Blind flange

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Blind Flange Overview

Manufacturing Method	Forged, Plate and Cast
Standard	ASME B16.5 (Forged Blind Flange), ASME B16.47 (Large Diameter Blind Flange)
Sizes	NPS 1/2″ to NPS 24″ (150#, 300#, 400#, 600#, 900#, 1500#), NPS 1/2 – NPS 12″ (2500# BL Flange)
Pressure Rating Class	ASME B16.5 Class 150, 300, 400, 600, 900, 1500, 2500
Steel and Alloys	Carbon Steel, Nickel Alloy, Stainless Steel, Hastelloy, Titanium, Duplex and Super Duplex, Inconel, 16Mo3, Monel, Copper, Copper Nickel Blind Flanges

Table of Content

Blind Flange Specification
Manufacturing Standards of Plate and Forged Blind Flange Material
Weight Chart of B16.5 Flat Flange
Blind Flange Dimensions
ANSI B16.67 Class 300 BL Flange Pressure Rating
Material of Blind Flange
Manufacturing Methods of Flat Face Flange
Height of Raised Face Blind Flange
ANSI B16.5 Blind Flange Number of Bolts With Sizes
Manufacturing Standards of Blind Flange
ASME B16.5 Blind Flange Face Types
Blind Flange Isometric Symbol
Blind Flange Weight Chart and Dimensions For Other Classes
Flat Face Blind Flange Pressure Class
How to Test The MTC Report Before Accepting The Delivery Of The Blind Flange?
Types of Blind Flange
Alloy Steel Blind Flange Temperature Range
How Many Types of Blind Flanges Are There?
What is a Blind Flange?
Stainless Steel Blind Flange International Standards
EN 1092-1 Type 05 Blind Flange Weight in Kg
Hydrostatic Test Pressures of Stainless Steel BLFF Flange

Find Only Verified Suppliers of Stainless Steel Blind Flange and Carbon Steel BLRF Material in UAE

Blind Flange Specification

Connection Types: Raised face (RF) Blind Flange, flat face (FF) Blind Flange, ring joint (RTJ) Blind Flange

Applications: High pressure and temperature

German Standard: Blind flange DIN 2527

EN 1092-1 Blind Flange: Type A (FF), Type B (RF), Type C (Tongue), Type D (Groove) and Type E/F/G/H

Blind Flange Other Name: Blank Flange, BLRF, BLFF, BLRTJ

SOUR Service Certification: NACE MR 01-75 / ISO 15156

Country of Origin: Blind Flange make in UAE, India, Netherlands, Europe, USA, Japan and Korea

Stainless Steel Blind Flanges as per ASTM A182/ SA 182

Carbon Steel Blind Flanges as per ASTM A105, A350, A694, A181

Duplex Steel Blind Flanges in UNS S31803, UNS S32205, UNS S32750, UNS S32760

Buy Directly from Blind Flange suppliers in UAE

100% Tested ANSI B16.5 Blind Flange with MTC EN 10204/3.1, ISO 10474

Get Tested Alloy Steel Blank Flanges And Duplex Steel Blind Flat Flanges at the Best Price in Middle East Countries

