Historical
ANSI Z21.13-2017/CSA 4.9-2017
ANSI Z21.13-2017/CSA 4.9-2017 - Gas-fired low pressure steam and hot water boilers
Preface
This is the Sixth edition of ANSI Z21.13 / CSA 4.9, Gas-fired low pressure steam and hot water boilers. It supersedes the previous editions published in 2014, 2013, 2010, 2004, and 2000.Scope
1.1 This Standard applies to newly produced gas-fired low-pressure steam and hot water boilers with gas inlet pressure ratings not exceeding 0.5 psi (3.5 kPa) and having input ratings of less than 12,500,000 Btu/hr (3 663 389 W) (see Clause 3, Definitions), hereinafter referred to as boilers*, constructed entirely of new unused parts and materials, for operation at or below the following pressures and temperatures:- Steam heating boilers 15 psi (103.42 kPa) steam pressure Hot water heating boilers 160 psi (1.10 MPa) water pressure 250 °F (121 °C) water temperature Hot water supply boilers 160 psi (1.10 MPa) water pressure 250 °F (121 °C) water temperature
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