HYDRAULIC SNUBBERS
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Snubbers TABLE OF CONTENT QUIRI HYDRAULIC SNUBBERS Design of QUIRI snubbers Valve Painting Snubber selection criteria STANDARD SNUBBERS (DAST) Technical specifications / Dimensionnal characteristics COMPACT SNUBBERS (DACP) Technical specifications / Dimensionnal characteristics LOW TEMPERATURE SNUBBERS (DALT) Technical specifications / Dimensionnal characteristics LARGE BORE SNUBBERS (DALB) Technical specifications / Dimensionnal characteristics ACCESSORIES FOR SNUBBERS SNUBBER DYNAMIC TEST BENCH Description Technical characteristic Optional Not included SNUBBER FILLING BENCH Description...

Snubbers APPLICATIONS The snubbers are dynamic linear supports designed to limit unwanted sudden movements of components such as: • Pipes • Tanks • Control valves • Steam generators • Safety valves • Pumps, motors, etc. Free movement under the locking speed The snubbers enable slow movements due to thermal dilatation in both directions. When a dynamic event which could be harmful to the installation occurs, the snubbers lock and transfer the energy to the fixed structure. Once the disturbance has passed, the device returns to its initial state and enables slow movements once again. In that...

Snubbers QUIRI HYDRAULIC SNUBBERS Design of QUIRI Snubbers Raw materials All raw materials are forged or rolled steel. This technology reduces the risk of porosity and failure, compare to molded and welded steel. QUIRI snubbers are designed to withstand the hot, humid and irradiated atmospheres prevalent in nuclear and thermal power plants. Operation mode Type A mode: Lock and drift Valves V1 and V2 allow a limited fluid flow between chambers CH1 and CH2. The drift speed after locking is generally set from 0.1 mm/s to 2 mm/s or as requested. The drift movement is required to relax a pipe...

Snubbers QUIRI HYDRAULIC SNUBBERS Valve Lockup valve defining the lockup velocity are tested one by one in our factory. Lockup valves are designed and sized to be independent from the fluid viscosity and temperature. QUIRI uses Self Cleaning Lockup Valve. The self cleaning lockup valve (SCLV) ensures 2 functions: block and drift. The integration of both functions is made by machining a «V» shape slit on the working area of the valve so that: • The SCLV is never totally closed to ensure the decompression • After drift trough the «V» shape slit, the pressure will decrease and allows the...

Standard snubbers (DAST) TECHNICAL SPECIFICATIONS Standard Snubbers (DAST) are used for all applications in conventional plants. Snubbers are made with standard components, mainly available on stock. Stainless steel rod with chemical nickel coating or chrominium Body an internal parts in high quality carbon steel, surface protection by painting. Dynamic characteristics at ambient temperature, 15°C to 35°C Hereofter standard values, (others available on demand) FN is the Nominal load of the snubber Locking speed: 2 mm/s to 10 mm/s or as requested Drag force at slow speeds, before locking f <...

Standard snubbers (DAST) TECHNICAL SPECIFICATIONS The permissible load in terms of dynamic stress in the table below has been calculated in accordance with RCCM code vol. H level S1. Load definition : Normal/Disturbed - Level A/B: Here are estimated all loads due to normal functioning, including normal transitional regime during operation of the plant. And also some disturbed loads due to normal functioning of the plant. Emergency : Level C: Here are estimated all loads outside to normal operation due to particulars situations, possibly safety shutdown earthquake. Faulted : Level D: Here...

Standard snubbers (DAST) DIMENSIONAL CHARACTERISTICS Nominal load Level B (kN) Faulted load Level D (kN) Other load, stroke or characteristics on demand. QUIRI Hydromécanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : quiri.hydro@quiri.

QUIRI Hydromécanique - FRANCE

Compact snubbers (DACP) TECHNICAL SPECIFICATIONS Compact Snubbers (DACP) are used in conventional plants, for particular sizing solution. Snubbers designed also for nuclear applications, fully respect all nuclear norms and standards, qualified for nuclear applications. Special fabrication on demand. Stainless steel rod with chemical nickel coating or chrominium Body an internal parts in high quality carbon steel, surface protection by painting or chimical nickel coating. If required with all nuclear traçability Dynamic characteristics at ambient temperature, 15°C to 35°C Hereofter standard...

Compact snubbers (DACP) TECHNICAL SPECIFICATIONS The permissible load in terms of dynamic stress in the table below has been calculated in accordance with RCCM code vol. H level S1. Load definition : Normal/Disturbed - Level A/B: Here are estimated all loads due to normal functioning, including normal transitional regime during operation of the plant. And also some disturbed loads due to normal functioning of the plant. Emergency : Level C: Here are estimated all loads outside to normal operation due to particulars situations, possibly safety shutdown earthquake. Faulted : Level D: Here are...

Compact snubbers (DACP) DIMENSIONAL CHARACTERISTICS Nominal load Level B (kN) Faulted load Level D (kN) Weight without bracket (kg) - Other load, stroke or characteristics on demand. QUIRI Hydromécanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : quiri.hydro@quiri.com

QUIRI Hydromécanique - FRANCE

Low temperature snubbers (DALT) TECHNICAL SPECIFICATIONS Low Temperature Snubbers (DALT) are used in special ambient temperature, designed for special low temperature applications. Special fabrication on demande. Special high mechanical resistance material at low temperature (- 40°C) for body, rod and internal parts. Special low temperature surface protection by 3 coats painting system. Special low temperature oil. Dynamic characteristics at room temperature, 15°C to 35°C Hereofter standard values, (others possible on demand) FN is the Nominal load of the snubber Locking speed: 2 mm/s to 10...