[AT] Russian Metric uses BSPP

[James Peck]

Some years ago I read an article in, perhaps, Design News, about a Deere plant in Georgia. This may be the plant. A Parker Hannifin dealer was kitting all the hydraulic hoses and fittings for a particular tractor model and packing them in a flip top plastic container. The JD factory needed only tell the distributor how many of each model they were building. The kit would go down the assembly line with each tractor and the parts were removed from the box only to install them.

I would not be surprised if they were using zero NPT fittings. Another downside to NPT is that the distance that fittings go together changes depending on such things as the threading die adjustment.

https://www.deere.com/en/campaigns/ag-turf/augusta-stories/

Full disclosure: I did work for a Parker systems integrator for awhile.

[ James Peck]Some of these fittings connect JIS Japanese Industrial Standard thread to BSP.

https://www.Parker.com/literature/Tube%20Fittings%20Division/JIS_Fittings.pdf

For industrial equipment hydraulics I have used NPT pipe, steel tubing with a variety of fittings including O ring face seal, steel pipe with welded on flange fittings, and hose with a variety of fitting. I also have never seen metric pipe with tapered threads including BSPT.

https://www.mainmanufacturing.com/

[Bradford] John's experience is the same as mine. All the European wine equipment are metric, DIN, and IEC components but all the pneumatic and water fittings are usually plain ol' NPT. I initially expected 'metric' pipe. No such animal.
An exception are DIN fittings which are in MM. But those same DIN ends and nuts were used on inch size stainless sanitary tube. BSP is the PITA of the lot. One Italian company, a DE filter, used 80 DIN (3") non-taper ball valves with BST. From the factory the threads are wrapped with what looks like oakum and those suckers are tight. There's something from the dark ages. Perpetually difficult to get to seal and trying to orient the valve handle in a useful place was difficult at best. Solution? Cut the straight threads off and weld on I-Line fittings, which 99% of hoses and fittings are in a winery. That or TC. Then a valve can be replaced in one minute. 

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