GOST Flange and GOST 12821/ 33259/ 12815/ 12820 Flange dimensions

Refer GOST 12821/ 33259/ 12815/ 12820 Flange dimensions and weight chart

Table Of Content:

GOST Flange Specification
Gost 12821-80 PN16 Slip On Flange Price List
Types Of Russian Flange Standards
GOST 12821-80 Flanges Dimensions
GOST 12821-80 Flange PN0.6MPa Dimensions Dimensions
GOST 12821-80 Flange PN1.0MPa Dimensions
GOST 12821-80 Flange PN1.6MPa Dimensions
GOST 12821-80 Flange PN2.5MPa Dimensions
GOST 12821 PN6 Carbon Steel Welding Neck Flange Dimensions
GOST 12820 PN16 Flat Flange Dimensions
GOST 12836 PN16 Blind Flange Dimensions

Gost 33259 Flange Dimensions
GOST 12821-80 PN16 Slip On Flange Wall Thickness
Russian GOST Flange Weight
GOST Standard Flanges Sizes
GOST Pipe Flange Pressure Rating
GOST 33259 Plate Flange Bolt Chart
Face Types Of GOST 12821 Flange
GOST 12820 Flange Tolerance
Gaskets For GOST 12815 RTJ Flanges
GOST 12815-80 Flange Surface Finish Chart
GOST Raised Face Flange Applications
GOST 12820-80 Flange Forging Process

GOST Flange Specification

Specification	GOST Flange
Schedule	SCH 5S, SCH 10, SCH 40, SCH 80, SCH 120, SCH 160, SCH 180 To XXS
Flange Test	Hydrostatic testing machine/ UI trasonic flaw detector/ X-ray detector/ Direct-reading Spectrograph/ Magnetic particle detector
Flange Equipment	Pushing Machine/ electric bevelling machine/ Press machine/ Bending machine/ Sand-blasting machine etc
Coating	Anti-rust Paint/ Zinc Plated/ Oil Black Paint/ Yellow Transparent/ Cold and Hot Dip Galvanized
Manufacturer Length	NPS 1⁄₂" To NPS 48”
Face Type	RTJ/ FF/ RF/ lap joint/ Male & Female / Tongue & Groove.
Forging Methods	Casting/ Forging/ Rolling/ Cutting
Supporting Material	Gasket/ Ring Joint/ Flange Bolts
Test Certificates	EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc
Production Technique	Forged/ Heat treated and machined
Manufacturer of	Forged/ Threaded/ Screwed / Plate
Manufacturer Pressure Class	Class 150 (lb) up to 24" Class 300 (lb) up to 20" Class 600 (lb) up to 20" Class 900 (lb) up to 16" Class 1500 (lb) up to 10" Class 2500 (lb) up to 8"
Application	Bitumen upgraders Heavy oil refineries. Nuclear power (mostly seamless). Petrochemicals and acids.

Gost 12821-80 PN16 Slip On Flange Price List

Type Of Flange	Size In Inch	SCH	Class	Standard	Price In INR (India) Per Piece
Slip On Flange	1 1/2	40	150	GOST 12821	234.00
-	2	40	150	-	350.00
-	3 2/3	40	150	-	547.00
-	4	40	150	-	876.00
Slip On Flange	6 3/4	80	300	GOST 12821	1290.00

Manufacturer of GOST Standard Flanges in Stainless, Alloy and Carbon Steel material, check price and list of grades

Types Of Russian Flange Standards

GOST Pipe Flange

GOST Forged Flange

Russian Flange Standards

GOST 12821 Blind Flanges

GOST 12821 Slip On Flanges

GOST 12821 Weld Neck Flanges

GOST 33259 Threaded Flanges

GOST 12821 Puddle Flange

GOST 12820 RTJ Flanges

GOST 12815 Orifice Flanges

GOST 12815-80 Spectacle Blind Flanges

GOST 12820-80 Plate Flanges

GOST 12821 Reducing Flange

GOST Vanstone Flange

GOST 12820 Raised Face Flanges

Russian Flange

GOST Standard Flange

GOST 12821-80 Weld Neck Flange

GOST 12821 Welding Neck Flange

GOST 12836 Blind Flange

Gost 12821-80 PN16 Slip On Flange

Check Gost 33259 flange dimensions of Class 150/ 300/ 600, buy large diameter GOST Standard Flange at factory price in India

