Hanson lined potable hot water storage tanks are built and tested in accordance with the A.S.M.E. Boiler and Pressure Vessel Code Section IV, HLW, for unfired pressure vessels and bear the "HLW" stamp, National Board number and Manufacturer's serial number, as required. A copy of the A.S.M.E. data sheet HLW-6, signed by an A.S.M.E. authorized inspector, will be sent with the invoice if requested at time of order.

Vessels built in accordance with this section of the ASME Code are limited to a maximum working pressure of 160# and a maximum temperature of 210f.

Water tanks for other than potable hot water service (expansion, hydropneumatic, chilled, deareator, blowdown etc.) are manufactured to A.S.M.E. Section VIII Division I, and bear a "U" stamp. These are built to order.