agitator mechanical seal design made in china

YALAN research and development center is located in city of Hefei, the captial of Anhui Province, China. It has 10 very experienced senior engineers working as a team for developing new mechanical seal solutions and provide technical support to the production factory of YALAN Seals.

The team has accomplished a total amount of over 3,600 models of mechanical seals and won 28 patents and invention. The search center of YALAN Seals is also named as one of the national high tech enterprises and provincial mechanical seal design and development technical center.

We supply a wide range of products made of different materials, including rubber, stainless steel, PTFE, carbon, ceramic, Sic, TC, etc. Also, our sealing spare parts are easy to interchange and maintain.

The shaft seal is a double-acting bidirectional mechanical seal made to DIN standards.It can be applied to vessels made to DIN 28136 of steel or stainless steel with mounting flanges according to DIN 28141 fitting shaft ends made according to DIN 28154.The shaft seal is designed with a total of four seals rings,with two indentical seal ring pairs arranged back-to-back.Product and atmospheric side seal ring pairs are hydraulically balanced via flexible secondary seals.This ensures that the position of the seal rings remains unchanged also if the pressure acting on the seal is reversed.Since the flexible secondary seal are only mechanically loaded by the force of the springs acting on the seal ring,their elasticity is retained.This principle allows high radial deflection of the shaft without any negative influence on the sealing gap and consequently on the sealing effect.

The mechanical seal is the most commonly applied shaft seal for agitators worldwide.Due to its modular design it can be modified to suit various needs.By having product wetted parts that are small in size,materials such as Titanium,Hastelloy or even glass-lined parts can be used economically.

Extremely robust and distortion resistant seal rings ensure almost zero-leakage even under the roughest conditions.Special spring designs ensure uniform pre-tensioned conditions even in cases of strong agitator shaft deflection.

In most cases the seal liquid chamber is pressurized to a pressure level which lies above the vessel pressure.(This is done either by a pressure overlay or by use of the SUNKAIER pressure compensator). The achieved pressure gradient eunsures a high degree of operational safety for applications up to 40 bar even using the standard version of the seal.

Mechanical seal is the most commonly used sealing device in rotating equipment. Its design is complex as well as many different types and arrangements are available for a very wide and varied selection of process specific applications.

Utilizing our well proven technology and vast industry related experience, we have provided optimum design and most suitable sealing solutions to original equipment manufacturers and end user customers in the refinery, petrochemical, coal chemical, crude oil pipeline, pulp and paper industries. Our excellent technical support and aftersales service keep installation time to the minimum and significantly reducing plant maintenance cost.

In recent years, the requirements for mixing systems in industrial applications have increased steadily. The design of the impellers, the selection of…

Mechanical seals have been used in agitator technology since 1950. EKATO is one of the pioneers, using mechanical seals in agitators and continues to…

The characteristic feature of a triple-acting mechanical seal are its two seal chambers. Triple-acting mechanical seals can be used in a number of applications. The mechanical seal can be operated as a double-acting seal and the upper seal chamber acts as an unpressurized emergency seal.

The mechanical seal can also be operated with a pressure splitter which uses a specially designed pressure compensator that maintains the pressure in the upper seal chamber at half the value of that in the lower chamber. This enables the vessel to be operated at twice the pressure compared to a double-acting mechanical seal because the pressure is distributed over two seals.

For vessel pressures up to 200 bar, triple-acting mechanical seals are equipped with special supply systems which continuously replenish the seal liquid lost during operation.

Type CK 728 is a versatile, high-performance cartridge seal solution for steel vessels applicable in various industries, including high-purity pharmaceutical applications. High-end materials, balanced faces and a thrust bearing, in combination with a special sleeve design, secure stability of the seal settings and proper operation even in heavy-duty environments. Type CK 728 is available in liquid-lubricated (W), gas-lubricated (G), dry-running (D) or with a unique gas/dry face combination (GD). Advantages of contacting dry-running seals include freedom from contamination by barrier liquid and a low face wear rate, together with a cost-efficient, easy-to-install (gas) supply system. Advantages of gas-lubricated versions (G, GD) include the non-contacting, wear- and particle-free operation in addition, which makes these seals the perfect solution for high-end pharmaceutical applications. The GD design reduces the overall barrier gas consumption compared to G version.

The special modular design ensures maximum application flexibility through interchangeable sealing components. The standard cartridge design is available to fit on top-entry steel agitator vessels to DIN 28136, with mounting flange to DIN 28141 and agitator shaft end dimensions to DIN 28154. Modifications of adaptive hardware to fit non-DIN mixers or special equipment are available on request.

