BOC Edwards 18B4B, Инструкция по эксплуатации, Страница: 7 / 62

Feb 04 Issue A
18B4B Vapour Booster Pumps
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1 INTRODUCTION
1.1 Scope and definitions
This manual provides installation, operation and
maintenance instructions for the BOC Edwards
18B4B Vapour Booster Pumps. You must use the
pumps as specified in this manual.
Read this manual before you install and operate your
pump. Important safety information is highlighted as
WARNING and CAUTION instructions; you must
obey these instructions. The use of WARNINGS
and CAUTIONS is defined below.
In accordance with the recommendations of
IEC1010, the following warning symbols may appear
on the pump or its accessories:
The units used throughout this manual conform to
the SI international system of units of measurement.
WARNING
Warnings are given where failure to
observe the instruction could result
in injury or death to people.
CAUTION
Cautions are given where failure to observe the
instruction could result in damage to the
equipment, associated equipment and process.
Warning - refer to accompanying
documentation.
Warning - risk of electric shock.
Warning - hot surfaces.
The pump identification and rating plate (Figure 3,
item 12) provides specific details about the pump,
including: pump type; part number and serial
number; name and address of manufacturer; and so
on.
1.2 Description
The 18B4B pumps are high performance vapour
booster pumps, and have pumping speeds of up to
4000 l s
-1
.
The pumps are rugged and reliable and have high
performance even with relatively high backing
pressures.
Three versions of 18B4B pumps are available, with
different inlet and outlet flanges: refer to
Section 2.8.
1.3 Construction
Refer to Figure 1 which shows a part-sectional view
of the 18B4B pump. The pump has:
• A vertical top cone assembly (45) which
incorporates the three diffusion pump stages
(42, 6 and 5).
• A horizontal side cone assembly (14).
• A boiler (33), which forms part of the base of
the pump.
• A ‘T’ piece (38), which connects the top cone
(45), the side cone (14) and the boiler (33).
• A vertical backing condenser (17), which
incorporates a baffle assembly (18).
The diffusion pumping jet stages have top (5),
second stage (6) and lower (42) vapour tubes, each
of which has a jet cap (47, 44, 43). The top jet cap is
covered by a guard ring (2), which minimises the
backstreaming of pump fluid.
The lower vapour tube is bolted to the ejector stage
‘T’ piece (38), and the ‘T’ piece is bolted to the
boiler assembly (33), through flanges to allow easy
access for cleaning.