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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%。
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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?
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附上标准章节:
6 ~# }2 t( @3 e# H# H& I! k4.3.12 Flammable liquids, W: \# t; s4 E7 d" D
. g P* M H. ^; S8 VIf a flammable liquid is used in equipment, the liquid shall be kept in a closed reservoir,* U. p5 r1 u& u- n% F/ k
except for the amount needed for the functioning of the equipment. The maximum quantity of
, y) F! {% {4 kflammable liquid stored in an equipment shall in general be not more than 5 l. If, however, the; f: P0 U+ R/ m8 E0 _( R0 e
usage of liquid is such that more than 5 l is consumed in 8 h, it is permitted to increase the
$ P0 s/ S+ d- P* Y( {/ b3 Wquantity stored to that required for an 8 h operation.8 ^ P; E+ |# g" U g" d- }
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Oil or equivalent liquids used for lubrication or in a hydraulic system shall have a flash point
' j1 W- |& |' ?5 p2 \9 y. V. Rof 149 °C or higher, and the reservoir shall be of sealed construction. The system shall have* S; M% t1 I8 ^' L7 s F8 n
provision for expansion of the liquid and shall incorporate means for pressure relief. This# w$ U! }' f0 l" i" _7 C# N
requirement is not applicable to lubricating oils that are applied to points of friction in( L0 Y( S4 Q3 s. ~! J1 s
quantities that would contribute negligible fuel to a fire.' f( ]9 Q: F7 p Q4 t" M+ r
+ W! O& Y5 C1 q: c& fExcept under conditions given below, replenishable liquids such as printing inks shall have a
# u; |8 l) q3 a6 aflash point of 60 °C or higher, and shall not be under sufficient pressure to cause atomization.
- Y9 X* A! }$ wReplenishable flammable liquids that have a flash point of less than 60 °C or that are under- `1 k2 Y( b# x: s
sufficient pressure to cause atomization are permitted provided inspection shows that there is
, S6 t/ K `- d% Wno likelihood of liquid sprays or build-up of flammable vapour-air mixtures that could cause7 C+ h" Y @9 L
explosion or create a fire hazard. Under normal operating conditions, equipment using a2 n, u% l' | s4 N
flammable liquid shall not generate a mixture with a concentration exceeding one quarter of
) W8 K" u4 n9 K7 y: dthe EXPLOSION LIMIT if the mixture is in proximity to an ignition source, or exceeding half the9 e6 j+ }# D& u J! `
EXPLOSION LIMIT if the mixture is not in proximity to an ignition source. The investigation shall
/ @: b+ \; H2 U! L* R; H4 Zalso take into account the integrity of the liquid handling system. The liquid handling system
0 D: ]8 O2 [6 u# Jshall be suitably housed or constructed so that risk of fire or explosion is reduced, even under
+ B. e) H( Q& z1 d( othe test conditions specified in 4.2.5.
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Compliance is checked by inspection and, where necessary, by the following test.
9 L. C; [, \" D% l' z( q9 CThe equipment is operated in accordance with 4.5.2 until its temperature stabilizes. In this
# `- c/ S% P/ z1 b9 T) @4 c" D4 C- ^+ Vcondition, the equipment is operated in a normal manner, as directed in the operating
$ }% b, d" ]0 A& Z8 Oinstructions, and samples of the atmosphere in the vicinity of the electrical components and
0 N( Y8 F- z8 X1 {; v6 z+ x5 [/ F' B% \around the equipment are taken to determine the concentration of flammable vapours present.
& D% `2 e, k; o4 sSamples of the atmosphere are taken at 4 min intervals; four samples to be taken during
) P$ x( _, e" T: n+ `7 _normal operation, then seven samples after the equipment has stopped.# D+ e! c# Y7 ~% T& h) n
1 i' N4 n# c) G6 C- S* AIf, after the equipment has stopped, the concentration of flammable vapours appears to be
( n0 ?+ x+ ^$ y' d* \, qincreasing, samples shall continue to be taken at 4 min intervals until the concentration is
* j. S# i! K1 e* Wshown to be decreasing.; ~( A( s8 {6 k" h" o
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If an abnormal operation of the equipment is possible with any of its fans not running, this
7 x2 y6 o) E W- A; Z0 |% Z6 xcondition is simulated during this compliance test. |
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