Manufacturing Standards of Plate and Forged Blind Flange Material

Manufacturing standard
Forged method	Plate method
Stainless Steel Blind Flange/ BLRF
ASTM A182 F304 blind flange / SS 304	ASTM A240 304
ASTM A182 304L/ SS 304L	ASTM A240 304L
ASTM A182 310	ASTM A240 310
ASTM A182 F316 blind flange/ SS 316	ASTM A240 316
ASTM A182 316L/ SS 316L	ASTM A240 316L
ASTM A182 316LN	ASTM A240 316LN
ASTM A182 317	ASTM A240 317
ASTM A182 317	ASTM A240 317L
ASTM A182 F347	ASTM A240 347
ASTM A182 F321	ASTM A240 321
ASTM A182 F904L	ASTM A240 904L
ASTM A182 F6A	–
ASTM B462 UNS N08020	ASTM B463 N08020
Carbon Steel Blind Flange
Forged method	Plate method
ASTM A105 blind flange	ASTM A515 Grade 60
ASTM A105N	–
ASTM A350 Grade LF2	–
ASTM A350 Gr LF3
ASTM A350 Gr LF6	–
Low Temperature Carbon Steel (LTCS)
ASTM A694 F42 blind flange	ASTM A572 Gr 42
ASTM A694 F46	–
ASTM A694 F50	ASTM A572 Gr 50
ASTM A694 F52	–
ASTM A694 F60	ASTM A572 Grade 60
ASTM A694 F65	ASTM A572 Grade 65
ASTM A694 F70	ASTM A572 Grade 70
S235JRG2, P250GH, 1.4541, 1.4571	–
Alloy Steel Blind Flange
Forged method	Plate method
ASTM A182 Grade F5A & F5	ASTM A387 Grade 5
ASTM A182 F1	–
ASTM A182 F9	ASTM A387 Grade 9
ASME/ ASTM A182 F11 blind flange	ASTM A387 Grade 11
ASTM A182 F22	ASTM A387 Gr 22
ASTM A182 F91	ASTM A387 Gr 91
Duplex Steel Blind Flange
Forged method	Plate method
ASTM A182 F51 (Duplex 2205)	ASTM A240 UNS S31803
ASTM A182 F53 blind flange	ASTM A240 UNS S32750
ASTM A182 F55 (Duplex 2507)	ASTM A240 UNS S32760
Al 6XN	ASTM A240 UNS N08367
ASTM A182 F44	ASTM A240 UNS S31254
ASTM A182 F60	ASTM A240 UNS S32205
Nickel Alloy Blind Flange
Forged method	Plate method
SB 564 Inconel 800	ASTM B409 UNS N08800
SB 564 Inconel 825	ASTM B409 UNS N08825
SB 564 Inconel 600	ASTM B168 UNS N06600
SB 564 Inconel 601	ASTM B168 UNS N06601
Inconel 625 blind flange – ASTM B564/ SB 564	ASTM B168 UNS N06625
Monel 400 blind flange – ASTM B564/ SB 564	ASTM B127 UNS N04400
Monel K500 – ASTM B564/ SB 564	ASTM B127 UNS N05500
Hastelloy C-22 – ASTM B564/ SB 564	ASTM B575 UNS N06022
Hastelloy C 276 blind flange – ASTM B564/ SB 564	ASTM B575 UNS N10276
Titanium Blind Flange
Forged method	Plate method
ASTM B381 Grade F2	ASTM B265 UNS R50400
ASTM B381 Grade F3	ASTM B265 UNS R50550
Copper Blind Flange
Forged method	Plate method
ASTM B283 UNS C37700	ASTM B152 UNS C10100
ASTM B124 UNS C63000	–
Copper Nickel Blind Flange
Forged method	Plate method
Cuni 90/10 : ASTM B151 UNS C70600	ASTM B122 CU-Ni 90/10
Cuni 70/30 : ASTM B151 UNS C71500	ASTM B122 CU-Ni 70/30
EEMUA 234 : UNS 7060X	–
EEMUA 145	–
EN 1652/ 12420/124491	–
Ductile Iron Blind Flange
Forged method	Plate method
ASTM B381 GR.F2/ 1018 Cast Iron	–

Check Out Your Nearby Locations For Fastest Deliveries

Country	Cities
Netherlands	The Hague
Belgium	Meeuwen-Gruitrode
Netherlands	Amsterdam
Belgium	Antwerp
Netherlands	Haarlem
Belgium	Brussels
Belgium	Seraing
Belgium	Ghent
Belgium	Leuven
Netherlands	Eindhoven
Belgium	Westerlo
Netherlands	Rotterdam

Why Pay More if You Can Get Carbon Steel Blank Flange At The Best Price in Dubai and Buy Only After Checking The Weight Chart And Price List

