TCVN
TrEU
cHuAr.r
euoc'c
TCVN 7704 :2007
Xudt bin ldn 1
IA
i\
c6l-c,rvcO-mraffi
HUAN
rurfn
KTAT
rAo
o6nc
rfurguKrtMsofr
$0:
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-Tr
-Tcv
NOI HOI
-
YEU
CAU KY THUAT
VE
THIET
KE,
KET
CAU
.
,t
,-'

CotiC;
.fy
c0
pniru
zuEta
nniu vi
i{ijl tri I_LlYtr.N
KT'AT
I q,o
nouc
TAI L{}ITI
KIKM
S.SfYN
Trang
1
Ph?m
vi
6p
dr;ng
, 5
2 Tiri lieu
viqn
d5n
:, 5
3
ThuQt ng&,
dinh nghTa
vd kV hiQu,,
4
Kim

ndi hoi , , 11
5.4 Mdt
sAng dng
16
5.5
Hirn dng v6ithAn
hinh trq, v6i
d6y, , ,.16
5.6
dng ld
16
5.7
Cac 15 chui nguoi,
16 chui ddu
v2r 16
thd tay 16
5.8 Mr?c
nudc
, 18
5.9 Ndp
phong
nd ,
18
5.10 B0 ham
nudc
18
5.11
BQ
qu6
nhi6t,

chd
tgo
ndi hdi
,., , "31
8 C6c
y6u
cdu
vd t5p ifflt, sfi
dung, sfia
ch[ta
32
8.1
Y6u cdu
vd nhi dft ndi hoi
32
,
8.2 Y€u
tdu vd chidu
s6n9
33
8.3 Vltrf ndi
hdi
'34
8.4
Y6u cdu vd
s?rn thao t6c vir
cdu thang
' ' "'35
8.5 He
thdng cdp nhi6n

sdt chdt?o
".' '.'.44
fi.2 X6c
dinh 6p
sudt
thfi thrly lvc
sau khi
chd tao
'.' 45
10.3 Trinh
tuth&th0y luc sau chdl?o
46
rc.4 X6c
dinh kdt
qu6
thfi th0y lr,rc
sau chd
t?o
, , 46
11 Kidm dinh
sau khi l5p
det
vd
trong
qu6r
trinh sfr dung
., "47
11.1 Nhfng
quy
dinh chung

l{c ,.,.
"' '.".'51
11.6 Didu tra sucd
vlr tai ngn lao dQng
c6li6n
quan
ddn thidt bi
ndi froi
' ,' '."51
Phu
luc
A
(qui
dinh)
-
Nhiet d9 tinh
to6n c0a
thinh cdc
bo
phan
ndi
hoi
"" '52
Phg
luc
B
(tham
khAo)
-
Thdrnh

7704
:2007
do
Ban
k! thu6t
ti6u
chudn
TCVNT
Te
1_1
Ndi
hoi
vi
binh
chiu
6p ft,rc
bi6n
soan,
Tdng
cr,rc
Ti6u
chudn
Do
ludng
chdt
luong
dd
nghi,
86
Khoa

maintenance
1 Phqm
vi
5p dqng
1.1 Ti€u
chudn
niry
quy
dinh
c6c
y6u
cdu vd tfridt kd,
chd tqo,
l5p
dft s& dung vir srla ch0a
c6c
thidt
bi ndi hoi c6
Ap sudt
lirm viQc
c0a hoi
l6n hon 0,07
MPal vi c5c ndi
dun
nu6c n6ng c6 nhiQt dO crla
nuoc
ldn hcvn
115
oC.
1.2

luong hat nhAn;
c) Binh
bdc hoi
ma ngudn nhiQt
ld hoi nu6c
tu ndi khAc
dua t6i;
d)
Ndi
hdi
ddt
bing neng
lugng mit
trdi;
e)
N6i hdi
ddt bins ndng
lugng diQn;
g)
C6c
ndi hoi dat
tr6n tdu h6a,
tdu th&y vir
c6c
phuong
tien
vqn t6i kh6c.
2 Tai liQu
viQn d5n
TCVN 6008 :

6p dr;ng
c6c thu6t
ng[t, dinh nghia
vd kf hiQu
sau:
(1)
l
MPa= 1MN/m2
TCVhI
7704:2007
:
3;1
Thuft
ngfr
vd
tfrie't b!
3.1.1
Ndi
hdi
(Boiler)
Thiet bi dirng
dd sin
xudit
hdi trJ
nudc
bing
ngudn nhi6t
do
s{
ddt

phdn
chiu
Ap
lr,rc
cfra ndi
hoi:
-
Phdn
sinh
hoi;
-
Bd h6m nurdc;
-
B6
quii
nhi6t;
-
B0
t6i
qu6
nhi6t.
Nhung
ndi
hoi don
gi6n
c6
thd
chic6
pha'n
sinh

tt6ng
cfia h6n
hgp
hoi
nu6c
trong
phdn
sinh hoi
c6 thd
lA stt
chuydn
ddng
tudn
hoirn tu
nhi6n
hay
c6
trg lr,rc
hodc
ld srr
chuydn
d6ng
ctr6ng
bfic.
3.1.3
Bg hAm
nUdc
(con
goi
ld b6

hoi), hoic
chua
s6i.
BQ
hdm
nu6c
goi
ld
,,kh6ng
ngdt duoc"
khi n6
duoc
ndi
vdi
ph6'n
sinh
hoi khdng
qua
van
kh6a
vd
goi
lA
"ngdt
dugc"
khi
c6 van
kh6a
tr6n duong
noi

crla
hoi,
3.1.5
89 tei
qu6
nhi6t
(Re
-
Superheater)
iiviOt
b0
phAn
cfra n6i hoi
d'd
gia
nhi6t hoi
qud
;rhidt
d'd
qua
su
dung.
cOllc
ty
co
puirv
t"t'"r
rrN.r
vA
uunrq

