DIN 2527 A182 1.4307 BL Flange DN25 PN16

Type: DIN 2527 BL Flange
Material: F304L (UNS S30403/1.4307)
Size: 1″ (DN25)
Pressure: PN16
Standard: DIN 2527

Chemical Composition and Mechanical Property for 304/304L
Steel Grade	Chemical Composition									Mechanical Performance
	C(Max)	Si(Max)	Mn(Max)	P(Max)	S(Max)	Ni	Cr	N	Mo	Tensile Strength (Min)	Yield Strength (Min)
										Mpa	Mpa
304	0.08	0.75	2.00	0.045	0.03	8.0–10.5	18.0–20.0	0.1	/	515	205
304L	0.03	0.75	2.00	0.045	0.03	8.0–12.0	18.0–20.0	0.1	/	485	170

BLIND FLANGE DIN 2527 PN16

Norminal Pipe Size	Flange Dimension			Screw Parameter			Approx. Flange Weight (7,85 kg/dm3)
	D (Flanges Dia)	b (Thk of Flange)	k (Dia of Bolt Circle)	No. of holes	Thread	d2 (Dia of Bolt Holes)	Shape B (Kgs)
15	95	14	65	4	M12	14	0,72
20	105	16	75				1,01
25	115	16	85				1,23
32	140	16	100		M16	18	1,80
40	150	16	110				2,09
50	165	16	125				2,88
65	185	18	145				3,66
80	200	20	160	8			4,77
100	220	20	180				5,65
125	250	22	210				8,42
150	285	22	240		M20	22	10,4
200	340	24	295	12			16,1
250	405	26	355		M24	26	24,9
300	460	28	410				35,1
350	520	30	470	16			47,8
400	580	32	525		M27	30	63,5
500	715	36	650	20	M30	33	102

Note:
1. Facing according to DIN 2526 
Flat face: 
Form A, Face without any requirements
Form B, Face Rz=160, machined (not smoother than 40µm)
Raised Face: 
Form C, Face Rz=160, machined (not smoother than 40µm)
Form D, Face Rz=40, machined
Form E, Face Rz=16, machined
2. Tongue and groove according to DIN 2512
Form F, Tongue
Form N, Groove 
3. Male and Female according to DIN 2513, DIN 2514
Form V13, V14, Male
Form R13, R16, Female
4. Chemfering for diaphragm-weld packings, PN64-PN400, according to DIN 2695
5. Facing for lens-shaped joints, PN64-PN400, according to DIN 2696

What is a Blind Flange?

A blind flange is a solid disk used to block off a pipeline or to create a stop.
Similar to a regular flange, a blind flange has mounting holes around the perimeter and the gasket sealing rings are machined into the mating surface. The difference is that a blind flange has no opening for fluids to pass through. Instead, it is placed in between two open flanges, which stops the flow through a pipe. Many times this type of blockade is used when adding another line onto an existing pipeline or when a new valve is being added.
Often a blind flange is inserted into a pipeline when a repair is required further up the line. This allows the flanges down stream to be disconnected without fear of losing liquid. Many times this type of blockade is used when adding another line onto an existing pipeline or when a new valve is being added. This blockade is also used to shut down a line when it is no longer needed.
Without the blind flange it would be difficult to perform maintenance or repairs on a pipeline. The flow would need to be shut off at the nearest valve, which could be miles away from the repair area. Valves are also very expensive and are prone to sticking. The blind flange is a much more cost efficient way of sealing a pipe.
When a pipeline is being constructed, a blind flange is often incorporated into the final length of pipe. This design allows for expansion or continuation of the pipeline by simply adding onto the final flange. This holds true for the addition of tees in the pipeline as well. A tee can be installed and then blocked in order to leave the option of running a pipe at a later date.
The use of flanged pipe has allowed pipelines to be built in a much faster manner than traditional welded seam pipelines. Moreover, it has made the task of repair and sectional replacement a simpler job. Sections of pipe can now be assembled anywhere in the world and shipped to the job site. Once there, they can simply be bolted into place and the pipeline can resume transportation of its liquid cargo.

Where are Blind Flanges Most Commonly Used?

Blind flanges are commonly used in petrochemical, pipe engineering, public services and water works.
A blind flange is useful for making repairs to a pipeline further up the line. In fact, during construction of a pipeline, a blind flange may be built into the final length of pipe. This allows for expansion or continuation of the pipeline simply by adding onto the final flange.

DIN 2576 Flange Material