Being a specialist in design, development and fabrication of high pressure components in LDPE plants Uhde HPT is the market leader. Thanks to a worldwide unique spectrum of items on offer we manufacture and supply all components above 300 bars – except for compressors. By means of our comprehensive product portfolio we support our clients and licensors up to the assembly and commissioning of overall plants. Thus, our customers profit from reliable solutions from one source.
Our long-term experience gained by the implementation of LDPE projects is consequently used in favour of our clients: on the one hand, plants being in operation for several decades give evidence of the reliability and durability of our work. On the other, we can especially exploit findings resulting from long times of operation. For example, the experience that markets, technologies and demands alter continuously, is directly integrated into developments: from the beginning, the planning of new plants considers the possibility of expansions or technical modifications.
All over the world Uhde high-pressure reactors prove efficiency and reliability. Since 1955 we have been one of the major suppliers in the petrochemical industry, where we are appreciated especially for the continuous technological further developments. Today, we build reactors with inside diameters of 70 to 90 mm for pressures of up to 3,600 bars. Accordingly, production capacities have been multiplied from 10,000 t/a in the past to more than 400,000 t/a.
Autoclave reactor systems
Uhde HPT manufactures full function tested autoclave reactor systems including steel construction design as ready-to-use plants including all accessories like e.g. motors, agitators, bearings, power electrodes, flushing pumps, rupture discs, hydraulic top and bottom cover and clamp handling devices, vibration measurement, various special maintenance tools for reactor volumes from 250 to more than 2,000 l.
Piping comprises the pressure stages PN 300 to PN 4,000. Bends can be manufactured for larger radii by cold forming and for very small bending radii by hot forging. As a matter of course we also supply all needed flanged connections, blocks, moulded pieces, sealings, thermocouple and fittings for high-pressure applications. All elements are subjected to a continuously strict quality control. Maximum pressure components are additionally subjected to autofrettage.
Steel structures used for the carrying of reactor and intercooler are designed and supplied by Uhde HPT with static and dynamic loads being taken into consideration. The modular design, e.g. for intercoolers, also saves assembly time on site.
For LDPE plants we insert shut-off, control or three-way control valves whose pressure stagescomprise 300 to 4,000 bars. All port standards can be adapted according to customer wishes. As control valves substantially influence process control in case of big reactors, it is worthwhile to point out that they meet all requirements concerning speed, accuracy and long service life. The easy structure of the valves and the careful harmonization of the valve and control elements result in maximum functional safety.
Uhde HPT’s hydraulic units operate at a maximum operating pressure of 185 bars. Uhde optimizes the necessary oil tanks depending on the hydraulic valves and equips the units with oil/water cooling and filter units in compact installation technique.
Valve test station
The test equipment makes sure that valves “Made by Uhde“ can also be tested in the plants. Test items are leak tightness and functionality of the valves as well as control, accuracy and speed.
High pressure pumps
Uhde HPT is one of the leading suppliers for high-pressure pumps in LDPE plants. Since 1935 we have installed more than 1,000 high-pressure pumps in the pressure range between 125 and 14,000 bars and with discharging capacities from 10 to 20,000 l/h worldwide. Double-acting oscillating piston pumps and motion controlled phased flow injectors were developed especially for the LDPE market. We manufacture high-quality pumps for the catalyst injection and comonomer dosing in autoclaves and tube reactors for all well-known licensors. In the meantime permanent research and development as well as the exchange of experience with our customers have resulted in excellent service live of all main components.
High pressure vessels
Important components of LDPE plants are high-pressure vessels in all sizes; they are mostly used as separators at pressures of between 300 bars and 700 bars. Thanks to the use of selected steel grades and specific manufacturing know-how Uhde HPT high-pressure vessels are among the top products.
Uhde HPT is specialized in development and manufacture as to the selection of materials and design according to the licensors’ demands for high-pressure applications. For double tube or tube bundle heat exchangers for operations in pressure ranges between 300 and 500 bars Uhde guarantees both, mechanical and thermal designs. Corrosion prevention is – if required – implemented by overlay-welding of stainless steel.