6p
lr,rc:
dng
g6p,
bao
hoi, bao
nu6c,
dng
tidp
nhiQt,
dng
d6n trong
pham
vi ndi
troi'
3.1.7
Ndi
hdi
dng
nu6c
(Water
-
tube
boiler)
Ndi
hdi
trong
d6
nudc
vir

b6n
ngodri
dng
con
ngudn
ddt
n6ng
6 bdn trong
dng'
dng
Frm
nhiQm
vu
budng
ddt
nhi6n
tieu
gqi
tir 6ng
lo;
dng
d6n
kh6i
dd
ddt
n6ng
goi
ldr dng
l&a.
Budng

b6i
sr/
chcnh
lQch
trgng
ludng
c6t
nu6c
gifra
phdn
di
l6n
vir
phdn
dixudng
cfra
vdng
tudn
hodn'
3.1.10
N6i
hoi
tudn
hoin
cr6ng
brirc
hoic
c6
trg
h,rc

phdn
c0a
bom
ddy'
3.1.11
Ndi
hoitr{c
ltru
Ndi
hdi
dng
nu6c
mi
srl
chuydn
ttong
cfra
ntJ6c
vd
hoi
nu6c
ld
chuydn
dQng
mQt
chidu,
dugc
t?o
ra
b6i

c6ng
sudt
vi
tudi
ilrg
thidt
k6
3.2.1
Ap
sudt
lim
viQc
dinh
mrlc
(Norminalworking
pressure)
Ap
sudt
l6n
nhdt
mir
ndi
hdi
clugc
ph6p
lAm
vi6c
lAu
dAi:
-

qu6
nhiQt'
7
'
TCVN
7704:ZOOT
3.2.2
Ap
su61
thigt
kc'(Design
p;.essui.e)
Ap
suat
ldm
vi6c
t6n
nhdt
cho
ph6p:
a)
Tai
bao
hoi
ddi
v6i
ndi
hoi
tu6'n
hoirn

gian);
c)
Tai
ddu
ra b6
t6i
qu6
nhi6t,
bo
qu6
nhiQt
drrgc
ddt
dQc
lep,
bQ
h6m
nu6c'ngdt
dude'.
3.2.3
Ap
suit
tinh
to6n (Calculation
pressure)
Ap
sudt
thiet
kd
c6

tr6n
b6
qu6
nhi6t
hoic
tr6n
dudng
ra
c0a
bQ
t6i
qua
nhiQt
dd
bi
cho
su
giim
6rp
suat
tudng
rrng
v6i
didu
kiQn
tdm
vi6c
khdc
nghiQt
nhdt,

hoi
(xem
Phu
tuc
A
).
3.2.5
Chidu
dny
dinh
mt?c
crja
vqt
ligu
Chidu
diry
danh
dinh
c0a
v6t
ti6u.
3.2.6
Chiiu
diy
thr,rc
(Actual
thickness)
Chidu
ddy
dinh

b6
phan
chiu
6p
h.rc
cfia
ndi
hoi
trong
didu
kiQn
tdm
vi6c
c[ra
ndi
hoi.
3.2.8
COng
sudt
cria
ndi
hoi
(Boiler
rate)
sAn
luong
hoi
sinh
ra
trong

1i'Ai
l.{il,r-r
Kxtriu
sfiAT
^
a'
-""'rcvN
3.3
Thuft
ng0
vd ngudi
thie't
k6', chdt4o, mua
??,1
Ngudi
thidt
kd
(Designer)
Ngudi
c6
tu c6ch
ph6p
nh6n
(cA
nh6n hay td
chr?c) vd c6
nghi6p
vu chuydn
m6n
trong

Ngudi b6n
ndi hoi
(Boiler
saler)
Ngudi c6 trrc6ch
phiip
nhdn
(cd
nhAn hay td
chr3c) thr,rc hi6n vi6c b6rn ndi hoitr6n
thitrudng.
3.3"4
Ngudi
cung c{p
vit
ligu
(Material
supplier)
Ngudi c6 tu c6ch
ph6p
nhdn
thqrc hiQn
vi6c budn bdn c6c v?t lieu ding dd chd tao, ldp ddt,
sfia
chira ndi
hdi.
3.3.5
Ngudi
l5p dit, sr?a
chira ndi troi

vir don
vi
-
6p sudt t5c dung, MPa;
-
ung
sudt cho
phep
c(ta
kir,r io+i, lvlPa;
p
Ocp
9
TCVN
7V04:2007
o,
20,
o"20
-
gidi
han bdn keo
va
gi6i
han
ch6y
6
nhiQt
dQ
thi
nghidm

mm;
9n,
gr
-
hQ
so
ldm
ydu
do hdn,
do khoan
16;
ta, tnn,
t"6
-
budc doc,
ngang,
ch6o c6c
d6y 15 khoan;
1,,, t," -
nhiQt
d6 tinh
to6n,
nhi6t cl6
m6i chdt,
0C;
c
-
hQ
sd hi6u
chinh vd

hoi, kd
cA
que
hAn,
ddy
hdn
phSi
c6 tfnh
d6o,
d0 do
bdn theo
y6u
cdu
cfla
thidt
kd,
c6 tfnh
han
tdt,
b6o
d6m
lirm vi6c
bdn vfirrg
6
nhirng
didu
ki6n v6n
hhnh
quy
dinh.

