572018-002 Armstrong Diaphragm Expansion Tank 30

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572018-002 Armstrong Diaphragm Expansion Tank 30 Tank Volume 4.8 gal, (18L).



Armstrong expansion tanks provide storage in hydronic systems for increased fluid volume due to temperature change and expansion/contraction, while maintaining normal system charge pressure. This helps to avoid nuisance pressure relief equipment activation and unnecessary water make-up. The double-clamped diaphragm maintains a vital and permanent pressurized air cushion, preventing expansion tank water-logging and air absorption into the hydronic system, as required for optimum trouble-free system performance.


Suspended models (Design 1) may be hung directly from Armstrong art series Air Removal Traps, connected to adequately supported piping. All other models (Design 2 and 3) are free standing. Multiple tanks may be used for increased capacity requirements.

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Warranty Information

Warranty: Quoted prices include standard factory warranties. Warranty requires install, start-up and operation as per the manufacturers IOM. Job Site Assistance: By Others Start-Up: By Others Commissioning: By Others: These services, if a project requires start up, they are responsibility of contractor or commissioning agent. Owner training assistance, as outlined in any equipment specifications the responsible of the commissioning agent. Clarifications & Exclusions 'ALTERNATES' are offered for consideration and will always be subject to the engineer's and owners approval. Excludes any seismic calculations or supports, coatings other than factory standard. Terms: prices are quoted are "each" (unless stated otherwise) and FOB point of origin with no freight allowed freight ships via common ground carrier, and inside continental US Only - any special shipping requirements to be responsibility of purchaser. We offer all prices less tax, with a validity of 30 days from the date quoted and all sales are final. Once items have shipped and left the warehouse National Pump Supply is not responsible for any damage caused during the shipping process. You must contact the shipper directly and file a claim with the shipping company. Lead Time: All prices offered are based on standard factory lead times (or) as stated within quotation. Expedited shipments may be available at an additional charge. Contact your Sales Engineer for the ETA of any specific equipment on any order or quotation.
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2 Reviews

  • 4


    Posted by Jack Adkins on 28th Aug 2020

    So far so good, It's working exactly as promised, and delivery was fast and on time

  • 5

    nice product,.fits just right

    Posted by Nigel Glocker on 26th Aug 2016

    This was the best buy for the buck we found anywhere,.and it fits just right,.thanks for the info on the measurements so we coul dmake a decision,. Cheers all!

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