Nhwɛsoɔ: 845 Ɔkyerɛwfoɔ: Site Editor Bere a wɔde tintimii: 2023-12-18 Mfiase: Beaeɛ
So ɛhaw wo sɛ wonte NPSM, NPTF, NPT, ne BSPT nhama ase? Saa asɛm yi bɛkyerɛ wo kwan wɔ nteaseɛ a ɛkɔ akyiri mu wɔ saa nhama yi ho, na akyerɛ wo sɛdeɛ wobɛhyehyɛ no aka nneɛma a ɛho hia a wobɛsusu ho.
NPT gyina hɔ ma National Pipe Tapered . Ɛyɛ asaawa bi a ɛyɛ teateaa a wɔde ka paipu ne nneɛma a wɔde hyɛ mu ho. Nea ɛsɛ sɛ wuhu ni:
l Tapered Threads : NPT nhama no yɛ teateaa a ɛyɛ nsateakwaa 1/16 wɔ nsateakwaa biara mu, a ɛkyerɛ sɛ ɛyɛ teateaa wɔ n’awiei.
l Thread Standards : Wɔdi ANSI/ASME B1.20.1 gyinapɛn no akyi.
l Thread Angle : Nhama no wɔ 60° flank angle.
l Sealing Efficiency : Wɔnam mfiri a wɔde hyɛ mu so na ɛyɛ interference fit a ɛda asaawa no anim ne ntini ntam .
NPT nhama wɔ baabiara wɔ nhyɛso nhyehyɛe ahorow mu . Wɔde di dwuma de hwɛ hu sɛ wɔde nsɔano a nsuo ntumi nkɔ mu wɔ:
l Nsuo ne Mframa a Wɔde Kɔ : Nsuo afiri a ɛde nsuo, ngo, anaa gas kɔ.
l Pressure Calibration Systems : Nneɛma a wɔde susuw nhyɛso.
Nnwumakuw a wɔde NPT nhama di dwuma no bi ne:
l Nneɛma a wɔyɛ
l Kar ho adwumayɛ
l Ahunmu mu nneɛma
Sɛ worehyɛ NPT threads a, di nneyɛe pa yi akyi:
1. Fa PTFE Tape di dwuma : Fa PTFE tape (Teflon) kyekyere ɔbarima asaawa no ho na ama nsɔano no atu mpɔn.
2. Don’t Over-Tighten : Sɛ wohyɛ no den dodo a, ebetumi ama woanya galling , baabi a nhama no sɛe.
3. Hwɛ sɛ Leaks : Bere nyinaa sɔ nkitahodi no hwɛ sɛ leaks anaa.
Nneɛma a wɔtaa de di dwuma no bi ne:
l Connecting Pipes : Te sɛ nea ɛwɔ wo fie nsu ho nhama mu.
l Fittings : Te sɛ elbows anaa tees a ɛboa ma wɔsesa kwan a ɛkɔ nsuo no mu.
l Leak-Free Connection : Wɔayɛ no sɛnea ɛbɛyɛ a wɔbɛma ayɛ nsɔano a ɛyɛ den.
l Wogye tom kɛse : NPT ne gyinapɛn a ɛwɔ nnwuma pii mu.
l Asiane a ɛwɔ hɔ sɛ wobɛkyekyere no dodo : Ɛyɛ yiye sɛ wobɛsɛe nhama no.
l Ebia Ɛbɛhia Sealant : Ɛtɔ da bi a, sealant foforɔ ho hia na ama wɔahwɛ sɛ seal no ntumi nkɔ mu.
l Wɔayɛ NPTF , anaa National Pipe Taper Fuel , a wɔsan frɛ no Dryseal American National Standard Taper Pipe Thread , sɛnea ɛbɛyɛ a ɛbɛma nsɔano a ɛyɛ den a enhia sɛ wɔde ade foforo a wɔde kata so.
l NPTF nhama no wɔ nhyehyɛɛ soronko kakra a ɛma kwan ma wɔde mfiri di nkitaho a wɔmfa PTFE teyp anaa nneɛma afoforo a wɔde hyɛ mu nni dwuma, ɛnte sɛ NPT nhama a ɛtaa hwehwɛ.
