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DN

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Nominal  Diameter

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NPS

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Nominal Pipe  Size

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PN

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Nominal  Pressure

Pressure  Nominale

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in

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inch

1 in = 25.4 mm

USgal

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US gallon

1 US gallon = 231 in.³

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1 US gal = 3.7853 L

UKgal

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UK gallon

1 UK gal = 4.5449 L

gpm

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gal/min

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gallons per  minute

psi

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pounds per  square inch

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LB

LB = psi

lb/in²

lb/in² = psi

lbf

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pounds force

= 0.4536 kgf

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lb

lbm

pounds mass

= 0.4536 kg

U.S.ton

Short ton

= 907.2 kg

hp

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horsepower  (U.K.)

1 hp = 0.7457 kW

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lhp

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liquid  horsepower

bhp

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brake  horsepower

rpm

r/min

revolutions per  minute

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P

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poises

1 P = 0.1 Pa��s

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cP

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centipoises

1 cP = 0.001 Pa��s

cp

St

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stokes

1 St = 0.0001 m²/s

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cSt

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centistokes

1 cSt = 1 mm²/s

1 m²/s = 10⁶  cSt

�H

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Fahrenheit

= 5/9(�H-32)  (��)

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K

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Kelvin

= K-237.15 (��)

PID

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Piping &  Instrumentation Diagrams

P&ID

cap

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Pipe

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Tube

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