealing cone for product to flow out. The vibrations of the bin activator are transferred onto the sealing cone and thus assists with discharging the product out of the mini silo.

 

Usually a screw conveyor will be fitted to the docking station to feed product to another process, however, other forms of handling the contents of the mini silo can also be used.

   

 

PNEUMATIC CONVEYING BENDS AND BARREL BENDS

 

In a pneumatic conveying system both wear and pressure drop are important factors to consider. Both of these factors are reduced if the radius of the conveying bend is increased, however, for abrasive materials such as cement, sand, mineral ores the standard bends will wear through after a short time.

 

Bulk Technik has successfully developed long radius bends that have re-enforced backing strip which prolongs a bend’s life. These type of bends are also called flat back bends and are suitable for moderately abrasive materials such as cement and fly ash. For powders that are far more abrasive, we have developed wear resistant bends that are lined with ceramic tiles or bends with basalt and silicon carbide cylinders that are placed into a metal housing.

 

 

A further alternative is to use barrel bends. These are specially designed bends which trap a pocket of material in the wear area which forms a protective layer. The major friction/wear is inter-material because the powder being conveyed is mainly in contact with the trapped material. For extremely abrasive materials, the high wear areas are protected with a ceramic lining.

 

Both the long radius bends as well as the barrel bends are supplied with SABS 1123-1000/3 flanges, however, other flanges can also be supplied on request.

   

 

PNEUMATIC KNOCKERS

 

The pneumatic knocker is a cost effective way of getting material to flow out of a bin or silo by exerting an impact force onto the silo shell. The force created by the impact is transferred into the material particles which then dislodge and begin to flow. This is essentially has the same effect as hitting the discharge with a hammer or mallet, however, the pneumatic hammer does not dent or deform the discharge spout, which then makes material flow even worse.

 

The pneumatic knocker consists of a base plate that is securely welded to the hopper or silo wall. The body of the knocker is then bolted to this and connected to a compressed air source. The internal ram is accelerated when the compressed air is opened via a hand valve or solenoid valve and then impacts the base plate. When the valve is closed, an internal spring pushes the ram back to its starting position. The intensity of the impact can be adjusted by regulating the air pressure, while different sized knockers, provide grater or smaller impact forces.

 

Unfortunately the pneumatic knockers make a relatively loud noise, because the impact onto the silo wall is not damped, since that would reduce its effectiveness. Should the noise be a problem, we can supply the unit with a sound insulation hood.

 

All the controls required to operate one or multiple knockers can also be supplied.

   

 

SAFETY VALVES

 

The silo or hopper safety valves, also known as safety flap, are simple but extremely effective and important devices to protect the silo from being over pressurised or exposed to a vacuum. Either of these conditions can result in catastrophic damage to the silo and surrounds.

 

 

When filling a silo pneumatically, the filter unit allows air to escape from the tank, thus preventing the pressure from increasing substantially. Should the filter or the filter bags be clogged or even if the filter is undersized, the pressure within the silo will rise. Typically the peak air flow is reached at the end of a conveying cycle, when the tanker or blow vessel vents through the conveying line into the silo. Should this burst of air not escape via the filter, the rise in pressure could result in structural damage or even total destruction of the silo. Even regular pressure rises that do not exceed the silo design pressure can lead to fatigue failure of welds or weakened material.

 

The silo safety valves are essentially weighted flaps that will open when the pressure exceeds the design value of 9 kPa. The Bulk Technik designed safety valve ensure that there is no ingress of water into the tank and furthermore, if installed correctly, will not stick or jam. The design also ensures that each time it has opened, it will close as soon as the pressure has dropped below the design value.

 

Conversely to the pressure safety valve, a tank also needs to be protected against a vacuum. This mainly occurs when product either collapses within the silo or when it discharges at a rapid rate, combined with the action of a filter fan. A weighted vacuum safety valve will protect the silo from imploding under these conditions. The Bulk Technik designed vacuum safety valve is designed to open at a negative pressure of -2.0 kPa. A weather cowl prevents any water from entering the silo which may then lead to lump formation and potential blockages.

