HYDAC ACCUMULATORS DEVELOPMENT AND ENGINEERING

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2 HYDAC ACCUMULATORS HYDAC accumulators - a name synonymous with advanced technology, design, manufacturing and application engineering for more than 35 years. As an essential element in modern hydraulics, accumulators perform many useful functions, such as: reducing pump capacity and electrical energy providing auxiliary hydraulic power in case of an emergency limiting pressure fluctuations during temperature changes in a closed hydraulic loop compensating for leakage minimizing pump pulsations absorbing shocks Utilization of accumulators offers many benefits including: increasing system performance and efficiency lowering operating and maintenance costs providing fail-safe conditions avoiding pump, pipe and system failures to achieve longer life expectancy HYDAC offers all types of accumulators: bladder accumulators diaphragm accumulators piston accumulators dampeners 1 1 HYDAC Corporation Accumulator Division, Bethlehem, PA 2 CAD and FE-Analysis 3 Development 4 Laboratory for elastomer tests 5 Laboratory test stand All accessories needed for proper installation and maintenance of accumulators are available, including: safety and shut off blocks mounting components accumulator sets charging and gauging units DEVELOPMENT AND ENGINEERING Based on research and development in our laboratories for testing of physical, chemical and mechanical properties, HYDAC achieves the highest quality of accumulators and related parts. Finite Element Analysis is implemented in the Computer Aided Design package supporting development and engineering to optimize the performance and safety of the components. Application assistance is available utilizing HYDAC computer software to simulate your system and optimize the sizing for energy savings, shock absorption or pulsation dampening

3 MANUFACTURING AND ASSEMBLY Manufacturing and assembly at HYDAC are subject to strict quality control. HYDAC utilizes state-of-the-art manufacturing and quality assurance techniques Machining Department 7 Manufacturing Accumulator shells by spinning method. (Photo: MCS) 8 Assembly of bladder accumulators 9 Clean room 10 Electron-beam welding of diaphragm accumulators 11 Assembly of piston accumulators 3

4 CERTIFICATION Accumulators, more than any other fluid power component, are subject to a large number of inspections and code requirements, depending on where they are installed. HYDAC, a worldwide supplier of accumulators, will provide the appropriate design, inspection and documentation to suit the specific installation site, when it is clearly specified. A partial list of applicable pressure vessel certifications is listed below: ASME Code / U-Stamp Australian Standard British Standard Japan Industrial Standard Indian Standard Druckbehalterverordnung (Germany) Codap (France) Racolta (Italy) Swedish Pressure Vessel Code American Bureau of Shipping Bureau Veritas Det Norske Veritas (DNV) Germanischer Lloyd Korean Register of Shipping Lloyd s Register of Shipping Polski Rejettro Statkow Note: The Eurpean Community (EC) has the pressure equipment directive (PED) that is being phased in. Contact HYDAC for details. BLADDER ACCUMULATORS The standard bladder accumulator consists of a closed rubber bladder inside a forged steel shell. A mechanically actuated valve closes when the fluid has been expelled, blocking off the fluid port, thereby enclosing the bladder within the shell. Where high discharge rates are required, a high flow model is available, using a larger diameter fluid port. Applications with corrosive environments may require shells furnished with an internal and/or external coating or manufactured from stainless steel. The top repairable accumulator permits service and maintenance of the bladder without removing the accumulator from the machine. When the pressure level of a system permits, a low pressure accumulator may be used. It is similar to a standard bladder accumulator, except that the poppet valve is replaced by a perforated plate covering the fluid port, and the shell may be of welded construction. For applications requiring light weight a Kevlar wrapped accumulator shell is available. The wrapping supports the thinner metal shell to permit a substantial weight reduction. 4

5 Standard Bladder Accumulator Model: SB 330/600 Nominal Volume: 1 qt gal PSI Low Pressure Bladder Accumulator Model: SB 35 Nominal volume: gal PSI Bladder Accumulator with Kevlar Wrapped Construction High Pressure Bladder Accumulator Model: SB 800/1000 Nominal volume: 90 3 in Max working pressure: up to PSI High Flow Bladder Accumulator Model: SB...H (HT) Nominal volume: gal. Max. flow rate: GPM PSI Top Repairable Bladder Accumulator Model: SB 330 T / 600 T Nominal volume: gal PSI 5

6 DIAPHRAGM ACCUMULATORS A diaphragm accumulator performs the same function as a bladder accumulator, however, it operates like a membrane. A poppet is molded into the bottom of the diaphragm to prevent its extrusion through the fluid port. Diaphragm accumulators are frequently used where small volumes are required, light weight is important, a higher pressure ratio is required (up to 10:1) and low cost is a prime factor. Applications with corrosive environments may require shells furnished with an internal and/or external coating or manufactured from stainless steel. Automotive Application Welded Construction Model: SBO E... Nominal volume: 5 in in PSI Threaded Construction Model: SBO A.. Nominal volume: 6 in in PSI 6