Kae sɛ, NPT fa sɛ wɔbɛbɔ tapered pipe thread connection a wotumi de ho to so na wɔde di dwuma kɛse. Sɛ́ ebia woreyɛ kar ho adwuma anaasɛ woresiesie nsu a ɛretu wɔ fie no, sɛ wunim NPT nhama ho asɛm a, ɛboa wo ma wunya nkitahodi pa.
NPTF nhama a wɔsan frɛ no Dryseal American National Standard Taper Pipe Thread , di ANSI B1.20.3 gyinapɛn ahorow akyi. Saa nhama yi te sɛ NPT nanso wɔayɛ ama nsɔano a eye. NPTF nhama wɔ 60° flank angle na ɛyɛ mfiri nsɔano denam interference fit a ɛda nhama no crests ne ntini ntam so. Eyi kyerɛ sɛ nhama no bom ma ɛyɛ nsɔano a emu yɛ den a enhia sɛ wɔde nsɔano foforo ka ho.
Bere a NPT ne NPTF nhama no yɛ pɛ no, ɛsono sɛnea wɔayɛ . Wɔayɛ NPT nhama wɔ ANSI/ASME B1.20.1 ase , na ebia ebehia PTFE teyp anaa nneɛma afoforo a wɔde hyɛ mu na ama wɔahwɛ ahu sɛ nkitahodi a enni nsu mu . Ɔkwan foforɔ so no, wɔyɛ NPTF nhama, a ɛdi ANSI B1.20.3 akyi no , ma ɛyɛ nhama a ɛyɛ den na ɛyɛ nsɔano a nneɛma foforɔ biara nni mu. Wɔnam nhyehyɛe bi a ɛma asaawa no atifi ne ntini no bom, na ɛma ɛyɛ nsɔano a nsu ntumi nkɔ mu so na ɛyɛ eyi.
In the world of fuel and gas , NPTF nhama yɛ nea wɔpaw. Wɔayɛ no sɛnea ɛbɛyɛ a ɛbɛyɛ nsɔano a nsu ntumi nkɔ mu a ɛho hia kɛse wɔ nhyɛso nhyehyɛe ahorow mu . Saa nhyehyɛe ahorow yi ntumi ntua nsu a ɛtwetwe, efisɛ ketewaa mpo betumi ayɛ asiane. Wɔde NPTF nhama di dwuma wɔ nhyɛso calibration nhyehyɛe ne afã horow a nsu anaa mframa no ahotew ne ne mudi mu kura ho hia kɛse.
Wɔtaa hu NPTF nhama wɔ mmeae a ɛho hia sɛ wɔde nsɔano a nsuo ntumi nkɔ mu , na wɔmpɛ sɛ wɔde nsɔano biara gu mu. Nanso, bere a ɛtɔ mmere bi a wobetumi afra NPTF ne NPT nhama no, ɛnyɛ bere nyinaa na eyi yɛ nea ahobammɔ wom anaasɛ etu mpɔn. Wobetumi de NPTF nhama abɔ NPT nhama mu, nanso ebia akyi no rensɔw ano yiye efisɛ wɔayɛ NPTF sɛnea ɛbɛyɛ a ɛbɛbɛn. Ɛho hia sɛ wobɛhwɛ sɛnea ɛne ne ho hyia ansa na woafrafra na woakwati nsɛm te sɛ galling anaasɛ nsɔano a ɛmfata.
NPSM nhama yɛ nhama a ɛyɛ tẽẽ a wɔde fa paipu mu . Wɔdi ANSI/ASME B1.20.1 gyinapɛn akyi. Wɔayɛ saa nhama yi sɛnea ɛbɛyɛ a wɔde mfiri bɛka ho mmom sen sɛ wɔbɛyɛ nsɔano. Wɔn wɔ 60° flank angle na wɔayɛ sɛ wɔde gasket anaa O-ring bedi dwuma de ayɛ nkitahodi a nsuo nkɔ mu.
