Power plant power pipeline chart
 
The steel pipe for electric power is open at both ends and has a hollow section. According to the production method, it can be divided into a seamless steel pipe and a welded steel pipe. The specifications of the steel pipe are expressed by the outer dimensions (such as the outer diameter or the side length) and the wall thickness, and the size thereof is wide. From small diameter capillaries to large diameter pipes up to several meters in diameter.
 
 
Power plant power pipeline grade chart

Pipeline grade chart
Scope of application			Power plant power pipeline (except main steam, main feed water, industrial extraction steam, circulating water, gas pipeline, other low pressure steam and water pipelines)		Grade code:
Nominal pressure PN (MPa)			1.6	Operating medium
Design conditions		Design pressure (MPa)	1.0	Basic material	Carbon steel
		Design temperature (°C)	≤200	Corrosion margin (mm)	1.5
Item		Nominal diameter DN (mm)	Specification		Material	Standard
Pipe		15	Seamless steel pipe Φ18×2		20	GB3087-2008
		20	Seamless steel pipe Φ25×3
		25	Seamless steel pipe Φ32×3
		32	Seamless steel pipe Φ38×3
		40	Seamless steel pipe Φ45×3
		50	Seamless steel pipe Φ57×3.5
		65	Seamless steel pipe Φ76×3.5
		80	Seamless steel pipe Φ89×4
		100	Seamless steel pipe Φ108×4
		125	Seamless steel pipe Φ133×4
		150	Seamless steel pipe Φ159×4.5
		200	Seamless steel pipe Φ219×6
		250	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ273×6		Q235-B	SY/T5037-2000
		300	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ325×7
		350	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ377×7
		400	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ426×7
		450	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ480×7
		500	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ529×8
		600	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ630×9
		700	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ720×11
		800	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ820×12
		900	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ920×13
		1000	Spiral submerged arc welded steel pipe for low pressure fluid transportation Φ1020×14
Pipe fittings	elbow		Seamless hot-bending elbow (with straight or no straight section) outer diameter and wall thickness are the same as the pipe type specification, such as: seamless hot-bending elbow (with straight section) Φ159×4.5		20	2000GD
	Tee		When the design pressure is ≥ 2.0 MPa, the temperature is ≥ 250 ° C, and the ratio of the branch pipe to the nominal diameter of the main pipe is greater than or equal to 0.8, a three-way connection is used. The remaining pipes are welded to the main pipe.
	concentric reducer		Steel plate welded reducer (concentric or eccentric) The outer diameter and wall thickness are the same as the pipe type specification, such as: steel plate welded reducer Φ159×4.5/Φ108×4		20	2000GD
Valve	Gate valve	15~40	Z11H-16C		Carbon steel
		15~400	Z41H-16C		Carbon steel
	Shut-off valve	15~40	J11H-16C		Carbon steel
		15~200	J41H-16C		Carbon steel
	Butterfly valve	40~600	D343H-16C		Carbon steel
	Ball valve	15~50	Q11H-16C		Carbon steel
	Check valve	15~40	H41H-16C (Horizontal lift）		Carbon steel
			H42H-16C（Vertical lift）		Carbon steel
		50~600	H44H-16C（Swing）		Carbon steel
Flange			Flange flat welding flange F1.6C12RS Model specification, such as: flat surface welding flange PN1.6MPa DN150 (Series II)		20	2000GD
Double headed stud					35	GB/T 9125-2003
Large hex nut					35	GB/T 9125-2003
Light washer					Q235-B	GB/T 95-2002
Gasket			Flexible graphite metal wound gasket (with inner ring and positioning ring type) Model specification, such as: PN1.6MPa DN150 D 1222 type		0Cr18Ni9/Flexible graphite	GB/T 4622.2-2003