Rotating seat located directly behind the pump impeller, springs outside of the product. Very well suited to applications involving media containing solids. Does not open on pressure reversal. Two variants available, depending on the sealing pressure and shaft diameter involved. It is designed for applications involving large shaft dimensions of up to dw mm or fairly high pressure levels of up to 40 bar.
The outboard seal used in such cases is the DGS. The CGS is used as outboard seal up to nominal width It is suited for use in all applications in the chemical and pharmaceutical industries and food technology where highest product purity is required and where the entry of buffer fluid and seal abrasion is undesirable.
The centrical, rotating seat made of solid silicon carbide SiC and the wide sliding surfaces provide for high gas-film stability and maximum operational reliability with minimum gas leakage. Dimensions: see page 87 M Dimensions: see Page 89 M Item 1,2 11 17 22 The required minimum pressure difference is 3 bar. Reliable operation of the agitator gas seal is guaranteed by static lifting of the sliding faces. Before starting the machine, the required pressure difference of 3 bar has to be ensured.
The distinguishing feature of the AGSR is the rotating seat with product contact in the vessel which makes it ideal for use in all types of mixers, dryers and special machines containing pasty or sticky media.
The dead-space-free design with polished surfaces on the product side meets the requirements for sterile processes. Operating limits see note on page 1 d3 p1 t1 vg.
They are distinguished by broad sliding faces and threedimensional U or V grooves in the rotating seat. Combination of face materials: silicon carbide against silicon carbide with diamond-like carbon coating featuring excellent emergency running properties. The DGS offers a range of technical and economical advantages: low investment and operating costs, a low level of power consumption, high safety in operation and long service life, low leakage rates, no oil contamination of the product and, last but not least, an increase of the compressor's efficiency.
Operating limits see note on page 1 dN p1 t vg. Application: Where product leakages to the atmosphere are recognized as safe, e. Labyrinth to the gas side and CSR radial clearance seal to the bearing side are optional.
In the case of dirty gases the gas to be sealed has to be filtered in addition and conveyed to the seal chamber via connection "A". The resulting current from the sealing compartment prevents impurities reaching the seal. Application: Where small product leakages of process gas are admissible, e. Seal on the atmosphere side acting as a safety seal.
The tandem arrangement provides a particularly high degree of operational safety. The seal on the product side and the seal on the atmosphere side are able to absorb the complete pressure differential.
In normal operating conditions the full pressure is reduced only by the seal on the product side. Description Seal face, stationary Seat, rotating Thrust ring Spring Shaft sleeve and seat retainer Housing adapted in size to the installation space CSR radial clearance seal Labyrinth. The space between the seal on the product side and the seal on the atmosphere side is cleared by a connection "B" to the flare.
The pressure differential to be sealed by the seal on the atmosphere side equals the flare pressure, so the leakage to the atmosphere side or to the vent is very low. If the main seal fails, the second seal acts as a safety seal. This seal is used when a neutral buffer gas of suitable pressure is available but no flare. Typical applications are to be. DGS Tandem seal with intermediate labyrinth Application: Where product leakages to the atmosphere as well as buffer gas leakages to the product are inadmissible, e.
With this version the product pressure to be sealed is reduced via the seal on the product side. The entire process gas leakage is discharged via connection "B" to the flare. The seal on the atmosphere side is pressurized with buffer gas nitrogen or air via connection "C". The pressure of the buffer gas ensures that a current flows via the labyrinth to the flare outlet. A buffer gas, e. One part of the buffer gas leakage escapes to the atmosphere side and the other part to the product.
Elastomer-free, gas-lubricated compressor seal for high pressure and low pressure applications. The secondary sealing elements specially developed by Burgmann for this purpose are particularly effective in terms of automatic alignment and resistance to extrusion, temperature and chemicals. The operational reliability of the PDGS is accordingly very high. Available as a single, tandem and double seal of cartridge design. Elastomer-free, gas-lubricated metal bellows seal for single-stage steam turbines.
The TDGS impresses with its wear-free operation and extremely low leakage rates. Gas-lubricated radial clearance seal for compressors, gas turbines and other gas-conveying machines.