Nsɛm titiriw a ɛfa NPSM nhama ho: - Wɔyɛ parallel , a ɛkyerɛ sɛ diameter no yɛ pɛpɛɛpɛ. - NPSM nhama no nnyɛ taper te sɛ NPT (National Pipe Tapered) nhama. - a wode di dwuma de ye mfiri nkitahodi . - sealing efficiency firi gaskets mu, ennye threads no ankasa.
Wɔtaa hu NPSM nhama wɔ hydraulic nhyehyɛe ahorow mu a nsɔano a nsu nkɔ mu ho hia kɛse. Wɔyɛ adwuma yiye wɔ nhyɛso nhyehyɛe te sɛ nhyɛso calibration nhyehyɛe mu . Female Pipe Swivel fittings no abu so wɔ NPSM nhama mu, na ɛma ɛyɛ mmerɛw sɛ wɔde besisi mmeae a ɛyɛ den.
Nneɛma a ɛfata a wɔde di dwuma no bi ne: - Baabi a mfiridwuma mu nsɔano ho hia sen asaawa nsɔano. - nhyehyeee a ehia se wotaa paapae mu na wosan boaboa ano. - se wode gasket anaa O-ring di dwuma a , wope sene thread sealant.
Ɛtɔ mmere bi a wobetumi de NPSM afrafra NPTF (National Pipe Taper Fuel), a wɔsan frɛ no Dryseal American National Standard Taper Pipe Thread . Sɛnea wɔde toto ho ni:
l NPTF nhama no sɛnea ɛbɛyɛ a ɛbɛma Wɔayɛ nsɔano a nsuo ntumi nkɔ mu a enhia sɛ wɔde nsɔano foforɔ bɛka ho. Wɔma interference fit ba asaawa no atifi ne asaawa ntini no ntam.
l NPSM nhama hia gasket anaa O-ring na ama wɔahwɛ sɛ nkitahodi a nsuo ntumi nkɔ mu.
l NPSM ntumi sesa NPTF anaa NPT esiane thread gyinapɛn ahorow nti.
Wɔbu NPSM nhama sɛ ɛsom bo sɛ ɛyɛ adwuma yie wɔ nsɔano mu berɛ a wɔde a ɛfata di dwuma no mfiri nsɔano . Wɔde di dwuma kɛse wɔ: - Nsuo ne gas a wɔde kɔ baabi foforɔ dwumadie mu. - nnwuma a ehia mfiri nkitahodi a wotumi de ho to so.
Nnwuma mu dwumadie bi ne: - Nsuo ne nsuo fĩ a wɔde yɛ adwuma. - a ɛyɛ mframa nhyehyɛe. - a wode srade gu mu.
Sɛ yɛka BSPT nhama ho asɛm a , yɛrekɔ wiase a nsu afiri ne nkitahodi ahorow a ɛho hia ma nsu ne mframa a wɔde kɔ baabi foforo wom mu . BSPT gyina hɔ ma Britania Standard Pipe Taper . Ɛyɛ asaawa bi a ɛyɛ teateaa a wɔde yɛ nsɔano a nsu nkɔ mu . Wɔakyerɛkyerɛ saa gyinapɛn yi mu wɔ nkrataa te sɛ BS 21 ne ISO 7 mu.
BSPT nhama yɛ soronko. Wɔn wɔ 60° flank angle na wɔyɛ tapered, a ɛkyerɛ sɛ wɔyɛ teateaa bere a wɔkɔ akyiri no. Eyi yɛ soronko wɔ NPT nhama , a ɛno nso yɛ teateaa nanso ɛwɔ nhama a ɛyɛ 60° a wɔde di dwuma wɔ Amerika, sɛnea ANSI/ASME B1.20.1 kyerɛkyerɛ mu no.
