GUR KR Design Versions for Process Equipment Construction

GUR KR compensating reducers are often used along with high-performance pumps in power plants (FGD circulation pumps), chemical plants, mining operations and other facilities in which large volume flow rates of corrosive and abrasive fluids are conveyed. Here they provide great advantages over conventional solutions, i.e. a combination of a rigid DN reducer with a bellows compensator, which can be problematical particularly when conveying slurries in high DN lines (> 1000 mm).

The functional heart of our compensating reducers is a massive rubber core reinforced with textile threads providing highly damped resiliency. The reinforcing threads exhibit high elongation in response to tensile stress and are oriented in both the longitudinal and transverse directions. The textile reinforcement is designed specifically to optimise the elongation properties of the GUR KR to the application at hand. The most frequent design type selected ensures minimum length change in response to pressure fluctuations. Any pressure fluctuations occurring are transformed into circumferential expansion or contraction which is not problematical in pipelines.

The massive rubber core of GUR KR is sufficiently elastic to respond to pressure changes in the pipeline with slight deformation, in effect adapting to the pulse of the flow. This phenomenon in conjunction with the high damping factor of the rubber results in outstanding cavitation resistance. Flow speeds up to 10 m/s are permissible without causing cavitation damage.

Along with the standard PN 10 rated version, GUR KR compensating reducers are offered with flanges in conformance with ANSI, ASME and DIN PN 6, PN 16 and PN 25 as well as flanges made to customers’ specifications. GUR KR compensating reducers are available with nominal diameters up to DN 1400, in both concentric (symmetric) and eccentric (asymmetric) versions.

The basic designs of GUR KR compensating reducers can be varied within wide limits. Currently these products are available in overall lengths up to 3000 mm and partial lengths m and n of up to 1000 mm each. Lengths in excess of these figures are also possible in some cases – please contact us with your specific enquiry.

The maximum available large-side nominal KR Schnitt sym.KR Schnitt asymm.diameter DNlarge is 1400 mm.

The transition length k is calculated from the difference between the large and small inner diameters by the following formula:

k= 3 x (DNlarge – DNsmall)

This formula is valid for both concentric and eccentric GUR KR compensating reducers.

GUR KR compensating reducers are available with custom-fabricated lateral line sockets and monitoring ports. The minimum socket length ls is 100 mm up to a socket nominal diameter DNs of 150 mm. At larger socket nominal diameters the minimum socket length ls is 200 mm. The minimum separation between the socket and the nearer GUR KR end flange is 200 mm. Lateral sockets and ports can only be integrated into the cylindrical sections of the reducer. If more than one socket is to be fabricated on a cylindrical section, the minimum required separation between the sockets is given by the sum of DNs + 200 mm. However two sockets can be configured at the same length location if they are staggered by 180 ° over the circumference.

The maximum avaliable socket nominal diameter is DNs = 200 mm or 400 mm less than the nominal diameter of the cylindrical section of the GUR KR, whichever of the two is smaller.