Section 6.7 — Piping Systems

(1) Piping shall be made from materials designed to withstand the effects of temperatures and pressures that may occur in the system. (See Articles 3.1.5.19., 3.1.9.1., 9.10.9.6. and 9.10.9.7. for fire safety requirements.) (2) Every pipe used in a heating or air-conditioning system shall be installed to allow for expansion and contraction due to temperature changes. (3) Supports and anchors for piping in a heating or air-conditioning system shall be designed and installed to ensure that undue stress is not placed on the supporting structure.

(1) Clearances between combustible material and bare pipes carrying steam or hot water shall conform to Table 6.7.1.2. Table 6.7.1.2. Clearance Between Steam or Hot Water Pipes and Combustible Material Forming Part of Article 6.4.2.1., Sentence 6.4.3.1.(2) and Article 6.7.1..2. Steam or Water Temperature, °C Minimum Clearance, mm Up to 95 No clearance above 95 to 120 15 above 120 25

(1) The exposed surface temperature of a steam or hot water radiator shall not exceed 70°C unless precautions are taken to prevent human contact. (See Note A-6.5.1.1.(3))

(1) Where a pipe carrying steam or hot water at a temperature above 120°C passes through a combustible floor, ceiling or wall, the construction shall be protected by a sleeve of metal or other noncombustible material not less than 50 mm larger in diameter than the pipe.

(1) Where piping for heating or air-conditioning systems is enclosed in a shaft, the requirements of Article 3.6.3.1. for shafts shall apply.

(1) Service pipes passing through a storage bin for solid fuel shall be protected or so located as to avoid damage to the pipes. (2) Except for fuel-thawing pipes, every pipe designed to operate at a temperature of 50°C or above shall be located where fuel cannot be stored in contact with it.