7 STAINLESS STEEL ACCUMULATORS Stainless steel bladder, piston and diaphragm type accumulators are available in various sizes and pressure ranges. They offer special corrosion resistance, such as is needed for chemical and offshore industries, petro-chemical and nuclear power plants and for food applications. Bladder Accumulator Model: SB... Nominal volume: 90 in gal. Max working pressure: PSI Diaphragm Accumulator Model: SBO Nominal volume: 5 in in 3 Max working pressure: PSI 7

8 PISTON ACCUMULATORS A wide range of piston accumulators is available. Piston position monitoring is available using proximity switches, extending piston rod or ultrasonic techniques. Auxiliary gas bottles are frequently used with piston accumulators to privide the required gas volume. Piston Accumulator Model: SK 350/600 Nominal volume: 1 qt gal. Max working pressure: PSI Piston Accumulator With other options such as: extending piston rod, ultrasonic piston monitoring Piston Accumulator With electrical proximity switches for end position control 8

9 DAMPENERS Pulsations and shocks in hydraulic lines can result in costly damage to the piping and other system components. Reciprocating piston pumps by design create pressure pulsations, vibrations, and noise in the system. HYDAC suction stabilizers, pulsation dampeners and silencers, when applied to piston pumps, will reduce pulsations and noise. Furthermore, pressure pulsations can make control in servo systems nearly impossible without installing a pulsation dampener. HYDAC shock absorbers can be applied to greatly reduce shock wave energy. These waves can be harmful to all components in your hydraulic system. Shock waves can be created by closing a valve in a high flow line, such as one found in a petroleum terminal. Suction Stabilizer Model: SB 16 S Nominal volume: gal. up to 275 PSI Pulsation Dampener Type Bladder Accumulator Model: SB...P (PH) Nominal volume: 1 qt...10 gal PSI Pulsation Dampener Type Diaphragm Accumulator Model: SBO...P Nominal volume: 5 in in PSI Shock Absorber Model: SB 35A Nominal volume: gal PSI Silencer (Hydraulic Noise Attenuator) Model: SD250/400 Max. Flow Rate: GPM Max working pressure: PSI 9

10 ACCESSORIES A full range of accessories for the installation, service and maintenance of all accumulators completes the program. In addition to the items shown, special valve blocks and adapters are available for your particular requirements. Safety and Shut-off Blocks Model: SAB...M (E) Nominal size: up to 5800 PSI Permanent Gauging Blocks and Thermal Fuse Cap For pressures up to 5800 PSI Mounting Components (clamps and brackets) Accumulator Sets 10 Charging and Gauging Units With flexible hose and pressure gauge for pressures up to 5800 PSI Mobile and Portable Nitrogen Charging Units For pressures up to 5000 PSI

11 ACCUMULATOR STANDS The assemblies shown here are representative of our custom engineered accumulator stands. We pride ourselves in our capability to provide an engineered solution for your application problem. Accumulator Stand for a Steel Mill Application Piston Accumulators with back-up nitrogen bottles Rather than using multiple piston accumulators, auxiliary nitrogen bottles are used to provide the required gas volume, thus reducing overall cost. This concept can also be used with bladder accumulators. Bladder/Piston Accumulator Stand 11

12 Other Products from HYDAC s Accumulator Line Bladder Accumulators The bladder style accumulator is a great general purpose accumulator. It has a wide range of sizes for energy storage requirements and is well suited for shock applications. Nominal volume: 1 qt. to 15 gal. 3000, 5000 and up to psi Flow rate: up to 480 gpm Diaphragm Accumulators Diaphragm accumulators are frequently used where small volumes are required, light weight is important, a higher pressure ratio is required (up to 10:1), and low cost is a prime factor. Two styles are available weld (nonrepairable) and threaded (repairable). Both are suited for energy storage and shock applications. Nominal volume: 5 in 3 to 1 gal. 3000, 4700, and up to 10,000 psi Flow rate: up to 40 gpm Piston Accumulators A wide range of piston accumulators is available. Piston position monitoring is available using proximity switches, extending piston rod or ultrasonic techniques. Auxiliary gas bottles are frequently used with piston accumulators to provide the required gas volume. Nominal volume: 1 qt. to 100 gal. 3000, 5000, and up to psi Flow Rate: up to 2000 gpm Request catalog # Request catalog # Request catalog # Charging & Gauging To maintain system performance, HYDAC recommends a regular check of the gas precharge pressure. A loss in the gas precharge pressure will cause a drop in the system efficiency and could cause damage to the bladder, diaphragm or piston accumulator. By means of a charging and gauging unit, hydro-pneumatics accumulators are precharged with dry nitrogen or their existing gas precharge pressure is checked. For these purposes, a charging and gauging unit is connected to a commercially available nitrogen bottle via a flexible hose. The charging and gauging units incorporate a gauge, check valve in the charging connection, manual bleed valve and T-handle. Request catalog # Copyright 1999 HYDAC TECHNOLOGY CORPORATION - Brochure - Accumulator Overview - # / HYDAC CORPORATION 2280 City Line Road Bethlehem, PA Phone (610) Fax (610) powerup@hydacusa.com