Castair 30 Gallon Horizontal Air Receiver Tank — 175 PSI (30H175)
The Castair 30H175 is a 30-gallon horizontal air receiver tank rated to 175 PSI maximum allowable working pressure. This is the standard-pressure version of the horizontal 30-gallon receiver in the Castair line — matched to single-stage compressors and most two-stage shop compressors that cut out at or below 175 PSI. If your system operates above 175 PSI, you need the 30GH200 (200 PSI) version instead. Do not use a tank below the cut-out pressure of your compressor.
Manufacturer page data was not available for this listing. Specifications are drawn from the product name and part number. Call 866-217-0063 to confirm dimensions and port specifications before ordering.
30H175 vs. 30GH200 — Which Tank Do You Need?
Pressure Rating Comparison
- 30H175 (this tank): 175 PSI MAWP — suitable for compressors with cut-out pressure at or below 175 PSI. Price: $687.76.
- 30GH200: 200 PSI MAWP — required if your compressor cuts out above 175 PSI. Price: $924.08.
- How to determine which you need: Check your compressor's cut-out (high) pressure setting. If it is 175 PSI or below, the 30H175 is rated appropriately. If it is above 175 PSI, you need the 30GH200.
- Margin: The tank MAWP should equal or exceed the compressor cut-out pressure — operating a pressure vessel above its MAWP is a safety violation and voids the tank warranty
Common Compressor Cut-Out Pressures
- Single-stage compressors: Typically cut out at 100-125 PSI — the 30H175 is well within rating
- Two-stage compressors (standard): Typically cut out at 150-175 PSI — the 30H175 is appropriate at the lower end; verify your exact setting
- Two-stage compressors (high pressure): Some cut out at 200 PSI — requires the 30GH200
Horizontal Tank Benefits
- Low profile: Fits under a compressor pump/motor assembly in a horizontal compressor configuration, or mounts in spaces with limited ceiling height
- Compressor base mounting: Horizontal receivers in this size are often the base tank for skid-mounted compressor units — the pump and motor sit on top of the tank
- Stable footprint: Lower center of gravity than a comparable vertical tank
What a 30-Gallon Receiver Does for Your System
- Air storage buffer: Stores compressed air during off-cycle to supply demand peaks without the compressor starting
- Cycle time extension: Reduces compressor short-cycling, protecting motor windings and pump components
- Moisture drop-out: Compressed air cools in the tank; condensed moisture collects at the drain — drain regularly to prevent internal corrosion
- Pressure stabilization: Smooths pressure pulsations from single and two-stage reciprocating pumps
Maintenance Requirements
- Drain condensate daily in humid climates, weekly at minimum
- Inspect all ports, valves, and welds annually for corrosion
- Verify safety relief valve operation annually — relief valves should be replaced every 3-5 years
- Do not paint over ASME certification stamps or data plates
What's in the Box
- 1x Castair 30-gallon horizontal air receiver tank, 175 PSI MAWP
- Note: Relief valve, drain valve, gauge, and fittings typically not included — confirm at time of order
Technical Specifications
- Part Number: 30H175
- Capacity: 30 gallons
- Orientation: Horizontal
- Maximum Allowable Working Pressure (MAWP): 175 PSI
- Manufacturer: Cast Air / Castair
- Price: $687.76
- Dimensions and port configuration: Call 866-217-0063 for confirmed specs
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 in air compressor systems and components
- Free shipping on qualifying orders — freight coordination available for tank shipments
- Free tech support at 866-217-0063 — confirm this is the right pressure rating for your compressor system before ordering
- Full manufacturer warranty on Cast Air tanks
- Honest guidance: We will tell you if you actually need the 200 PSI version before you buy
Call 866-217-0063 for quick answers and help!