Weight Chart of B16.5 Flat Flange

NPS	Class 300 Blind Flange	Class 600 Blind Flange	Class 150 Blind Flange
24	360	562.5	193.5
22	288	450	159.8
20	231.8	384.8	128.3
18	186.3	299.3	99
16	141.8	237.2	81
14	112.5	170.1	63
12	83.3	132.8	55.4
10	55.8	103	31.5
8	36.5	63	21.2
6	22.5	38.7	12.2
5	16.7	30.6	9
4	12.6	18.5	7.7
3½	9.5	13	5.9
3	7.2	9	4.1
2½	5.4	6.8	3.2
2	3.6	4.5	2.3
1½	3.2	3.6	1.8
1¼	2.7	2.7	1.4
1	1.8	1.8	0.9
1/2	0.9	1.4	0.9

Warehouse Locations of Partner Suppliers

Middle East countries	Qatar, Lebanon, Bahrain, Saudi, Kuwait, UAE, Jordan, Iraq, Syria, Iran, Yemen
Africa	Nigeria, South Africa, Kenya, Morocco, Egypt, Tunisia, Algeria
MENA	Morocco, Libya, Algeria, Tunisia, Egypt, Israel, Palestine

Refer ANSI/ASME b16.5 Blind Flange Dimensions and ASTM A182 F304 Blind Flange Pressure Rating and Super Duplex Flat Face Blind Flange Sizes

