Back to product range

OT Series

Expanflex type OT tanks are ASME fixed diaphragm type precharged expansion tanks equipped with an ExpanView tank integrity indicator. They are designed to absorb the expansion forces and control the pressure in heating/cooling systems. The system’s expanded water (fully compatible with water/glycol mixtures) is contained in a heavy-duty butyl diaphragm preventing tank corrosion and waterlogging problems.

OT expansion tanks reduce tank sizes by up to 80%. ASME Fixed Bladder Type PreCharged Expansion Tanks for commercial and industrial heating/cooling systems available in sizes from 7.8 gallons to 211 gallons.

Submittal &
Literature

Submittal Installation Diagram

Specifications

• ASME Section VIII construction and label
• Heavy-duty butyl diaphragm
• Permanent separation of air and water
• Smaller sizes for easier handling, and savings space and installation costs
• Can be manifolded for more capacity
• Factory precharged 12 PSI and field adjustable
• Equipped with ExpanView, a tank integrity indicator alerting the user of a diaphragm leak by changing color

Features OT Series

Model Tank volume (gal/L) Acceptance volume (gal/L) Connection (in)
OT15 7.8/30 6.3/24 3/4"
OT20 11/42 8.8/33 3/4"
OT40 25/95 20.2/76 1"
OT60 35/132 28/106 1"
OT80 45/170 36/136 1"
OT100 60/227 48.5/184 1"
OT120 70/265 56.5/214 1 1/2"
OT144 80/303 65/246 1 1/2"
OT180 90/341 73/276 1 1/2"
OT200 115/435 93/352 1 1/2"
OT240 140/3530 113.5/430 1 1/2"
OT260 158/598 128/485 1 1/2"
OT280 211/799 171/647 1 1/2"