hard hard alternatively specific type fire drafting operations fire engine uses vacuum draw water portable water tank pool static water source built withstand vacuum pressure heat united_states standard equipment according standards fire engines structural world connection types usage hard known specific type rigid fire drafting operations technique fire engine draws water fire fighting supply portable water tank pool static water source instead drawing water water supply fire complete vacuum conditions pump lift water feet pumps fire apparatus capable producing high vacuum limitation friction loss fire services recommend attempting lift water metres hard connect fire engine practice common australia woven jacket fire normally purpose united_states hard manner requires fire engine positioned carefully limited flexibility require multiple firefighters weight bulk section certain circumstances possible use hard draft adequate water supply low flow rate built withstand vacuum water pressure heat constructed differently standard fire different end fittings united_states standard equipment according standards fire engines hard folded typically mounted fire engine opposite ground structural world hard extend range water tender dumping capability fittings hard match tender dumping water fill portable dump tank immediately adjacent water tender fire engine draft water movement dumping relies gravity mechanical hard useful task characteristics construction hard differs standard fire construction usage rigid generally manufactured synthetic material shaped series rings shape allows somewhat flexible allowing collapse normal woven jacket fire uses standard fire pressure designed minimize water leaking connecting hard sections pump instead prevent air entering vacuum allow air pump intake large diameter inch greater hard typically use fittings inch smaller hard typically use fittings case hard connection match fittings pump intake supply hard place supply appropriate short typically hard comes feet lengths fire comes feet lengths fire engine pump produces partial vacuum recommended lifting water metres reason junction opportunity crack imperfect seal vacuum rare sections hard connected designed use fire streams nature hard necessary drafting renders unsuitable high pressure water flow needed spray stream water fire hard tested ability prevent collapse vacuum conditions ability function attack hard steam gas powered fire engines available referred spiral diameter hard comes multiple sizes inches diameter large diameter carried size fire engines smaller hard carried apparatus smaller fire pump ratings fire engines united_states requires engines hard matches engine pump rating example engine minute pump required carry inch larger fire engine typically carry inch hard united_kingdom range metric smallest provide adequate flow rates range centimetres fitted centimetres centimetres comes types fittings provide tables maximum flow rates given pump pressure diameter total length use tables facilitate selection suitable taking account losses caused transporting water pump fire fighting draft water source drafting operation pool portable water tank uncovered water source length hard pump usually attached foreign objects water pulled damaging pump pond stream body water appropriate device surface mud air fire engine pump drafting solid tank pool safely rest mud fire engine pump united_kingdom official guidance use ropes weight order avoid putting sideways ensure minimum water surface prevent air support packing necessary crosses wall prevent air pocket formed
Hard suction hose