GOST 12821-80 Flanges Dimensions

Проход условный Dy	(d)1	(b)	(h)4	(Dm)	(Dn)	Масса, кг
Проход условный Dy	(d)1	(b)	(h)4	(Dm)	(Dn)	соединительным выступом (C)	выступом (C)	впадиной (C)	шипом (C)	пазом (C)
10	8	10	27	22	15	0,34	0,34	0,32	0,34	0,33
15	12		28	28	19	0,40	0,40	0,38	0,40	0,40
20	18		30	36	26	0,53	0,53	0,50	0,53	0,52
25	25	12	30	42	33	0,76	0,77	0,72	0,75	0,75
32	31		33	50	39	1,10	1,08	1,04	1,08	1,08
40	38		35	60	46	1,36	1,37	1,28	1,30	1,34
50	49			70	58	1,53	1,51	1,44	1,46	1,47
65	66			88	77	1,97	2,06	1,83	1,72	1,75
80	78	13	37	102	90	2,76	2,76	2,80	2,65	2,72
100	96	13	38	122	110	3,35	3,04	3,03	3,03	3,04
125	121	15	40	148	135	4,66	4,24	3,66	4,50	4,55
150	146	15	43	172	161	5,37	5,85	4,93	5,29	5,35
(175)	177	17	47	210	196	7,32	8,10	6,92	7,11	7,16
200	202		50	235	222	8,37	9,35	7,75	7,98	8,05
(225)	226			260	248	9,45	9,25	8,72	8,98	9,06
250	254	18		288	278	10,99	10,69	10,14	12,20	12,30
300	303			340	330	14,82	14,28	14,10	13,81	14,11
350	351			390	382	17,69	18,65	17,64	16,35	16,72
400	398			440	432	20,55	19,69	19,30	18,83	19,31
(450)	450			494	484	23,63	23,60	21,90	21,62	22,24
500	501	19		545	535	26,63	29,10	25,90	24,44	25,10
600	602		55	650	636	35,79	35,60	33,40	37,49	33,67
(700)	692		55	740	726	44,31	44,10	41,10	40,60	41,86
800	792		60	844	826	56,17	55,20	52,20	51,67	53,36
(900)	892	21		944	926	66,79	–	–	–	–
1000	992	21		1044	1028	73,51
1200	1192	23	70	1248	1228	111,43
1400	1392	27	85	1456	1428	156,58
1600	1592	32	95	1660	1628	218,57

GOST 12821-80 Flange PN0.6MPa Dimensions Dimensions

Проход условный Dy	(b)	(d1)	(Dn)	(Dm)	Масса, кг
Проход условный Dy	(b)	(d1)	(Dn)	(Dm)	соединительным выступом (C)	выступом (C)	впадиной (C)	шипом (C)	пазом (C)
10	10	8	15	22	0,34	0,34	0,32	0,34	0,33
15		12	19	28	0,40	0,40	0,38	0,40	0,40
20		18	26	36	0,53	0,53	0,50	0,53	0,52
25	12	25	33	42	0,76	0,77	0,72	0,75	0,75
32		31	39	50	1,10	1,08	1,04	1,08	1,08
40		38	46	60	1,36	1,37	1,28	1,30	1,34
50		49	58	70	1,53	1,51	1,44	1,46	1,47
65		66	77	88	1,97	2,06	1,83	1,72	1,75
80	13	78	90	102	2,76	2,76	2,80	2,65	2,72
100	13	96	110	122	3,35	3,04	3,03	3,03	3,04
125	15	121	135	148	4,66	4,24	3,66	4,50	4,55
150	15	146	161	172	5,37	5,85	4,93	5,29	5,35
(175)	17	177	196	210	7,32	8,10	6,92	7,11	7,16
200		202	222	235	8,37	9,35	7,75	7,98	8,05
(225)		226	248	260	9,45	9,25	8,72	8,98	9,06
250	18	254	278	288	10,99	10,69	10,14	12,20	12,30
300		303	330	340	14,82	14,28	14,10	13,81	14,11
350		351	382	390	17,69	18,65	17,64	16,35	16,72
400		398	432	440	20,55	19,69	19,30	18,83	19,31
(450)		450	484	494	23,63	23,60	21,90	21,62	22,24
500	19	501	535	545	26,63	29,10	25,90	24,44	25,10
600		602	636	650	35,79	35,60	33,40	37,49	33,67
(700)		692	726	740	44,31	44,10	41,10	40,60	41,86
800		792	826	844	56,17	55,20	52,20	51,67	53,36
(900)	21	892	926	944	66,79	–	–	–	–
1000	21	992	1028	1044	73,51
1200	23	1192	1228	1248	111,43
1400	27	1392	1428	1456	156,58
1600	32	1592	1628	1660	218,57

