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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?& ?( Z$ e$ e$ Y6 u$ S* V0 w) a9 E
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附上标准章节:) ^' m; ]; }% Q8 p2 v+ Q
4.3.12 Flammable liquids! B: U5 z0 T' l6 _& d& e
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If a flammable liquid is used in equipment, the liquid shall be kept in a closed reservoir,
& C) c' F) V" B: C: C& Eexcept for the amount needed for the functioning of the equipment. The maximum quantity of
% _* t+ X$ e6 Z; M# g5 fflammable liquid stored in an equipment shall in general be not more than 5 l. If, however, the
# O) M8 F: ]# j' v/ U$ }usage of liquid is such that more than 5 l is consumed in 8 h, it is permitted to increase the2 Z% ~' J, ~. V1 {, w
quantity stored to that required for an 8 h operation.
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, }+ @8 Z* g: \ ?Oil or equivalent liquids used for lubrication or in a hydraulic system shall have a flash point
B$ _2 L" u5 ]3 C; v, e7 Mof 149 °C or higher, and the reservoir shall be of sealed construction. The system shall have
# p+ F' c/ l, K& ^provision for expansion of the liquid and shall incorporate means for pressure relief. This
_; n* O3 u. u8 Q* |, q5 b* I0 yrequirement is not applicable to lubricating oils that are applied to points of friction in9 y# ?) C' L& d
quantities that would contribute negligible fuel to a fire.: J4 K$ n% Q6 V; b0 j" J+ T5 @
8 G% p) {* n, s4 N7 CExcept under conditions given below, replenishable liquids such as printing inks shall have a
9 c! P: U- J8 u! y# pflash point of 60 °C or higher, and shall not be under sufficient pressure to cause atomization.
' z2 K1 n- y3 n8 |8 X! tReplenishable flammable liquids that have a flash point of less than 60 °C or that are under
/ y* m" S. b' f: g; L5 L% g, nsufficient pressure to cause atomization are permitted provided inspection shows that there is
& f* t% q+ V- M9 x8 k4 D. bno likelihood of liquid sprays or build-up of flammable vapour-air mixtures that could cause9 a9 p+ h7 ]; U3 a0 r. _
explosion or create a fire hazard. Under normal operating conditions, equipment using a
+ B; h/ \: J( P; Eflammable liquid shall not generate a mixture with a concentration exceeding one quarter of4 z/ D% M4 Z, c" l: `$ W
the EXPLOSION LIMIT if the mixture is in proximity to an ignition source, or exceeding half the
4 Z1 ^7 k8 ]$ i; @4 f% V, n( dEXPLOSION LIMIT if the mixture is not in proximity to an ignition source. The investigation shall! z/ Y8 U6 | a8 U* Y
also take into account the integrity of the liquid handling system. The liquid handling system
# i0 [( j/ }+ S3 W* Y. Ishall be suitably housed or constructed so that risk of fire or explosion is reduced, even under
* M+ _7 }* R* \8 a ^, u5 J' Dthe test conditions specified in 4.2.5.! B( J1 X8 o2 W7 s! g) c6 D2 V3 J
$ j5 K. u" Q9 g$ {3 RCompliance is checked by inspection and, where necessary, by the following test.: A- K5 A% p* P R
The equipment is operated in accordance with 4.5.2 until its temperature stabilizes. In this4 A. ]1 s; `! c8 A0 A, v
condition, the equipment is operated in a normal manner, as directed in the operating
3 O( n" G8 N a3 I4 B2 F- |1 r5 Zinstructions, and samples of the atmosphere in the vicinity of the electrical components and% Z6 p4 d4 W0 Y. o& X
around the equipment are taken to determine the concentration of flammable vapours present.
7 x2 t0 Z. L# q! ~; bSamples of the atmosphere are taken at 4 min intervals; four samples to be taken during
1 A5 d. {# o5 Z, X1 R) Wnormal operation, then seven samples after the equipment has stopped.
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- R) s& N% ?3 L! B/ g2 W$ V9 @ cIf, after the equipment has stopped, the concentration of flammable vapours appears to be
! `; _' A% _* H% m5 z, P: ?increasing, samples shall continue to be taken at 4 min intervals until the concentration is! f7 ~1 D1 J p$ x* E5 V
shown to be decreasing.
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% i, K$ ?+ l' j* o x5 {8 qIf an abnormal operation of the equipment is possible with any of its fans not running, this
0 r# y p% ?; _' X% j+ g$ econdition is simulated during this compliance test. |
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