John Wood Company Expansion tanks are designed to absorb the expansion forces of a heating or cooling system to maintain the proper system pressurization. In contrast from diaphragm tanks, bladder tanks completely enclose the water inside a replaceable butyl rubber bladder (other bladder materials available upon request), eliminating problems such as water-logging and tank corrosion.
Optional factory welded support brackets on the shell are optionally available. They are required for the 6″ and larger sizes for seismic designs.
Lifting lugs are not designed to support the vessel in the piping system.
Designed and built in accordance with the ASME BPV Code Section VIII, Division 1
Installation: vertical or horizontal
Shell: Carbon Steel with exterior gray primer finish
System connection: top mounted Carbon Steel MNPT connection with flexible internal flow tube
Replaceable bladder: high quality butyl rubber
Full acceptance bladder
Maximum acceptance volume is approximately 90% of the tank capacity
Suitable for use in systems containing glycol
Air charge valve: ¼” Schrader charging valve, top mounted with protective guard
Maximum precharge pressure with standard flow tube: 80 PSI (optional high precharge flow tube is required for precharge pressures above 80 PSI —not included with the standard design)
Standard factory precharge: 12 PSI