GOST 12821-80 Flange PN1.0MPa Dimensions

Проход условный Dy	(Dm)	(d1)	(Dn)	(b)	(h4)	Масса, кг
Проход условный Dy	(Dm)	(d1)	(Dn)	(b)	(h4)	соединительным выступом (C)	выступом (C)	впадиной (C)	шипом (C)	пазом (C)
10	25	8	15	10	33	0,50	0,50	0,48	0,50	0,49
15	30	12	19	10	33	0,58	0,58	0,54	0,57	056
20	38	18	26	12	36	0,87	0,87	0,81	0,87	0,83
25	45	25	33	12	38	1,05	1,05	0,98	1,03	1,02
32	55	31	39	13	40	1,54	1,53	1,45	1,50	1,49
40	62	38	46		42	1,83	1,78	1,71	1,74	1,78
50	76	49	58		42	2,26	2,23	2,15	2,15	2,21
65	94	66	77	15	45	3,17	3,11	2,92	3,06	3,14
80	105	78	90	15	47	3,67	3,60	3,46	3,54	3,65
100	128	96	110	17	48	4,70	4,70	4,49	4,50	4,54
125	156	121	135	19	57	6,71	6,58	6,27	6,12	6,23
150	180	146	161			8,17	8,20	7,77	8,80	8,90
(175)	210	177	196			9,71	9,57	9,09	9,36	9,49
200	240	202	222		58	11,35	11,00	10,47	10,28	10,32
(225)	268	226	248		60	13,24	13,04	12,40	12,64	12,83
250	290	254	278	21		14,64	14,39	13,86	13,64	13,83
300	345	303	330	22		18,66	19,30	17,70	18,52	18,90
350	400	351	382			24,00	21,70	22,56	22,70	23,00
400	445	398	432			30,00	30,35	27,65	28,00	28,50
(450)	500	450	484		65	33,33	34,69	31,30	31,21	31,83
500	550	501	535	24		39,20	40,00	37,00	36,91	37,60
600	650	602	636	24		48,80	50,00	46,60	45,52	48,70
(700)	744	692	726	25		65,26	64,70	60,50	59,86	62,28
800	850	792	826	27	75	87,24	86,10	80,40	81,25	84,28
(900)	950	892	926	29	80	103,02	–	–	–	–
1000	1050	992	1028	29	80	119,19
1200	1256	1192	1228	33	90	179,91

GOST 12821-80 Flange PN1.6MPa Dimensions

Проход условный Dy	(h4)	(Dm)	(d1)	(b)	(Dn)	Масса, кг
Проход условный Dy	(h4)	(Dm)	(d1)	(b)	(Dn)	соединительным выступом (C)	выступом (C)	впадиной (C)	шипом (C)	пазом (C)
10	33	26	8	12	15	0,59	0,60	0,58	0,59	0,58
15	33	30	12		19	0,68	0,68	0,65	0,67	0,66
20	36	28	18		26	0,87	0,87	0,82	0,85	0,84
25	38	45	25		33	1,05	1,05	0,99	1,03	1,02
32	40	55	31	13	39	1,54	1,54	1,48	1,50	1,50
40	42	64	38		46	1,85	1,81	1,77	1,77	1,81
50	45	76	49		58	2,28	2,24	2,16	2,17	2,23
65	47	94	66	15	77	3,19	3,17	3,05	3,06	3,14
80	50	110	78	17	90	4,21	4,15	4,04	4,06	4,17
100	50	130	96	17	110	4,90	4,80	4,65	4,72	4,78
125	57	156	121	19	135	6,75	6,76	6,47	6,55	6,66
150		180	146	19	161	8,30	8,28	7,88	7,96	8,08
(175)		210	177	21	196	10,37	9,79	9,32	10,05	10,17
200	58	240	202		222	11,79	11,72	11,28	11,04	11,20
(225)	65	268	226		248	14,12	14,48	13,55	13,60	13,70
250	65	292	254	23	278	17,36	15,00	14,30	16,67	16,86
300	66	346	303	24	330	22,76	22,65	20,83	21,60	22,10
350	70	400	351	28	382	32,04	32,00	29,43	30,60	33,10
400	75	450	398	32	432	43,00	42,64	41,10	41,00	41,70
(450)	85	506	450	34	484	54,00	53,50	52,20	51,40	52,40
500	90	559	501	38	535	70,97	70,32	69,00	68,00	69,90
600	90	660	602	41	636	99,30	97,81	96,73	94,50	96,60
(700)	95	750	692	43	726	105,90	105,97	102,00	100,70	101,10
800	95	850	792	45	826	130,57	118,79	115,00	124,80	127,6
(900)	110	958	892	47	926	157,83	–	–	–	–
1000	110	1060	992	49	1028	203,39
1200	125	1268	1192	51	1228	284,94