The aerodynamic CSR consists of a segmented carbon graphite ring with a circumferential spring. Pockets worked into the inner face produce a radial lifting force, automatically resulting in a concentric gap of a few micrometers.
In standstill mode the seal and the shaft are in contact with each other and have a good static sealing effect. Aerostatic radial clearance seal, independent of direction of rotation, supplied as a pre-assembled unit. The aerostatic CSE differs from the aerodynamic CSR in that its operating clearance is made to match the operating temperature anticipated in each application.
It works free of contact, with a fixed clearance that is automatically adopted in accordance with the operating temperature. Gas consumption of the CSE is determined for each application. Schematic diagram: Example of a gas supply system with differential pressure regulation for a tandem gas seal with intermediate labyrinth. The seal is buffered with clean inert gas to ensure reliable operation. Volumes of leaking gas are monitored, regulated and discharged in a controlled manner to ensure the seals correct and efficient operation.
For economical reasons a standard SMS is available which can be easily adapted to meet customers requirements. To prevent bearing oil from contaminating the gas seal, a further nitrogen or air buffer "separating gas" is provided between the bearing and the gas seal.
Operating principle To prevent soiling of the sliding faces, gas is drawn from a higher pressure stage of the compressor, is filtered and injected onto the gas seal as clean "flushing gas". The leakage from the first gas seal stage is discharged to the flare for. Are you looking to enhance the availability and reliability of your equipment and cut costs? Consulting, engineering: We tell you what really matters!
Inventory management: We optimize and ensure cost-efficient stockpiling. Technical support: Application trials, damage analyses, etc. Seminars: We bring you and your staff right up to date where all aspects of sealing technology are concerned.
Over 11 0 Service Centers worldwide: Theres one near you as well! The rotating spring-loaded part is positioned on the atmosphere side. The grade of carbon used in the seal face is FDA-conform and any loss of material through abrasion is harmless. For use in pharmaceutical applications the seal can be equipped on request with a rinsable and washable collecting cup for possible abraded particles.
An integrated clamping mechanism provides a non-positive connection with the shaft and ensures a robust torque input. The SeccoMix is balanced and designed for pressure reversal.
On the one hand this guarantees optimum frictional values of the sliding faces, on the other hand it ensures that the seal always remains closed in case of pressure fluctuations over the complete range of application. Atex conformity on request. The SeccoMix is equipped in addition with a sleeve for trapping any abraded particles from the seal face.
Contamination of the medium in the container is thus ruled out. The sleeve can be cleaned through the flushing bore. Description Seal face with seal face housing Drive collar Flange Seat with seat housing Clamping ring. These seals are designed to be self-closing on the product side, i. Operation is optionally the same as for the single version. The buffer pressure should be 0.
For use on carbon steel and stainless steel vessels in conformance with DIN The fitting dimensions of the mounting flanges are in accordance with DIN The sleeve dimensions comply with shaft details given in DIN Torque transmission according to DIN only by clamp connections and additional options conform to the code system page M KL Single seal with integrated floating bearing Operation of single seals only with pressureless quench Item no.
Description 01 Seal face, on the atmosphere side 02 Seal face, on the product side 06 O-ring 07 O-ring 11 Stationary seat, on the product side 12 Stationary seat, on the atmosphere side 13 O-ring 14 O-ring 15 O-ring 34 Shaft seal. M range All types of the M range available for straight, non-collared shafts all diameters.
Seal identification: M! Customized design or e. See page 68 and page L1 L2 Lw2 M Designation and position of screwed connections, extract or thread and jacking thread according to DIN Part 3. Vessel seals of the M range are factory assembled and tested cartridge units ready for fitting in special applications on glass-lined vessels to DIN The fitting dimensions of the mounting flange are in accordance with DIN Part 2. All parts exposed to the product are of non-metallic construction.
Torque transmission acc. Not illustrated. A ceramic intermediate sleeve is provided on the product side. This enables a pressure test of the seal cartridge to be made before assembly.
Due to the specific configuration of the seal flange, the seal can be lifted off the glass-lined flange ring as a complete cartridge.
