MIL-DTL-5498G
3.3.2 Fluid port. The fluid port shall be designed to offer minimum restriction to fluid
flow. Means shall be provided to prevent a metal-to-metal seal between the piston and the parts
it contacts when the piston is bottomed on the fluid end.
3.3.3 Pressures. The accumulators shall be designed and constructed for operating at a
hydraulic pressure of 3,000 psi and shall be based on a maximum gas charge pressure of 2,000 psi
with all fluids exhausted. Separators shall be designed to withstand a pressure differential from the
oil to air side or air to oil side of 4,500 psi without damage. The accumulator shall be designed to
withstand proof pressure (6,000 psi) and burst pressure (12,000 psi) tests at 275 °F after loss of
strength of the materials caused by aging at 275 °F for 1,000 hours.
3.3.4 Performance. The accumulator shall pass the tests as specified in section 4.
3.4 Markings. Each accumulator shall be provided with a permanent, legible, attached
warning in red letters as follows:
MAXIMUM OPERATING PRESSURE 3,000 PSI.
RELEASE GAS AND FLUID PRESSURE BEFORE DISASSEMBLING, STORING,
OR SHIPPING ACCUMULATOR.
3.5 Nameplate. Each accumulator shall be furnished with a nameplate marked in
accordance with MIL-STD-130 and shall include the following information:
PIN (see 1.3).
a.
b.
Manufacturer's name.
c.
Manufacturer's part number.
d.
Manufacturer's serial number.
3.6 Age controls. Accumulators containing elastomeric seals shall be marked in
accordance with SAE AS1933 and SAE ARP5316.
3.7 Use of alignment rings. When alignment rings are used on pistons, it shall not be
possible to trap pressure between the piston seal area and the alignment ring area (the alignment
ring must not be able to act as a seal). The use of multi-turn spiral backup rings as alignment
rings is prohibited.
3.8 Use of retainer (snap) rings. When retainer rings are used to secure end caps, it shall
not be possible to incorrectly assemble the parts, thereby forcing the retainer ring out of its
groove by the end cap or other parts of the accumulator.
3.9 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements and promotes
economically advantageous life cycle costs.
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