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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?6 e% R2 y' Z, O* c' E
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附上标准章节:
9 z8 _& I6 N a8 F. _4.3.12 Flammable liquids
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% v, G; h1 |* T8 J/ ?If a flammable liquid is used in equipment, the liquid shall be kept in a closed reservoir,
1 } b r( p# M- p5 }$ Lexcept for the amount needed for the functioning of the equipment. The maximum quantity of
; t" N7 l' s1 O* b4 e6 Jflammable liquid stored in an equipment shall in general be not more than 5 l. If, however, the
6 b, `2 a+ d0 pusage of liquid is such that more than 5 l is consumed in 8 h, it is permitted to increase the l, E! W4 E6 h# S% u
quantity stored to that required for an 8 h operation./ X7 Q# Z" G( Q% x
W% u& E4 C* }Oil or equivalent liquids used for lubrication or in a hydraulic system shall have a flash point6 P# p4 t, A, K K' S
of 149 °C or higher, and the reservoir shall be of sealed construction. The system shall have. u3 [+ D2 W5 X- B# v% H, ^9 m
provision for expansion of the liquid and shall incorporate means for pressure relief. This8 Y0 W& W {: m
requirement is not applicable to lubricating oils that are applied to points of friction in
) d) |0 R2 Y2 ?* p$ ^3 ?7 {$ Qquantities that would contribute negligible fuel to a fire.
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& ~. B$ U: R1 P/ x( hExcept under conditions given below, replenishable liquids such as printing inks shall have a
5 p' }2 Z" T. P0 bflash point of 60 °C or higher, and shall not be under sufficient pressure to cause atomization.
2 s! }8 q- Y- X( e6 `4 xReplenishable flammable liquids that have a flash point of less than 60 °C or that are under
6 ^ a4 g- z; qsufficient pressure to cause atomization are permitted provided inspection shows that there is9 w: u& P# |0 z$ P- d" L. @1 P
no likelihood of liquid sprays or build-up of flammable vapour-air mixtures that could cause
1 [) h8 h; b* q2 ^! Pexplosion or create a fire hazard. Under normal operating conditions, equipment using a5 U+ f1 b; w4 r/ u; ?
flammable liquid shall not generate a mixture with a concentration exceeding one quarter of
1 ]! R/ H5 ] y3 g9 Fthe EXPLOSION LIMIT if the mixture is in proximity to an ignition source, or exceeding half the4 w3 b1 c3 m/ @! ?
EXPLOSION LIMIT if the mixture is not in proximity to an ignition source. The investigation shall) [6 X/ W" [8 u3 P0 {6 l
also take into account the integrity of the liquid handling system. The liquid handling system
" d- r+ L8 I9 W* }2 ~( W- K5 bshall be suitably housed or constructed so that risk of fire or explosion is reduced, even under
9 w, {- @( E4 d3 y2 t r& @/ T9 T+ Uthe test conditions specified in 4.2.5.2 t! F g+ w: D6 T/ V) p5 l5 v: M
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Compliance is checked by inspection and, where necessary, by the following test.
# p# Q( c% p0 V1 J. e" `7 \The equipment is operated in accordance with 4.5.2 until its temperature stabilizes. In this+ s, r6 A! g* X3 Q/ r Z
condition, the equipment is operated in a normal manner, as directed in the operating: c e, u, E* k- v( h
instructions, and samples of the atmosphere in the vicinity of the electrical components and, A1 v( P0 X& O: `* C1 A
around the equipment are taken to determine the concentration of flammable vapours present., W- K+ g/ d1 j `( B9 @& s
Samples of the atmosphere are taken at 4 min intervals; four samples to be taken during( \8 \4 g# ], ]! U7 A
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
( I% S0 I7 s) B8 Z. D5 b0 C D3 ?increasing, samples shall continue to be taken at 4 min intervals until the concentration is. l* F2 l' B' B8 f+ z. d# ]( Z k
shown to be decreasing.
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% P0 s7 v0 @$ a5 G) w/ ?% d KIf an abnormal operation of the equipment is possible with any of its fans not running, this$ i; \" N" U9 g1 G
condition is simulated during this compliance test. |
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