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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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7 T0 D8 Q& M. y# r# M& n附上标准章节:
6 W3 [" Y% t* k$ r4.3.12 Flammable liquids( G0 u5 P9 z: K3 `
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If a flammable liquid is used in equipment, the liquid shall be kept in a closed reservoir,! I2 {. x: t! t6 `( N
except for the amount needed for the functioning of the equipment. The maximum quantity of
4 V/ x) w6 m K$ s! a! Mflammable liquid stored in an equipment shall in general be not more than 5 l. If, however, the
% m: ^, A/ O: V) zusage of liquid is such that more than 5 l is consumed in 8 h, it is permitted to increase the+ A. N& H% A9 K& z
quantity stored to that required for an 8 h operation.
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Oil or equivalent liquids used for lubrication or in a hydraulic system shall have a flash point
, O' N' H, U8 Y$ rof 149 °C or higher, and the reservoir shall be of sealed construction. The system shall have& ?$ p0 g* D1 o6 a" @( A5 t# _
provision for expansion of the liquid and shall incorporate means for pressure relief. This4 m. v2 M q% H* _3 R0 z
requirement is not applicable to lubricating oils that are applied to points of friction in& I' a, [/ X! C# V; D0 t
quantities that would contribute negligible fuel to a fire.0 V( S8 M2 s4 T9 e% Z/ Q$ ?2 c
: w) V$ Q( {, M7 O/ D" @) XExcept under conditions given below, replenishable liquids such as printing inks shall have a5 O2 {7 ^" q/ A' U; E
flash point of 60 °C or higher, and shall not be under sufficient pressure to cause atomization.6 m8 ?* v$ S" b$ e
Replenishable flammable liquids that have a flash point of less than 60 °C or that are under7 l" A8 O$ z$ h7 u" n' S" F
sufficient pressure to cause atomization are permitted provided inspection shows that there is
9 u' u# R4 k% Eno likelihood of liquid sprays or build-up of flammable vapour-air mixtures that could cause2 L/ a5 D, c+ a6 G: D$ R7 ]) D: R
explosion or create a fire hazard. Under normal operating conditions, equipment using a5 m" x# J& s2 r- `7 b+ `; N% ?
flammable liquid shall not generate a mixture with a concentration exceeding one quarter of' m/ ~" `- S8 y
the EXPLOSION LIMIT if the mixture is in proximity to an ignition source, or exceeding half the( z& u3 m; M+ z( `7 p. Y1 V
EXPLOSION LIMIT if the mixture is not in proximity to an ignition source. The investigation shall0 |( ], J y0 P- ^& y- L. Y) U! n
also take into account the integrity of the liquid handling system. The liquid handling system
6 V8 i0 H0 l3 |2 ]) f, Oshall be suitably housed or constructed so that risk of fire or explosion is reduced, even under. B0 I( h0 h1 l ^8 @3 w2 m
the test conditions specified in 4.2.5.) R! c# d `+ o2 l8 Y n) b2 S5 M
. G" \, t- u. a: S0 L( fCompliance is checked by inspection and, where necessary, by the following test.+ b5 f4 b, d6 ?+ e9 P3 F
The equipment is operated in accordance with 4.5.2 until its temperature stabilizes. In this/ @$ R) x+ F. W& u% M$ E4 I
condition, the equipment is operated in a normal manner, as directed in the operating* ]4 w# i4 X' w) b5 w, }3 Z) _
instructions, and samples of the atmosphere in the vicinity of the electrical components and, Y& g4 ~5 w5 G) x$ o$ |
around the equipment are taken to determine the concentration of flammable vapours present.
" F' u( ~ C4 g" h& Q5 s; DSamples of the atmosphere are taken at 4 min intervals; four samples to be taken during D% N+ _# r( ?% i! }! ~; a% e
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
8 X; |- P! t& j) p. y5 x& \$ f0 Pincreasing, samples shall continue to be taken at 4 min intervals until the concentration is! X' q6 ^7 _# j' j
shown to be decreasing. m9 b$ g& f. O/ A$ o0 f
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If an abnormal operation of the equipment is possible with any of its fans not running, this
2 O, o1 ~& L6 r2 @! \; rcondition is simulated during this compliance test. |
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