This part of IEC 60079 gives requirements for the design, construction, assessment and testing and marking of rooms protected by pressurization in:<\/p>\n
a room located in an explosive gas atmosphere or explosive dust atmosphere hazardous area that does not include an internal source of a flammable substance;<\/p>\n<\/li>\n
a room located in an explosive gas atmosphere or explosive dust atmosphere hazardous area that includes an internal source of a flammable substance;<\/p>\n<\/li>\n
a room located in a non-hazardous area that includes an internal source of a flammable substance.<\/p>\n<\/li>\n<\/ul>\n
\nNOTE If ventilation is used and pressurization is not used, then this part of IEC 60079 does not apply. The situation is covered by the requirements of IEC 60079-10-1.<\/p>\n<\/blockquote>\n
A room may be a single room, multiple rooms, a complete building or a room contained within a building and includes inlet and outlet ducts. This part of IEC 60079 also includes requirements for associated equipment, safety devices and controls necessary to ensure that pressurization is established and maintained.<\/p>\n
This part of IEC 60079 covers rooms or buildings that are constructed or assembled on site, which may be either on land or off-shore, designed to facilitate the entry of personnel and primarily intended for installation by an end-user and verification on site. The room may be located in an explosive gas atmosphere or a explosive dust atmosphere requiring equipment protection levels (EPL) Gb, Db, Gc or Dc.<\/p>\n
This part of IEC 60079 does not specify the methods that may be required to ensure adequate air quality for personnel with regard to toxicity and temperature within the room.<\/p>\n
\nNOTE 1 Whilst the scope of this part of IEC 60079 does not address toxicity it is vital that proper consideration is given to this aspect to ensure the safety of personnel. National regulations and requirements should be observed in this regard.<\/p>\n
NOTE 2 There is a related standard IEC60079-2 (Equipment protection by pressurized enclosure) covering the different conditions encountered when using the pressurization technique.<\/p>\n
NOTE 3 Maintenance needs are contained in Annex B until they are included IEC 60079-17.<\/p>\n
NOTE 4 For the purposes of this part of IEC 60079, the terms “lower flammable limit (LFL)” and “lower explosive limit (LEL)” are deemed to be synonymous, and likewise the terms “upper flammable limit (UFL)” and “upper explosive limit (UEL)” are deemed to be synonymous. For ease of reference, the two abbreviations LFL and UFL may be used hereinafter to denote these two sets of terms. It should be recognized that particular authorities having jurisdiction may have overriding requirements that dictate the use of one of these sets of terms and not the other.<\/p>\n<\/blockquote>\n
This part of IEC 60079 supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.<\/p>\n
Table 1 \u2013 Exclusion of specific clauses of IEC 60079-0<\/b><\/p>\n
Applies \u2013 This requirement of IEC 60079-0 is applied without change.<\/p>\n
Excluded \u2013 This requirement of IEC 60079-0 does not apply.<\/p>\n
\nNOTE The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of IEC 60079-0, Ed 6.0. The clause numbers for the 6th and previous edition are shown for information only. This is to enable the General Requirements IEC 60079-0, Ed 5.0, to be used where necessary with this part of IEC 60079. Where there were no requirements for the 5th edition but there are for the 6th edition (indicated by NR against the 5th edition only), or where is a conflict between requirements, the 6th edition requirements should be considered.<\/p>\n<\/blockquote>\n
PDF Catalog<\/h4>\n
\n
\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 6<\/td>\n English
CONTENTS <\/td>\n<\/tr>\n\n 9<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 10<\/td>\n Table 1 \u2013 Exclusion of specific clauses of IEC 60079-0 <\/td>\n<\/tr>\n \n 12<\/td>\n 2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n\n 15<\/td>\n 4 Requirements for rooms