nhu
sau:
a)
Cacbon
kh6ng
l6n
hon
0,23
%
Khi c6 su
th6a
thudn
v6i
ngudi
sfi dung
ndi froi
c6 thd
ding
th6p
c6
thdnh
phdn
cacbon
ddn
0,25
o/o
nhrnrg
phAi
ch0
y

td,
tfnh
chdt
c0a c6c
loai
th6p dirng
dd
chd
tao
c6c bQ
phQn
chiu
ap lEc
cfra
ndi hoi
duoc
tham
khir:
troig
c6c ti6u
chudn
chdt
lrrong th6p
vi6n
d6n
(xem
phr,r
luc
B).
4.1.3

dirng
dd
chd
tqo ra
b6
phrin
do.
4.1.4
Chdt lrr'sng
vir
ch0ng
loai
v3i liQu
dung
khi
che tao.
sfta
chfra
phii
theo
d6ng
y6u
cdu
crla
thi6t ke,
Khi ci
nghi
vdn
vd chdt
lugng

xudt
vat liQu
phSi
dugc
ghi
16
vao
rong
ly
lich
ndi
ici,
'l
t'r
VA
G
^.
^?
AN
I{IEM
DII,{H
KTAT
LAO
DON
KiEt\,{
s,eAr
C TY
C()
PI{
hl{

450
MPa, nhiQt
dQ tinh todn cfra thdnh
kh6ng dugc ldy
thdp hon
250
0C.
4.2.2
Th6p d0c chi
duoc sfi dung lAm
c6c van vi
phr;
tirng.
4.2.3
Kh6ng
dCrng
gang
dd chd tao
cdc bQ
phqn
chiu ap
lr,rc
c0a ndi noi,
trrr
bQ hdm
nudc
bing
gang
n6u trong 5.10,1
4.2.4 Cho

kh6ng chrla
sdt dd chd
tgo c6c
bQ
phdn
chiu
6p
luc,
trr:r cdc van
vd
phr,r
tirng drrdng dng c6 5p
sudt m6i chdt
du6i 1,6 MPa
vd nhiQt
d6 m6i
ch6't
kh6ng
qu6
250
0C.
5 YGu
c6'u vi fdt ci'u
ndi hoi
5.1
Ydu cdu chung
5.1.1
Kdt
cdu
ndi noi

vAo trong bao
hoi hay
thdn ndi froi
phii
tr6nh
lirm ch6nh
lech nhiet
d9 dQt
'ngot.
5.1.3 C6c chi
tidt
bdn trong
c6c bQ
phQn
ndi hoi
kh6ng c6 didu kiQn
kidm tra,
xem x6t,
s&a ch[a, ldrm
sqch tai cn6 tni cdn chd tao
theo kidu thSo ra duoc.
5.1.4 Tdt c6 c5c thidt bi di6n v?r
hQ thdng ndi ddt trong
pham
vi ndi hoi
phii
thr,rc hi6n theo
dring
ydu
cdu

bao hoi, bao nu6c, ong
g6p,
ndi hoi
5.2.1
ThAn
hinh
tru c0a bao
hoi,
bao nu6c, dng
g6p,
ndi noi c6 thd
dugc
gh6p
n8i nfridu tdm
kim
loai
kh6c
nhau nhr-nrg
cdn
trAnh tgo n6n c6c mdi
ghep
hlnh
ch0thqp.
1t
TCVN
7704:2AAT
Khi
ndi bdi
nhidu
tdm

2
m6
hrin
dqc.
5.2.2
Tiy theo
srlc
chiu
bdn
c0a
thdn
hinh trq, cho
ph6p
chd tao th6n
hinh
tru
c6 hai chi6u
dAy
kh6c
nhau. T?i
phdn
ndi tidp
giira
hai
chidu
diry
kh5c
nhau,
phdn
diry hon

R,
-
b6n
kinh trong
then
dU6i;
R, - biin
kinh
trong
thAn tr6n;
D,o
-
dudng
kinh
trung
binh;
S,
-
chidu
ddy
thAn du6i;
S,
-
chidu
dAy
th6n tr6n
Hinh
1
5.2.3
Chidu

22 mm.
Ndu
phAi
ddt
n6ng
thAn
hinh tru
c6 chidu
ddy
cOa thdnh
l6n
hon
22 mm
thi
phdn
bi ddt
n6ng cdn
duoc
c6ch nhi6t
tdt dd
b6o
dim
nhiQt dQ
kim loai
tqi
vr)ng
ddt
n6ng
kh6ng
vrtot

