Shell boilers - Requirements for limiting devices of the boiler and accessories
Shell boilers - Requirements for limiting devices of the boiler and accessories
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Shell boilers - Requirements for limiting devices of the boiler and accessories

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1   Scope

This document specifies requirements for limiters which are incorporated into safety systems for shell boilers as specified in EN 12953‑1:2012.
The design requirements and examination of the limiters are covered in this document.

NOTE See Annex E for determination of the characteristic data for use in protective circuits with a safety integrity level (SIL) rating. The requirements for limiters with regard to the safety integrity level (SIL), for example, in accordance with EN 61508 are not covered in this document.