Talk:Blowout preventer

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The mainpage says the first BOP was developed in 1924. This article says there are two types with the first being developed in 1932. Assuming the dates given are correct, that would mean that the BOP from 1924 is a different type, and this article should make that clear, and note that the two mentioned are the only ones currently in use (if that is truly the case). I don' t know enough about this subject but it is clear that the dates given are incorrect and/or there are more than two types of BOP. Since this device's importance is specifically mentioned on the mainpage it would be nice to get this straightened out.

Fixed.--Father Goose 08:19, 7 August 2006 (UTC)

[edit] failure methods

Some of the API requirements mention that the hydraulic actuators must fail closed- they must be spring closed and compressed air opens them. How does this work with the shear type of valve? It seems like a last-ditch type of valve. Is air pressure always maintained with redundancy for these valves? —Preceding unsigned comment added by Dj245 (talk • contribs) 21:26, 2 January 2008 (UTC)