Kan. Admin. Regs. § 49-52-13 - Provisions for thermal expansion in hot water systems
(a) All hot
water heating systems incorporating hot water tanks or fluid relief columns
shall be installed in a manner that will prevent freezing under normal
operating conditions.
(b) Systems
with open expansion tank. If the system is equipped with an open expansion
tank, an indoor overflow from the upper portion of the expansion tank shall be
provided in addition to an open vent. The indoor overflow shall be carried
within the building to a suitable plumbing fixture or the basement.
(c) Closed systems. If the system is closed,
an airtight tank or other suitable air cushion shall be installed that will be
consistent with the volume and capacity of the system, and it shall be suitably
designed for a hydrostatic test pressure of 2 1/2 times the allowable working
pressure of the system. Expansion tanks for systems designed to operate above
30 psig shall be constructed in accordance with section VIII, division 1, as
required by section IV of the ASME code. Provisions shall be made to drain the
tank without emptying the system, except for prepressurized tanks.
(d) Non-code expansion tanks installed on hot
water heating systems shall be restricted to no more than 30 psi working
pressure.
Notes
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