{"product_id":"armstrong-572006-311-ast-125-asme-pre-pressurized-expansion-tank","title":"Armstrong 572006-311 AST-125 ASME Pre-Pressurized Expansion Tank","description":"\u003cp\u003eMaintain stable pressure in your commercial hydronic heating or cooling system with the reliable \u003cstrong\u003eArmstrong 572006-311\u003c\/strong\u003e AST-125 ASME pre-pressurized expansion tank. Engineered for durability and high-performance, this vessel effectively manages water volume fluctuations caused by thermal expansion, protecting your system components from excessive stress and pressure spikes.\u003c\/p\u003e\u003cp\u003eThe unit functions by utilizing a sealed-in, heavy-duty diaphragm that separates the system fluid from a pre-charged air cushion. As system temperature rises, the excess fluid is pushed into the tank, compressing the air cushion; as the system cools, the air pressure forces the fluid back into the piping, ensuring constant system pressure and preventing air intake.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME Compliance:\u003c\/strong\u003e Built to stringent ASME Section VIII standards for safety and pressure vessel reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e Efficiently absorbs volume increases to minimize safety valve discharge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Protection:\u003c\/strong\u003e Reduces the strain on circulators, valves, and piping connections to prolong service life.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for commercial boiler systems, closed-loop hydronic heating circuits, chilled water loops, and heavy-duty HVAC installations requiring consistent pressure regulation.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43133359259742,"sku":"572006-311","price":4026.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/572006_311_image_31ef2e06-9292-416a-b393-acbcac8d2e15.png?v=1786104745","url":"https:\/\/nationalboilersupply.com\/products\/armstrong-572006-311-ast-125-asme-pre-pressurized-expansion-tank","provider":"National Boiler Supply","version":"1.0","type":"link"}