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commonly referred to as a
Butterworth cover. Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.
116:
and other marine vessels used for transporting fluid products, there are small service openings though the deck into each tank to allow access for miscellaneous reasons such as sampling, inspection, gauging and cleaning. When the service opening is not in use, it is sealed by a removable cover plate,
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Vapor accidents can occur when pressure builds up in the tank below and the
Butterworth cover is carelessly removed. Butterworth hatches have been responsible for a number of marine losses. In the
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Wang, Y. F.; et al. (2011). "Investigations of Human and
Organizational Factors in hazardous vapor accidents".
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297:"Cargo tank hatches, ullage holes, and Butterworth plates, 46 CFR ยง35.30-10"
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that is used to seal a small opening that admits to the space below.
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41:
162:. Xlibris for Southern Marine Technical Services, LLC. p. 79.
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Jones Jr., John P "Cover plate having adjustable latch means"
304:"Trunks, domes, and openings of cargo tanks, 46 CFR 153.256"
191:. Burlington, Massachusetts: Butterworth-Heinemann. p.
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217:http://www.freepatentsonline.com/4059202.html
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272:Proceedings of the Merchant Marine Council
160:Southern Marine Engineering Desk Reference
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81:Cleaning nozzle in Butterworth hatch
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142:"Ship Terms and Definitions"
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263:Wikborg, Thorolf (1962).
183:Eyres, David J. (2006).
158:Ekenes, Rolf N. (2009).
35:, as no other articles
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107:cargo vessel
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59:October 2016
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301:, see also
114:oil tankers
317:Categories
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50:; try the
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