The sensitive glass lined flange remains mounted on the vessel. This avoid any damaging of the glass lined surface. Nominal size 40 50 60 80 L1f L2l They have been used successfully for many years already to seal all kinds of mixers, dryers, mills, mills, masticators and reactors in the plastic, paint, food and pharmaceutical industries.
The inboard seal features a rotating seat with a smooth profile without crevices where product can lodge and cause contamination. A special version is suitable for large axial shaft movements up to mm and shaft deflections please enquire.
Gas-lubricated sliding faces Agitator seals for the MR-D series are also available as gas-lubricated designs AGSR for comparable applications as well as for sterile duty. Also refer to page The MR series satisfies all criteria for sterile processes: polished faces on the product side, smooth surface structure without crevices. HSMR Operating limits, dimensions, items and descriptions same as MR-D.
Connections as aseptic threaded couplings, e. The MR5LF-D with integrated bearing and directly mounted chopper knife mill for tanks with bottom entry drive.
Agitator seals of the HS-D range are designed for medium-to-high pressure applications. Operation only with pressurised buffer fluid.
The code system shown on page 94 does not apply, but the additional options and drives described on page 94 are available. Please specify separately. Double seal, unbalanced, with integrated floating bearing.
Description Stationary seat O-rings Seal face Seal face housing O-ring Stationary seat on the atmosphere side I4 l 45 55 60 60 65 65 65 75 75 They are operated solely with pressurised buffer fluid.
Dimensions available on request. On the product side the combination of floating throttle ring 1 and flush D prevents plastic powder entering the primary sealing area.
STD1 If an STD is employed, it is possible to change seals with the vessel loaded and under pressure shaft must be stationary! This seal is only used if the product does not harden or congeal during the shut down period.
It cannot be used if PTFE is required or for sterile operation fermenting vessels. Can be installed in all aspects. Fitting dimensions in accordance with DIN Part 1 are possible. Designation and position in accordance with DIN T3. Supply systems In some cases, for mechanical seals to function correctly the conditions in which they operate must be altered. This depends on the seal type, the duty conditions including environmental protection, and the type of equipment into which the seals are fitted.
A simple change to a single seal's operating conditions in a dead-end arrangement can be made, for instance, by adding a recirculation line from the pump discharge to the seal chamber API Plan 1.
Circulation For single seals it is generally advisable to install a circulation pipe from the discharge nozzle of the pump to the seal chamber.
There should be a close fitting neck bush between the pump casing and the seal chamber. A clean and mostly cold external medium is injected into the stuffing box in the area of the sliding faces via on orifice throttle into the medium to be sealed.
Flushing is used either to lower the temperature or to prevent deposits forming in the area of the mechanical seal. Again it is recommanded that a close fitting neck bush is employed. As operational demands increase, so too must the capabilities of the supply units to support the mechanical seal.
The following section contains the necessary information for the correct selection of supply systems and auxiliary equipment to ensure reliable operation of your mechanical seals. To guarantee the correct working of double mechanical seals, the buffer interspace between the product side and the atmosphere side of the mechanical seal must be completely filled with clean buffer medium.
The flow rate must be controlled to ensure that the temperature of the buffer medium at the outlet lies below approximately 60 C and that it does not exceed boiling point under any circumstances. The buffer fluid outlet lies at the highest point of the stuffing box for automatic venting of any vapour. After each circuit the buffer fluid is relieved and collected in a pressureless tank.
Quench is the term commonly used in sealing engineering for an arrangement that applies a pressureless external medium fluid, vapour, gas to a mechanical seal's faces on the atmosphere side.
A quench is used on the one hand when a single mechanical seal does not function at all or only within certain limits without auxiliary measures or when a double mechanical seal with pressurized buffer medium is unnecessary.
When an integral stationary seat stop is fitted, the quench pressure should not exceed 1 bar. A quench performs at least one of the duties described below. Pressure loss in the circuit must be taken into account when drawing up the design.
Plan 11 Circulation from the pump discharge, through an orifice to the seal. Plan 12 Circulation from the pump discharge, through a strainer and an orifice to the seal. Plan 13 Circulation from the seal chamber, through an orifice and back to pump suction.
