安全阀反力计算
䰘 (
䌘 䰘
ㅵ㋏Ё䯔䮼 ǃ ⱘ 䕑
( 䯔䮼 䗳 䯁
䆕䆹ㅵ㋏Ёⱘㅵ䘧 ㅵ䘧 ӊ㛑 ℷ Ϟⷁ ㅵ㋏ “∈䫸”⦄䈵 ˈ
ⱘ 催 DŽ ˈ䖬 䆕ㅵ䘧 䎇 ⱘ ҹ 䴲 㸵 ⱘ⫼DŽ ⊶䗴 ⱘㅵ䘧 ˈ䆒䅵Ҏ г ㅵ䘧㒧 㕂 䗖 ҹ㗗㰥DŽ
ҹϟ ⊩ҙ㗗㰥䯔䮼 䯁 ㅵ㋏Ёⱘ 催ˈ ℸѻ⫳ⱘㅵ㋏Ёⱘ ㅵ㋏ 㒣 ⱘ DŽ䆹 ⊩ 䅵 ⊶ ㅵ㋏ѻ⫳ⱘ DŽ䆹 ⊩ ⱘ䅵ㅫ㒧 ⱘDŽ (E.1)䅵ㅫDŽ( ⒵䎇ҹϟϡㄝ Ӯ ⦄“∈䫸”⦄䈵˖
T
Ё˖
T —— 䯔䮼ⱘ 䯁 䯈ˈ ԡЎ⾦(s)˗
L —— ㅵ㋏ⱘ䭓 ˈ ԡЎ㉇(m)˗2L X ……………………………………………(E.1)
µs ——ㅵ䘧Ё⌕ԧⱘ 䗳ˈ ԡЎ㉇↣⾦(m/s)ˈ ㅵ䘧㾚Ў ˈ ҹ (E.2)ㅫ ˖
Xs
㗗㰥ㅵ䘧 ⱘ ˈµs ҹ (E.3)䅵ㅫ˖E Uu103 ……………………………………(E.2)
Xs U¨¨§1D ·¸ ¸E o T e E ¹u103 ………………………………(E.3)
E o ——⌕ԧⱘԧ⿃ 䞣ˈ ԡЎ (MPa)˗
²—— ㅵ䘧Ё⌕ԧⱘ ˈ ԡЎ ↣ゟ ㉇(kg/m3) ˗
E —— 䩶ㅵ ⏽ ϟⱘ 䞣ˈ ԡЎ (MPa)DŽ
( 催 ƸS ҹ ( 䅵ㅫ˖
'p Xs xXxUu10 6 (MPa) …………………………(E.4)
Ё˖
µ —— ㅵ䘧Ё⌕ԧⱘ 䰙⌕䗳ˈ ԡЎ㉇↣⾦(m/s)DŽ
( 䴲 㸵 ⱘ䅵ㅫ
ϔ↉Ⳉㅵ䘧ˈ 䴲 㸵 F ҹ (E.5)ǃ (E.6)䅵ㅫ˖ ㅵ䘧˖
SxD 2xV xL F x'p u10 3 (N)…………………………(E.5) 2xV a xO
ㅵ䘧˖
SxD 2xV xL x'p u10 3 (N)…………………………(E.6) F V a xO
Ё˖
V m —— 䯔䮼 䯁䖛Ёⱘ 催䗳⥛ˈ ԡЎ ㉇↣⾦(m2/s)˗
V a —— 䯔䮼 䯁䖛Ёⱘ 䗳⥛ˈ⫼ 䯁 䯈䰸䯔䮼䴶⿃㗠 ˈ ԡЎ ㉇↣⾦(m2/s)˗¬üü ⊶ⱘ⊶䭓(㾕 E.7)ˈ ԡЎ㉇(m)DŽ
O Xs xT …………………………………………(E.7)
( ⊘ 䯔ⱘ
⊘ 䯔 ˈ⇨ԧⱘ Ӯ Ϣ䯔䮼Ⳍ䖲ⱘㅵ䘧ѻ⫳ϔ ⫼ ˈ䆹 ⫼ ㅵ䘧ⱘ ⱘ DŽ
⊘ 䯔 ⱘ ⳟ Ϣ䯔䮼䖲 ⱘ ㅵ ㅵ䘧ѻ⫳ⱘϔϾ 䚼⫼ ˈ䆒䅵 ㅵ䘧䆒䅵 ⱘ 㕂 㗗㰥䖭Ͼ ㋴DŽ ㅵ䘧 Ϟ 㺙 Ͼ⊘ 䯔ˈ 㗗㰥 Ͼ⊘ 䯔 ⱘ㘨 DŽ
䆒䅵Ёˈ㗗㰥⊘ 䯔 ⱘ ˈ 䅸Ўㅵ䘧Ёⱘ⠽ ⇨Ё ˈҢ㗠䞛⫼䕗ㅔ ⱘ䴭 ⊩ˈ ҹϔ 㥋䕑㋏ 䅵 DŽ
䗮亢ㅵ ⇨Ё ⠽ ⱘ 㓁 ⫼ ˈ ԡЎ⠯乓(N)ˈ (E.8) 䅵ㅫ˖
F r M xXe p e p a xA …………………………………(E.8)
Ё˖
M üü⠽ ⱘ䋼䞣⌕䗳ˈ ԡЎ ↣⾦(kg/s)˗
µe —— ⠽ ⊘ 䯔ⱘ 䗳⥛ˈ ԡЎ㉇↣⾦(m/s)˗
p e —— ⊘ 䯔 ⱘ ˈ ԡЎ (MPa)˗
p a —— ⇨ ˈ ԡЎ (MPa)˗
A —— ⊘ 䯔 ⱘ⠽ ⌕ 䴶⿃ˈ ԡЎ ↿㉇(mm2) DŽ
Ўњ䅵 ⊘ 䯔 ⶀ䯈 ⱘ ˈ佪 (E.9) 䅵ㅫ⊘ 䯔ⱘ
(s)˖T ˈ ԡЎ⾦
m xh 32ST ………………………………………(E.9) 1000uEJ Ё˖
m —— ⊘ 䯔㒘ӊ( ⊩ ㄝ) ⱘ䋼䞣ˈ ԡЎ (kg)˗
h —— Џㅵ㸼䴶㟇 ㅵЁ 㒓ⱘ䎱⾏( 䚼 E.1 ⼎) ˈ ԡЎ↿㉇(mm)˗
J —— ⊘ 䯔䖯 ㅵⱘ ⶽˈmm 4DŽ
a —— ⫼ ˗
b —— 䯔䮼 ㅵⱘЁ 㒓˗
c —— 䯔䮼ⱘ䖯 ㅵ˗
d —— ЏㅵDŽ
( ⊘ 䯔ⱘ 㕂
ˈ⫼⊘ 䯔 䰙 䯈t (Ң䯔䮼 䯁 ⫼ⱘ 䯈) Ϣ⊘ 䯔 T П↨ˈҢ 䚼 E.2Ё 㥋䕑㋏ Z dlf DŽ
⊘ 䯔 ⶀ䯈ⱘ ˈ ԡЎ⠯乓(N)ˈ ҹ (E.10)䅵ㅫ˖
F d F r xZ dlf ……………………………………
(E.10)
( 㥋䕑㋏ =GOI