5.2.6
Cho
ph6p
khoan,
kho6t
cdrc
16 trdn thdn
hinh tru v6i duong
kfnh
c0a
16
khac
nhau.
Kho6ng c6ch
c0a
c6c
16
phAidap
Ltng
ydu
cdu
tinh
d6
bdn
thdn
hinh
tru
(xem
6.3).
C6c 16

otruu
vA
HuAr-r
LUyEN
*tot
ioJro*o-
TAI
t{}iu
Kg}1e4
sO.,ievr.r
b)
Han
thdm vong ting crnrg hoic
ong
ndi;
c)
Hirn thdrn tdm b0
chidu
ddy cho
phdn
thAnh.
Tham
khAo
c6c
dang t6ng cr,rng v0ng cho thAn hinh tru
tqi c6c 16 kho6t
6 Hinh 8
TCVN 6413 :
1998.
5.2.7

vd thAn
hinh
tru cho dng ld vd
trong TCVN 6413 : 1998.
5.3 D6y
5.3.1 Cdc
loai
dAy
phing,
d6y
enlip, d6y cdu duoc sfi dr,rng
ldm ddy cho
thdn hinh
trr,r. ViQc chgn loai d6y
ndo tiry thu6c
viro dudng
kinh
c&a thAn hinh tru vd 6p sudt tec d6ng l6n
thAn vi d6y.
5.3.2 Day
phEng
5.3.2.1
Chi dirng day
phing
cho thdn hinh
tru c6 dudng
kinh b6 nhu
dng
g6p (c6
drrdng

thin hinh trqr
5.3.2.3
C6
thd khoet 16 tr6n d5y
phSng
vd chi dugc
ph6p
khoet m6t t6. Oudng
kinh
ldn nhdt
c0a 16 <
O,o
duong
kinh trong c&a thAn hlnh tru.
5.3.2.4 Chidu
ciiry
y6u
cdu cria d6y
phSng
dugc x6c dinh
tuviec tfnh dg odn d6y
phlng (xem
6.i).
5.3.2.5 Khdng sfi dqrng day
phSng
dd ndi
v6i thAn
hinh
tru c6 clrrdng k(nh trong l6n hon
325 mm,

etfp vd
phdn
hinh
trqr
(Frinh
3)
5.3,3.2
Trong
moi trudng
hgp,
tg t6
chidu
cao tr6n
dudng
kinh
ddy
(kich
thu6c
pham
vi: 0,2,
+
<
0,3,
Chi6u
cao
cia
phAn
hinh tru
h,
> 40

ld
6 hinh
tron
hay hinh
elip.
C6c 16
c6 thd
tdng cr?ng
nho han
th6m
vdnh
ting
c0ng,
hAn
th6m
dng
ndi
ho{c
r6n
gdp
m6p
16 hoac
tdng
chidu
driy c0a
d6y 6
phdn
t5 kho6t.
(Hinh
4)

rdn
gdp
m6p; b, L6
khoet dudc han
th6m virnh ting
crrng;
c. L6
kho6t
drloc hirn th6m dng ndi
(c,.
Kh6ng c6 midng
d6m;
cr. C6 miSng d6m m6i
phfa;
c C6
miSng
o'6m
2
phia)
Hinh 4
-
C6c dgng ting
cfng
cho td
fnoOt
tr€n
d6y
elip
5.3.3.4 Khi
tang

5.3.4 D6y
cdu
Circ
y6u
cdu
vd
khoet
16 tr6n
d6y
cdu,
vd
kich thu6c
phdn
hinh trr; chuydn tidp tudng
t{ nhu
ddi vdi d6y
elip.
t'
15
TCVN.7704:2007
5'3'5
c5c
loqi
day
dang
kh6c
nhu.day
hQp,
day
cong

Ta't cA cilc loai
d6y
(elip,
cdu,
cong,
phSng
c0ng
nhu
met
sring dng) phii
dugc
chd
tao
bing
mQt
tdm
lidn.
Cho
phep
tdi
da c6
hai
t6'm
kim loai
ghep
l4i
nhrrng
mdi
gh6p phAi
c6ch

elip,
cdu.
5=4.2
chidu ddy
c&a
kim
iogi
lirm
mdt
sirng
dng
khi nric
dng
ph6i
> 14
mm.
5.4.3
C5c
y6u
cdu
vd ndi
dng
v6i
mit
sdng,
vd
thanh
giing
vd
c6c

v6i
d6y
5.5.1
Ddi
v6i thAn
hinh
tru cOa
c6c
ndi
hoi
6p sudt
thdp
c6 chidu
diry
<
18
mm
thi
c6
thd
han
dng
trr,rc
tidp
vdithdn.
Odi v6i
thAn
hinh
tru
c6 chidu

duoc
nhiQt
luy6n
cirng
v6i
thAn
(ho?c
d5y),
sau
d6
mdi
hdn
ong vdo
dng
cut. Vi6c
hirn c5c
ong
v6i
thdn
hinh
tru
hodc
d6y
chi
duoc
hirn
noi
qua
doan
dng

c6
chidu
ddy
th6n,
hodc
chi
hdn
vdo
mOt
phdn
chidu
diry thdn
hay
ddry.
5.6
Ong
lo
Theo
cdc
quy
dinh
trong
TCVN
G413
: 1998.
5.7
C6c
16
chui
nguoi,

ch0ng
loai
ph6i
c6 c6c
16 thtch
hgp
dd
chui ngudi,
chui
ddu hodc
thd
tay. sd luong
cdc
loai
16
phAi
d0
dd
cho
ph6p
danh
gia
dr,roc
chdt luong
gia
c6ng khi
ch6
tao, ldm
v€
sinh va

