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From: cuhulin on 7 May 2010 13:10
On the web,
Wild Well Control

As little as I know about that, (next to nothing) no harm in reading up.

Why can't there be two for one, two BOPs in one unit, in case one fails?
It would cost more money, but it might save some lives.
cuhulin

From: hls on 7 May 2010 21:35

"chuckcar" <chuck(a)nil.car> wrote in message

If fact it *has* to be lower because you can't pump
> any liquid more than about 30 feet down. An impeller or pump on the top
> of their jury rig may help, but then you have the problem of the hundreds
> of feed of pip you're pushing the oil up.


Sorry guys, I needed to answer this.

Only very simple lift pumps are restrained by this atmospheric pressure
limitation.

To wit, atmospheric pressure is on the average of 14.7 psi. The static
pressure
of water (not brine) is 0.433 psi, meaning that a simple lift pump can pull
a
hydrostatic head of (14.7/.432) or about 34 feet.

But the fact is that this type of pump is not at all used in this sort of
installation.

Subsea electrical submersible pumps (or similar) can pump against many
hundreds or thousands of pounds of pressure, at very high delivery rates.

The dissenting poster needs to study the technology that he is so aggressive
in denouncing.


From: Pete C. on 7 May 2010 21:44

hls wrote:
>
> "chuckcar" <chuck(a)nil.car> wrote in message
>
> If fact it *has* to be lower because you can't pump
> > any liquid more than about 30 feet down. An impeller or pump on the top
> > of their jury rig may help, but then you have the problem of the hundreds
> > of feed of pip you're pushing the oil up.
>
> Sorry guys, I needed to answer this.
>
> Only very simple lift pumps are restrained by this atmospheric pressure
> limitation.
>
> To wit, atmospheric pressure is on the average of 14.7 psi. The static
> pressure
> of water (not brine) is 0.433 psi, meaning that a simple lift pump can pull
> a
> hydrostatic head of (14.7/.432) or about 34 feet.
>
> But the fact is that this type of pump is not at all used in this sort of
> installation.
>
> Subsea electrical submersible pumps (or similar) can pump against many
> hundreds or thousands of pounds of pressure, at very high delivery rates.
>
> The dissenting poster needs to study the technology that he is so aggressive
> in denouncing.

The suction lift is measured from the surface of the liquid to the pump,
the amount of pipe under the surface of the liquid has no bearing on the
suction lift as the liquid pressures are balanced regardless of that
depth. The length of the subsurface pipe is only relevant to frictional
velocity losses.
From: hls on 8 May 2010 08:48

"Pete C." <aux3.DOH.4(a)snet.net> wrote in message news:4be4c341$0$16324
> The suction lift is measured from the surface of the liquid to the pump,
> the amount of pipe under the surface of the liquid has no bearing on the
> suction lift as the liquid pressures are balanced regardless of that
> depth. The length of the subsurface pipe is only relevant to frictional
> velocity losses.

Quite correct, and I should have mentioned this. I was just going after
his 30 foot statement.


I dont know what they plan to do with the oil they evacuate from this
leaking system anyway. If they have to pump into a tanker that might
present lift heights greater than some 10 meters, then they would still have
to use a positive displacement pump. Since they would be lifting oil, with
a lower density than water, the 30 foot rule of thumb would be somewhat
higher.

From: chuckcar on 8 May 2010 09:51
"hls" <hls(a)nospam.nix> wrote in
news:TrCdnTCKtNRUInnWnZ2dnUVZ_t6dnZ2d(a)giganews.com:

>
> "chuckcar" <chuck(a)nil.car> wrote in message
>
> If fact it *has* to be lower because you can't pump
>> any liquid more than about 30 feet down. An impeller or pump on the
>> top of their jury rig may help, but then you have the problem of the
>> hundreds of feed of pip you're pushing the oil up.
>
>
> Sorry guys, I needed to answer this.
>
> Only very simple lift pumps are restrained by this atmospheric
> pressure limitation.
>
> To wit, atmospheric pressure is on the average of 14.7 psi. The
> static pressure
> of water (not brine) is 0.433 psi, meaning that a simple lift pump can
> pull a
> hydrostatic head of (14.7/.432) or about 34 feet.
>
> But the fact is that this type of pump is not at all used in this sort
> of installation.
>
> Subsea electrical submersible pumps (or similar) can pump against many
> hundreds or thousands of pounds of pressure, at very high delivery
> rates.
>
*And* counteract 5,000 feet of oil with gravity working on it as well?


--
(setq (chuck nil) car(chuck) )
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