Component
Pressure vessel that stores compressed air, dampens pulsation, and buffers demand swings against compressor capacity.
Typical range
5–10,000+ gal, rated to compressor cut-out (typ. 175–200 PSIG)
Best for
Every compressed-air system — buffer for rotary screw, pulsation + intermittent demand for reciprocating.
Operating principle
A pressure vessel stores compressed air between the compressor and demand. It buffers intermittent demand, reduces compressor short cycling, separates condensate, and dampens pulsation from reciprocating units.
Efficiency notes
A right-sized receiver cuts short cycling and lets VSD compressors run efficiently. Undersized = frequent motor starts; oversized = long pump-up but stable pressure.
Selection guidance
Size for the demand profile and compressor type. Provide buffer for rotary screw (anti short-cycle) and larger storage for reciprocating (pulsation + intermittent draw).
Components
- Pressure vessel (ASME coded)
- Drain valve (manual/auto)
- Pressure gauge
- Safety relief valve
- Inlet/outlet fittings
- Inspection port
Common issues
- Water/oil condensate accumulation → rust, reduced capacity
- Drain failure → flooded tank, carryover
- Relief valve weeping → scale, failed seat
- Undersized tank → short cycling, motor overload
Maintenance
- Drain daily (auto drain preferred)
- Inspect externally for corrosion annually
- Internal inspection per jurisdiction (UT/visual)
- Test relief valve annually
- Never weld/modify a coded vessel
Field tips
- Size receiver ~1 gal per 1 CFM for reciprocating; 2–4 CFM buffer for rotary screw
- Locate after the aftercooler so condensate drops in the tank
- Automatic zero-loss drains save air vs timed dumps
- Tank pressure rating must exceed compressor cut-out