. When railway facilities are required, avoid boxing in the plantby branch lines.. Hazardous areas from other existing plants or equipment mayextend over the plant limit. This could effectively reduce plotsize and thus influence the plant layout philosophy.1.2.3 Hazardous and Toxic Areasliluipment items considered a possible source of hazard should belilouped and located separatel, if possible and economic. Examples areIurnaces, flare stacks, or other direct-fired equipment containing anoPcn flame and rotating or mechanical equipment handling flamnrableor volatile liquids that could easily leak or spill. Equipment hanrllingacids or other toxic materials that could cause damage or dangerlry spillage should be grouped and contained within a bunded area.Location of Control Roomsl,ocate control rooms 15 m or more from equipment that, in operall{)n or during maintenance, can create a hazard. (If not practicable,|rcssurize.) Ensure the maximum length of a cable run to any instrunrent is no more than 90 m.l ocation of Buildings. Locate, for example, offices, first-aid rooms, cafetedas,garages, fire station, warehouses, gas holders, and workshops,at a minimum of 30 m from any hazard.. Unpressurized substations and switchrooms should be aminimum of 15 m from any hazard.. The determination of dangrous areas and thet safetyrequirements should be in accordance with the Institute ofPetroleum Safety Codes or, where this is not recognized, theapplicable national code(s).. Local bylaws and fire codes, whose requirements may be morestringent or specific than the preceding codes, takeprecedence.1.2.4 Constructability, Access, and Maintenance. 'l-he overall plant arrangement must be reviewed forconstructabilitt operation, safett and maintenance. Largeitcms of cquipment or towers that require special lifting gearnec(l a(icquatc access to lift these into place.site, line up with existing roads, columns, and stacks.. Ihc location of external railways, pipe ways, cableways,scwcrs ancl drains, ancl so forth, also may influencc the final