GOST 12821-80 Flange PN2.5MPa Dimensions

Проход условный Dy	(h4)	(d1)	(b)	(Dm)	(Dn)	Масса, кг
Проход условный Dy	(h4)	(d1)	(b)	(Dm)	(Dn)	соединительным выступом (C)	выступом (C)	впадиной (C)	шипом (C)	пазом (C)
10	33	8	14	26	15	0,68	0,69	0,66	0,68	0,67
15	33	12		30	19	0,79	0,78	0,75	0,80	0,78
20	34	18		38	26	0,97	0,99	0,93	0,97	0,95
25	36	25		45	33	1,18	1,19	1,13	1,16	1,15
32	43	31	16	56	39	1,83	1,85	1,78	1,81	1,80
40	45	38	16	64	46	2,19	2,16	2,10	2,11	2,15
50	45	49	17	76	58	2,78	2,76	2,47	2,69	2,75
65	50	66	19	96	77	3,71	3,62	3,60	3,55	3,62
80	52	78	19	110	90	4,44	4,32	4,27	4,26	4,48
100	58	96	21	132	110	6,51	6,58	6,27	6,41	6,49
125	65	121	23	160	135	9,41	9,45	9,14	9,27	9,37
150	68	146	25	186	161	12,52	12,56	11,90	12,01	12,17
(175)	70	177	25	216	196	13,88	13,94	13,63	13,65	13,83
200	75	202	27	245	222	17,44	17,21	16,86	16,36	16,62
(225)		226	29	270	248	21,56	21,68	21,15	22,54	22,86
250		254	29	300	278	24,40	24,08	23,27	25,37	25,74
300	80	303	32	352	330	33,29	32,40	31,94	32,42	33,16
350	85	351	36	406	382	46,57	45,60	44,68	45,40	46,23
400	100	398	40	464	432	64,81	63,58	62,41	63,48	64,59
(450)		450	42	515	484	72,26	71,60	70,70	70,80	71,95
500		500	44	570	535	88,91	88,20	86,50	86,48	88,08
600	115	600	49	670	636	123,70	122,00	105,70	119,50	122,17
(700)	125	690	53	766	726	166,81	164,02	162,70	157,53	160,82
800	135	790	55	874	826	213,90	211,00	209,00	210,00	214,68
(900)	145	892	57	980	926	252,91	–	–	–	–
1000	150	992	59	1084	1028	312,12
1200	160	1192	62	1288	1228	387,50

GOST 12821 PN6 Carbon Steel Welding Neck Flange Dimensions

GOST 12820 PN16 Flat Flange Dimensions

(Dn) mm	(D) mm	(D1) mm	(dв) mm	(b) mm	(d) mm	(n-￠)	Weight In Kilogram
15	95	65	19	12	14	4	0,61
20	105	75	26	14	14	4	0,86
25	115	85	33	16	14	4	1,17
32	135	100	39	16	18	4	1,58
40	145	110	46	17	18	4	1,96
50	160	125	59	19	18	4	2,58
65	180	145	78	21	18	4	3,42
80	195	160	91	21	18	4	3,71
100	215	180	110	23	18	8	4,73
125	245	210	135	25	18	8	6,38
150	280	240	161	25	22	8	7,81
200	335	295	222	27	22	12	10,10
250	405	355	273	28	26	12	14,49
300	460	410	325	28	26	12	17,78
350	520	470	377	30	26	16	22,88
400	580	525	426	34	30	16	31,00
500	710	650	530	44	33	20	57,01
600	840	770	630	45	39	20	80,03
800	1 020	950	820	49	39	24	104,41
1000	1255	1170	1 020	58	45	28	179,37
1200	1485	1390	1220	71	52	32	297,78

