Nominal bore?

yes it is nominal bore

NB (Nota Bene) translated from latin to english is "Note Well".

Not sure where the 1" comes in...

I am normally opposed to cutting and pasting from Wikipedia, but I just could not resist on this one:

"

NB

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NB, Nb, or nb may refer to:

• Abbreviation for nota bene, a Latin expression meaning "note well"
• The symbol for the chemical element Niobium

Places:

• New Brunswick, a province of Canada
• North Britain, a historical term for Scotland
• One of several towns named New Baltimore
• One of several areas named New Britain
• Sydney's Northern Beaches

In entertainment

• Nickelback a Canadian rock band
• N.B. (album), Natasha Bedingfield's second album
• "New Born", a song by the British band Muse
• Nickname of Niko Bellic, a fictional character in the video game Grand Theft Auto IV
• NB (television show), a Scottish TV programme presented by Janice Forsyth, Bryan Burnett and Alan Campbell

In science and technology:

• Netbook, a type of laptop computer
• NetBeans, an integrated development environment created by Sun Microsystems
• Naive Bayes classifier, in statistics, a simple probabilistic classifier
• Nominal Bore, a frequently used interchangeable term for Nominal Pipe Size (NPS)
• Northbridge (computing), a component on a computer motherboard

Other uses:

• New Balance, a shoe company
• Nigerian Breweries, a beverage company based in Nigeria
• Narrowboat, a particular size of water vessel found on English canals
• The ISO 639-1 abbreviation for the Bokmål written form of the Norwegian language
• 牛B (niúbī), a common word in Mandarin Chinese profanity

Note that both of the previous suggestions are included in the list...

When referring to pipe it's Nominal Bore

NB= NOMINAL BORE

AMR SOLIMAN

PETROJET-EGYPT

Hi.

Pipe size is given/specified in ' NB ' ie.nominal bore.

1" NB is 1" nominal bore pipe. But mind its out side dia. will 1.312" and wall thickness to be specified in 'Sch . No.' as per requirement.

Regarding 'Tube' size to be as 1",here tube outside dia. will be 1" only.

Thank you.

In the UK in the mid/late 1800's gas and water pipe manufacture was 'organised' by BS10. (British Standard number 10). This took the basis that the screw threads to join pipes needed to be standardised which meant that the OD (Outside Diameter) of pipes needed to be the same regardless of wall thickness which could vary to meet different pressure and corrosion requirements. These threads also had a single pitch so that one die could cut a big range of pipe sizes. To list these the naming convention of nb (nominal bore) was used. Producing to this new standard was a major marketting advantage and almost all gegeral purpose iping nowadays is to that standard. The French tend to use R1", and the Americans, bless them, use a different thread pitch just to inhibit the British imports at the time (Politics never did appreciate common sense) which they called NPT (National Pipe Thread). Unfortunately the Oil Industry developed in the USofA so they are now locked into using a different thread system causing considerable extra costs over the domestically adopted BS10 Nominal Bore system.

Answer is Nominal Bore. Pipes - Tubes if you are American are to pass fluids and the amount of fluid passed is directly related to bore size not outside diameter. The relationship between the bore and outside diamemeter i.e the wall thickness. determines the pressure that the pipe/tube will take.

So for pipes the bore was the importent dimension, however pipes/tubes are connected using the outside diameter so this must remain fixed and the bore is varied, hence the term "Nominal". The standards for Nominal Bore pipes/tubes all have common outside diameters but the wall thickness vary's. So typically a specification will be 1" N/B 12 swg. The USA specs. to the Imperial specs. are slightly different. USA uses NPT thread systems and the Imperial uses BSTPT.

As far as I am aware there is no metric equivlent and pipes/tubes are speced on outside diameter. In hydraulic systems (my filed) the use of nominal bore tube/pipe is largely redundant.

I hope this answers the question.

Regards

Oliver Dunthorne

NB means nominal bore in pipe terms. Pipes are typically formed, or extruded and a constant 1" cannot, and will not be guaranreed. Thus to get by the tiny imperfections (either side of 1") its called nominal bore 1"

What's the context?

My word, Again a load of posters grabbed keyboards, without understanding the post, and astounded us all by their literacy. ( and even googleness)

The "NB" is nominal bore, and equivalent to the more standard notation of "NPS." Both refer to the inside diameter of pipe. As such, the outside diameter will vary with the specific "pipe schedule," and thus the wall thickness of the pipe will change with pipe schedule. Check with your local pipe supply company for (what is usually) a complimentary Pipe Schedule chart.

Incorrect, the outside diameter does not change the wall thickness changes, thus the bore is 2 Nominal"

Oliver Dunthorne

I stand corrected

Nominal bore.

If you look in piping or tubing websites you will see that the pipe is called up by nominal bore sizes. The thickness is determined by the schedule. Usually a sch 40 pipe will have an internal diameter roughly equal to the nominal bore. the otside diameter does not change, but as the wall thickness increases for thicker pipes, the internal diameter decreases. A sch 80 pipe has a thicker wall than a sch 40.

Has this anything to do with the NB on the head of bolts? I though it has something to do with the tensile strengh of the bolt!

Please give the right answer

jurie sa

No Jurie, The NB on bolts are for "National Bolt" and the strengh is normally the number on the edge eg. 8 or 10. (this NB (National Bolt) is typical in SA, and i'm not sure where else one will find it.)

Well with no context I can guess at 1" No Bigger!

Please go to:

British sizes: Pipe Threads.... A standard thread that is used in pneumatics , hydraulics and plumbing. & American threads

Regards

There are thousands of results for NB. go to:http://www.abbreviations.com/abbreviations/NB/1

__________________
Ron, a Yankee by birth, a Mississippian by choice

NB mean Nominal Bore

Dear,

NB relates to the specification of the pipe in B.S. system.

The NB is meant for Nominal Bore, ie "inside diametre" of a pipe in inches.