- Thanh ren Dai6c '
c'a'3 ch{P nhnn
. , {F
Cdc chai drrc chdp nhdn dd dat qua phep thri ndu Ap sudt kndng thay ddi trong thdi gian duy tri ep su6t thu vi khOng c6 ddu hir6u ro ri nudc tu chai.
Khi m6t sci chai duqc tht cirng mQt l0c vA neu 6p sudt giAm di trong thdi gian duy tri Ap sudt thu rhi chai ro ri dwoc loqi b6 vA sd chai c6n lai drrc thrl lai hoic ndu kh6ng xAc dinh dlroc chai ro ri thi phAi thr? lai
trmg chai m6t.
C.5 Thf d0 ddn nd thd tfch bing thu,i tgc
C.5.1 Y€u cdu chung
Thrid0 ddn ndthdtich bing thuf luc.la m6t ph6p thrlso s6nh dQ din nd vTnh c&u c0a m6t chai v6i d6 cdn no tdng c6ng tai ap su{t tht. oQ dln nd tnd tich bidu thi sutoan ven c0a chai cung v6i rinh deo
vat li€u ldm ra no.
qy ou€rr Lrru, L/v rrclil rru Ur." Lruil urt u ut! $u ruan vsn oua Gnat cung vol Ilnn oeo cua
,F*
Co hai phuong phap thrl:
a) phutrng phdp boc nursc;
b) phurng ph6p kh0ng boc nudc.
Phrrong ph6p bgc nuoc do thd tich crla nr"rdc bi ddy ra tur mdt cAi boc nuoc c6 chria chai thri duoc diCIn
ddy hoAn toAn. Phuong ph6p kh6ng boc nudc dOi h6i do thd tich nrrdc drioc bsm vao trong chai dd dar
duoc 6p sudt thri vA didu chinh do tinh 6p crla nuoc.
C.5.2 Quy trinh tht?
C.5.2.1 Phuong phdp bgc nu6c
Chai dusc di€ln ddy hodn toAn bing nuoc duoc dit vio trong m6t hOp (boc) c0ng duoc nap ddy nudc.
O0 ddn nd ttrd tich vinh crru vi tdng c6ng
din nd cOa chai dr.r6i 6p sudt thrl va thd
giAm.
6295 : 1997
dn tu ngp do vi6c tich nudc khOng quay tai hQp sau khi todn b0 iip su6t duoc
C"5.2"2 phuong ph6p kh6ng bgc nu6c
Phrong phap niy do thd tich nu'oc dr-oc bom thOm vao chai di ddy nu6c od oqt 6,p sudt thri vir do thd
tich c0a nudc bi ddy ra kh6i chai dd giam ap suat cho ddn khi bing 6p suat khi quydn.
Do ldn ddu khi tang ep luc nufc trong chai dd xac dinh d0 ddn n6 tdng cga chai d 6p sudt tht, saud6 do h-rong nr'J6c bi ddy ra kh6i chai, ldy d0 dan nd tdng tnr di ruung nu6c do dd x6c dinh d6 din no. d6 do h-rong nr'J6c bi ddy ra kh6i chai, ldy d0 dan nd tdng tnr di ruung nu6c do dd x6c dinh d6 din no.
vlnh cfiu"
C.5.3 Chdp nhgn
;Trong ca hai trudng hop c6c chai duoc chdp nhtn de dat qua ph6p thr] n6u:
a) khOng xdy ra 16 ri nu6c tu cfrai;
b) d0 ddn nd tnd tich vlnh crlu kh6ng vuqr qud 1o% dO din nd rhd rich tdng cong.
C.6 Thrl dd kin
C.6.1 Ydu cdu chung
cic chai dd qua thrl6p suat tnuf lr-rc phAi drryc thf, d0 kin cd xtring dinh khong c6 ro ri .
DQ kin duoc kidm tra bing c6ch nh0ng chim chai vao nur6c hoic bing cach b6i dung dich xi phong vio d6y hay d0ng bdt k| phep tht} nio kh6c c6 d9 nhiy trlung duong.