{"id":563,"date":"2026-07-29T08:34:43","date_gmt":"2026-07-29T08:34:43","guid":{"rendered":"https:\/\/boostercompressorforoxygen.com\/150-bar-vs-165-bar-cylinder-filling-which-specification-is-right-for-your-station\/"},"modified":"2026-07-29T08:34:43","modified_gmt":"2026-07-29T08:34:43","slug":"150-bar-vs-165-bar-cylinder-filling-which-specification-is-right-for-your-station","status":"publish","type":"post","link":"https:\/\/boostercompressorforoxygen.com\/fa\/150-bar-vs-165-bar-cylinder-filling-which-specification-is-right-for-your-station\/","title":{"rendered":"150 Bar vs 165 Bar Cylinder Filling: Which Specification Is Right for Your Station?"},"content":{"rendered":"

Two Standards, One Decision Point<\/h2>\n

When specifying a new oxygen cylinder filling station, the fill pressure \u2014 150 bar or 165 bar \u2014 is one of the first decisions you will make. It affects the compressor specification, the cylinder valve specification, the manifold and hose rated pressure, and the cylinder testing schedule your gas authority will require.<\/p>\n

Most buyers already know which standard applies to their cylinders before they specify the compressor. But we regularly receive enquiries from operators who are expanding capacity, converting from one standard to another, or setting up a new station in a market where they are unfamiliar with local cylinder standards. This article sets out the practical differences between the two specifications and the factors that determine which is appropriate for your operation.<\/p>\n

\"ZW-1\/150
ZW-1\/150: our most compact cylinder filling compressor. 1.0 m\u00b3\/min inlet, 15.0 MPa (150 bar) outlet, five-stage oil-free, 380V. Suitable for single-rack medical oxygen stations.<\/figcaption><\/figure>\n

The Physical Difference: Fill Density<\/h2>\n

The difference between 150 bar and 165 bar fill pressure is a 10% increase in the mass of gas stored per cylinder at the same temperature. For a standard 40-litre water capacity T-type cylinder:<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\n150 bar fill<\/th>\n165 bar fill<\/th>\n<\/tr>\n<\/thead>\n
Fill pressure at 15\u00b0C<\/td>\n15.0 MPa (150 bar)<\/td>\n16.5 MPa (165 bar)<\/td>\n<\/tr>\n
Gas content (40 L cylinder)<\/td>\n~6.0 Nm\u00b3<\/td>\n~6.6 Nm\u00b3<\/td>\n<\/tr>\n
Increase in content<\/td>\n\u2014<\/td>\n~10%<\/td>\n<\/tr>\n
Cylinder working pressure rating required<\/td>\n200 bar (standard T-type)<\/td>\n230 bar (or 200 bar with 5\/6 fill ratio)<\/td>\n<\/tr>\n
Compressor outlet pressure<\/td>\n15.0 MPa<\/td>\n16.5 MPa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

For a filling station operator, the benefit of 165 bar is clear: more gas per cylinder, fewer deliveries for the same volume sold, or the ability to serve customers who require more than 150 bar working pressure in their cylinders.<\/p>\n

Cylinder Compatibility: The Critical Constraint<\/h2>\n

You cannot fill an existing 200 bar-rated cylinder to 165 bar and consider it compliant. The fill pressure must not exceed the cylinder’s design fill pressure, which is determined by its working pressure rating and the applicable national cylinder standard.<\/p>\n

In most markets, standard T-type industrial oxygen cylinders carry a 200 bar test pressure and a 150 bar working (fill) pressure. Filling to 165 bar would require either:<\/p>\n