Hydac SB600TR-20A1/112S-345C Bladder Accumulator, 20 L

A 5000 psi top-repairable accumulator for heavy hydraulic presses and test rigs

The Hydac SB600TR-20A1/112S-345C (HYDAC part number 2065279) combines the 345 bar (5000 psi) SB600 shell with the top-repairable design. The nominal volume is 20 litres, or 5 gallons, with an SAE-24 (1 7/8-12 UN) female fluid connection, a Buna-N bladder and a carbon steel shell and valve. HYDAC lists it with ASME certification and a flow figure of 240 gpm.

It measures 247 mm in diameter and 851 mm (33.5 inches) in height and weighs 113 kg (248 lb), so it is a heavy, high-energy vessel that needs proper handling and support.

Technical specifications

What the code says

SB 600 TR – 20 A 1 / 112 S – 345 C: SB600 is the 5000 psi bladder series, TR the top-repairable design, 20 the size in litres, A a threaded connection, 1 the gas valve version, 112 the mineral oil material code, S the USA country code, 345 the working pressure in bar and C the SAE fluid port type. A similar 10 litre bottom-repairable unit, the SB600-10A1/112S-345C, uses the same shell family but a smaller volume.

Planning a high-pressure installation

At 345 bar the stored energy is large, so the circuit needs a safety and shut-off block, a certified relief valve and a documented discharge procedure before anyone works on the gas or fluid side. Top-repairable construction lets maintenance staff replace the bladder from the top without disconnecting the fluid line, which saves downtime on fixed installations. The datasheet lists oil field and offshore, machine tools, mining and mobile equipment among typical uses. Check the country approval carried by the code against what your site requires.

Remember that this series is heavier than the SB330 range, so lifting points and support brackets must be specified for the filled weight. Keep a log of precharge checks and request the matching mounting components with the order, so the fixing matches the shell diameter.

A top-repairable shell at this pressure rating is a good choice for fixed hydraulic plant such as presses, test benches and pump stations, where taking the pipework apart for service is costly. The catalogue item gives the main dimensions as 247 mm diameter and 851 mm height, so check the room around the unit, including the space above for bladder removal. Because HYDAC supplies the shell with the datasheet figure of 240 gpm discharge flow, the connecting pipe, block and valves must be sized to match that flow without causing excessive pressure loss. Always confirm the maximum working pressure on the nameplate of the delivered unit and make sure the safety valve in the circuit is set below it.

Related Hydac products: Hydac SB600-10A1/112S-345C Bladder Accumulator, 345 bar, Hydac SB330TR-10A1/112S1-210A Bladder Accumulator, 10 L, Hydac SBO200-1E1/112S-210AB Diaphragm Accumulator, 1 L, Hydac SB330 Bladder Accumulator, Hydac SK280-0.5/3218U-280ACF-VB-05 Piston Accumulator and Hydac SB330TR-32A1/112S-210A Bladder Accumulator, 32 L.

Documents and quotation

The bladder accumulator catalogue section is attached. Please state the precharge, fluid and approval. See also our hydraulic valves and components category.

How the SB600TR-20A1/112S-345C works

The SB600TR-20A1/112S-345C is a hydro-pneumatic accumulator: a closed elastomer bladder filled with nitrogen sits inside a forged steel shell, and the bladder keeps the gas and the oil completely separate. The bladder is precharged through the gas valve to a pressure below the minimum working pressure of the circuit. As the system pressure rises, oil flows in through the fluid port and compresses the nitrogen; as the pressure falls, the gas expands and pushes the oil back into the system. A mechanically actuated fluid poppet valve closes the port when the stored oil has been delivered, so the bladder is not pushed into the connection.

In the TR design the bladder is withdrawn through the gas end of the shell, so the accumulator can stay connected to the pipework during bladder replacement. HYDAC lists energy storage, shock absorption, pulsation damping, leakage loss compensation and volume compensation as the main functions of its bladder accumulators.

SB600 TR size range

The datasheet lists the top-repairable SB 600 TR in these sizes. Dimensions are for general information only.

For the 20 litre size the effective gas volume is 1125 in³. Common dimensions in this range are B = 3.1 in (80 mm), C = 1.6 in (40 mm) and E = 3.0 in (76 mm), and the maximum recommended discharge flow for vertically mounted units is 240 gpm. A split-flange version is also listed for the SB600 range with an SAE 1½″ Code 62 flange.

SB600TR-20A1/112S-345C selection & ordering guide

• Bladder compound: NBR is standard for mineral oil (5 to 180 °F). HYDAC also offers LT-NBR and ELT-NBR for low temperature, ECO for water and water-glycol, IIR for phosphate esters and FPM for chlorinated hydrocarbons. Check the fluid manufacturer’s recommendation.
• Fluid port: C = SAE thread to ANSI B1.1; A = BSPP, B = metric, D = NPT; flanged versions are also available.
• Country of installation: S = USA; U = PED/CE, S1 = Canada CRN, W1 = ABS and W3 = DNV are listed alternatives.
• Corrosion protection: coatings and stainless steel parts are offered for aggressive fluids or environments.
• Precharge: can be specified in bar as part of the code.

Our team can help confirm the correct ordering code for your pressure, fluid and certification.

Installation & maintenance

• Mount vertically with the fluid port at the bottom for energy storage; horizontal or angled mounting reduces the usable volume.
• Use HYDAC clamps and brackets sized for the shell to minimise failure from vibration.
• Install a safety and shut-off block and discharge the oil side completely before any work.
• Precharge with nitrogen only, using a suitable charging and gauging unit, and record regular precharge checks.
• Leave clear space above the unit for removing the bladder through the gas end.

Typical applications in Oman & the GCC

HYDAC names oil field and offshore, machine tools, mining and mobile and construction equipment among the uses of its bladder accumulators. In Oman and the GCC a 20 litre, 345 bar top-repairable unit suits fixed high-pressure hydraulic plant such as presses, test rigs, pump stations and valve control systems, where keeping the pipework intact during service reduces downtime.

Why source from Seven Star LLC

Seven Star LLC supplies HYDAC SB600TR accumulators, replacement bladders, gas valves and mounting accessories across Oman and the GCC. Request a quote for the SB600TR-20A1/112S-345C with your precharge, fluid and approval requirements.