GOST 12836 PN16 Blind Flange Dimensions

NPS	Weight In KG	(D)	(D1)	Holes Number	(H)	(D4)	(b)	(D3)	(D2)	(h1)
15	95	65	45	12	10	14	2	2	4	0.43
20	105	75	58	12	16	14	2	2	4	0.55
25	115	85	68	12	22	14	2	2	4	0.67
32	135	100	78	12	28	18	2	2	4	0.91
40	145	110	88	14	36	18	3	2	4	1.24
50	160	125	102	14	46	18	3	2	4	1.55
65	180	145	122	14	60	18	3	2	4	2.04
80	195	160	138	14	76	18	3	2	4	2.44
100	215	180	158	16	94	18	3	2	8	3.51
125	245	210	188	16	118	18	3	2	8	4.69
150	280	240	212	18	142	23	3	2	8	6.99
200	335	295	268	20	196	23	3	2	12	11.49
250	390	355	320	24	244	27	3	2	12	19.74
300	405	410	378	28	294	27	4	3	12	29.58
350	460	470	438	32	344	27	4	3	16	44.22
400	520	525	490	34	390	30	4	3	16	59.86
500	580	650	610	40	490	33	4	3	20	102.69
600	710	770	720	45	590	40	5	4	20	161.98
800	840	950	900	52	780	40	5	4	24	300.6
1000	1020	1170	1110	63	980	46	5	4	28	542.16
1200	1485	1390	1325	75	1180	52	5	4	32	922.18

Check Gost 33259 flange dimensions of Class 150/ 300/ 600, buy large diameter GOST Standard Flange at factory price in India

Gost 33259 Flange Dimensions

Diameter conditional (DN), millimeter	O.D. Of (D), millimeter	Diameter of spacing (D0), millimeter	Diameter internal (dB), millimeter	Flange wall thickness (b), millimeter	fastener Size (d0), millimeter	mounting holes Number (n), pcs	Weight of one flange, kilogram
15	80/95	55/65	nineteen	10/10	11/14	4/4	0.3 / 0.5
20	90/105	65/76	nineteen	12/12	11/14	4/4	0.5 / 0.7
25	100/115	75/85	nineteen	12/12	11/14	4/4	0.6 / 0.9
32	120/135	90/100	39	13/14	14/18	4/4	1.1 / 1.4
40	130/145	100/110	46	13/15	14/18	4/4	1.2 / 2
50	140/160	110/125	59	13/15	14/18	4/4	1.3 / 2.1
65	160/180	130/145	78	13/17	14/18	4/4	1.6 / 2.8
80	180/195	150/160	91	15/17	18/18	4/4	2.4 / 3.2
100	205/215	170/180	110	15/19	18/18	4/8	2.8 / 4
125	235/245	200/210	135	17/21	18/18	8/8	3.8 / 5.4
150	260/280	225/240	161	17/21	18/22	8/8	4.4 / 6.6
200	315/335	280/295	222	19/21	18/22	8/8	5.9 / 8
250	370/390	335/350	273	20/23	18/22	12/12	7.6 / 10
300	435/440	395/400	325	20/24	22/22	12/12	10.2 / 13
350	485/500	445/460	377	22/24	22/22	12/16	12.6 / 16
400	535/565	495/515	426	24/26	22/26	16/16	15.2 / 21
500	640/670	600/620	530	25/28	22/26	16/20	19/28
600	755/780	705/725	630	25/31	26/30	20/20	26/40
800	975/1010	920/950	820	27/37	30/33	24/24	46/79
1000	1175/1220	1120/1160	1020	31/43	30/33	28/28	64/118

Manufacturer of GOST Flange in FF/ RTJ and Raised Face, our inventory includes GOST 12821-80 Blind, Slip On, Weld Neck and Socket Weld Flange

