Fɔ pik bitwin wan polyɛsta flat sling ɛn wan naylon flat sling nɔto tin fɔ se wan 'bɛtɛ' pas di ɔda wan—i dipen ɔl pan di aplikeshɔn ɛnvayrɔmɛnt. di tu mεtirial dεm de sheb di sem wok lod limit εn tεmprachכ rεnj (-40°C to 100°C) כnda EN 1492-1 , bכt dεn difrεn bכku pan εlongeshכn, kεmikכl rεsistεns, εn mכsichכ rεspכns. Naylon de strɛch 6–10% pan rayt lod ɛn i de rɛsist alkali bɔt i de pwɛl bay asid . poliεsta de strεch כnli 3–4% εn i de rεsist asid bכt i de pwεl bay alkali . Dis gayd de gi wan ditayl kɔmpiashɔn fɔ ɛp injinia ɛn riging pɔshɔnal dɛn fɔ pik di rayt flat sling matirial fɔ dɛn patikyula opareshɔn kɔndishɔn dɛn.
Fɔ no ustɛm fɔ riples flat slings impɔtant fɔ rigging sefty ɛn regulatory compliance. Di industri standad ASME B30.9 ɛn EN 1492-1 de difayn tu lɛvul fɔ inspekshɔn—frɛkuɛnt (de ɔ bifo yu yuz am) ɛn ɔltɛm (ɛvri ia ɔ sɛmi-ɛni ia)—ɛvri wan gɛt spɛshal krayteria fɔ no ustɛm dɛn fɔ pul sling na savis. Dis gayd de ɛksplen di difrɛns bitwin inspekshɔn we dɛn kin du ɔltɛm ɛn we dɛn kin du wan wan tɛm, i de gi ditayla chɛklist fɔ ɛni wan pan dɛn, ɛn i de sho di krayteria fɔ ritaia we kin mek pɔsin chenj sling. Fɔ rigging supavaysa, sefty manija, ɛn ɔpreshɔn, dis na prɛktikal rɛfrɛns fɔ mentɛn wan sef sling invɛntari.
Flat sling nɔ jɔs de es lod—i de protɛkt am. Di wayd, flat wɛb sɔfays de sheb di lod in wet oba wan big eria, we de ridyus di prɛshɔn bad bad wan na ɛni wan pɔynt. Dis na di fawndeshɔnal fizik prinsipul biɛn flat sling: Prɛshɔn = Fɔs ÷ Ɛria. We dɛn de mek di say we dɛn kin kɔntakt mɔ, dɛn kin mek di flat sling dɛn nɔ pwɛl di say we dɛn de, dɛn kin dent, ɛn krɔs—we kin mek dɛn lɛk fɔ es di tin dɛn we dilik, we dɔn dɔn, ɔ we kin pwɛl izi wan. Dis gayd de ɛksplen di fizik fɔ prɛshɔn distribyushɔn, kɔmpia flat sling to ɔda liftin sɔlvishɔn, ɛn gi prɛktikal gayd fɔ pik di rayt sling wit fɔ yu aplikeshɔn.
Di 1/10 rul na wan stret bɔt impɔtant ritayayeshɔn krayteria fɔ flat sling: we abrasive wear ridyus di webbing width bay 1/10 ɔ mɔ, di sling fɔ kɔmɔt na savis. Dis rul de spɛsifa insay EN 1492-1 ɛn ASME B30.9 no am as di men indikɛtɔ fɔ wɛr pasmak. Dis gayd de ɛksplen wetin di 1/10 lɔ min, aw fɔ mɛzhɔ di wɛb wit kɔrɛkt wan, wetin mek dɛn pik dis trɛshɔld, ɛn aw fɔ yuz am we dɛn de du inspekshɔn ɛvride. Fɔ di wan dɛn we de oba di rig ɛn di wan dɛn we sabi bɔt sef, if dɛn ɔndastand dis simpul lɔ, dat kin mek dɛn nɔ yuz sling dɛn we dɛn dɔn wɛr we denja.