ISO/TC 244/WG 7 - Safety Requirements for Steelmaking Equipment

This document: — specifies the general safety requirements for secondary steelmaking machinery and equipment (SSME) as defined in 3.1 to treat liquid steel; — deals with all significant hazards, hazardous situations and events pertinent to SSME, when used as intended and under conditions foreseen by the manufacturer, but also includes foreseeable misuse, faults and malfunctions; — specifies the requirements to ensure the safety of persons which are to be met during the design, pre-assembly, transport, sites assembly, commissioning, operation, maintenance, decommissioning and dismantling/ disassembling of the equipment; — assumes that SSMEs are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment. This document applies to SSME involved in the treatment process of liquid steel under vacuum or atmospheric pressure and covers: — LF, ladle furnace, — VD, vacuum degassing, — VOD, vacuum oxygen decarburization, — RH (OB), Ruhrstahl Heraeus (oxygen blowing), — process related interfaces/interactions (e.g. according to design, controls) to: a) process media, b) primary and secondary gas cleaning plant, c) material handling systems, d) transfer cars for steel ladle, and e) crane and ladle. NOTE 1 Due to the variety of secondary metallurgical processes, there are other variants (e.g. VODC – vacuum oxygen decarburization converter, CAS, CAS - OB) in addition to the main processes discussed in this document. Most countries require that applicable safety requirements, specific to this equipment be implemented. This document does not cover safety requirements for the following equipment: — cranes; — transfer cars, e.g. ladle transfer cars, tank cars, maintenance cars; — fork lift trucks or other transporting equipment; — ladles; — equipment for relining and preheating in the relining area; — burners according to ISO 13577‑2 (the burner lances for RH vessels are covered by ISO 13577‑2 except for maximum main burner ignition time, see 5.2.26.2); — cleaning and treatment of dust and fume exhaust systems; — process media (e.g. air separation, boiler house, steam generation system); — material handling systems. NOTE 2 Significant hazards and hazardous situations due to transporting/positioning of heavy components, e.g. by cranes (e.g. ladles, vessels, covers) are considered in this document (see 5.2.3). This document is not applicable to SSMEs and associated equipment manufactured before the date of its publication.

This document applies for new steel converter and its associated equipment (hereinafter referred to as converter plant) used in the process of carbon or stainless steel making as defined in 3.1 and illustrated in Annex B. This document deals with significant hazards, hazardous situations and events relevant to the converter plant. It covers the intended use and foreseeable misuse. This document specifies the safety requirements to be met during design, pre-assembly, transport, site-assembly, commissioning, operation, maintenance (as described in Clause 5) and decommissioning/dis­assembly of the equipment. Assembly does not include erection because national regulations, e.g. national civil engineering laws and regulations or occupational health and safety regulations contain such information. This document applies to: Steel converter and its associated equipment (see Annex B, Figure B.1 for the oxygen steelmaking process — from charging hot metal/liquid steel and scrap; — via oxygen refining and stirring; — temperature measurement and sampling equipment; — up to tapping including slag retaining device; — cooling systems; — maintenance devices (e.g. relining device, tap hole repair device, device for cleaning the converter mouth); — process related interfaces/interactions (e.g. according to design, controls) to — process media, — primary and secondary gas cleaning plant, — material feeding systems and ladle alloying systems, — transfer cars for steel ladle and slag pot, and — charging/tapping equipment, e.g. crane, scrap chute, ladles and slag pots. This document does not cover safety requirements for: — usage of process media other than oxygen, nitrogen, argon and compressed air; — primary and secondary gas cleaning plants; — measuring devices with radioactive sources; — material feeding systems and ladle alloying systems; — transfer cars for steel ladle and slag pot; — charging/tapping and de-slagging equipment, e.g. crane, scrap chutes, ladles and slag pots; — auxiliary winches and hoists. For variations of converter process where other gases and process media, e.g. hydrocarbons, fuels, steam, etc. are used, additional safety measures shall be considered which are not covered in this safety standard. NOTE In case of revamping, this document can be used as a guideline for the specific parts to be revamped. This document is not applicable to steel converter and associated equipment manufactured before the date of its publication.