Afei, momma yɛmfa BSPT ntoto NPTF ho . NPTF, anaa National Pipe Taper Fuel , a wɔtaa frɛ no Dryseal American National Standard Taper Pipe Thread , sɛnea ANSI B1.20.3 kyerɛ no , wɔayɛ ama nsɔano a ɛyɛ den sen NPT. Ɛyɛ eyi denam interference fit a ɛba asaawa no atifi ne asaawa ntini ntam no so . BSPT mfa ne ho nto saa fit yi so mma nsɔano. Mmom no, ebia ebehia sɛ wɔde asaawa a wɔde siw ano te sɛ PTFE tape (Teflon) anaa gasket na amma nsu ankɔ mu.
Wɔde BSPT nhama di dwuma kɛse wɔ United States akyi, titiriw wɔ aman a wodi Britania mfiridwuma gyinapɛn ahorow akyi no mu. Wɔtaa hu wɔn wɔ nhyɛso nhyehyɛe ne nhyɛso calibration nhyehyɛe mu . a wotumi yɛ mfiri nsɔano no Tumi ma wɔfata ma amanaman ntam nneɛma pii.
Sɛ yɛhwɛ BSPT ka nhama ahorow afoforo te sɛ NPSM (National Pipe Straight Mechanical) ne BSPP (British Standard Parallel Pipe) ho a , yehu sɛ BSPT yɛ nea wɔde yɛ nkitahodi a enni nsu mu wɔ nhama a ɛyɛ teateaa mu, bere a NPSM ne BSPP yɛ nhama a ɛyɛ tẽẽ de . BSPT nhama yɛ mfiri nkitahodi a enhia bonded ring seal anaa O-ring , ɛnte sɛ BSPP a ebia ebehia eyinom ma sealing.
BSPT nhama yɛ kɛse ma tebea horow a wuhia nsɔano a ɛyɛ den a nsu ntumi nkɔ mu a akwan afoforo a wɔfa so nsɔano no nyɛ den. They’re simpler to use than NPTF threads , a ɛhwehwɛ sɛ wɔyɛ nhyɛso calibration pɛpɛɛpɛ na wɔakwati nsɛm te sɛ galling anaasɛ ɔsɛe a efi over-tightening mu.
Sɛ yɛka thread fittings te sɛ NPSM, NPTF, NPT, ne BSPT ho asɛm a, ne nyinaa fa sɛnea wɔde connect na seal pipes ho. Saa thread gyinapɛn ahorow yi boa yɛn ma yɛhwɛ hu sɛ nneɛma hyia yiye. Fa no sɛ LEGO blocks – ɛsɛ sɛ ɛne ne ho hyia pɛpɛɛpɛ na ama wɔabata ho.
l NPSM ne NPS wɔ nhama a ɛyɛ tẽẽ, a ɛkyerɛ sɛ ɛnyɛ den bere a wɔde skru hyɛ mu no.
l NPT , NPTF , ne BSPT yɛ nea wɔayɛ no teateaa. Eyi kyerɛ sɛ wɔyɛ den ampa, te sɛ funnel, a ɛboa ma nsu a ɛtwetwe no gyae.
Amerika Ɔman Gyinapɛn Asoɛe (ANSI) de mmara hyehyɛ saa nhama yi wɔ U.S. Sɛ nhwɛso no, ANSI/ASME B1.20.1 yɛ NPT nhama dea. Wɔka sɛnea ɛsɛ sɛ nhama no kɛse te, dodow a ɛwɔ nsateakwaa biako mu (ɛno ne nhama dodow), ne nsusuwii a ɛsɛ sɛ wonya kyerɛ yɛn.
Nneɛma a wɔde yɛ adwuma no ho hia kɛse. Nneɛma a wɔde hyɛ mu dodow no ara yɛ dade, te sɛ dade anaa kɔbere, efisɛ ɛyɛ den. Saa afã horow yi a wɔyɛ no di mmara a emu yɛ den akyi de hwɛ hu sɛ ahobammɔ wom na ɛbɛtra hɔ akyɛ. Eyi fa mmara sodi ho – te sɛ aduannoa ho nyansahyɛ bi a wobedi akyi de ato keeki a ɛyɛ pɛ bere biara.
l ANSI B1.20.3 ne AS 1722.1 y gyinapɛn ahorow bi a ɛkyerɛ sɛnea wɔyɛ nhama ma nhyɛso nhyehyɛe ahorow.
l Wɔ UK no, wɔde BS 21 ne ISO 7 di dwuma ma BSPT ne BSPP nhama.
