Tanks (Expansion)

Armstrong Expansion Tanks are designed to reduce tank sizes by up to 80% over standard designs. Expansion tanks use compressed air to maintain system pressures by accepting and expelling the changing volume of water as it heats and cools. Diaphragm or bladder tank designs isolate the expanded water from the pressure controlling air cushion – which is pre-charged at the factory and can be adjusted in the field to meet final system requirements

When renovating plumbing and heating systems, we know the importance of getting your projects completed on time. That typically means that you don’t have time to wait for replacement parts.

Since 1867, The John Wood Co. has been a dependable supplier of high quality tanks for the plumbing and heating industry. We’ve seen many changes over the years, but one thing hasn’t changed – we’re still a reliable source for tanks for plumbing and heating applications. 

Wessels manufactures three expansion tank Designs: 

Compression, Bladder and Diaphragm. Each tank style has models that are either ASME or Non-ASME coded. Tanks range in size from 2 to 10,000 gallons. Most of Wessels pressure vessels are designed using a pre-pressurized vessel with an internal bladder or diaphragm to manage fluids under pressure. The majority of Wessels products are standard catalogue models, with over 6,000 tanks in inventory for immediate shipment. Custom tanks are produced to customer specifications, for high pressures and/or special materials for severe duty applications.

Chesapeake Systems

7400 Coca-Cola Drive

Hanover, Maryland 21076-1394


Toll-Free: 800.559.2665

Office: 443.561.1600

Fax: 443.561.1601 | 443.561.1617

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