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发表于 2011-3-4 12:47
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来自: 中国上海
回复 ablelin67
谢谢你-ablelin67,但我还有两事不明?
“minimum flow to hot well管路用于 ...
T_tong 发表于 2011-3-4 09:02
5.5.2 Feed Piping
5.5.2(a) Valves. The feed line to each boiler is to be fitted with a stop valve, in accordance with
4-4-1/9.5.3(b). A stop check valve is to be fitted as close as possible to this stop valve. However, a
feed water regulator may be installed between the stop check valve and the stop valve, provided it
is fitted with a by-pass as in 4-6-6/5.5.2(c).
5.5.2(b) Duplicated feed lines. For group-feed systems, two independent feed lines are to be
provided between the pumps and each boiler. However, a single penetration in the steam drum is
acceptable. In the case where the two feed lines are combined to form a single penetration at the
boiler, the screw down check valve in 4-6-6/5.5.2(a) above is to be installed in each of the two
feed lines. For boilers with unit-feed systems and where two or more boilers are installed, a single
feed line between the pumps and each boiler will suffice.
5.5.2(c) By-pass arrangements. Feed-water regulator and feed-water heaters, where fitted in the
feed piping, are to be provided with by-pass arrangements so as to allow their maintenance
without interrupting the feed water supply. By-pass for feed-water regulator is not required if it is
the full-flow type. |
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