TaI
LItr
U
}clgn{
SO{p*
,
04:2Q07
ThAn
ndi
hoi c6
drrdng
kinh
bing
hodc
l6n hon
1.
ThAn
ndi
hoi
c6
cLrdng kfnh tu
800
mm
ddn dutdi 1.400 mm
phSi
c6 it nhdt
mOt
16 chui
Cdu.
NgoAi ra

nhidu nhdt
c6
thd bd m{t
b6n trong
c0a c6c
bQ
phAn.
5.7 .4 CAc 16 chui nguoi,
chui
d6'u, thd
tay c6 ihd c6 dang hinh
elip
hay trdn,
v6i
kich thu6c
nh6
nhdt nhu
sau:
a) L6 tho tay
dd
ldm vd sinh hinh elip kich thudc
lA 80 mm x
100 mrn, 16
hinh trdn
dudng
kinh trong
100 mm.
L6 thd tay dd
gi6m
sdrt hinh elip kich thudc 100

qu6
100
mm hoic 120 mm ndu
n6 lir hinh
c6n;
c)
C5c 16 chui
ngddi: hinh
elip kich
thrJ6c 300 mm x 400 mm,
hinh trdn
dtrdng kfnh trong
400
mm.
5.7.5 CAcl6 chui ngudi, 16 chui ddu, 15 tho tay
phAi
c6 cdu
tqo sao cho
dE dlng th6o
l5p vd
thay the n5p
oay lo.
Bd mqt tidp x.uc c0a nip dAy
v6i
16
phAi
duoc
gia
c6ng kin khit, chidu
r6ng

6ng l&a
nirn
ngang:
phAi
cao
hon
thirnh
dng cao nhdt 100
mm.
5.8.1.3 Ddiv6i c5c ndi hoi dng lo, dng lfra ctrrng:
ph6icao
han2l3 chidu cao dng lfia tinh tudu6i
l6n.
5.8.1.4 Ddi
vdi
ndi hoi kidu dng nrJ6c nim
nghi6ng hay dlmg tudn hoirn t';nhl6n:
milc
nu6cthdp
nhdt
do
nguoi thiet
ke
quy
dinh
dr,ra
theo tinh to6n cfAm bAo tudn hodn
dn
dinh c0a ddng
m6i chdt trong hQ

cho c6c
thirnh
cfra ndi
hoi
kh6ng
bi
ddt
n6ng
qu6
nhiQt
dQ
cho
ph6p
cfra
vdt
liQu chd
tao
c5c
thirnh
d6.
5.8.2 Mr?c nrrdc
cao
nhdt
cho
ph6p
trong
cdc
ndi noi do
nhd
thidt

binh
do
nhd
thidt
kd chon
dd
lirm co s6
tinh
to6n
thfiy d6ng,
tinh to6n nhi6t
cfra
ndi
hoi. lvli?e
nu6e
ndy nam &
glrta
hai mfe
nri6e thdp
nhdt
vd cao
nhdt
cho
ph6p
vd
id mric ldm vi6c
thddng
xuy6n c0a
ndi
hoi.

phong
nd 6 c6c
vi tri
sau:
a) Tr€n
budng
ddt, tai
cfdu
cudi drrdng
kh6i
c0a
ndi hoi;
b) TrOn
duong kh6i
c0a
bQ
hdm nu6c,
b6 khrltro,
tru6c vir
sau
quat
kh6i.
5.9'2
Qttc
nip
phdng
nd
ph6i
d{t
&

kh6ithAi
ph6itrang
bithidt
bi ngdt
nhanh
drrdng
kh6ivdo
ndi hoi,
5.10
86 hAm
nu6c
5.10.1
89
him
nu6c
blng
gang
5.10.1'1
B0 ham
nu6c
bing
gang
dlroc
dirng dd
gia
nhi6t
nu6c
cdp
cho
ndi hoi,

c6
nhiQt
dQ
thdp hon
nhiet d0
s6i
trong
adi
noi ft nhdt
40
0C.
5.10.1.3
Tai ddu
viro vir
ddu ra c&a
bd
hdm nu6c
bing
gang
phiid6t
c6c
phrrong
ti6n do
kidm
sau:
-
Van an
toirn:
-
Ap

ham nu6c blng thep
gdnn
c4c dng th6p kh6ng hirn. Kh6ng
cho
ph6p
dirng dng
th6p hdn mi,
hin
xodn dd chd
tqo dng c0a b9
hdm nu6c.
5.10.2.2 Nu6c ra kh6i
bO
hdm
nu6c blng th6p
c6
thd 6 tr4ng th6i s6i ho{c
khdng
s6i.
5.10.2.3
Cdn c6 c6c
biqn
ph6p
chdng miri
mdn bdi than vi tro bay
trong dudng
kh6i,
chdng
in mon bdi
kh6i.