Blind Flange Dimensions

	NPS 1/2 blind flange
Class	150#	300#	600#	900#	1500#	2500#
D	90	95	95	120	120	135
B	11.2	14.3	20.7	28.7	28.7	36.6
G	35.1	35.1	35.1	35.1	35.1	35.1
K	60.3	66.7	66.7	82.6	82.6	88.9
Number of L	4	4	4	4	4	4
Diameter Of L	15.9	15.9	15.9	22.2	22.2	22.2
	NPS 3/4 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	100	115	115	130	130	140
B	12.8	15.9	22.3	31.8	31.8	38.2
G	42.9	42.9	42.9	42.9	42.9	42.9
K	69.9	82.6	82.6	88.9	88.9	95
Number of L	4	4	4	4	4	4
Diameter Of L	15.9	19.1	19.1	22.2	22.2	22.2
	NPS 1 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	110	125	125	150	150	160
B	14.3	17.5	23.9	35	35	41.4
DIA G	50.8	50.8	50.8	50.8	50.8	50.8
DIA K	79.4	88.9	88.9	101.6	101.6	107.4
Number of L	4	4	4	4	4	4
Diameter Of L	15.9	19.1	19.1	25.4	25.4	25.4
	NPS 1.1/4 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	115	135	135	160	160	185
B	15.9	19.1	27.1	35	35	44.5
DIA G	63.5	63.5	63.5	63.5	63.5	63.5
DIA K	88.9	98.4	98.4	111.1	111.1	130
Number of L	4	4	4	4	4	4
Diameter Of L	15.9	19.1	19.1	25.4	25.4	28.6
	NPS 1.1/2 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	125	155	155	180	180	205
B	17.5	20.7	28.7	38.2	38.2	50.9
DIA G	73	73	73	73	73	73
DIA K	98.4	114.3	114.3	123.8	123.8	146
Number of L	4	4	4	4	4	4
Diameter Of L	15.9	22.2	22.2	28.6	28.6	31.8
	NPS 2 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	150	165	165	215	215	235
B	19.1	22.3	31.8	44.5	44.5	57.3
DIA G	91.9	91.9	91.9	91.9	91.9	91.9
DIA K	120.7	127	127	165.1	165.1	171.4
Number of L	4	8	8	8	8	8
Diameter Of L	19.1	19.1	19.1	25.4	25.4	28.6
	NPS 2.1/2 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	180	190	190	245	245	265
B	22.3	25.5	35	47.7	47.7	63.6
DIA G	104.6	104.6	104.6	104.6	104.6	104.6
DIA K	139.7	149.2	149.2	190.5	190.5	197
Number of L	4	8	8	8	8	8
Diameter Of L	19.1	22.2	22.2	28.6	28.6	31.8
	NPS 3 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	190	210	210	240	265	305
B	23.9	28.6	38.2	44.5	54.1	73.1
DIA G	127	127	127	127	127	127
DIA K	152.4	168.3	168.3	190.5	205	230
Number of L	4	8	8	8	8	8
Diameter Of L	19.1	22.2	22.2	25.4	31.8	34.9
	NPS 3.1/2 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	215	230	230	–	–	–
B	23.9	30.2	41.4	–	–	–
DIA G	139.7	139.7	139.7	–	–	–
DIA K	177.8	184.2	184.2	–	–	–
Number of L	8	8	8	–	–	–
Diameter Of L	19.1	22.2	25.4	–	–	–
	NPS 4 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	230	255	275	290	310	355
B	23.9	31.8	44.5	50.9	60.4	82.6
DIA G	157.2	157.2	157.2	157.2	157.2	157.2
DIA K	190.5	200	215.9	235	240	273
Number of L	8	8	8	8	8	8
Diameter Of L	19.1	22.2	25.4	31.8	34.9	41.3
	NPS 6 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	280	320	355	380	395	485
B	25.5	36.6	54.3	62	89	114.4
DIA G	215.9	215.9	215.9	215.9	215.9	215.9
DIA K	241.3	269.9	292.1	317.5	320	368
Number of L	8	12	12	12	12	8
Diameter Of L	22.2	22.2	28.6	31.8	38.1	54
	NPS 8 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	345	380	420	470	485	550
B	28.6	41.3	62	69.9	98.5	133.4
DIA G	269.9	269.7	269.7	269.7	269.7	269.7
DIA K	298.5	330.2	349.2	393.7	395	438.1
Number of L	8	12	12	12	12	12
Diameter Of L	22.2	25.4	31.8	38.1	44.5	54
	NPS 10 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	405	445	510	545	585	675
B	30.2	47.7	69.9	76.3	114.4	171.5
DIA G	323.9	323.9	323.9	323.9	323.9	323.9
DIA K	362	387.4	431.8	469.9	485	539.7
Number of L	12	16	16	16	12	12
Diameter Of L	25.4	28.6	34.9	38.1	50.8	66.7
	NPS 12 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	485	520	560	610	675	760
B	31.8	50.9	73.1	85.8	130.3	190.6
DIA G	381	381	381	381	381	381
DIA K	431.8	450.8	489	533.4	571.5	619.1
Number of L	12	16	20	20	16	12
Diameter Of L	25.4	31.8	34.9	38.1	54	73
	NPS 14 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	535	585	605	640	750	–
B	35	54	76.3	92.2	139.8	–
DIA G	412.8	412.8	412.8	412.8	412.8	–
DIA K	476.3	514.4	527	558.8	635	–
Number of L	12	20	20	20	16	–
Diameter Of L	28.6	31.8	38.1	41.3	60.3	–
	NPS 16 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	595	650	685	705	825	–
B	36.6	57.2	82.6	95.3	152.5	–
DIA G	469.9	469.9	469.9	469.9	469.9	–
DIA K	539.8	571.5	603.2	616	705	–
Number of L	16	20	20	20	16	–
Diameter Of L	28.6	34.9	41.3	44.5	66.7	–
	NPS 18 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	635	710	745	785	915	–
B	39.7	60.4	89	108	168.4	–
DIA G	533.4	533.4	533.4	533.4	533.4	–
DIA K	577.9	628.6	654	685.8	775	–
Number of L	16	24	20	20	16	–
Diameter Of L	31.8	34.9	44.5	50.8	73	–
	NPS 20 blind flange
Class	150#	300#	600#	900#	1500#	2500#
Diameter Of D	700	775	815	855	985	–
B	42.9	63.6	95.3	114.4	184.2	–
DIA G	584.2	584.2	584.2	584.2	584.2	–
DIA K	635	685.8	723.9	749.3	831.8	–
Number of L	20	24	24	20	16	–
Diameter Of L	31.8	34.9	44.5	54	79.4	–

ANSI B16.67 Class 300 BL Flange Pressure Rating

Temperature (°F)	Class 300 Flange
950	345
800	510
750	530
900	450
850	485
300	730
200	750
100	750
700	570
500	665
400	705
650	590
600	605

Always Check NDT Test Report Before Buying Raised Face Blind Flange in High Temp Alloys Like Inconel, Hastelloy and Monel