 

Bulk Technik has also designed a safety valve that combines the two functions described above, thereby protecting the silo both for over and under pressures. All the safety valves are fitted with standard flanges (SABS or ANSI) and are therefore easily bolted to a silo roof nozzle.

 

All of our silo safety valves can be supplied with a proximity switch to provide feedback to the control room of high or low internal silo pressures. This will assists with filter maintenance and avoid dust contamination.

 

 

SCREW CONVEYORS

 

Bulk Technik supplies both tubular and trough screw conveyors of various sizes and lengths with drives to match the capacity. The screw conveyors can be installed horizontally or inclined at angles and they can be supplied in mild steel or different grades of stainless steel.

 

The standard tubular conveyor sizes range from 100 NB to 500 NB with their lengths being limited by the deflection of the internal screw flight shaft. Generally we do not recommend the use of centre bearings for the tubular screw conveyors, because these often lead to material blockages and maintenance issues. The tubular conveyors are supplied with a housing that has an inspection hatch on the inlet and discharge side. A screw flight with both a drive and idler shaft is custom designed for the application with specific attention given to the type of spiral that is used (solid, ribbon, tapering, increasing pitch, double pitch) as well as the materials of construction. The drive side is fitted with a stuffing box type seal, a plummer block bearing that is sized for both the radial and axial loads which result from conveying the material, a disk type coupling with guard as well as a geared motor. The non driven side is usually fitted with a flange bearing arrangement, however, this can also be supplied with a stuffing box seal and plummer block bearing.

 

The Bulk Technik trough screw conveyors essentially consist of a housing that is fabricated from plate, a number of removable covers as well an inlet and end section. This type of screw conveyor is more suited for the use of hanger bearings, hence these conveyors can be supplied in much longer lengths than their tubular counterparts. The screw flight will also be custom designed to suit the client requirements and the product type. The drive side will have a stuffing box type seal, a plummer block bearing, a disk type coupling with guard and a geared motor. The non driven side will be supplied with either a flange bearing or plummer block bearing.

 

Other type of screw conveyors that Bulk Technik can supply include: twin screw conveyors, mixing conveyors, cooling conveyors, reversible conveyors and conveyors with multiple inlets.

 

 

STORAGE SILOS

 

Each silo from the standard range of Bulk Technik bulk product storage silos is statically calculated for the given material bulk density/properties and geographical location. This is to ensure that the silo and its support structure is not either overloaded or over designed. For each silo our company will also provide an outline drawing of the support bases together with the loads that will prevail.

 

The silos are designed according to the following codes:

         - Internal material pressures:       DIN 1055 Part 6

         - External wind loads:                 SABS 0160-1989

         - Silo and structure design:         BCSA - Theory and Practical Design of Bunkers

                                                       ASI - Structural Design of Steel Bins for Bulk Solids

                                                       SABS 0162-1993

 

The standard range of bulk storage silos consist of a cylindrical mild steel silo shell, a 3 or 4 legged tubular support structure with base plates, a material inlet nozzle, a material discharge nozzle, a 125 NB nozzle for an over pressure safety flap, a 50 NB nozzle for a level transmitter, a 500 NB manhole, handrails and kick flat around the circumference of the silo roof, two lifting lugs on the side and three lifting lugs on the top.

 

The silos are manufactured in an all welded construction by coded welders according to our quality plans. All critical welds will undergo non destructive testing (NDT) to ensure the integrity of the silo, a certificate will be issued by an independent inspection authority.