It is imperative, therefore, to consult one of Burgmanns experienced specialists before taking any final decisions about an application for which you have inadequate experience. SPN man. Plan 22 Circulation from the pump discharge, through a strainer, an orifice and a cooler to the seal. Plan 23 Circulation by means of a pumping ring from the seal, through a cooler and back to the seal. Plan 53A Circulation with thermosiphon system, pressurized.
Forced circulation by pumping ring or circulation pump. Plan 53B Circulation with bladder accumulator and cooler, pressurized. Plan 21 Circulation from the pump discharge, through an orifice and a cooler to the seal. The actual operating and duty conditions. Plan 52 External fluid reservoir, pressureless, thermosiphon or forced circulation as required.
Plan 14 Circulation from pump discharge through orifice to seal chamber and trough orifice back to pump suction. Plan 32 Injection of clean fluid into the seal chamber from an external source. Plan 41 Circulation from the pump case through a cyclone separator, and clean fluid through a cooler to the seal.
Plan 2 Dead end seal chamber with no circulation. Stuffing box cooling and a neck bush are necessary, unless otherwise specified. The buffer medium fulfills two functions it dissipates the heat generated by the seal and it prevents the product from penetrating the sealing gap to any appreciable degree. Any liquid and any gas can be chosen as buffer medium, with due consideration to the corrosion resistance of the parts it comes into contact with and to its compatibility with the process medium and surroundings.
The buffer medium must not contain any solids. It is particularly important that liquid buffer media do not tend to precipitate and that they have a high boiling point, a high specific thermal capacity and good thermal conductivity.
Clean, demineralised water satisfies these requirements to a high degree. Hydraulic oil is often used in buffer fluid units and water in closed buffer fluid circuits. To prevent damage to the TS and sealing system, due allowance must be made for the coefficients of volumetric expansion of the buffer fluids used.
Pressurized by reference pressure of seal chamber. Plan 54 Circulation of clean fluid from an external system. Plan 61 Tapped connections for the customers use. Circulation systems for gas-lubricated mechanical seals Plans 71, 72, 74, 75, 76 please see page QFT Quenching fluid systems are used to supply single or tandem mechanical seals.
They act as a convenient fluid reservoir. The exchange of fluid takes place by the thermosiphon principle or by forced circulation, e. Quenching fluid tank made of transparent polyethylene, complete with clips made of stainless steel. Resistant to water, glycerine, glycols and methanol; not resistant to mineral oils and toluene. Description Storage tank capacity 4 l Clip Inlet filter with vented cap Name plate. Technical data Operating pressure: pressureless Operating temperature: 30 C The characteristic feature of this principle is that no heat is dissipated by the system.
In this case heat is dissipated by the circulation. Cooling capacity by convection is minimal however. ISO Plan Accessories Instead of the sight-glass it is possible to use a level switch to monitor the fluid volume.
Return flow via rising pipe for selective current control. Description Storage tank capacity 3 l Sight-glass Name plate Filter and breather. Lug fixture, overflow for the selective discharge of leakage. Thermosiphon or forced circulation if required. TS With the Burgmann TS system it is possible to supply buffer fluid to double and tandem seal arrangements for a broad range of applications. The buffer fluid flows via the rising pipe into the vessel and is cooled.
Particularly with natural circulation, the level should always be higher than the rising pipe to maintain the circulation and to provide the specified cooling capacity. Connection pipes to the seal should be designed with as little resistance as possible. Use compressed air or nitrogen for pressurization. TS vessels are equipped as standard with all the necessary connections and brackets. The vessel is used for the storage, pressure maintenance and cooling of buffer fluid in a sealing circuit.
Operating and installation diagram of the TS system mounting and operating instructions to be strictly observed. Thermosiphon vessel with flat ends, sight-glass for level monitoring and incorporated cooling coil. With the Burgmann TS system it is possible to supply buffer fluid to double and tandem seals. Equipped as standard with all necessary system connections and brackets. TS Thermosiphon vessel Pressure vessel with torispherical heads, sight-glass for level monitoring and incorporated cooling coil.
All threaded connections to ISO Assembly holes also in accordance with DIN Net weight approx. Bracket for refill unit Sight-glass. Technical data Volume: 9 litres Cooling coil volume: 0.
