Simon_Jester wrote:Have you?
Oh yes. In fact I have maps that I use quite frequently that show the oil transmission and electrical power generation grids across the entire region. Very detailed maps
Now, there are four ways one can move crude oil (or refined oil products) around in bulk. These are
If we go to 1940, there are two pipelines that run from the oil fields in Persia (the only ones that matter at this time). One goes across Iraq and northern Syria to Haifa, the other follows the same route mroe or less (it's further north) and ends up in Beirut. The first was built and run by the British, the second by the French. Botha re dependent on a chain of pumping stations that are numbered along the line (for example, on the southern line they are H-1 to H-9, the H standing for Haifa). Over the years these have developed into significant communities, H-5 is - or was - for example a major Iraqi military base area. Note that these pipelines terminale on the extreme eastern edge of the Mediterranean. It is a rock solid certainty that neither pipeline would survive a German invasion. Both would be blown up along with their pumping stations. As a casulat estimate, it would take at least five years to rebuild them and the oil still only gets to the eastern edge of the Mediterranean. To get the oil any further, the Germans would have to build a pipeline through Turkey, around the Black Sea, through the Caucasus and then hook up with the existing pipeline net. This would take at least ten to 15 years and predicates the conquest of the appropriate areas of Russia - which is, as the Germans found out, easier said than done.
This takes us to ships. Specifically tankers. These were rare commodities in the 1940s, in fact tankers were a major bottleneck for everybody except the German. Why were they not a bottleneck for the Germans? Because they didn't have any and one can't have a bottleneck in a supplyline that doesn't exist. The few real tankers the Germans had were being used as supply ships for their fleet. So, the Germans would have to switch most of their naval construction effort to building tankers, lots of them. That clobbers their warship construction programs very hard and there isn't much slack. About the only programs that could be cut would be the U-boat effort and the minesweeper effort. So, to get the tankers the Germans need, they would have to slash the U-boats and that takes the pressure off the Brits and their minesweepers and that means their ports get dangerous to use. Having accepted that cost, how do the tankers get used (and, by the way, we have to decide that before building them - I'll come to why later). The oil is in Persia. To tanker it back all the way means going down the gulf, down the coast of Africa (one can take for granted teh Suez Canal is either blocked or access denied), around the Cape, back up the coast of Africa, around Europe, through the Channel or North Sea and then to ports either in France or Germany. The Royal Navy mighty have something to say about that. In fact, a handful of submarines stationed in South Africa would cut that lifeline stone dead. The other option is to pipeline the oil to the east coast of the Mediterranean and tanker it from there to ports in southern France and Italy. Now this is a lot shorter and simpler. It's probably less dangerous. But, here's the catch. It needs a fundamentally different type of tanker. Going around the Cape needs a big, long-range ship with large fuel supplies and a sea-kindly hull. That kind of ship is limited in what ports it can use. To work in the med,w e need a small tanker with very limited own-fuel supplies and limited crew facilities. It doesn't go far after all. It's a much cheaper tanker to build and use, only it cannot do the Cape run. So teh Germans have to decide which type of tanker to build - and they have to decide that a year of so in advance. If the Germans opt for the Cape tankers, they have a small fleet of large ships that are very uneconomic to operate in the Med. If they go for teh Med tankers, they have a large fleet of small tankers that cannot operate anywhere else. Then the pipelines get blown up. Ouch. We also have a "number of tankers" problem
From the Gulf to ports in Northern France is 8,283 nautical miles (that right there means a big tanker just to carry the fuel for the trip). The return trip, therefore is 16,566 nautical miles. Back in the 1940s, a tanker did around 8 knots, some fast tankers did twelve but they were expensive beasts and most of them ended up as unreps or got converted to carriers. So, to do the round trip required 16,566/8 = 2,070.75 hours or 86 days. Say, one trip every three months allowing for loading and unloading. According to "The Strategic Bombing of Germany", Germany required to import 968,000 tons of oil per month. One of these big tankers carries around 25,000 tons of crude oil. Therefore, German needed 38.72 tankers per month to arrive in its ports. But, each tanker needs three months to do a round trip. So, a total fleet of 116.16 tankers is needed to keep Germany supplied with oil. Call it 120 to allow for down time and retrofits. It takes around a year to build each tanker and there are ten shipyard slips in Germany and France capable of building ships of this type. So, it will take twelve years to build the tanker fleet.
So, let's try by rail. Problem. There are no rail lines. They'll have to be built. This is not easy. We're not speaking of jury-rigged lines here for passenger transport. Narrow-gauge singkle track lines will do for them. We're talking about heavy-duty, double-track lines a capable of carrying massive freight loads. Those who live in the States, look at an American freight train; that's the consist we're talking about. This will be a massive construction effort. The lines have to be driven north to hook up with the existing freight network and there's rough ground in the way.
Roads next. There aren't any. There are tracks and gravel roads but they won't take the hammering handed out by heavy trucks (again, remember this is 1940). Heavy trucks back then carried 10 tons of cargo, equal to 73 barrels of oil or 4,015 gallons of oil. Now, it's roughly 1,250 miles from the oilfields to the rail network. That's a 2,500 mile round trip. Trucks that existed then on that kind of road got around 8 miles to the gallon (if they were lucky. So, they burned 300 plus gallons of fuel just to make the trip, reducing deliveries to around 3,750 gallons or 9.3 tons of oil. This means 104,086 truck loads of oil need to arrive in Germany every month. However, to make the 2,500 mile round trip, a truck takes 10 days (driven continuously). In fact that can't happen. Truck availability varies but assuming its 1/3, we can assume that each truck makes one round trip per month. So, we need a total of approximately 100,000 trucks to keep the supply line open. But, trucks wear out. (Ships and trains don't, not in the timescale we're looking at). A truck lasts, on average, 100,000 miles and given the hammering we're talking about here, that's really generous. That's 40 trips or 40 months. So, to support the truck fleet, Germany is looking at building 2,500 heavy trucks per month just to keep the supply line running. German heavy truck production was around 7,000 per year or just under 600 per month. So, they would have to quadruple their heavy truck production and derpive the army of all its heavy transport just to get the oil from the oilfields to the railways.
Aha one says. Why use heavy trucks, why not use smaller ones? Well, the cargo capacity of a medium truck is around 2.5 tons or roughly 1,000 gallons of oil. That means they can deliver only 700 gallons or 1.75 tons of oil. The fleet needed would be 553,142 trucks and a production rate of 13,828 medium trucks per month. German medium truck production was around 28,000 per year or (very approximately) 2,500 per month. (By the way, the German Army lost 109,000 trucks during the Battle of France 1940). So teh medium truck shortfall more than five times production.
So, teh Middle East oilfields do Germany no good at all. They can't get here from there.