 

Bulk Technik has designed and supplied many custom designed silos ranging from small hoppers to silos carrying over 1 400 t of product. Our silos can also be manufactured from 3Cr12 or stainless steel plate. Some special silo designs include:

         - sectioned silos which were shipped in containers prior to site installation

         - sectioned silos that were too large to be transported in one unit

         - silos with twin or non-circular outlets

         - silos with a cylindrical support ring, commonly used for storage of flour

         - rectangular and square silos

   

 

STORZ COUPLINGS

 

Storz couplings are widely employed in fire fighting equipment and fire hoses as well as for road tanker hoses, that are often coupled to filling pipes of silos and vessels. The Storz couplings are supplied with either a hose coupling or a threaded connection that can be male or female.

 

Storz couplings have identical locking mechanisms, with each coupling having two lugs that are screwed together with a special spanner, thereby forming a tight, leak proof seal. The couplings are suitable for line pressures of up to 16 bar.

 

When ordering Storz couplings, there are two key dimensions required, over and above the type (hose, screwed, blank). The Storz coupling size and the lug distance or KA value. It must be noted that only couplings with the same KA values can be joined (even if the size differs). For hose couplings, the length of the serrated hose tail will also be required.

 

Bulk Technik imports the Storz couplings directly from their supplier in Germany. These couplings are quality tested and certified according to DIN. Both forged and cast Storz couplings are available, but it should be noted, that forged couplings are almost 4 times stronger than the cast couplings (test results can be forwarded on request). This far superior mechanical property is extremely important when ordering couplings for applications with a pressurised gas or fluid, where failure could lead to injuries and damage to property.

   

 

TELESCOPIC LOADING SPOUTS

 

Telescopic loading spouts are generally used for dust free, gravity feeding of product from a storage silo into bulk a road tanker. Essentially a loading spout consists of a fixed filling head which is fitted to the discharge valve of a silo. A retractable filling head is fitted to this which can be lowered onto the road tanker for filling of product and then retracted once the loading process is complete. Bulk Technik supplies both manually and automated loading spots.

 

 

The manually operated loading spouts essentially have a light weight filling head which is manually lowered onto the tanker’s manhole. A flexible sleeve provides the vertical travel as well as some horizontal movement for easy positioning onto the filling hatch of the road tanker. The incorporated vent nozzle allows the dust laden air to be vented back into the silo. This basic type of loading spout does not have any level detection and is thus best suited for use with a silo that is placed on load cells or when the tanker is placed on a weigh bridge beneath the storage silo.

 

The automated loading spout allows the operator to raise and lower the filling head with a maximum travel of 1300 mm from its fully retracted to its lowest position. This loading spout is complete with an electric brake geared motor that prevents accidental unwinding of the filling head. Limit switches sense when the filling head has reached its fully retraced or extended positions and automatically stop the motor.

 

The loading head incorporates a level switch that has a protective sleeve to prevent the sensor from being damaged when lowering it onto a tanker. The level switch detects when the tanker has reached its maximum loading capacity and this provides the signal for the automated silo discharge valve to close. The loading head is rubber lined to ensure a tight seal to stop dust from escaping while product is being loaded. The loading spout consists of an inner shroud for filling material and an outer shroud allowing the displaced air from being vented back into the silo, via the vent nozzle. The vent nozzle is positioned and sized to ensure dust will not settle and gradually fill with dust, thereby making the venting process ineffective.

 

For abrasive materials or hot materials, Bulk Technik has developed metal loading spout that has the loading head fitted to tubular sleeves. This tanker loading system can be supplied in mild steel or stainless steel.

 

 

VENTURIS

 

Venturis are used in pneumatic conveying systems when additional air is required to boost the conveying air that a vessel or road tanker is providing through its material discharge. The venturi essentially creates an additional acceleration velocity combined with extra air volume to extract product from the vessel, thereby increasing the product conveying rate significantly.

 

The Bulk Technik venturis are sized from 80 NB to 150 NB and they are supplied either flanged or fitted with Storz couplings. For abrasive products, the internal wear surfaces are case hardened in order to increase the life span of the unit.