TS ses fitted on opposite sides enable optimum reading of the fluid level. It is also possible to flush the piping system and the seal without disconnecting the tubes. For this purpose it is designed for easy dismantling. A quick-release coupling should be used to connect the pressure gas to the vessel. To clean the inside of the vessel you simply have to open the union nut, disconnect the gas supply and the level switch, and lift off the vessel case.
There is no need to dismantle the seal connections, cooling water connections or base. Two sight-glas-. Technical data Max. Temperature: C Volume: Vessel 4. TS Thermosiphon systems of the TS range are designed specially for the operation and supply of mechanical seals in sterile processes. In addition to performing the four basic functions of a buffer system, the TS can also be used to make condensate, provided it is connected up to a steam line. Sterilization After the agitator drive and the cooling water supply are switched off, the condensate drain valve 2.
For the duration of the sterilization cycle approx. Making condensate At the end of the sterilization cycle, valve 2. The level switch 3 responds when the TS vessel is full. The agitator can be started up again. TS volume 4 l TS volume 7 l Thermosiphon vessels for sterile processes 1 2 3 4. TS vessel with cooling coil Shut-off valve Level switch Pressure gauge membrane transducer 5 Thermometer 6 Check valve 7 Safety valve set pressure 8 bar.
The joint is sealed at the inner diameter by an O-ring without any gaps. Dairy pipe work connections. The vessel is equipped with all essential connections for fitting additional components.
It is used for the storage, pressure maintenance and cooling of buffer fluid in the sealing circuit. Pressurization is monitored by a pressure switch. The incorporated level switch issues a signal whenever the level of buffer fluid is too low. DRU cooling buffer fluid. Pressure increase in accordance with the transmission ratio. The maximum operating pressure of 63 bar applies to the buffer pressure. With the Burgmann DRU system it is possible to supply buffer fluid to double and tandem seals for a broad range of applications.
The difference is the pressure booster is creating the buffer pressure without a nitrogen supply. Pres-sure boosters are equipped as standard with all the necessary connections and brackets. Pressure boosters for storing and. All parts are readily accessible for cleaning. Permissible operating pressure: 63 bar1 Permissible operating temperature: The split stationaryseat can be used in either side. No guarantee canbe given for a specific case mamual theexact conditions of application are knowto use and confirmed in a special agree-ment.
Whether theyare used e. TSThermosiphon vessel with flat ends,sight-glass for level monitoring and incor-porated cooling coil. Different reference temperatures are stated. Return flow viarising pipe for selective current control. Forthe duration of the sterilizationcycle approx. These seals are designed not to clog even if affec-ted by solid deposits. You should alwayscontact your Burgmann representative before making your final decision. Drive collars and housings for item 1.
Thisplan is used when pumpedfluid condenses at ambienttemperatures. With many indus-trial materials, skinresorption of subs-tances capable of penetrating the skinwith ease constitutes a far greater risk ofpoisoning than inhalation.
Operating and installation diagram of the TS system mounting and opera-ting instructions to be strictly observed. HRK-DDouble seal of cartridge design for operation in bufferpressure or quench mode does not open if buffer pressure failsavailable alternatively with a pumping screw for a higher rate of circulation.
They are compact ready-to-fit seals which can be installed in the sameaxial length as a lip-seal and can be usedto seal differential pressures of up to 25 bar. Industries Oil and gas industry Refining technology Petrochemical industry Chemical industry Pharmaceutical industry Power plant technology Pulp and paper industry Water applications Mining industry Food processing industry Shipbuilding Aerospace industry. Home Products Mechanical seals.
Mechanical seals for pumps Agitator seals Compressor seals Marine seals Show all products. Mechanical seals. It should benoted that the maximum values of eachoperating parameter cannot be applied atthe same time. Subject to change. Home Documents Burgmann Design Manual Post on Nov views.
Category: Documents 89 download. Tags: s d e s i g n main seals mr33s1d mr5lfd91mr operationindex2 b u akeyword index1b u r gaslubricatedfor pumps buffer fluid systems circulation systems. Des ign Man ual
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