GOST 12821-80 PN16 Slip On Flange Wall Thickness

NPS	Outer Diameter (O.D)	Minimum Wall Thickness (T)	(RF) Diameter (R)	Number of Bolt Holes	Holes Diameter	BC (Bolt Circle)	SO Bore Inner Diameter (SB)	WN Bore Inner Diameter (WB)	Diameter Hub Base (HB)	Diameter of Hub Top (HT)	SO Length (SL)	WN Length (WL)
¹⁄₂	3.50	0.38	1.38	4	0.62	2.38	0.88	0.62	1.19	0.84	0.56	1.81
³⁄₄	3.88	0.44	1.69	4	0.62	2.75	1.09	0.82	1.50	1.05	0.56	2.00
1	4.25	0.50	2.00	4	0.62	3.12	1.36	1.05	1.94	1.32	0.62	2.12
1¹⁄₄	4.62	0.56	2.50	4	0.62	3.50	1.70	1.38	2.31	1.66	0.75	2.19
1¹⁄₂	5.00	0.62	2.88	4	0.62	3.88	1.95	1.61	2.56	1.90	0.81	2.38
2	6.00	0.69	3.62	4	0.75	4.75	2.44	2.07	3.06	2.38	0.94	2.44
2¹⁄₂	7.00	0.81	4.12	4	0.75	5.50	2.94	2.47	3.56	2.88	1.06	2.69
3	7.50	0.88	5.00	4	0.75	6.00	3.57	3.07	4.25	3.50	1.12	2.69
3¹⁄₂	8.50	0.88	5.50	8	0.75	7.00	4.07	3.55	4.81	4.00	1.19	2.75
4	9.00	0.88	6.19	8	0.75	7.50	4.57	4.03	5.31	4.50	1.25	2.94
5	10.00	0.88	7.31	8	0.88	8.50	5.66	5.05	6.44	5.56	1.38	3.44
6	11.00	0.94	8.50	8	0.88	9.50	6.72	6.07	7.56	6.63	1.50	3.44
8	13.50	1.06	10.62	8	0.88	11.75	8.72	7.98	9.69	8.63	1.69	3.94
10	16.00	1.12	12.75	12	1.00	14.25	10.88	10.02	12.00	10.75	1.88	3.94
12	19.00	1.19	15.00	12	1.00	17.00	12.88	12.00	14.38	12.75	2.12	4.44
14	21.00	1.31	16.25	12	1.12	18.75	14.14	13.25	15.75	14.00	2.19	4.94
16	23.50	1.38	18.50	16	1.12	21.25	16.16	15.25	18.00	16.00	2.44	4.94
18	25.00	1.50	21.00	16	1.25	22.75	18.18	17.25	19.88	18.00	2.62	5.44
20	27.50	1.62	23.00	20	1.25	25.00	20.20	19.25	22.00	20.00	2.81	5.62
22	29.50	1.75	25.25	20	1.38	27.25	22.22	21.25	24.25	22.00	3.07	5.82
24	32.00	1.81	27.25	20	1.38	29.50	24.25	23.25	26.12	24.00	3.19	5.94

Russian GOST Flange Weight

Normal Size Of Steel Pipe		Dimensions In Millimeter		ASME B16.5 Flanges Weight In Kilogram
Normal Size Of Steel Pipe In Inches	Size In Millimeter	Class 150 Flanges Outer Daimeter (O.D.) In (MM)	150# Flanges Wall Thickness Of (D) In M)	(GOST Slip On Flanges) (GOST Socket Weld Flanges)	(GOST Weld Neck Flanges)	(GOST Blind Flanges)
1/2	15	88.9	11.2	0.4	0.5	0.4
3/4	20	98.6	12.7	0.6	0.7	0.6
1	25	108	14.2	0.8	1	0.9
1 1/4	32	117.3	15.7	1	1.3	1.2
1 1/2	40	127	17.5	1.3	1.7	1.5
2	50	152.4	19.1	2.1	2.6	2.4
2 1/2	65	177.8	22.4	3.3	4.1	3.9
3	80	190.5	23.9	3.9	4.9	4.9
3 1/2	90	215.9	23.9	4.8	6.1	6.2
4	100	228.6	23.9	5.3	6.8	7.0
5	125	254	23.9	6.1	8.6	8.6
6	150	279.4	25.4	7.5	10.6	11.3
8	200	342.9	28.4	12.1	17.6	19.6
10	250	406.4	30.2	16.5	24	28.6
12	300	482.6	31.8	26.2	36.5	43.2
14	350	533.4	35.1	34.6	48.4	58.1
16	400	596.9	36.6	44.8	60.6	76.1
18	450	635	39.6	48.9	68.3	93.7
20	500	698.5	42.9	61.9	84.5	122.0

GOST Standard Flanges Sizes

Normal Pipe Size	DN
1/2	15
3/4	20
1	25
1 1/4	32
1 1/2	40
2	50
2 1/2	65
3	80
4	100

PN 250 GOST 33259 Flanges for fittings, valves and pipelines, manufacturer of GOST 12815-80 Orifice and Lap Joint Flange in various pressure rating