mm dd de
thao t6c khi thi
c6ng hodc trong
khi sfra chfra.
5.11 Be
qu6
nhiQt, tiii
qu6
nhiQt
5.11.1 Khi
ndi hoi c6 trang bi
bQ
qu6
nhiQt, bQ
t6i
qu6
nhiQt thi
phAi
trang
bithidt bi do kidm nhiQt dQ hoi
qu6
nhi6t. Khi nhiQt
d0 hdi
qu6
nhigt l6n
hon 350
0C
thi
ph6i
trang bi hQ thdng

chinh nhiet
dO hoi
qu6
nhiet
ph6i
b6o ttAm
phdi
hgp
nhip nhdng
viec didu chinh
khi sfi dUng
Ctdng
thdi cac bien
phdp
nay.
6.11.3
NgLrdi-lhidt
kd ndi
hoi
ph6i
quy
dinh
gi6i
han nhiQt dQ lirm
vi6c
dinh mrSc cOa hoi
qu6
nhiQt. C5c
dao
dgng

sinh hoi duoc
chd
tao
thirnh ddn
c6 hirn mirng ndi dqc
theo
dng
phii
bio dAm
gi5n
nd ddu tq
do
cho tdt c6 c6c
dng trong
dirn.
Mdt trong dng sinh hoi
c6 thd la trlon
hay c6
rdnh
xodn.
Chidu
ddy tdi thidu cfra dng
sinh hoi
phii
theo
Airnn tri cA nhi trnnn F[4nn 4
uur rv rr
I
ev
v,,,

-
Phuong ti6n
do 6p suat
(ep
kd);
-
Phuong
ti6n ilo mrlrc nu6c
(ong
th&y,
ddng hd
do mfc nrl6c );
-
Phuong
tiQn khdng
chd 5p sudt
(van
an
toirn);
19
TCVN
7704:2A07
-
Phudng
tiQn do
nhiQt dQ
(nhiQt
kd)
dirng
cho ndi

ndi noi
trtrc
k"ru
thi
6p kd
phSi
ddt
tnr6c
van
kh6a
dudng
hdi ddn
noi
ti6u
thu.
C6c ndi
hoi c6
bQ
qua
nhi6t
ngoiri 6p kd
6
bao
hoi cdn
ph6i
d{t
th6m
ft nhdt
m6t
6p

nrl6c vdo
vd ra
kh6i bo
hdm
nu6c loai
ngSt
duoc.
TrGn
dudng
nu6c
cdp
vao
ndi hoi
ding
bom li tdm
hay
pitton
c0ng
phdi
det
ap
kd tqi
ddu
ddy
crla
bom.
5.13.2'3
Ap
kddft
tr6n

x6c
2,5
vitdtrdng
kinh
mit
6p kd drrdi
150
mm khi
det ap
kd
cho ndi hdi
c6 dp
sudt
khdng
quA
2,2
Mpa
vd
chi6u
cao
tinh
trr sin
phuc
vu
ddn vitr'(d'5t
Apkd
khong
qu6
2 m,
crJng

ddy
nu6c.
Ap
kd
duoc ndi
v6i
dng ndi
qua
van
ba
ngA.
Ddi
v6i ndi
hoi
c6
dp
sudt
cao
c6 thd
thay
van
ba
ng6 bing
mQt
dng ndi
vA van
khtic dirng
dd l5p
6p
kd kidm

hoi
phii
dugc
kidm
dinh
vir
ni6m
chi
m6i nem
mOt ldn
vA
sau
m6i tdn
s&a
ch0a
6p
k6
tai noi
dugc
ph6p
kidm
d!nh.
5.13.2.6
Thang
do c0a
6p kd
ph6i
cluoc
chon
sao

c0a
ndi
hoi.
5.13.2'7
Ap
ke
dirng
dd theo
d6i
trr,tc
tiSp
6p sudit
ph6i
duoc
ddt nhu
thd
nAo
dd
d6
nhin
thay tai
sdn
phuc
vu: mit
ap
l(6
dat thing
dung
khi
ngang tdm

phuc
vr-i;
b)
Khong
nh6
hon
200 mm khi
det
cao 3 m den
4
m
so v6i
sdn
phuc
vu;
c)
Khdng
nh6 hon
250 mm
khi
dAt
cao tron 4
m
ddn 5 m so
vdi
sirn
phuc
vu.
KhOng
n6n dft ap

crla
don vi
kidm
tlinh;
ho6c
n!6m
chi, ni6m
phong
kh6ng
hgp
le;
b)
Qua
han
kidm
dinh;
c)
Ap
kd lam
viQc
khdng
chinh xiic;
d)
Kinh
vd
hodc c6c
hU h6ng
kh6c c6 Anh
hudng ddn
dQ lAm vi6c

thd ta:
a)
6ng th0y dd
do
tnrc
tidp mrSc
nu6c theo
nguy6n
l1i binh
thong
nhau
c6 vdt
li6u
bing
thfiy
tinh trong
sudt hay
vQl liQu trong
sudt kh6c chiu
duoc
nhiQt d6 vir
dp sudt
c0a
ndi noi;
b) C6c ddng
hd do mt?c nlf6c
le thidt bi
do
mr?c nu6c
gi6n

truc ti6p viro
than
bao hoi hay thdn
ndi hoi; c6i tht?
hai c6 thd
h thi6t bi do
mrlc nu6c
gi6n
tidp.
5.13.3.2 Nh*ng
ndi hoi
c6 nhi6u cdp
bdc hoi vdr
chia bao
hoi thirnh
c6c
ngdn
cho m6i
cdp bdc hoi thitai
'
m6i ngdn
phii
dit
m6t dng th0y.
5.13.3.3 Nhilng
ndi hoi c6
nhi6u bao hoi
dflt trdn cao thi
6 bao hoi
cdn theo

