PIPE: 马来西亚的首选 Metalok360 MFG Corp.

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Size & Dimension

Pipe Dimensions are covered in following Standards

ASME B36.10 – Welded and Seamless Wrought Steel Pipe (Carbon & Alloy Steel)
ASME B36.19 – Stainless Steel Pipe

Three different terms are commonly used to define the size of the pipe.

1. NPS – Nominal Pipe Size All American standard used NPS designation to define pipe size. This is a modern derivation of earlier IPS – Iron Pipe Size. NPS is not an OD or ID of the pipe it is in-between of the outer and the inner diameter of the pipe. For example, NPS 2 size pipe outside diameter is 60 mm or 2.375 inches. In general, NPS 12 and the smaller pipe has outside diameter greater than the size and for NPS 14 and above size pipe outside diameter is the same as the size in inches.

2. NB – Nominal Bore This is the European equivalent of NPS. In this standard pipe sizes are mentioned in millimeter

3. DN – Diameter nominal

In the below table, you can see the correlation of pipe size and OD.

NPS	1	1 ½	2	3	4	6	8
NB / DN	25	40	50	80	100	150	200
OD in mm	33.4	48.3	60.3	88.9	114	168	219

Material
ASME B31.3 provides the list of material that can be used in Process Piping. in below table, you can see the most commonly used material types & their Grades.

Carbon steel Used up to 425°c	Stainless steel Used for corrosive fluid	Low alloy steel Used for temp > (425°c)	Low temp carbon steel Used for temp < (-29°c)
A53 Gr B A106 Gr B API 5L Gr B	A312 Gr TP304 A312 Gr TP316 A312 Gr TP321	A335 Gr P2 , P12, P11, P22, P5, P9	A333 Gr 6

Applications
Duplex stainless steels are typically used in:

Chemical processing, transport and storage
Oil and gas exploration and offshore rigs
Oil and gas refining
Marine environments
Pollution control equipment
Pulp & paper manufacturing
Chemical process plant

Heat Resistance
The high chromium content of duplex stainless steels that protects against corrosion, causes embrittlement at temperatures over about 300°C.

At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades. Duplex grades can readily be used down to at least -50°C.

Copper Nickel tubes, CUNI
Application range: Copper-Nickel Alloy tube for condenser and heat-exchangers, Water Evaporators, Boiler Blowdown Heat Exchangers, air coolers, Gland Steam Condensers, Steam Ejector, Turbine Oil Coolers, Fuel Oil Heaters, Compressed Air Inter and After Coolers, Ferrules, Oil Well Pump Liner, and Distiller etc.

Copper Nickel tubes, CUNI 70/30 – C71500 – has, in general, the best resistance of any of the copper alloys to impingement attack and to corrosion from most acids and waters. It is being used in severe corrosive conditions in which service lives longer than those of other copper alloys are desired.

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