GOST Pipe Flange Pressure Rating

GOST 33259 Plate Flange Bolt Chart

	Class 150				Class 300				Class 600
NPS	# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud		# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud		# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud
			1/16 RF	RTJ			1/16 RF	RTJ			1/4 RF	RTJ
1/2	4	0.50	2-1/4	–	4	0.50	2-1/2	3	4	0.50	3	3
3/4	4	0.50	2-1/2	–	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
1	4	0.50	2-1/2	3	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
1-1/4	4	0.50	2-3/4	3-1/4	4	0.63	3-1/4	3-3/4	4	0.63	3-3/4	3-3/4
1-1/2	4	0.50	2-3/4	3-1/4	4	0.75	3-1/2	4	4	0.75	4-1/4	4-1/4
2	4	0.63	3-1/4	3-3/4	8	0.63	3-1/2	4	8	0.63	4-1/4	4-1/4
2-1/2	4	0.63	3-1/2	4	8	0.75	4	4-1/2	8	0.75	4-3/4	4-3/4
3	4	0.63	3-1/2	4	8	0.75	4-1/4	4-3/4	8	0.75	5	5
3-1/2	8	0.63	3-1/2	4	8	0.75	4-1/4	5	8	0.88	5-1/2	5-1/2
4	8	0.63	3-1/2	4	8	0.75	4-1/2	5	8	0.88	5-3/4	5-3/4
5	8	0.75	3-3/4	4-1/4	8	0.75	4-3/4	5-1/4	8	1.00	6-1/2	6-1/2
6	8	0.75	4	4-1/2	12	0.75	4-3/4	5-1/2	12	1.00	6-3/4	6-3/4
8	8	0.75	4-1/4	4-3/4	12	0.88	5-1/2	6	12	1.13	7-1/2	7-3/4
10	12	0.88	4-1/2	5	16	1.00	6-1/4	6-3/4	16	1.25	8-1/2	8-1/2
12	12	0.88	4-3/4	5-1/4	16	1.13	6-3/4	7-1/4	20	1.25	8-3/4	8-3/4
14	12	1.00	5-1/4	5-3/4	20	1.13	7	7-1/2	20	1.38	9-1/4	9-1/4
16	16	1.00	5-1/4	5-3/4	20	1.25	7-1/2	8	20	1.50	10	10
18	16	1.13	5-3/4	6-1/4	24	1.25	7-3/4	8-1/4	20	1.63	10-3/4	10-3/4
20	20	1.13	6-1/4	6-3/4	24	1.25	8	8-3/4	24	1.63	11-1/4	11-1/2
24	20	1.25	6-3/4	7-1/4	24	1.50	9	10	24	1.88	13	13-1/4

	Class 900				Class 1500				Class 2500
NPS	# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud		# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud		# Studs And Bolts	Diameter of Studs And Bolts	Length of Stud
			1/4 RF	RTJ			1/4 RF	RTJ			1/4 RF	RTJ
1/2	4	0.75	4-1/4	4-1/4	4	0.75	4-1/4	4-1/4	4	0.75	4-3/4	4-3/4
3/4	4	0.75	4-1/2	4-1/2	4	0.75	4-1/2	4-1/2	4	0.75	5	5
1	4	0.88	5	5	4	0.88	5	5	4	0.88	5-1/2	5-1/2
1-1/4	4	0.88	5	5	4	0.88	5	5	4	1.00	6	6
1-1/2	4	1.00	5-1/2	5-1/2	4	1.00	5-1/2	5-1/2	4	1.13	6-3/4	6-3/4
2	8	0.88	5-3/4	5-3/4	8	0.88	5-3/4	5-3/4	8	1.00	7	7
2-1/2	8	1.00	6-1/4	6-1/4	8	1.00	6-1/4	6-1/4	8	1.13	7-3/4	8
3	8	0.88	5-3/4	5-3/4	8	1.13	7	7	8	1.25	8-3/4	9
4	8	1.13	6-3/4	6-3/4	8	1.25	7-3/4	7-3/4	8	1.50	10	10-1/4
5	8	1.25	7-1/2	7-1/2	8	1.50	9-3/4	9-3/4	8	1.75	11-3/4	12-1/4
6	12	1.13	7-1/2	7-3/4	12	1.38	10-1/4	10-1/2	8	2.00	13-1/2	14
8	12	1.38	8-3/4	8-3/4	12	1.63	11-1/2	11-3/4	12	2.00	15	15-1/2
10	16	1.38	9-1/4	9-1/4	12	1.88	13-1/4	13-1/2	12	2.50	19-1/4	20
12	20	1.38	10	10	16	2.00	14-3/4	15-1/4	12	2.75	21-1/4	22
14	20	1.50	10-3/4	11	16	2.25	16	16-3/4	–	–	–	–
16	20	1.63	11-1/4	11-1/2	16	2.50	17-1/2	18-1/2	–	–	–	–
18	20	1.88	12-3/4	13-1/4	16	2.75	19-1/2	20-3/4	–	–	–	–
20	20	2.00	13-3/4	14-1/4	16	3.00	21-1/4	22-1/4	–	–	–	–
24	20	2.50	17-1/4	18	16	3.50	24-1/4	25-1/2	–	–	–	–

