What is a PN 16 flange?

‘PN’ stands for Pressure Nominale and prefixes the pressure rating, e.g. a PN16 flange is designed to operate up to 16 bar. The American ANSI standard refers instead to a pressure / temperature rating termed ‘Class’.

What size is a PN16 flange?

95mm
1/2″ NB (DN15) Flange Table – Flange Dimensions

1/2″	Flange Diameter	Diameter of Bolts
PN10	95mm	M12
PN16	95mm	M12
PN25	95mm	M12
PN40	95mm	M12

What is class 125 flange?

1 Class 125 flange is rated for 125 psi at 353ºF (178ºC), which is the boiling temperature for water at that pressure. As temperature increases, the pressure rating of the flange decreases.

What size are flange bolts?

Flange bolts are partially and fully threaded depending on size and length. The point for hex types is chamfered or rounded; for 12 point, it’s flat and chamfered. Typical sizes for hex range from 3/8″ to 3/4″; #10 to 1/2″ for serrated hex; and 1/4″ to 1″ in diameter for 12 point.

What size is PN16 in inches?

PN16 Flanges BS4504

Nominal	BS4504 PN16
DN size	NB size	DIA mm
15	1/2″	95
20	3/4″	105
25	1″	115

Are PN10 and PN16 flanges the same?

Note: PN10/16 – Some flanges are denoted PN10/16. These refer to the fact that either PN10 or PN16 flanges will fit, as the drillings for many sizes are the same.

What is class 150 flange?

Flanges can withstand different pressures at different temperatures. For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F.

What is a Class 250 valve?

Class 125 and Class 250 are cast iron flanges and flanged fittings while Class 150 and Class 300 are ductile iron, steel or stainless steel. Hence, ANSI/ASME B16. 1 Class 125 flanges are made from cast iron, ANSI/ASME B16. 5 Class 150 can be made from steel or stainless and ANSI/ASME B16.

What size bolts for a 16 flange?

Flange Bolting Chart

	150 LB. Flanges
Nominal Pipe Size	# Bolts or Studs	Dia of Bolts or Studs
16	16	1.50
18	16	1.63
20	20	1.63

How do I choose bolts for flange?

The most common materials for stud bolts (for flanges) are ASTM A193 (grade B7, B8, B8M, B8T), ASTM A453 (grade 660), ASTM A320 (grade L7, L7M), and ASTM A182 (duplex and super duplex bolting)….ASTM A193 Stud Bolts: Mechanical Properties.

	TEMPERATURE °C ( °F )
A453 Gr. 660	-29 (20)	538 (1000)

What does PN25 mean?

PN10, PN16, PN25 and PN40 specify both pressure class in bars of pressure, and metric flange dimensions (such as bolt circle diameter, hole size, bolt size etc) according to international flange standards such as ISO 7005-1 or DIN 2501 that use the metric system of measurements.

What is PN10 16 flange?