{"id":1942,"date":"2026-07-21T10:08:48","date_gmt":"2026-07-21T08:08:48","guid":{"rendered":"https:\/\/www.lemuseedespompiers.re\/?page_id=1942"},"modified":"2026-07-23T08:58:27","modified_gmt":"2026-07-23T06:58:27","slug":"image-4","status":"publish","type":"page","link":"https:\/\/www.lemuseedespompiers.re\/index.php\/image-4\/","title":{"rendered":"Le jet droit : port\u00e9e, p\u00e9n\u00e9tration et effet m\u00e9canique"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"744\" src=\"https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-1024x744.jpeg\" alt=\"\" class=\"wp-image-2015\" srcset=\"https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-1024x744.jpeg 1024w, https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-300x218.jpeg 300w, https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-768x558.jpeg 768w, https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-1536x1116.jpeg 1536w, https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04-1320x959.jpeg 1320w, https:\/\/www.lemuseedespompiers.re\/wp-content\/uploads\/2026\/07\/photo_04.jpeg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le jet droit concentre l\u2019eau dans une direction pr\u00e9cise. Il offre g\u00e9n\u00e9ralement une port\u00e9e sup\u00e9rieure au jet diffus\u00e9 et conserve davantage d\u2019\u00e9nergie en arrivant sur le foyer. Il est utile lorsque les sapeurs-pompiers doivent agir \u00e0 distance ou faire p\u00e9n\u00e9trer l\u2019eau dans un amas de mat\u00e9riaux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sur cette photographie, la lance est dirig\u00e9e vers un feu d\u2019ordures. Ce type de foyer peut se d\u00e9velopper en profondeur, sous des couches de d\u00e9chets qui masquent les parties encore en combustion. Une extinction superficielle ne suffit alors pas toujours : des points chauds peuvent subsister et provoquer une reprise du feu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le jet produit plusieurs effets compl\u00e9mentaires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le premier est le <strong>refroidissement<\/strong>. L\u2019eau absorbe la chaleur des mat\u00e9riaux et des gaz, puis une quantit\u00e9 suppl\u00e9mentaire d\u2019\u00e9nergie lorsqu\u2019elle se vaporise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le deuxi\u00e8me est la <strong>p\u00e9n\u00e9tration<\/strong>. Des gouttes relativement grosses et rapides r\u00e9sistent mieux aux mouvements d\u2019air et atteignent plus facilement les couches profondes du foyer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le troisi\u00e8me est l\u2019<strong>effet m\u00e9canique<\/strong>. La force du jet peut d\u00e9placer des d\u00e9chets, s\u00e9parer des mat\u00e9riaux et mettre au jour des zones encore chaudes. Cet effet facilite parfois l\u2019extinction, mais il doit \u00eatre ma\u00eetris\u00e9. Un jet trop puissant peut disperser des mati\u00e8res en combustion, projeter des d\u00e9bris ou r\u00e9pandre des produits dangereux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La puissance apparente du jet ne garantit donc pas son efficacit\u00e9. Le porte-lance doit adapter la distance, le d\u00e9bit, l\u2019angle et la dur\u00e9e d\u2019application. Il peut aussi \u00eatre n\u00e9cessaire de compl\u00e9ter l\u2019action de la lance par un d\u00e9blai manuel ou m\u00e9canique afin d\u2019acc\u00e9der \u00e0 tous les foyers r\u00e9siduels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le jet droit et le jet diffus\u00e9 ne s\u2019opposent pas : ils r\u00e9pondent \u00e0 des besoins diff\u00e9rents. L\u2019efficacit\u00e9 consiste \u00e0 choisir la forme d\u2019eau correspondant au feu et \u00e0 l\u2019effet recherch\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Lieu et date : \u00e0 compl\u00e9ter \u2014 Cr\u00e9dit photographique : <\/em>COMSDIS974<em>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le jet droit concentre l\u2019eau dans une direction pr\u00e9cise. Il offre g\u00e9n\u00e9ralement une port\u00e9e sup\u00e9rieure au jet diffus\u00e9 et conserve davantage d\u2019\u00e9nergie en arrivant sur le foyer. Il est utile [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"class_list":["post-1942","page","type-page","status-publish","hentry"],"ticketed":false,"_links":{"self":[{"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/pages\/1942","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/comments?post=1942"}],"version-history":[{"count":3,"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/pages\/1942\/revisions"}],"predecessor-version":[{"id":2044,"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/pages\/1942\/revisions\/2044"}],"wp:attachment":[{"href":"https:\/\/www.lemuseedespompiers.re\/index.php\/wp-json\/wp\/v2\/media?parent=1942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}