Face Types Of GOST 12821 Flange

GOST 12820 Flange Tolerance

Type Of ASME/ ANSI B16.5 2 Inch Stainless Flange	Diameter	Tolerance Chart
(A)	(Outer Diameter)	When Outer Diameter is 24 Inch or less: ±1/16" (1.6 mm) When Outer Diameter is over 24": ±1/8" (3.2 mm)
(D)	(Inner Diameter)	10 Inches and smaller: ±1/32" (0.8 in mm) 12 Inches thru 18": +1/8" (3.2 in mm) 20 Inches and larger: -1/16" (1.6 in mm)
(B)	Contact Face	1/16" (RF): ±1/32" (0.8 mm) 1/4" (RF), Tongue And Groove (male And female): ±1/64" (0.4 mm)
(J)	Hub At Base Dai.	When hub base is 24 inches or smaller: ±1/16" (1.6 millimeter) When hub base is over 24": ±1/8" (3.2 millimeter)
(H)	Diameter of hub at point of welding	5 inch or smaller: +3/32" (2.4 mm), -1/32" (0.8 millimeter) 6 inch or larger: +5/32" (4.0 millimeter), -1/32 (0.8 mm)
(P)	Drilling	(B.C.): ±1/16" (1.6 mm) (B.H.) spacing: ±1/32" (0.8 mm)
	Eccentricity of (bc) with respect to facing	2 1/2" or smaller ±1/32" (0.8 mm) max. 3" or larger ±1/16" (1.6 mm) max.
(C)	(W.T.)	18 inch or smaller: ±1/8" (3.2 mm), -0" 20 inch or larger: ±3/16" (4.8 mm), -0"
(K)	hub Length	10 Inch or smaller: ±1/16" (1.6 millimeter) 12 Inch or larger: ±1/8" (3.2 millimeter)

Gaskets For GOST 12815 RTJ Flanges

(Normal Size Of Steel Pipes) In Inch	(I.D.) Inner Daimeter Gasket	(O.D.) Outer Daimeter Gasket
(Normal Size Of Steel Pipes) In Inch	(I.D.) Inner Daimeter Gasket	Class 150#/ LB	Class 300#/ LB	Class 400#/ LB	Class 600#/ LB	Class 900#/ LB
1/2	0.84	1.875	2.125	2.125	2.125	2.50
3/4	1.06	2.25	2.625	2.625	2.625	2.75
1	1.31	2.625	2.875	2.875	2.875	3.125
1 1/4	1.66	3	3.25	3.25	3.25	3.50
1 1/2	1.91	3.375	3.75	3.75	3.75	3.875
2	2.38	4.125	4.375	4.375	4.375	5.625
2 1/2	2.88	4.875	5.125	5.125	5.125	6.50
3	3.50	5.375	5.875	5.875	5.875	6.625
4	4.50	6.875	7.125	7.00	7.625	8.125
5	5.56	7.75	8.50	8.375	9.50	9.75
6	6.62	8.75	9.875	9.75	10.50	11.375
8	8.62	11	12.125	12.00	12.625	14.125
10	10.75	13.375	14.25	14.125	15.75	17.125
12	12.75	16.125	16.625	16.50	18.00	19.625

GOST 12815-80 Flange Surface Finish Chart

Normal Pipe Size	(A)	(B)
1/2	3.0	1.5
3/4	3.0	1.5
1	3.0	1.5
1-1/4	3.0	1.5
1-1/2	3.0	1.5
2	3.0	1.5
2-1/2	3.0	1.5
3	4.5	1.5
3-1/2	6.0	3.0
4	6.0	3.0
5	6.0	3.0
6	6.0	3.0
8	8.0	4.5
10	8.0	4.5
12	8.0	4.5
14	8.0	4.5
16	10.0	4.5
18	12.0	6.0
20	12.0	6.0
22	12.0	6.0
24	12.0	6.0

GOST Raised Face Flange Applications

Specialty Chemicals
Power Generation
Condensers
Chemical Equipment
Gas Processing
Pulp and Paper Industry

Sea Water Equipment
Pharmaceutical Equipment
Off-Shore Oil Drilling Companies
Petrochemicals
Heat Exchangers
Pharmaceuticals

GOST 12820-80 Flange Forging Process