Bladder Accumulators Standard design

1 31EN AccumulatorsStandard design1. FUNCTIONF luids are practically incompressible and cannot therefore store pressure compressibility of a gas is utilised in hydraulic Accumulators for storing fluids. HYDAC Bladder Accumulators are based on this principle, using nitrogen as the compressible Bladder accumulator consists of a fluid section and a gas section with the Bladder acting as the gas-tight separation element. The fluid around the Bladder is connected to the hydraulic circuit so that the Bladder accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the Bladder Accumulators can be used in a wide variety of applications, some of which are listed below: zEnergy storage zEmergency operation zForce equilibrium zLeakage compensation zVolume compensation zShock absorption zVehicle suspension zPulsation dampingSee catalogue section: zHydraulic dampers No.

2 DESIGNSB330/400/500/550/600, SB330H/SB330 NDesign zStandard Bladder accumulator SB330/400/500/550 HYDAC Standard Bladder Accumulators consist of the pressure vessel, the flexible Bladder with gas valve and the hydraulic connection with check valve. The pressure vessels are seamless and manufactured from high tensile steel. zBladder accumulator SB330N The flow-optimised design of the Standard oil valve enables the maximum possible operating fluid flow rate to increase to 25 l/s with this accumulator type. zHigh flow Bladder accumulator SB330H HYDAC high flow Bladder Accumulators type SB330 are high performance Accumulators with a flow rate of up to 30 l/s. The fluid port is enlarged to allow higher flow rates. zSB600 For higher pressures, with the ASME U stamp, HYDAC provides the series SB600 with approval S (pmax 345 bar / 5000 psi). design zBladder accumulator SB330B HYDAC Bladder Accumulators SB330B are designed to allow the Bladder to be removed from above.

3 This has the advantage that the Bladder accumulator does not need to be removed from the hydraulic system for inspection and repair capseal caplock nutlock nutgas valvevalve protection capvalve protection capspacerspacergroove nutgroove nutoil valveoil valveanti-extrusion ringanti-extrusion ringseal ringseal ringsealing systemsealing systemvent screwvent screwshellshellbladderbladdergroove nutsealing systemspaceranti-extrusion ringend capgas valve32EN Bladder MATERIALThe Bladder material must be selected in accordance with the particular operating medium or operating temperature, see section If discharge conditions are unfavourable (high p2/p0 pressure ratio, rapid discharge speed), the gas may cool to below the permitted temperature. This can cause cold cracking. The gas temperature can be calculated using the HYDAC Accumulator Simulation Program CORROSION PROTECTIONFor operation with chemically aggressive media, the accumulator shell can be supplied with corrosion protection, such as chemical nickel-plating.

4 If this is insufficient, then stainless steel hydraulic Accumulators must be INSTALLATION POSITION HYDAC Bladder Accumulators can be installed vertically, horizontally and at a slant. When installing vertically or at a slant, the oil valve must be at the bottom. For certain applications listed below, particular positions are preferable: zEnergy storage: vertical zPulsation damping: any position from horizontal to vertical zMaintaining constant pressure: any position from horizontal to vertical zVolume compensation: verticalIf the installation position is horizontal or at a slant, the effective fluid volume and the maximum permitted flow rate of the operating fluid are TYPE OF INSTALLATIONBy using an adapter, HYDAC hydraulic Accumulators with a volume of up to 1 l can be installed directly strong vibrations and volumes above 1 litre, we recommend the use of HYDAC mounting clamps or the HYDAC accumulator mounting catalogue sections: zMounting elements for hydraulic Accumulators No.

5 ZACCUSET SB No. 2. EXPLANATIONS, Operating pressureSee tables in section 3. (PED) May differ from nominal pressure for other test Permitted operating temperature of the hydraulic accumulator -10 C .. +80 C Standard design , others on Nominal volumeSee tables in section Effective gas volumeSee tables in section 3. Based on nominal dimensions, this differs slightly from the nominal volume and must be used when calculating the effective fluid Effective volumeVolume of fluid which is available between the operating pressures p2 and Max. flow rate of the operating fluidIn order to achieve the max. flow rate given in the tables, the accumulator must be installed vertically. It must be noted that a residual fluid volume of approx. 10 % of the effective gas volume remains in the accumulator. The maximum fluid flow rate was determined under specific conditions and is not applicable in all operating Working temperature and operating mediumThe permitted working temperature of a Bladder accumulator is dependent on the application limits of the metal materials and the Bladder .

6 Outside this temperature range, special materials must be used. The operating medium must also be taken into account. The following table displays a selection of elastomer materials including max. temperature range and a rough overview of resistant and non-resistant fluids. Please contact us for help in selecting a suitable code 1)Temperature rangeOverview of the fluids 2)Resistant toNot resistant toNBR Acrylonitrile butadiene rubber2-15 C .. + 80 C zMineral oil (HL, HLP) zFlame-retardant fluids from the groups HFA, HFB, HFC zSynthetic esters (HEES) zWater zSea water zAromatic hydrocarbons zChlorinated hydrocarbons (HFD-S) zAmines and ketones zHydraulic fluids from the group HFD-R zFuels5-50 C .. + 50 C9-30 C .. + 80 CECOE thylene oxide epichlorohydrin rubber3-30 C .. +120 C zMineral oil (HL, HLP) zFlame-retardant fluids from the HFB group zSynthetic esters (HEES) zWater zSea water zAromatic hydrocarbons zChlorinated hydrocarbons (HFD-S) zAmines and ketones zHydraulic fluids from the group HFD-R zFlame-retardant fluids from the groups HFA and HFC zFuelsIIRB utyl rubber4-50 C.