dng
thfry
cho m6i bao hoi.
5.13.3.5
C6c
ndi
hdi
c6 cdng sudt trln
2 tdn/gid
phAi
c6 thidt bi tr,r
dQng b6o
hiQu mfc
nu6c vd bAo v6
can nu6c.
Duoc
thay thidt bi tU
dQng b6o hi6u
mfc ntr6c vi b6o
vQ cgn nu6c bSng
mdl dinh
chi khi diQn tich tidp nhi6.t
c0andihoi(phdnsinhhoi)
ddn17 m2vdhai dinhchikhidiQntichtidpnhi6ttrdn
17m2.
iuong clinh
chi
phii
o%m bio chAy
dudc khi ndi hoi

th0y.
21
TCVN
77A4:2OET
:
5.13.3.7
Cic
dng
th0y
ph6i
c6
d0
van
d6ng
m6
vd
van
x6,
b5o d6m
viQc
th6ng
r&a vir
thay
thd
kinh thrly
tinh khi
ndi
hoi
cdn
d'ang

vi6c
theo
d6i
mr?c nrr6c.
5.13.3.8
C6c dng
vd
phu
tirng c0a dng
ndi
dng th0y
ph6i
cdng
ngSn cdng
tdt
va
phai
thidt
kd
sao
cho
kh6ng tao thanh
t0i
dgng
nu6c
gifra
ndi froi
vir
dng dbn.
Trong

trong
dng d5n
ph6i
tron nhSn
ed
tranh
hm tdc dng
din.
Kh6ng cho
ph6p
ddt bich
ndi
trung
gian,
van
kh6a
hay trich
hoi,
ntr6c
cho muc
dich
kh6c
tr6n dng d6n
ndy.
5.13.3'9
Tr6n mdt
dng
thtly
ph6i
05nh

dQc
lqp, trr]
c6c
ndi
hoi
c6 tich
sd crla
6p
sudi
tinh
bing MPa
v6i tdng
thd tach
crla n6i tinh bdng
lit
kh6ng vudt
que
1000 thi
dugc
ph6p
tdp
mgt van
an todn.
M6i b0
qua
nhiQt
phii
c6
ii nhdt
mQt

nhigt
dugc
coi lir van
an
todn thr? hai
c0a
ndi hoi.
Khi
giua
b6
qu6
nhi6t
vd ndi
hoi c6
d{t van kh6a
thi van
an todn
c0a
b6
qu6
nhi6t
kh6ng
duoc
coi
lir van
an todn thr?
hai c0a
ndi hoi.
5.13.4.2
Kh6ng dugc

hdi.
5.13.4.4
C6c van
an toAn
dat 6 bdt
kV ndi hoi
ndo
(kd
cA
van
tai bQ
qu6
nhiet)
ph6i
c6 dfi kha
ndng
tho6t
hoi nu6c
drrgc
xA ra
dd kh6ng
lAm cho
6p sudt
cfra ndi
hoi tdng
qu6
10
% Ap
sudt
lAm

dAy cho
c6c
ndi
hoi tiiy thudc
viro th6ng
sd cfra
hoi:
a)
Kidu don
bdy;
22
cnNC Ty
co
pnArl
ruri'r
prrug
vA
F{ijal'l
l-UYf
iq KTAT
LAO
D.fJNG
b)
Kidu
lo
so;
c)
Kidu
xung
luong

duoc
dflt trr,tc tidp v6i
ndi hoi
hay
dng
g6p
clra
bQ
qu6
nhigt
ho{c
ding
dng
cut vdi di6n tich
mflt cdt ngang
crla dng
cut it nhdt
phii
bing
tdng
diQn
tich
c0a c6c
t6
van l5p
tr6n
dng
cut.
5.13.4.8 Oudng
xi cfra van an todn

c6 kdt
cdu sao
cho
khdng
tich
tu
ch6't l5ng
ilong
hodc
nrl6c
ngung
lAm
han
chd
dong
tho5t
c0a hoi nudc.
5 4?
r.
q
An
srrdt
t4.
,{Ann
nrla \/an
an fnin drfnr: v4n r'tinh hBnn
't
4
lAn 4n o,,a+ lA- r,iAn
nan

dQng
c&a van khi ndi
hoi
clang lim
vi6c.
5.13.5
Nhiet k6'
5.13.5.1 Nhiet kd
ph6i
dugc dAt bdt buQc 6 ifdu vdro
vA ra c0a
bQ
hAm
nudc bing
gang,
6 dng
g6p
vAo
\ i.
vd ra
m6i
cd-p c0a
b0
qu6
nhi6t vd bd t6i
quA
nhiQt.
5.13.5.2 Tai nhitng vi tri khdng thd
doc
truc

nudc
vdo ndi
hoi
khi ndi hoi
ldm
vi6c
6 ep sudt
l6n nhdt cho
ph6p.
23
,',:'
TCVN
7704 1
2007
5.14.2
M5i
ndi
hoi
ph6i
dLtdc
trang
bi ft nhdt
hai
thi6t
bi
cdp
nu6c;
mot
lirm
vi6c

mQtthidt
bi cdp nu6c
phii
bing 110
% c6ng
sudt dinh mr?c
c0a
ndi noi.
5.14.3 Khi
gian
ddt bam
nim c6ch
xa
bAng
didu khidn
nrir ndi
hd'
phai
hoat
d6ng
li6n
trlc thi
giira
bom
ldm viec
v6i bom dr.t
phdng
cdn
phii
trang