All versions are suitable for operation in potentially explosive atmospheres. Depending on individual explosion protection requirements, the seal operating limits may differ from the parameters given below.

Effectively seal your agitators with Inpro/Seal Air Mizer® shaft seals. Unlike packing, or other ineffective sealing methods, proven Air Mizer shaft seals are a non-contacting permanent sealing solution, requiring zero maintenance or rebuilds.

In 2013, Eagle Burgmann supplied its largest agitator seal to date with a shaft diameter of 480 mm. It was destined for use at a PTA facility in China. The order from SPX Flow Technology comprised 13 agitator seals and supply systems in total. The dimensions and weight (up to 1.5 tons) of the mechanical seals needed for such large diameters set new challenges for both the seal and machine manufacturers and the installation team at the facility.

The standard shaft sizes for these types of reactor and crystalliser are now 200 mm or larger. Eagle Burgmann’s largest shaft diameter to date was 480 mm. The dimensions and weight (up to 1.5 tons) of the mechanical seals needed for such large diameters set new challenges for both the seal and machine manufacturers and the installation team at the facility.

The difficulty with such large seals is managing deformation of the sliding faces and hence the shape of the sealing gap across the entire face. This is essential to ensure low and stable leakage and maintain a low sliding face temperature, which has a decisive influence on the service life of the seal. The optimum sealing gap geometry is determined by experts on the basis of extensive calculations and then veri-fied in test runs. Seals up to approximately 800 mm can be tested, and process conditions simulated, on Eagle Burgmann’s own test facilities. The limiting conditions there are the overall height, weight and diameter of the seal housing. Customer acceptance and other tests simulate temperature changes at the sliding faces together with leakage under almost real operating conditions. After the test run, the seal is allowed to cool down before being dismantled in the presence of the customer. The sliding faces and other components are then assessed.

The high pressures up to 50 bar and temperatures up to +270 °C are equally daunting challenges in PTA manufacturing. HSH type high pressure seals are therefore used, generally in the form of a pressurised double seal with integrated bearing. This is a balanced, self-closing seal, i.e. the seal remains closed even if the barrier pressure drops or in the event of pressure reversal. Any process medium is consequently prevented from reaching the seal. The cartridge design guarantees ease of assembly, which is particularly important given the enormous weight of the seals.

To withstand the high product temperatures, the seals have cooling flanges and housings. They are thus no longer cooled by the barrier medium, but via an external medium circulating in the flange and housing. In addition, the parts of the seals in contact with the product are made from special titanium alloys since the acetic acid used in the process is extremely corrosive. Flushing with nitrogen in front of the mechanical seal also prevents the medium from penetrating into the interior. Corrosion of product-contacting parts is reliably avoided, as is the formation of deposits on the seal.

The failure of a large PTA facility would prove to be very expensive, so the seals must offer the highest possible operational reliability. Shrink-fit sliding faces are employed for this reason. These offer better protection against broken rings and minimise the risk of disruptions. The operators of such facilities require agitator seals to remain in use for two to three years to enable the maintenance intervals to be kept short. Eagle Burgmann has demonstrated in many reference projects in countries such as Belgium, China and the USA that its seals fully meet the expectations placed on them. The seal manufacturer is meanwhile one of the leading suppliers with wide-ranging experience in the use of agitator seals for PTA manufacture.

Seal supply systems also play a significant role in the reliability and service life of the seals. In most cases, API plan 53C is chosen. This is a system in which the barrier pressure is generated with the aid of a pressure booster. A separate cooler may be used for cooling. Circulation is ensured either using the thermosiphon principle or by forced circulation, e.g. with a pump, depending on the viscosity of the supply medium and the load on the seal. With a pressure booster, pressurisation is achieved by pistons in relation to the pressure in the sealed space. The barrier pressure is automatically adjusted to the appropriate transmission ratio (generally 1.1 or 1.5). The system is self-regulating and responds to fluctuations in the fluid pres-sure in the sealed space. This ensures that the seal operates perfectly, even when exposed to varying conditions. In addition, the ratio between the product and barrier pressures remains constant at all times, which has a positive effect on the load on the seal and thus on its service life. Moreover, the pressure booster has the advantage that it does not have to be connected to the nitrogen supply system to generate the barrier pressure.

To sum up, it can be seen that a long service life and high operational reliability of the shaft seal depend not only on the right choice of seal and materials but also on how it is operated. Provided the characteristics of the manufacturing process, properties of the chemical substances, etc. are taken into account as well, the maintenance costs can be kept low and the availability of the facility greatly increased.

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