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60950-1中的4.3.12条要求对可燃气化物浓度进行取样检测,要求在设备周边环境中,浓度不大于其爆炸限值的50%,在点燃源附件不大于爆炸限值的25%。# N3 y- H+ ^. f
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现有一喷码机,使用丁酮墨水,需要按此条检测,疑问是,标准中只说在正常使用下,那么检测应该在多大房间内进行?是通风还是密闭?因为喷码机销售后在实际使用中按照使用者的环境运行,多大房间,通风情况均不确定,有其他相关标准有规定吗?2 Z4 l' N0 l3 P, w( a
6 ]$ R0 C3 T. `. j$ y9 f" s附上标准章节:
; U4 j! t' L% B. c" a2 _/ \( L4.3.12 Flammable liquids: p2 S& N t8 E3 u( P9 G9 r9 b
9 T% S- t) a9 F2 i, M6 BIf a flammable liquid is used in equipment, the liquid shall be kept in a closed reservoir,/ e" R4 V9 S# T% X$ \3 b
except for the amount needed for the functioning of the equipment. The maximum quantity of: @7 o/ s+ C4 F( @7 Z9 c
flammable liquid stored in an equipment shall in general be not more than 5 l. If, however, the
7 p5 A1 ]# P p3 v) [+ Dusage of liquid is such that more than 5 l is consumed in 8 h, it is permitted to increase the% {! u* i: S' N$ Q9 w
quantity stored to that required for an 8 h operation.; I! ?6 i* q) Y. v8 z- [$ r
9 y7 y- \" ?/ S8 ^Oil or equivalent liquids used for lubrication or in a hydraulic system shall have a flash point
' L' U: ]4 q4 I0 q* I2 Z' ^6 x: {% Pof 149 °C or higher, and the reservoir shall be of sealed construction. The system shall have
+ A \" y/ |) r! y: U% J' X8 oprovision for expansion of the liquid and shall incorporate means for pressure relief. This. C2 X6 \3 [+ D w
requirement is not applicable to lubricating oils that are applied to points of friction in
6 h; Z! Y5 L3 B) `quantities that would contribute negligible fuel to a fire.4 c& i3 [5 ]+ F3 N" {" ^; {+ i0 P
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Except under conditions given below, replenishable liquids such as printing inks shall have a
" z. a" D1 O/ Q% }* m" _: P4 Gflash point of 60 °C or higher, and shall not be under sufficient pressure to cause atomization.
1 z2 o& A+ P. e2 Q: x7 r* ~Replenishable flammable liquids that have a flash point of less than 60 °C or that are under0 @5 t% a: Q: I! ^ ~
sufficient pressure to cause atomization are permitted provided inspection shows that there is
- @- f7 m- D- v8 i4 c- J9 j$ Yno likelihood of liquid sprays or build-up of flammable vapour-air mixtures that could cause+ E; s0 R1 X2 R
explosion or create a fire hazard. Under normal operating conditions, equipment using a
2 \) h: N7 {7 y4 W, d* vflammable liquid shall not generate a mixture with a concentration exceeding one quarter of" v7 X0 z! Z* L: i3 Z
the EXPLOSION LIMIT if the mixture is in proximity to an ignition source, or exceeding half the
7 `! ^! f' |. [& g, mEXPLOSION LIMIT if the mixture is not in proximity to an ignition source. The investigation shall; A% v, @) U# U ~
also take into account the integrity of the liquid handling system. The liquid handling system; J2 K6 ?; i( f. l `: s
shall be suitably housed or constructed so that risk of fire or explosion is reduced, even under' Q" ]6 D4 F5 n9 e
the test conditions specified in 4.2.5.
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( l, J, C) }5 \3 YCompliance is checked by inspection and, where necessary, by the following test.4 J+ Z1 v8 O: B6 f! U
The equipment is operated in accordance with 4.5.2 until its temperature stabilizes. In this
- B4 [8 A& B/ y, L7 Y# Acondition, the equipment is operated in a normal manner, as directed in the operating- F/ I1 t* \2 G, i, g( c
instructions, and samples of the atmosphere in the vicinity of the electrical components and8 }: ]" X" X7 M
around the equipment are taken to determine the concentration of flammable vapours present.
" d o& F5 L. o9 v" {* pSamples of the atmosphere are taken at 4 min intervals; four samples to be taken during% g- P+ M# S/ ~+ h) P; t
normal operation, then seven samples after the equipment has stopped.
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If, after the equipment has stopped, the concentration of flammable vapours appears to be
6 U% l% t1 T. m3 p* l& fincreasing, samples shall continue to be taken at 4 min intervals until the concentration is+ ?. D! J" }$ \# C
shown to be decreasing.
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If an abnormal operation of the equipment is possible with any of its fans not running, this
2 O% b. G. _# v% V, y; Dcondition is simulated during this compliance test. |
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