Ɛsɛ sɛ wɔn a wɔyɛ no nso hwɛ hu sɛ wɔn nhama no betumi adi nhyɛso a ɛsɛ sɛ wɔyɛ no ho dwuma a ɛrentu anaasɛ ɛremmubu. Ɛhɔ na quality assurance ba.
Nhama no nsusuwii bi ne ɛnne nnyigyei (sɛnea nhama no ntam kwan ware) ne anim . nhama no Sɛ nhwɛso no, BSPT nhama wɔ 60° flank angle , a ɛyɛ nea ɛma ɛyɛ soronko no fã.
l Tolerances yɛ nsonsonoeɛ nketenkete a wɔma ho kwan wɔ nhama kɛseɛ ne ne nsɛsoɔ mu. Wɔte sɛ wiggle room a wɔde asinasin afrafra mu.
l Quality assurance kyerɛ sɛ wɔbɛhwɛ ɔfa biara mu ahwɛ sɛ ɛne gyinapɛn no hyia anaa. Ɛte sɛ nea ɔkyerɛkyerɛfo bi rema wo fie dwumadi no abasobɔde de ahwɛ ahu sɛ woanya mmuae no yiye.
Sɛ wopɛ seal a nsu nkɔ mu a , PTFE tape (Teflon) , gaskets , anaa O-rings adi dwuma de aka saa nhama yi ho. wobetumi de afã horow te sɛ Tapered threads te sɛ NPT ne BSPT taa tumi seal wɔ wɔn ankasa mu esiane wɔn nsusuwii nti – ɛyɛ den na ɛyɛ den bere a wɔde screwed ahyɛ mu no.
l NPT nhama no sɛ ɛnyɛ Wɔayɛ interference fit , a ɛkyerɛ sɛ ɛyɛ mfiri nsɔano denam nea wɔpiapia no so.
l NPSM nhama ne ɔbea paipu swivel yɛ adwuma – nut bi a ɛma wotumi de nkɔnsɔnkɔnsɔn gu so a wonkyinkyim paipu no nyinaa.
l NPTF nhama Ɛtɔ da bi a wɔfrɛ Dryseal American National Standard Taper Pipe Thread ɛfiri sɛ wɔayɛ sɛ wɔde bɛto mu a enhia nneɛma foforɔ te sɛ tape anaa paste.
Sɛ ɛba nhama a wɔde hyɛ mu a wɔde di dwuma wɔ nhyɛso nhyehyɛe mu so a , nsɛm a ɛkɔ akyiri no ho hia. Momma yɛnhwɛ sɛnea wɔde saa nhama yi di dwuma wɔ wiase ankasa mu.
NPT nhama wɔ mfiridwuma mu nneɛma a wɔde di dwuma wɔ ɔkwan a ɛkɔ akyiri so. Wɔtaa hu Sɛ nhwɛso no, ebia obi a ɔyɛ nhyɛso calibration systems de NPT fittings bedi dwuma esiane sɛ ɛne mfiri ahorow pii hyia nti.
Wɔayɛ NPTF nhama , a wɔsan frɛ no Dryseal American National Standard Taper Pipe Thread , sɛnea ɛbɛyɛ a ɛbɛyɛ nea ahobammɔ wom kɛse, a nsu ntumi nkɔ mu a enhia sɛ wɔde nhama foforo a wɔde kata so . Wɔde di dwuma wɔ mmeae a mfiri nsɔano ho hia kɛse, te sɛ mfiri a wɔde ma pɛtro mu.
