SY/T 6671-2006 (English Version) PDF

Scope: This standard applies to both temporary and permanently installed electrical equipment. This standard may be applied if a risk of ignition exists due to mixing of flammable gases or vapors with air under normal atmospheric conditions. Normal atmospheric conditions are defined as 101.3kPa (14.7psi and 20℃ (68℉)), and the impact of changes in pressure and temperature on the explosive properties of flammable substances can be ignored. The following matters are not within the scope of application of this standard: a ) For odorized natural gas pipeline systems used for cooking, heating, air conditioning, laundry and other similar fuel uses. b) Catastrophic accidents such as blowouts or bursting of process vessels. Such extreme events are unforeseen and require emergency measures when they occur. c) Suitability of areas where non-electrical equipment is installed. d) Division of areas containing combustible dust, combustible fibers or flying objects. e) Underground facilities in mines. f) Areas where explosives are handled and manufactured. g) Areas where the presence of flammable gas mist may lead to unforeseen risks, requiring special consideration.

SY/T 6671-2006 Referenced Document

API Publ 4589 Fugitive Hydrocarbon Emissions from Oil and Gas Production Operations
API Publ 4615 Emission Factors for Oil and Gas Production Operations
API RP 14C Analysis@ Design@ Installation@ and Testing of Safety Systems for Offshore Production Facilities (EIGHTH EDITION; ERTA: May 2018)*， 2017-01-01 Update
API RP 14F Recommended Practice for Design@ Installation@ and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I@ Division 1@ and Division 2 Locations (SIXTH EDITION)*， 2018-10-01 Update
API RP 500 Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1, and Division 2*， 2023-06-01 Update
API RP 521 Guide for Pressure-Relieving and Depressuring Systems Fourth Edition; Errata February 15, 1999

2018 SY/T 6671-2017 Classification recommended practice for Class I Zone 0, Zone 1 and Zone 2 of electrical equipment sites in petroleum facilities
2006 SY/T 6671-2006 Recommended practice for classification of locations for electrical installations at petroleum facilities classified as class I, zone 0, zone 1, and zone 2