Thidt
ke ndi froi
phii
b6o
dAm
tudn th0
nghiOm
ngit c6c
y6u
cdu
vd
kdt cdu
ndi
hoi vir
c5c
bg
phAn
ctla
n6, chon
dring
ddn vdt
li6u
chd tao,
tinh
d6m
b5o
dg b6n cho
ch0ng
c6ng
nhrltho6

b9
phan
chiu 6p
lgc c0a
ndi hoi
6.2.1
Xiic dinh
nhigt
d9 tinh
to6n -
Theo
chi
d5n trong
phu
tuc
A
6.2.2
X6c dinh
(lrg
suit
cho
ph6p
6.2'2.1
Ung sudt
cho
ph6p
ddi
v6i vAt
li6u m6i
chd

Ddi vdi
vdt liQu
cfra
cdc ndi
hoi c0,
dQ bdn crla
th6p
dd
gi6m
di
do kim
loai
cfi
bi ddt
n6ng, bi
dn
mdn,
mdi mdn thi cdn
ldy
m5u dd
kidm
tra co t[nh,
ts d6 x6c
dinh
rlrng
sudt
cho
ph6p.
Ch6
cdt ldy

'
n
(.
Trong
d6 nr, n"
-
hQ
sd
du trfr
bdn
khi t(nh rtng
sudt
cho
ph6p
theo
d6
bdn kr6o
(or)
hodc
theo
gi6i
han
chiy
(o")
6
eidu
ki6n
nhi6t
dd
trong

cCxc
ry
cc
pnArrr
xrdrur
orrvH
vi
i{uir.r
luyrN
r(TAT
r-no
pONc'^
\AAr;
TAX
LrEi.r
KIEM
S4&i|
6.2.2.3
Khi khdng
c6 c6c
nhin hi6u
c0a
th6p
hoituong
ung 6
phu
h,rc thi
ung
sudit
cho

nghi6m
x6c dinh
gi6i
han bdn
o62o
vir
gi6i
han ch6y
o"20
dtrgc
th{c
hien
cho
tdt
cA c6c
loai
th6p
khi d{c tinh
crla
th6p
c6 nhitng
sai
l6ch so
v6i ddc
tinh cira
c6c
nhin
hi6u
th6p
dd

i.:hi nhiei
dQ iinh
iodrr
nim
irong
pham
vi haiiri
sd nhi6i
dd cho
trong
c6c bAng
dic tfnh
thep.
Tri sd ldm
tron
ld'y vd
phia
gi6m.
6.3
Tinh dg
bdn thin
hinh
trg,
bao
hoi, bao
nudc,
dng
g6p,
than
n6i

D,+s
Trong
moi trr.rdng
hop,
chidu
ddy th6n
hinh tru
cOa
bao
hoi, bao
nu6c,
th6n
ndi
hoi
c6 dudng
kinh
trong
tr6n
600 mm
khdng
nh6
hon 6 mm,
khi
dtrdng kinh
trong
dudi
600
mm
-
khdng

phia,
Khi hdn
bing
tay mot
phia
c6
midng l6t,
ldy
<p
=
g,g'
s>
PD'
*c
2po"o
-
p
Theo
phuong
doc
truc:
ea
=
hodc
S>
PD'
+C
'
2po,o
+ p

.
ldyg=0,8,
t1.,, art
r€ly
v
-
I,u,
tu-d
t,1
=t'-d
ln
Theo
phuong
ngang
truc:
e,
25
TGVN7704:2AAV'''
,,'
:
,'i,
"',
"
6.3.3,2 Khi d5y t5 eqt
so
!e,
cdn t:tlT-
he
sd
lirm

ld br.r6c t, con
dudng kinh i5 ld
tdng
c6c duong
kinh 16 trong nh6m.
b) Giira 2 dhy 16
c6
cluong
kinh kh6c nhau,
do d'6 c6c td
tfrOng thd dAt
song
song md
lir so le
n6n cdn
tinh hQ sd lirm
ydu
theo
phudng
ch6o
theo cA zwcn
thudc duong ch6o
ndu c5c
kich thrr6c
ndy lA
kh6c
nhau;
c) TrOn day chi ld nh[rng
quy
dinh tdng

16 dugc chon ld tri
so nh6 nhdit
trong c6c
tri sd ducc
xac dinh
tr-t
q,
2q1,
k"9"'
v6i
k"
-
hQ sd hiQu chinh cho
phrldng
ch6o, drroc x6c
clinh nhu sau:
k,=
,
=
L
(c6c
kich thu6c
b, a duoc chi
tr6n Hinh
6.3.3.3
(b)
a
6.3.4
C6c
h6 sd lAm

6.3.5
H9
sd
hi6u chinh
G
C
=
'1
mm khithep
tdm dirng dd chd tao
c6 chidu
ddy
<
20
mm
C
=
0 khithep tdm
chd
tao c6
chi6u
diry > 20 mm.
6.3.6 Chidu
ddy cfra
th6n
hinh tru
chiu 6p
sudt
ngodi, trrrdng ld cfra lo hoi dng
ld, ldy ting