NPSM nhama anaa National Pipe Straight Mechanical di dwuma ne Wɔtaa de ɔbea paipu a ɛdannan . Asɛm bi a wɔayɛ ho nhwehwɛmu betumi afa hydraulic nhyehyɛe a NPSM fittings ma ɛyɛ mmerɛw sɛ wɔbɛboaboa ano na wɔasiesie ho.
BSPT nhama , a ne 60° flank angle , abu so wɔ amanaman ntam dwumadie mu. Wɔtaa paw wɔn esiane wɔn nsɔano a etu mpɔn wɔ nsu ne mframa a wɔde kɔ baabi foforo nhyehyɛe mu nti.
Momma yɛnkyekyɛ nsonsonoe ahorow no mu:
l NPT vs. NPTF : Wɔn baanu nyinaa wɔ tapered pipe thread , nanso NPTF ma interference fit wɔ ntam thread crests ne thread roots , na ɛmma enhia sɛ wɔde sealant di dwuma.
l NPSM vs. NPT : NPSM wɔ paipu nhama a ɛyɛ tẽẽ na ɛhia gasket anaa O-ring na ama wɔanya nkitahodi a nsuo nkɔ mu . NPT nhama a ɛyɛ teateaa no nam nhama no ankasa so yɛ nsɔano.
l BSPT's Unique Position : BSPT nhama te sɛ NPT nanso ɛsono nhama no anim ne ne nne , ɛma ɛnyɛ nea wotumi sesa ne NPT fittings.
Nnwumayɛbea ho abenfo hyɛ nyansa sɛ fa PTFE teyp (Teflon) anaasɛ bonded ring seal a NPT fittings wom di dwuma na ama woahwɛ ahu sɛ nsɔano a nsu nkɔ mu . Wɔ NPTF fam no, ɛho hia sɛ wɔhwɛ hu sɛ wɔde wɔn ho hyɛ mu yiye na ama wɔanya ne dryseal dwumadi no so mfaso.
When working with BSPT connections , kae sɛ ɛne NPT anaa NPTF a enni adapters nhyia. Abenfoɔ tu fo sɛ hwɛ thread gyinapɛn te sɛ ANSI/ASME B1.20.1 ma NPT, ANSI B1.20.3 ma NPTF, anaa ISO 7 ne BS 21 ma BSPT na ama woahwɛ sɛ ɛfata yie.
Galling , anaasɛ asaawa a ɛsɛe, yɛ asiane a ɛwɔ saa nneɛma a wɔde hyɛ mu yi mu. Sɛnea ɛbɛyɛ a wubesiw ano no, nnyɛ den dodo da na di pressure systems ’ specifications akyi bere nyinaa.
Sɛ wode NPSM , NPTF , NPT , anaa BSPT fittings rehyɛ mu a, ɛho hia sɛ wudi akwankyerɛ pɔtee akyi na ama woahwɛ ahu sɛ nkitahodi a nsu nkɔ mu . Akwankyerɛ a ɛyɛ ntɛm ni:
l NPT ne NPTF : 1 .
l Fa PTFE teyp anaa asaawa a ɛfata a wɔde siw asaawa ano gu ɔbarima asaawa no so.
l Fa nsa kyekyere fitting no mu den, afei fa safe di dwuma ma dannan a etwa to no.
l Hwɛ yiye na woankyekyere no dodo, efisɛ eyi betumi asɛe nhama no.
l BSPT : 1 .
l Te sɛ NPT no, fa PTFE tape anaa thread sealant di dwuma.
l Fa ahwɛyiye kyekyere mu na ama woanya mfiri a wɔde bɛsɔ ano.
l NPSM : 1 .
l Wɔayɛ saa nhama yi sɛnea ɛbɛyɛ a ɛne ɔbea paipu swivel bɛbɔ.
l Fa gasket anaa O-ring di dwuma de siw ano.
l Mma nnyɛ den dodo, efisɛ ebetumi asɛe gasket no.
l Cross-threading : Ɛba bere a nhama no nhyia. Fa nsa fi ase bere nyinaa na asiw ano.
