Waa maxay SCH (Lambarka Jadwalka)?

SCH waxay u taagan tahay "Jadwalka," kaas oo ah nidaam lambareed oo loo isticmaalo Nidaamka Tuubooyinka Heerka Ameerika si loo muujiyo dhumucda derbiga. Waxaa loo isticmaalaa iyadoo lala kaashanayo dhexroorka magacaaban (NPS) si loo bixiyo ikhtiyaarro dhumucda derbiga oo caadi ah oo loogu talagalay tuubooyinka cabbirro kala duwan leh, fududeynta naqshadeynta, wax soo saarka, iyo xulashada.

 

SCH si toos ah uma tilmaamayso dhumucda derbiga laakiin waa nidaam qiimeyn ah oo u dhigma dhumucda derbiga gaarka ah iyada oo loo marayo miisaska caadiga ah (tusaale ahaan, ASME B36.10M, B36.19M).

 

Marxaladaha hore ee horumarinta caadiga ah, qaacido qiyaas ah ayaa la soo jeediyay si loo qeexo xiriirka ka dhexeeya SCH, cadaadiska, iyo xoogga walxaha:
SCH ≈ 1000 × P / S
Halkee:
P - Cadaadiska naqshadeynta (psi)
S - Cadaadiska la oggol yahay ee walaxda (psi)

 

Inkasta oo qaacidadani ay muujinayso xiriirka ka dhexeeya naqshadaynta dhumucda derbiga iyo xaaladaha isticmaalka, xulashada dhabta ah, qiimayaasha dhumucda derbiga ee u dhigma waa in wali laga tixraacaa jadwalka caadiga ah.

 

Asalka iyo Heerarka La Xiriira ee SCH (Lambarka Jadwalka)

Nidaamka SCH waxaa asal ahaan aasaasay Machadka Heerarka Qaranka ee Mareykanka (ANSI) ka dibna waxaa qaatay Bulshada Injineerada Farsamada ee Mareykanka (ASME), oo lagu daray taxanaha heerarka B36, si loo muujiyo xiriirka ka dhexeeya dhumucda derbiga tuubada iyo dhexroorka tuubada.

 

Waqtigan xaadirka ah, heerarka caadiga ah ee la isticmaalo waxaa ka mid ah:

ASME B36.10M:
Waxaa lagu dabaqi karaa tuubooyinka birta kaarboonka iyo birta daawaha leh, oo daboolaya SCH 10, 20, 40, 80, 160, iwm.;

ASME B36.19M:
Waxaa lagu dabaqi karaa tuubooyinka birta aan miridhku lahayn, oo ay ku jiraan taxane fudud sida SCH 5S, 10S, 40S, iwm.

 

Soo bandhigidda tirooyinka SCH waxay xallisay arrinta matalaadda dhumucda derbiga ee aan iswaafaqsanayn ee dhexroorka magacaaban ee kala duwan, taasoo keentay in la mideeyo naqshadaynta dhuumaha.

 

Sidee loo matalaa SCH (lambarka jadwalka)?

Heerarka Mareykanka, dhuumaha waxaa badanaa lagu tilmaamaa qaabka "NPS + SCH," sida NPS 2" SCH 40, taasoo tilmaamaysa dhuumaha dhexroorkoodu yahay 2 inji iyo dhumucda derbiga oo u dhiganta heerka SCH 40.

NPS: Cabbirka tuubada magacaaban, oo lagu cabbiray inji, kaas oo aan ahayn dhexroorka dibadda ee dhabta ah laakiin waa aqoonsi cabbireed oo heer warshadeed ah. Tusaale ahaan, dhexroorka dibadda ee dhabta ah ee NPS 2" waa qiyaastii 60.3 milimitir.

SCH: Heerka dhumucda derbiga, halkaas oo tirooyin sare ay muujinayaan derbiyo qaro weyn, taasoo keenta xoog tuubooyin oo weyn iyo iska caabin cadaadis.

Iyada oo la adeegsanayo NPS 2" tusaale ahaan, dhumucda derbiga ee lambarrada SCH ee kala duwan waa sidan soo socota (cutubyada: mm):

SCH 10: 2.77 mm
SCH 40: 3.91 mm
SCH 80: 5.54 mm

 
【Qoraal Muhiim ah】
— SCH waa magac-bixin kaliya, ee maaha cabbir toos ah oo dhumucda derbiga ah;
— Tuubooyinka leh magac SCH oo isku mid ah laakiin cabbirrada NPS ee kala duwan waxay leeyihiin dhumuc derbi oo kala duwan;
— Inta uu heerka SCH sareeyo, darbiga tuubada ayaa dhumucdiisu sii weynaataa, heerka cadaadiska ee khuseeyana wuu sii kordhayaa.