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标题: DSH 308 Table 3- Temperature limits [打印本页]
作者: 小米    时间: 2012-9-19 14:51
标题: DSH 308 Table 3- Temperature limits
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DSH 308' O" X) i" c4 ~4 P
Table 3- Temperature limits
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4 O9 w8 }: X. A3 OStandard:
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Sub clause:
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' h0 c0 F2 X" ?1 _# vSheet n. 308
9 G; L1 j' c" q' z, \- ?Page 1(1)
7 l3 Z1 g4 x# D* R+ sSubject:- W( V# w0 j6 X# x0 E; ^
Table 3 - Temperature limits
  T! Z& O' B$ p. j6 O# lKey words:
# a; U$ [+ a9 p" W* j- Fire point
- ?9 }1 `; G' A* K( \- Temperature
" Y5 _% ]- |+ o/ M2 _" XDecision taken by$ ~' C8 c! J4 y. f/ x2 v
ETF3 and confirmed
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meeting, in Toronto* W/ |. h5 J9 o: [
Question:
$ T9 k6 l( l1 z# `0 t. F& ?" qHow can the requirements of this clause be used for parts in contact with liquids. Where can. G5 _4 l8 h  k8 D" s
the figures for Fire Point be obtained?: g! T$ A) G' Y3 n
Decision and Explanation4 `4 k5 M; U, q, n* \$ C
This requirement should only be applied where a hazard may arise.
6 G! K1 F' M$ d, j* q5 R: `% hFigures for fire point are available in ANSI/NFPA 497-1997, published by the National Fire
! `" l2 R1 b/ K$ h2 ?5 BProtection Association, Quincy, Massachusetts, USA.1 D& ~4 n7 s0 O% ~! n
Table 2-1 of NFPA 497 identifies flash points, autoignition temperatures7 A  a" a, _; w: i3 x2 h+ g: L
(fire points), lower and upper flammable limits (in %), vapor densities,
4 R. x0 v, I" Mvapor pressures, minimum ignition energies, minimum ignition current ratios,5 S8 E8 K' c: g& s4 _
and maximum experimental safe gaps of approximately 225 common liquids and
4 j1 j3 Y& y: k% K& w. U# w3 mgases.
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