l Galling : Dade ne dade a ɛne wɔn ho wɔn ho di nkitaho no betumi de eyi aba. Fa srade di dwuma na ama woakwati.
l Tightening dodo : Ebetumi ama asaawa asɛe. Di pressure calibration systems akwankyerɛ akyi na ama woanya torque a ɛfata.
l Leakage : Sɛ leaks ba a, hwɛ sɛ out of roundness na hwɛ sɛ thread no hyɛ mu yie.
l Nhwehwɛmu Daa : Hwɛ sɛ sɛnkyerɛnne bi wɔ hɔ a ɛkyerɛ sɛ asɛe, asɛe, anaasɛ asɛe anaa.
l Ahotew : Ma nhama ho ntew. Efĩ betumi ama nsu a ɛretu.
l Sealant a wɔsan de di dwuma : Bere kɔ so no, sealants betumi asɛe. San fa di dwuma sɛnea ɛho hia.
l Fa Sie Yie : Fa nneɛma a wɔde sie no sie baabi a ɛhɔ yɛ kusuu na ɛhɔ tew.
Kae :
l NPT ne NPTF nhama no nam so yɛ nsɔano interference fit a ɛda nhama no atifi ne ntini ntam no .
l BSPT nhama no nam nhama no nkutoo so na ɛsɔ ano, a 60° flank angle no boa ma nsɔano no yɛ adwuma yiye.
l NPSM nhama de ne ho to mfiri nkitahodi so , a wɔtaa de gasket anaa O-ring ma ɛyɛ kɛse.
Sɛ ɛba thread fittings , ɛte sɛ ahodwiriwde. Afã biara hyia wɔ ɔkwan pɔtee bi so. NPSM (National Pipe Straight Mechanical) nhama yɛ tẽẽ na wɔayɛ ama mfiri nkwaa a ɛnyɛ nea ɛfata. NPT National Pipe Tapered) nhama no yɛ teateaa na ɛyɛ nsɔano a ɛyɛ den denam nea wɔde hyɛ mu kɔ akyiri bere a wɔde nkɔnsɔnkɔnsɔn gu mu so ( no . BSPT (British Standard Pipe Taper) nhama deɛ, wɔde yɛ nsɔano a ɛyɛ den wɔ nhyɛsoɔ nhyehyɛeɛ mu na ɛwɔ 55° flank angle, soronko wɔ 60° angle a wɔde di dwuma wɔ NPT threads mu no ho.
Afei, so wubetumi afrafra wɔn? Ɛnyɛ ankasa. Interchangeability nyɛ agodie a wopɛ sɛ wode thread fittings di. Ɛtɔ da bi a a wode bedi dwuma NPT ne NPTF no betumi ayɛ adwuma, nanso ɛnyɛ nea wɔahyɛ bɔ sɛ ɛbɛyɛ nkitahodi a enni nsu mu . Na BSPT nso ? Ɛyɛ asɛm soronko koraa esiane ne nhama a ɛyɛ soronko ne ne nne kɛse nti. Mfomso a ɛtaa ba? Sɛ yɛfa no sɛ wɔn nyinaa hyia a. Hwɛ gyinapɛn ahorow no bere nyinaa, te sɛ ANSI/ASME B1.20.1 ma NPT, na woakwati sɛ nsuo bɛtwetwe anaa ansɛe.
Enti, wobɛyɛ dɛn apaw nea ɛfata? Susuw adwuma no ho hwɛ. For fluid and gas transfer , nsɔano a nsuo ntumi nkɔ mu ne ade titiriw. Sɛ woreyɛ adwuma wɔ pressure systems , BSPT betumi ayɛ ɔkwan a wobɛfa so. Wɔ dwumadie a ɛhia sɛ wɔde mfiri nsɔano a enni sealant no, NPTF yɛ w’adamfo. Na wɔ mfiri nkitahodi a wobetumi atew mu ntɛmntɛm ho no, NPSM betumi ayɛ nea eye sen biara.
l Dɛn ne sealant pa?
