Henry's turbopump system used with the modified pizza oven is a HiCube 80 Eco, Turbo Pumping Station from Pfeiffer.

Manuals
Compact FullRange Gauge
Electronic Drive Unit
HiPace 80 Turbopump
Display and Control Unit
HiCube 80 Eco Turbo Pumping Station
MVP 015-2 Diaphragm Pump

Rich added a cross to allow more items to be connected. The image below shows the pumping station with the cross attached and the connection types and sizes.

We have decided that any options that we'll be attaching to the system will be KF25. We have an adapter going from CF40 to KF25 on the right side that is then connected to the hose that goes to the oven. We'll put the same adapter on the left side of the cross and use a gauge with a KF25 connection. Finally, we'll add an adapter that goes from CF63 to KF25 to the top of the cross for anything else we might want to connect. With these adapters and the connections we have on the cross, we should be able to connect anything we want.

The pump is connected to the insert in the oven using Swagelok VCR connectors. Basically, this is connecting two threaded pipes together. A VCR gasket is used between the two pipes. Our insert has a 3/4" VCR connection coming out of the back, which is the connection to the pump. There is also a 1/4" connection on top of the insert on the front of the oven which is where the nitrogen gas will be hooked up.

1/4" VCR connection for nitrogen

3/4" VCR connection for pump

Note that there is a gauge connected to a T off the 3/4" VCR connection. The maximum operating temperature for this gauge is 55C.

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Basic types of fittings for pumps.

Conflat Flange (CF)	Quick Flange (KF)	ISO Flange (ISO)	Swagelok VCR
Conflat flanges are connected with bolts	Quick flanges are connected with a clamshell connector	ISO flanges are connected using clamps with hooks	VCR connections are threaded

The Conflat Flange system uses a copper gasket between the two flanges that are then screwed together with bolts. When a conflat flange is taken apart, the gasket should be replaced with a new one.

Sometimes CF flanges are listed by their CF number, other times by the size in inches.

Inches	CF Number
1 1/3"	CF16
2 3/4"	CF25
4 1/2"	CF63
6"	CF100

Conflat flanges are connected with a copper gasket between the flanges that are bolted together. The image below showswhat a new gasket looks like (still in the package) and a used gasket. Note that the used gaskets should not be reused after the flanges are separated. The used gasket will have an indentation where the flanges grabbed into it.

The quick release flange is known by a number of different names: Quick Flange (QF), Klein Flange (KF), NW and sometimes DN. KF is the most common. This system uses a centering ring with a built-in O-ring inside of a clamp holding everything together.

Sample O-ring gasket for KF

VCR connections are threaded and require a gasket between the fittings. Gaskets can be made out of nickel, stainless steel or copper. In our system, we're using stainless steel gaskets. We need two sizes 1/4" and 3/4" for the two VCR connections.

The gaskets must be checked with a microscope before being installed. If any dust or scratches are seen on the surface, the gasket will leak. Here is a sample gasket, still in its packaging.

The ISO flanges tend to be used for larger sizes. The smallest ISO flange is 63.5mm. They are held together using clamps that hook onto the flanges or screws that go through the flanges, with a copper gasket between them.

ISO gasket in flange