7 +100 C zHydraulic fluids from the group HFD-R zFlame-retardant fluids from the group HFC zWater zMineral oils and mineral greases zSynthetic esters (HEES) zAliphatic, chlorinated and aromatic hydrocarbons zFuelsFKMF luorine rubber6-10 C .. +150 C zMineral oil (HL, HLP) zHydraulic fluids from the group HFD zSynthetic esters (HEES) zFuels zAromatic hydrocarbons zInorganic acids zAmines and ketones zAmmonia zSkydrol and HyJet IV zSteam1) See section Model code, material code, accumulator bladder2) Others on request33EN Gas chargingHydraulic Accumulators must only be charged with nitrogen. Never use other gases. Risk of explosion! In principle, only use nitrogen of at least Class (filtration < 3 m). If other gases are to be used, please contact HYDAC for Limits for gas pre-charge pressurep0 p1with a permitted pressure ratio of: p2 : p0 4 : 1p2 = max. operating pressure p0 = pre-charge pressureThe specified values are maximum values and must not be considered as referring to a permanent load.

8 The tolerable pressure ratio is influenced by the geometry, temperature, fluid and flow rate as well as any gas losses due to physical Certificate codesCountryCertificate code (CC)EU member statesUAustraliaF 1)BelarusA6 CanadaS1 1)ChinaA9 Hong KongA9 IcelandUJapanPKorea (Republic)A11 New ZealandTNorwayURussiaA6 South AfricaS2 SwitzerlandUTurkeyUUkraineA10 USAS1) = Registration required in the individual territories or on Gas-side connection, Standard modelSeriesVolume [l]Gas valve typeSB330 / SB400< 15/8-18 UNF< 507/8-14 UNF / 7/8-14 UNFSB500 / SB60010 .. / 7/8-14 UNFSB550 1 .. 57/8-14 UNFO ther pressure ranges on NoticeAll work on HYDAC Bladder Accumulators must only be carried out by suitably trained staff. Incorrect installation or handling can lead to serious operating instructions must be observed! No. and repair instructions are available for work which may be carried out on the Bladder accumulator after installation and commissioning, repair work.

9 No. information such as accumulator sizing, safety information and extracts from the acceptance specifications can be found in the following catalogue section: zHYDAC Accumulator Technology No. PDF documents can be accessed at: Downloads Documents Accumulator Division34EN MODEL CODE Not all combinations are possible. Order example. For further information, please contact HYDAC. SB330 (H) 32 A 1 / 112 U 330 A 050 SeriesType code No details = Standard H = high flow N = flow-optimised valve, fluid side A = shock absorber P = pulsation damper 3) B = Bladder top-repairable E = Bladder with foam filling DA = Bladder integrity system, industry version (others on request) L = light-weight Combinations must be agreed with volume [l]Fluid port A = Standard connection, thread with internal seal face F = flange connection C = valve mounting with screws on underside E = sealing surfaces on front interface ( on thread valve) G = external thread S = special connection, to customer specificationGas side 1 = Standard design (see section ) 2 = back-up version 4)

10 3 = gas valve 7/8-14 UNF with M8 internal thread 4 = gas valve 7/8-14 UNF with gas valve connection 5/8-18 UNF 5 = gas valve in Accumulators smaller than 50 l 6 = 7/8-14 UNF gas valve 7 = gas valve 8 = gas valve (with bore in gas valve) 9 = special gas valve, to customer specificationMaterial code (MC) dependent on operating medium Standard design = 112 for mineral oils others on requestFluid port 1 = carbon steel 2 = high tensile steel 3 = stainless steel 2) 6 = low temperature steelAccumulator shell 0 = plastic coated (internally) 1 = carbon steel 2 = chemically nickel-plated (internal coating) 4 = stainless steel 2) 6 = low temperature steelAccumulator Bladder 1) 2 = NBR 5) 3 = ECO 4 = IIR 5 = NBR 5) 6 = FKM 7 = other 9 = NBR 5)Certification code U = European Pressure Equipment Directive (PED)Permitted operating pressure [bar]Connection, fluid side Thread, codes for fluid port: A, C, E, G A = thread to ISO228 (BSP) B = thread to DIN13 or ISO965/1 (metric) C = thread to ANSI ( seal SAE J 514) D = thread to ANSI (NPT) S = special thread, to customer specificationFlange, codes for fluid port: F A = EN 1092-1 welding neck flange B = flange ASME C = SAE flange 3000 psi D = SAE flange 6000 psi S = special flange, to customer specificationPre-charge pressure p0 (bar) at 20 C, must be stated clearly, if required!