!"#$%&'#$%&
!"#$%&'#$%&
=
(')*
=
!
""#$
+ !,-./'#0%&1%& 2%
+ !,-./'#0%&1%& 2%
345%67"-8"'1.9:1%& 2%
345%67"-8"'1.9:1%& 2%
;<=Σ<
>
?7
ε
%
=
&'()*
+@ABCD
+@ABCD
+@ABCDE""F
+@ABCDE""F
υµ
ρ
++
,- ==
&'()*
./012)3'45
6
789:',-;<=<>
6
789?0@'<=<>;,-;A>
B
6
7891C',-DA>
B
G%&H:IJ"KL.9:.M%N1AO-%(K N*E FGCHI?0
J1)I$G0
+P%&.Q-"R%&
+P%&.Q-"R%&
<
$
K
#
1
LM =
Dấu (-) có ý nghĩa là sự ma sát của các dòng
nguyên tố sẽ giảm dần từ thành ra tâm ống
./(1N1?5OPC+5CG
−=
<
3
1
1
A
$Q
RR
G
$
#
.($ S +T 8 9 :U ? 5 O PC +5 C -3 V
O1P3&WB=*
+P%&.Q-"R%&E""F
+P%&.Q-"R%&E""F
•
X5C1P23 8JPY
G
$
#
<
$Q
R
+ =
•
WZGC7189:JPY
,-,-
[B A
==
λ
\ZGCO]@2S
4ZC
•
WZGCZF@αJPY
<
\
=
+
\
\
=
R
^ =
∫
=
++P%&.Q-,6'5
++P%&.Q-,6'5
_01`λ+a?0@+ +a91CV2$PY
IZ$G
b89O'J0c!C&8
1"*
++P%&.Q-,6'5E""F
++P%&.Q-,6'5E""F
b89O''J0c!&8
0$*
+3P%&.Q-S1
+3P%&.Q-S1
dG891COPC-3?5
+3P%&.Q-S1E""F
+3P%&.Q-S1E""F
./2&WBe*+5C0TO(GIGPZJ+ 0
!U3( WZGCZFαfA+ ZGC$G071
*
&,-Ug
ε
=λ
+345%67.9:1%&Q%#T%&KU% P%&.Q-
+345%67.9:1%&Q%#T%&KU% P%&.Q-
.@c!'NC εUTO$hO)
@c! ∆
•
K4TO∆Dε 1"IUi
1"
•
K4TO∆;ε 0$IUi
0$
+3+Q%'V(( -
+3+Q%'V(( -
+335"N1 W%&"X%"Y".Z.[5'#0%&1%&"#0%&&\]
+335"N1 W%&"X%"Y".Z.[5'#0%&1%&"#0%&&\]
P%&.Q-.(^]'5"%&5"_45""
−=ξ
A
<
\
\
AeU>
P%&.Q-7TS5%&'5"%&5"_45"7T
<
A
<
\
\
AeU>
−=ξ
+335"N1 W%&"X%"Y".Z.[5'#0%&1%&"#0%&&\]E""F
+335"N1 W%&"X%"Y".Z.[5'#0%&1%&"#0%&&\]E""F
P%&.Q-1%1%&`&).α
STKa."O('5')%&7T.9:I:%.\% P%&K#K#b%&
3ccc@C4def
3ccc@C4def
3e%& 2%
3e%& 2%
0):'Cj
•
`0OG
•
`Z@
•
Eh13$1V $+Z
kj4S3)l
gh Z*-3)lmn&\$-1K3o1G
pG-q\Kop*'JTCjJ-3r-Gs+T
t'JT/h4Tq'uZvrw
Đặc biệt tiêu chuẩn ANSI quy định như sau: Mã số ống dẫn:
Là tiêu chuẩn hóa theo khả năng chịu áp suất
3+6.]Zi8%ij7Ik1%& 2%
3+6.]Zi8%ij7Ik1%& 2%
6.]Zi8%'#0%&1%&&V71i3#N#CC#Hx#H.#
QZ#13 &Q-$2WBA<*
l%& Z%&NO3GI+5 UGyHU4
(+ 5
33m%& Z%&.6.K(WI:%
33m%& Z%&.6.K(WI:%
mC?ZH@$++ 8
?+&WBA=*
33m%& Z%&.6.K(WI:%E""F
33m%& Z%&.6.K(WI:%E""F
03S+VzO
q+y
Pq+'$
q+:
3h%"(6%1%& 2%
3h%"(6%1%& 2%
%VCjc$0S4G
34#0%&1%&N(%&N(%&
34#0%&1%&N(%&N(%&
3+4#0%&1%&%1"/]
3+4#0%&1%&%1"/]
3h%"(6%1%& 2%E""F
3h%"(6%1%& 2%E""F
334#0%&1%&Sn%6%
334#0%&1%&Sn%6%
38"1%&o1"#k
38"1%&o1"#k
3h%"(6%1%& 2%E""F
3h%"(6%1%& 2%E""F
3p8"1%&ih%
3p8"1%&ih%
qrsc
qrsc
q!.JZGCα+ ZGC$G0λP4!'ZG
{f[|G, fA>>$$, ρf}e>'|$
=
, µf>U<[~
q!&Q
qrsc
qrsc
q!+.JZGCα+ ZGC$G0λP4!'ZG
+f>U=$|GUf}e$$U
ν
f>U<o
q!&Q
qrsc
qrsc
q!&Q
qrsc
qrsc
q!.J1I3SC2+•GU
P4λf>U>=#+fA$|G#
<
fA>>$$#
A
f<>>$$#
fA>$|G
<
#
?
f€$
q!&Q[!"J]