Material of Blind Flange

Duplex Steel BL Flange	Duplex 2205, UNS S31803 (DIN 1.4462), UNS S32205, Super Duplex 2507, UNS S32750 (DIN 1.4410), UNS S32760, ASTM A182 Grade F51, F52, F53, F54, F55, F57, F59, F60, F61, SMO 254, AL6xn, 6Mo, UNS S31254, DIN 1.4547
Nickel Alloy BLRF Flange	ASTM B564 / ASME SB 564M, Nickel 200, Alloy 201, Nickel 205LC, Nickel 205
Inconel Blind Flange	ASME SB 564 UNS N06600 (Alloy 600) W.Nr. 2.4816, UNS N06601 (Alloy 601) W.Nr. 2.4851, UNS N06617 (Alloy 617) W.Nr. 2.4663a, ASTM B564 UNS N06625 (Alloy 625) W.Nr. 2.4856, UNS N06626 (Alloy 625LCF) W.Nr. 2.4856, UNS N06686 (Alloy 686) W.Nr. 2.4606, UNS N06690 (Alloy 690) W.Nr. 2.4642, UNS N06693 (Alloy 693), UNS N09706 (Alloy 706), UNS N07718 (Alloy 718) W.Nr. 2.4668, UNS N07719 (Alloy 718SPF), UNS N07725 (Alloy 725), UNS N07740 (Alloy 740H), UNS N07750 (Alloy X-750) W.Nr. 2.4669, UNS N07751 (Alloy 751), UNS N07754 (Alloy MA754), UNS R30783 (Alloy 783)
Incoloy Blank Flange	ASTM B564 UNS N08825, UNS N09925
Incoloy Alloy 20 Blind Flange	ASTM B462 UNS N08020
Hastelloy Flat Flange	ASTM B564 UNS N10276 (Hastelloy C276), UNS N06022 (Hastelloy C22), UNS N06200 (C2000), UNS N06002 (X), UNS N10001 (B), UNS N10665 (B2), UNS N10675 (B3), UNS N06035 (G35), UNS N06985 (G3), UNS N06030 (G30), UNS N06455 (C4), UNS N07022 (C-22HS), UNS N10003 (N), UNS N06635 (S)
Monel Face Flange	ASTM B564 UNS N04400, UNS N05500
SS 904L Blind Flange	UNS N08904
Stainless Steel BL Flange	ASTM A182 Gr 304, 304L, 316, 316L, 310, 310S, 317L, 316Ti, 321, 347, 347H, UNS S66286
Carbon Steel Flat Flange	ASTM A105, A105N, A350 LF2 (LTCS), LF3, AISI 4130, AISI 4140, AISI 4340, AISI 4145
Carbon Steel ASTM A694 Face Flange	A694 F42, F46, F52, F60, F65, F706
Alloy Steel BL Flange	ASTM A182 F5, F9, F11, F22, F91
Cupro Nickel BLFF Flange	Copper Nickel 90/10 and Cuni 70/30
Titanium Blind Flange	Titanium Gr 2, Gr 5

Blind Flange Material

Manufacturing Methods of Flat Face Flange

Forged blind flange
CNC machined BLRF flange
Blind plate flange (manufactured from plate)

Height of Raised Face Blind Flange

Class Of RF Blind Flange	Height
Class 150	1/6″
Class 300	1/6″
Class 400	1/4″
Class 600	1/4″
Class 900	1/4″
Class 1500	1/4″
Class 2500	1/4″

ANSI B16.5 Blind Flange Number of Bolts With Sizes

Number of Bolts
Size in Inch	Size in MM	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
1/2	15	4	4	4	4	4	4	4
3/4	20	4	4	4	4	4	4	4
1	25	4	4	4	4	4	4	4
1 1/4	32	4	4	4	4	4	4	4
1 1/2	40	4	4	4	4	4	4	4
2	50	4	8	8	8	8	8	8
2 1/2	65	4	8	8	8	8	8	8
3	80	4	8	8	8	8	8	8
3 1/2	90	8	8	8	8	–	–	8
4	100	8	8	8	8	8	8	8
5	125	8	8	8	8	8	8	8
6	150	8	12	12	12	12	12	8
8	200	8	12	12	12	12	12	12
10	250	12	16	16	16	16	12	12
12	300	12	16	16	20	20	16	12
14	350	12	20	20	20	20	16	–
16	400	16	20	20	20	20	16	–
18	450	16	24	24	20	20	16	–
20	500	20	24	24	24	20	16	–
24	600	20	24	24	24	20	16	–

