Refueling a 777-300ER

[Highlander 1459]

I stated the question simply so the answer could be calculated simply.

honestly, the question isn't as simple as it could have been.
it requires converting minutes to hours
and it lacks brevity because the aircraft and type is unnecessary to perform the calculation

since you are one of the mods, why dont you rewrite it without the plane and put it in the General Off Topic section?

 

[jhellwig]

I didn't ask the question about internal transfer pumps; it came up as a side topic in post #13.

The question was based on the total tank volume for totally empty tanks, undoubtedly.

Yeah I know it was a side topic. Just wondering. What is the true usable tank volume?

I didn't get done editing my post before you posted.

 

[Rand]

This question is simple.
therefore you have everyone thinking there is a catch somewhere.
2.51 hours

 

[Rand]

2.50995 hours or, 150.5974 minutes. I can't believe it is that slow.
Is that fuel load for a short hop? Like Seattle to San diego?
Maybe what 5 or so hours of fuel?

This isnt a situation you would see in the real world between flights etc.
IIRC they can use dual hose and do aprox double that refueling rate.. only take on needed fuel+ reserve , and are never empty.

This is more how long does it take to fill the bathtub with a faucet supplying 5gpm type question.

 

[y_p_w]

This isnt a situation you would see in the real world between flights etc.
IIRC they can use dual hose and do aprox double that refueling rate.. only take on needed fuel+ reserve , and are never empty.

This is more how long does it take to fill the bathtub with a faucet supplying 5gpm type question.

I've been on a long haul flight on a widebody. I wouldn't think they would normally have a short turnaround time unless it was just another short domestic hop. If it takes an hour to refuel, I don't see that being a problem. How long does it normally take for crew to clean up anyways? It's all done at the same time.

 

[MolaKule]

This question is simple.
therefore you have everyone thinking there is a catch somewhere.
2.51 hours

Right!

A simple answer to a simple question! Let's keep on topic here or we'll close it.

 

[MolaKule]

It can’t take more than 1 hour in real operations.

https://simpleflying.com/boeing-777x-30-minute-turn-around/

Turnaround time for a plane with residual fuel would be less than one with totally empty tanks.

One usually adds only enough fuel to make it to one or more destinations with added fuel as a safety margin for loitering, missed approaches, etc.

 

[MolaKule]

Yeah I know it was a side topic. Just wondering. What is the true usable tank volume?

I didn't get done editing my post before you posted.

The volume would be sufficient to hold 47,000+ gallons but that was not part or parcel of the question.

 

[MolaKule]

honestly, the question isn't as simple as it could have been.
it requires converting minutes to hours
and it lacks brevity because the aircraft and type is unnecessary to perform the calculation

since you are one of the mods, why dont you rewrite it without the plane and put it in the General Off Topic section?

Because it involved aviation and it was a very simple and brief question that required a very simple calculation.

 

[Just a civilian pilot]

Turnaround time for a plane with residual fuel would be less than one with totally empty tanks.

One usually only adds only enough fuel to make it to one or more destinations with added fuel as a safety margin for loittering, missed approaches, etc.

We always carry 5% contingency factor ( of the burn ) extra fuel, min.

 

[Variant_S]

... it lacks brevity because the aircraft and type is unnecessary to perform the calculation

This is just extraneous information. It is meant to discern if the person working the problem can identify what is relevant.

 

[MolaKule]

This is just extraneous information. It is meant to discern if the person working the problem can identify what is relevant.

Besides, most people prefer an example in order to better visualize the problem.

 

[Jimmy_Russells]

I've been on a long haul flight on a widebody. I wouldn't think they would normally have a short turnaround time unless it was just another short domestic hop. If it takes an hour to refuel, I don't see that being a problem. How long does it normally take for crew to clean up anyways? It's all done at the same time.

Long haul flies to a destination (say 8-13 hour flight) and then almost immediately back all the time. Turn around usually about 2-3 hours.

 

[y_p_w]

Long haul flies to a destination (say 8-13 hour flight) and then almost immediately back all the time. Turn around usually about 2-3 hours.

But still long enough to refuel apparently.

 

[The_Eric]

Leave to BITOGers to waaaaay overcomplicate stuff! I'm surprised someone hasn't brought up time of day, storage temps of the bulk fuel, whether it was sunny or over cast (heating and the resulting viscosity change of fuel through the lines) the phase of the moon due to its gravitational effects and the amount of time or use on the transfer pumps which would in some small way diminish their effectiveness.. Gawd I love you guys

 

[Thermo1223]

Leave to BITOGers to waaaaay overcomplicate stuff! I'm surprised someone hasn't brought up time of day, storage temps of the bulk fuel, whether it was sunny or over cast (heating and the resulting viscosity change of fuel through the lines) the phase of the moon due to its gravitational effects and the amount of time or use on the transfer pumps which would in some small way diminish their effectiveness.. Gawd I love you guys

Here I was just assuming 4+ hours due to required union breaks!

 

[ripcord]

Is the ground crew part of a union?

Edi

 

[y_p_w]

Leave to BITOGers to waaaaay overcomplicate stuff! I'm surprised someone hasn't brought up time of day, storage temps of the bulk fuel, whether it was sunny or over cast (heating and the resulting viscosity change of fuel through the lines) the phase of the moon due to its gravitational effects and the amount of time or use on the transfer pumps which would in some small way diminish their effectiveness.. Gawd I love you guys

All the basic numbers were provided, but the original post didn't note that each wing tank can be refueled separately.

 

[I<3oil]

Is the ground crew part of a union?

Edi

In that case, 2.3 days

 

[y_p_w]

Here's a vid of a 777-200ER being refueled. However, the caption claims a maximum rate of about 1600 gallons per minute. I believe it's 2 connections per wing.