PTFE teyp (Teflon) di dwuma de ka NPT nhama ho de boa ma wɔsɔw ano. Wɔtaa de
l Ɛsɛ sɛ mede skru kyekyere wɔn denneennen dɛn?
Kɔhwehwɛ interference fit —a ɛyɛ den sɛnea ɛbɛyɛ a asaawa no atifi ne ntini no bɛmia, nanso ɛnyɛ den araa ma wobɛyi nhama no.
l Na afã horow nso ɛ?
Kae sɛ, NPT ne NPTF wɔ 60° flank angle , na BSPT wɔ 55° angle.
l So metumi asan de saa fittings yi adi dwuma?
Ɛtɔ mmere bi a, nanso hwɛ yiye wɔ galling ho —bere a nhama asɛe na ɛbata ho no.
l Na sɛ ɛtwetwe nso ɛ?
Hwɛ sɛ asɛe anaa sɔ bonded ring seal anaa O-ring hwɛ ma ahobammɔ foforo.
Kae sɛ, sɛ wubenya nea ɛfata a, ɛte sɛ nea worepaw adwinnade a ɛfata ama adwuma no. Ne nyinaa fa nsɛm a ɛkɔ akyiri ho. Ma saa afotu yi ntra w’adwenem, na wobɛkɔ wo kwan so sɛ wubehu nhama a wɔde hyɛ mu yiye ama nkitahodi ahorow a nsu nkɔ mu.
Sɛ yɛka thread fittings te sɛ NPSM , NPTF , NPT , ne BSPT ho asɛm a, yɛreka afã horow a ɛboa yɛn ma yɛka paipu ne hoses bom ho asɛm. Saa nneɛma yi hwɛ hu sɛ yɛn nsu, gas, ne nneɛma afoforo fa nsu afiri mu a ɛrentu. Nea yɛasua ni:
l NPT yɛ bi tapered thread a wɔde di dwuma pii wɔ USA. Ɛma ɛyɛ den efisɛ nhama no yɛ nketewa wɔ n’awiei biako, te sɛ kɔne.
l NPTF , a wɔsan frɛ no Dryseal American National Standard Taper Pipe Thread , te sɛ NPT nanso wɔayɛ no sɛnea ɛbɛyɛ a ɛbɛyɛ nsɔano a ɛyɛ den mpo a nsu nkɔ mu a enhia nneɛma foforo te sɛ PTFE teyp.
l NPSM anaa National Pipe Straight Mechanical wɔ paipu nhama a ɛyɛ tẽẽ . Ɛyɛ papa ma mfiridwuma nkitahodi a wobetumi atetew mu na wɔasan de abom ntɛmntɛm.
l BSPT a ɛyɛ tiawa no British Standard Pipe Taper te sɛ NPT nanso ɛsono asaawa no anim ne ne nne . Ɛtaa ba mmeae a wɔde Britania gyinapɛn ahorow di dwuma.
Kae sɛ, sɛ wubenya nea ɛfata a, ɛkyerɛ sɛ wubehu wo nhama gyinapɛn ahorow na woapaw nea ɛfata ama wo nhyɛso nhyehyɛe ahorow no.
Wiase a ɛfa nhama a wɔde hyɛ mu ho no kɔ so sakra. Nea ɛreba no ni:
l Sealing efficiency reyɛ yie. Yɛrehwehwɛ akwan a yɛbɛfa so ayɛ nkitahodi a ɛyɛ super tight a enhia gaskets anaa O-rings foforo.
l Nneɛma a wɔde yɛ adwuma no nso renya nkɔso. Eyi kyerɛ sɛ fittings tumi di nhyɛso pii ho dwuma na ɛtra hɔ kyɛ.
l Abenfoɔ hyɛ nyansa sɛ yɛdi nnwumakuo ho nyansahyɛ akyi berɛ biara , te sɛ ANSI/ASME B1.20.1 a wɔde bedi dwuma ama NPT anaa ISO 7 ama BSPT, na ama wɔahwɛ sɛ biribiara fata yie.