Manufacturing Standards of Blind Flange

British (BS)	Germany (DIN)	Italy (UNI)	Japan(JIS)
EN 1092-1	DIN 2527 PN16	UNI 6091 67	JIS B2220
EN 1092-2	DIN 2527 PN6	UNI 6092 67	KS1503
BS1560	DIN 2527 PN10	UNI 6094 67	JIS B2311
BS3293	DIN 2527	UNI 6095 67	JIS B2312
AS 2129	DIN 2527 PN25	UNI 6093 67	JIS B2313
–	DIN 2527 PN40	UNI 6097 67	KS B1522
–	DIN 2527 PN64	UNI 6096 67	KS B1541
–	DIN 2527 PN100	–	KS B1543

ASME B16.5 Blind Flange Face Types

Type	Sealing way of blind pipe flange
BLRF	Raised face
FF	Flat face
RtJ	Ring type Joint
T&G	Tongue and Groove
M&F	Male & female

Blind Flange Isometric Symbol

Isometric Symbol	Image	Flange
		Blind Flange

Blind Flange Weight Chart and Dimensions For Other Classes

Flat Face Blind Flange Pressure Class

ASME B16.5 blind flange	150# 250# 300# 350# 400# 600# 900# 1500# 2500#
KS1503/ JIS B2220 blind flange	5K 10K 16K 20K 30K
EN1092-1 blind flange	PN6 PN10 PN16 PN25 PN40 PN63 PN100
SANS/SABS 1123 blind flange	Class 600/3 1000/3 1600/3 2500/3 4000/3

How to Test The MTC Report Before Accepting The Delivery Of The Blind Flange?

PMI test
Impact test
NACE MR0175
Tensile test
Hardness test
Hydrostatic pressure test
Dimensional inspection
Visual inspection

Types of Blind Flange

Spider Blind Flange

Flat Face Blind Flange

Stainless Steel Blank Flange

Blind Tapped Flange

Paddle Blind Flange

Spade Blind Flange

Alloy Steel Blind Flange Temperature Range

Alloy	Grade	UNS	Forged blind flange	DIN	WNR	Temperature range
Moly Steel blind flange	C-1/2Mo	K12822	A182 Gr F1 cl2	15M03	1.5415	Up to 470ºC* 875ºF
Alloy Steel Chrome Moly blind flange	1.1/4Cr-1/2Mo	K11572	A182 Gr F11 cl2	13CRM044	1.7335	Up to 593ºC 1100ºF
	2.1/4Cr-1Mo	K21590	A182 Gr F22 cl3	10CRM0910	1.7380	Up to 593ºC 1100ºF
	5Cr-1/2Mo	K41545	A182 Gr F5/F5a	12CRMO195	1.7362	High temp boiler/ refinery application
	9Cr-1Mo	K90941	A182 Gr F9	X 12 CrMo 9 1	1.7386	High temp erosive refinery application
	9Cr-1Mo-V		A182 Gr F91	X 10 CrMoVNb 9 1	1.4903	High pressure boilers
Alloy steel blind flange	AISI 4130 blind flanges	G41300	–	–	1.7218	899 to 927°C 1650 to 1700°F

How Many Types of Blind Flanges Are There?

Mainly there are two types of blind flanges:

Flat Face Blind Flange (FF)
Raised Face Blind Flange (RF)

What is a Blind Flange?