4.1 General
4.2 Construction <\/td>\n<\/tr>\n\n 16<\/td>\n 4.3 Mechanical strength
4.4 Openings, penetrations and seals
4.5 Doors
4.6 Inlets and outlets
4.7 Ducts
5 Clean air supply
5.1 Source of clean air <\/td>\n<\/tr>\n\n 17<\/td>\n 5.2 Environmental and air temperature conditions
5.3 Heating, ventilation and air conditioning services
5.4 Minimum flow rate
6 Purging and cleaning
6.1 General
6.2 Gases \u2013 Purging <\/td>\n<\/tr>\n\n 18<\/td>\n 6.3 Dusts \u2013 Cleaning
7 Temperature limits
8 Minimum safety provisions, safety devices and electrical disconnects
8.1 Safety devices <\/td>\n<\/tr>\n\n 19<\/td>\n 8.2 Safety devices based upon type of protection
Table 2 \u2013 Safety devices based on type of protection <\/td>\n<\/tr>\n\n 20<\/td>\n 8.3 Gas detectors
8.4 Failure of the pressurization system
9 Pressurized room in a hazardous area and with no internal source of flammable substance
9.1 General
9.2 Protective gas <\/td>\n<\/tr>\n\n 21<\/td>\n 9.3 Pressurization system
9.4 Preventing the explosive atmosphere from entering an open door
9.5 Airlock <\/td>\n<\/tr>\n\n 22<\/td>\n 9.6 Outward air velocity through a door
9.7 Air consuming device
9.8 Action when pressurization system fails <\/td>\n<\/tr>\n\n 23<\/td>\n 9.9 Re-energizing the room
10 Pressurized room in a hazardous area and containing an internal source of flammable substance
10.1 Evaluation of internal sources of a flammable substance
10.2 Applicability of Clause 9
10.3 Containment system
10.4 Sample lines <\/td>\n<\/tr>\n\n 24<\/td>\n 10.5 Types of anticipated releases <\/td>\n<\/tr>\n \n 25<\/td>\n 10.6 Safety measures
10.7 Minimum flow rate for dilution <\/td>\n<\/tr>\n\n 26<\/td>\n Table 3 \u2013 Safety devices, loss of pressurization or use of inert protective gas <\/td>\n<\/tr>\n \n 27<\/td>\n 10.8 Warning to prevent entry into a room
10.9 Air distribution
10.10 Protective gas
10.11 Additional pressurization system requirements when inert gas is used
11 Pressurized room in a non-hazardous area with internal source of flammable substance (type of protection pv)
Table 4 \u2013 Protective gasa requirements for a pressurized room with an internal flammable substance <\/td>\n<\/tr>\n\n 28<\/td>\n 11.1 Applicability of Clause 9
11.2 Applicability of Clause 10
11.3 Loss of flow of the protective gas
11.4 Safety devices
12 Verification
12.1 General
12.2 Sequence of tests
12.3 Mechanical strength test <\/td>\n<\/tr>\n\n 29<\/td>\n 12.4 Overpressure test
12.5 Purging test
12.6 Minimum pressure differential test for types of protection px, py and pz
12.7 Minimum flow rate test
12.8 Overpressure test for containment systems with limited release
12.9 Confirmation of the ratings of the safety devices
12.10 Verification sequence of operation of the safety devices <\/td>\n<\/tr>\n\n 30<\/td>\n 13 Marking
14 Technical documentation <\/td>\n<\/tr>\n\n 32<\/td>\n Annex A (normative) Containment system <\/td>\n<\/tr>\n \n 35<\/td>\n Annex B (informative) Maintenance <\/td>\n<\/tr>\n \n 36<\/td>\n Annex C (informative) Guidelines when pressurization not immediately restored <\/td>\n<\/tr>\n \n 37<\/td>\n Annex D (normative) Classification of the type of release within rooms <\/td>\n<\/tr>\n \n 39<\/td>\n Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Explosive atmospheres – Equipment protection by pressurized room “p”<\/b><\/p>\n
\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2011<\/td>\n 42<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":238801,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[637,2641],"product_tag":[],"class_list":{"0":"post-238797","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-33-160-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/238797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/238801"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=238797"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=238797"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=238797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}