Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
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March 09<br />
APPENDIX C - COOLING WATER HEAT EXCHANGER<br />
SEAWATER/FRESHWATER TYPE FG 1603877-5: PART GE098<br />
Description<br />
1. The heat exchanger consists of a shell, tube stack <strong>and</strong> end covers sealed by ‘O’ ring seal held in<br />
place by an end cover, which secures the seal against three faces; the body, the tube plate <strong>and</strong> the<br />
end cover.<br />
2. Shell - Comprises an aluminium casting, fully machined to accept the tube stack.<br />
3. Tube Stack - Comprises naval brass tube plates, between which are the tubes. Theses are punch<br />
exp<strong>and</strong>ed <strong>and</strong> bonded in place by soldering. The tube material is cupro-nickel. The freshwater is<br />
guided over the tube by a series if baffles arranged along the length of the tube stack. Baffles are<br />
of the radial flow type <strong>and</strong> constructed from aluminium.<br />
4. End Covers - The end covers are manufactured in gun metal <strong>and</strong> incorporate the cooling seawater<br />
inlet <strong>and</strong> outlet connections.<br />
5. O-Ring Seals - The material of the O-Ring seals is nitrile.<br />
Installation<br />
1. It is important that air is kept out of the system, particularly on the fresh water side. Aerated water<br />
can cause erosion of the tubes. Heat exchange should be piped for counter flow. The cooling<br />
water inlet should be on the lower connection <strong>and</strong> outlet the upper connection. Always circulate at<br />
the recommend sea water <strong>and</strong> fresh water flows. Excessive flow can also cause corrosion <strong>and</strong><br />
erosion.<br />
Duty Flow Fresh Water 10 imp galls/min<br />
Sea Water 16 imp galls/min<br />
Pressure Fresh Water 17 lbf/in 2 1.3 Bar<br />
Sea Water<br />
Heat Exchange Rate<br />
Connection<br />
Weight<br />
30 to 45 lbf/in 2 2 to 3 Bar<br />
1500 BTU/min<br />
1 1/4” BSP<br />
18Kg<br />
OM002 Rev 5 Page 142 of 168 Chap 9