A blind flange is a solid plate used to seal or close off the end of a pipe or pressure vessel connection

Stainless Steel Blind Flange International Standards

USA	Europe	Germany	Japan
MSS SP44 ASME B16.5 blind flange API 605 AWWA AWWA C207 ANSI B16.5 CL 125 (Light weight) ANSI B16.47 (API 605) ANSI B16.36 ANSI B16.48 ASA	PN 10 to PN400 BS EN 1759 ISO 7005	DIN	JIS JIS B2220
Australia & UK	Europe	Russia	Italy
BS 10	BS EN 1092-1 blind flange BS EN 1092-2 RF blind flange BS EN 1092-3 blind pipe flange	Ghost	UNI 2276 UNI 6091
South Korean and China	Malaysia	France	Canada
KS B1503 (South Korean) GB/T 9112 / 9119 (China)	MS 253 MS 816 MS 253 MS 816	NF E 29-200 NF E 29-203	CSA B16.5 ANSI B16.47 Series A & B

EN 1092-1 Type 05 Blind Flange Weight in Kg

DN	PN 2.5	PN6	PN 10	PN 16	PN25
10	0.38	0.722	0.722	0,722	0,722
15	0.438	0.813	0.813	0,813	0,813
20	0.657	1.14	1.14	1,14	1,14
25	0.821	1.38	1.38	1,38	1,38
32	1.18	2.03	2.03	2,03	2,03
40	1.39	2.35	2.35	2,35	2,35
50	1.62	2.88	2.88	2,88	3,20
65	2.14	3.15	3.51	3,51	4,29
80	3.43	4.61	4.61	4,61	5,54
100	4.22	5.65	5.65	5,65	7,60
125	6.10	8.13	8.13	8,13	–
150	7.51	10.5	10.5	10,5	–
200	12.3	–	16.2	–	–

Hydrostatic Test Pressures of Stainless Steel BLFF Flange

ASTM Specification	Test Pressure (psig)
ASTM Specification	150#	300#	400#	600#	900#	1500#	2500#
A479-304 A182-F304 A479-304H A351-CF3 A182-F304H A240-304 A351-CF8 A240-304H A312-TP304 A312-TP304H	425	1100	1450	2175	3250	5400	9000

What Can Cause Blank Flange To Rust?

Salt Contact
Moisture Exposure
Environmental Humidity
Improper Storage Conditions
Poor Coating or Surface Finishes

Temperature Wise Pressure Ratings of ASTM A105 BLRF Flange

Temperature (°C)	Working Pressure (bar)
Temperature (°C)	2500#	1500#	900#	600#	400#	300#	150#
538	49.2	29.5	17.7	11.8	7.9	5.9	1.4
500	97.9	58.8	35.3	23.5	15.7	11.8	2.8
475	145.3	87.2	52.3	34.9	23.2	17.4	3.7
450	191.7	115.0	69.0	46.0	30.7	23.0	4.6
425	239.7	143.8	86.3	57.5	38.4	28.8	5.5
400	289.3	173.6	104.2	69.4	46.3	34.7	6.5
375	303.1	181.8	109.1	72.7	48.5	36.4	7.4
350	313.0	187.8	112.7	75.1	50.1	37.6	8.4
300	331.8	199.1	119.5	79.6	53.1	39.8	10.2
325	322.6	193.6	116.1	77.4	51.6	38.7	9.3
250	349.5	209.7	125.8	83.9	55.9	41.9	12.1
200	365.0	219.0	131.4	87.6	58.4	43.8	13.8
150	375.6	225.4	135.2	90.2	60.1	45.1	15.8
100	388.3	233.0	139.8	93.2	62.1	46.6	17.7
50	417.7	250.6	150.4	100.2	66.8	50.1	19.2
-29 – 38	425.5	255.3	153.2	102.1	68.1	51.1	19.6

Storage Sites of Partner Suppliers

City	Region	Country
Dubai	Middle East	United Arab Emirates
Abu Dhabi	Middle East	United Arab Emirates
Dammam	Middle East	Saudi Arabia
Riyadh	Middle East	Saudi Arabia
Doha	Middle East	Qatar
Abuja	Africa	Nigeria
Kuwait City	Middle East	Kuwait
Jeddah	Middle East	Saudi Arabia
Cairo	MENA	Egypt
Casablanca	MENA	Morocco
Johannesburg	Africa	South Africa
Cape Town	Africa	South Africa
Lagos	Africa	Nigeria