Conversion Charts


Fraction to Decimal Conversion Chart


Maximum Recommended Air Flow (SCFM)
Through ANSI Standard Weight Schedule 40 Pipe

The flow values in the table below are based on a pressure drop of 10% of the applied pressure per 100 feet of pipe for 1/8”, 1/4”, 3/8” and 1/2” pipe sizes; and a pressure drop of 5% of the applied pressure per 100 feet of pipe for 3/4”, 1”, 1-1/4”, 2”, 2-1/2”, and 3” pipe sizes. The table gives recommended flows for pipe sizes at listed pressures and should be used to determine appropriate piping for air systems.

Water Discharge Table

This table is intended for general reference and general applicability only, and should not be relied upon as the sole or precise source of information available with respect to the subject covered. The user should also refer to and follow manufacturer’s specific instructions and recommendations with regard to such information, where they exist.
Flow of water through 100 foot lengths of hose, Straight-Smooth Bore – U.S. Gallons per minute
Figures are to be used as a guide since the hose inside diameter tolerance, the type of fittings used, and orifice restriction all influence the actual discharge. Thus, variations plus or minus from the table may be obtained in actual service.

Pipe and Flange Dimensions

Dimensions of Seamless and Welded Steel Pipe
ASA-B36.10 and B36.19

Dimensions of 150 LB. ASA Steel Flanges

Dimensions of Tank Truck Flanges (TTMA Drilling)

Feet of Water to Inches of Mercury Conversion Table


Thread Dimensions

Nominal Dimensions of Standard Threads

Normal Engagement Length of NPT Thread in Inches (“A”)

Cam and Groove Nominal Take-Up Lengths

Abbreviation System Name Compatibility Seal Method
BSPP British Standard Pipe Parallel Male BSPP with Female BSPP
Female BSPP with Male BSPP
Female BSPP with Male BSPTr
Washer
Washer
Washer
BSPTr British Standard Pipe Taper Male BSPTr with Female BSPTr
Male BSPTr with Female BSPP
Female BSPT with Male BSPTr
Female BSPTr not compatible with Male BSPP
Thread
Washer
Thread
CHT American Standard Fire Hose Thread (1" National Hose Thread is Chemical Hose Thread, also knows as Booster Hose Thread) 1" Male NH (NST) with 1" Female NH (NST)
1" Female NH (NST) with 1" Male NH (NST)
1" Thread is used on both 3/4" hose and 1" hose.
Not compatible with other systems
Washer
Washer
GHT Garden Hose Thread Male GHT with Female GHT
Female GHT with Male GHT
Thread is same for all size hoses
Not compatible with other systems
Washer
Washer
IPS Iron Pipe Straight Thread Generic Name for Straight Pipe Thread
See NPSH for compatibility
Washer
JIC Joint Industrial Committee Used with other mating JIC threads Mechanical
NH or NST American Standard Fire Hose Coupling Thread (National Hose thread also known as National Standard Thread) Male NH (NST) with Female NH (NST)
Female NH (NST) with Male NH (NST)
Not compatible with other systems
Thread pitch and diameters of fire threads may vary according to local and municipal regulations. Consult Factory.
Washer
Washer
NPT American Standard Taper Pipe Thread
(National Pipe Tapered)
Male NPT with Female NPT
Male NPT with Female NPTF
Male NPT with Female NPSM
Male NPT with Female NPSH
Female NPT with Male NPT
Female NPT with Male NPTF
Female NPT not compatible with Male NPSM or Male NPSH
Thread
Thread
Washer
Washer
Thread
Thread
NPTF American Standard Taper Pipe Fuel Dryseal Thread (National Pipe Tapered Fine) Male NPTF with Female NPTF
Male NPTF with Female NPT
Male NPTF with Female NPSM
Male NPTF with Female NPSH
Female NPTF with Male NPTF
Female NPTF with Male NPT
Female NPTF with Male NPSM or NPSH
Note: NPTF with NPTF threads do not require sealant for the initial use. After that, sealant is required.
Thread
Thread
Washer
Washer
Thread
Thread
Not Compatible
NPSH American Standard Straight Pipe for Hose Couplings (National Pipe Straight Hose) Male MPSH with Female NPSH
Female NPSH with Male NPSH
Female NPSH with Male NPT
Female NPSH with Male NPTF
Female NPSH with Male NpSM
Washer
Washer
Washer
Washer
Washer
NPSM American Standard Straight Mechanical Joints (National Pipe Straight Mechanical) Male NPSM with Female NPSM
Male NPSM with Female NPSH
Female NPSM with Male NPSM
Female NPSM with Male NPT
Female NPSM with Male NPTF
Seal can be either mechanical or washer. Mating fittings must be of same type.
TIPT Tapered Iron Pipe Thread Generic name for Tapered Pipe Thread Thread
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