ASME B16.48 A182 UNS S31600 Spectacle Blind Flange Ring-Type Joint 4″ CL1500

Type: UNS S31600 Spectacle Blind Flange
Size: DN100 (4″)
Class Rate: 1500#
Material: 316 (S31600/1.4401)
Standard: ASME B16.48

China Figure-8 Blank Flange Manufacturer www.pipelinedubai.com offers ASME B16.48 A182 UNS S31600 Spectacle Blind Flange Ring-Type Joint, 4″, CL1500.

Chemical Composition and Mechanical Property For 316
Steel Grade	Chemical Composition									Mechanical Performance
	C(Max)	Si(Max)	Mn(Max)	P(Max)	S(Max)	Ni	Cr	Mo	N	Tensile Strength (Min）	Yield Strength (Min)
										Mpa	Mpa
316	0.08	0.75	2.00	0.045	0.03	10.0–14.0	16.0–18.0	2.00–3.00	0.1	515	205

What is a spectacle blind flange?

If the spade is put in between the flanges, it stops the fluid’s passage; Spectacle blind flange, also known as figure 8 flange which is combination of the two that can be rotated to function as single bind or a ring spacer. This kind of flange is generally a piece of metal than is cut to fit between two pipe flanges and usually sandwiched between two gaskets a spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. The Sharp is similar to a pair of glasses or spectacles – hence the name spectacle blind flange. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process piping system.
The whole idea of a spectacle blind Flange is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just by passed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valve off and pressure relieved prior to loosening flange bolts and swinging the blind.
Spectacle Blind Flange may have a different type of joint face (RF Raised Face, FF Flat Face, RTJ Ring Joint), depending the type of flange.
Spectacle Blind Flange  is usually used on the oil line with two different functions:

• If the spacer is put in between the flanges, the passage of the fluid is allowed.

The Spectacle Blind is inserted between two flanges: in order to guarantee a perfect  waterlight two gaskets are normally mounted , one on each side of spectacle blind.

Technical drawing for the female ring-joint facing (F/RTJ) figure-8 blank (spectacle blind flange) made in accordance with ASME B16.48. A: centerline distance; O: outside diameter of blank flange; B: inside diameter of the open end; T: blank thickness; W: web width; t: thickness of the tie bar.
The female ring-joint groove dimensions shall be in accordance with ASME B16.5. Size of the hole on the tie bar (where required due to bolt spacing) shall be the same as the flange bolt hole and located such that it will not interfere with bolting between two flanges. The thickness of the tie bar dimension t, shall be capable of supporting the weight of the blank in all orientations without permanent deformation to the tie bar.

Dimensions & Weights of ASME B16.48 F/RTJ) Figure-8 Blank (spectacle blind flange)

Basic dimensions for ASME B16.48 Class 150 figure-8 blanks (spectacle blind flanges) with female ring-joint facing (F/RTJ)

NPS	O	A	T	W	B
1	64	80	19.1	51	34
1-1/4	73	90	19.1	51	42
1-1/2	83	100	19.1	57	48
2	102	120	19.1	57	61
2-1/2	121	140	22.4	57	73
3	133	150	22.4	57	89
3-1/2	154	175	22.4	64	102
4	172	190	22.4	64	114
5	194	215	25.4	70	141
6	219	240	25.4	83	168
8	273	300	28.4	95	219
10	330	360	31.8	102	273
12	406	430	35.1	121	324
14	426	475	35.1	127	356
16	483	540	38.1	127	406
18	546	580	41.1	127	457
20	597	635	41.1	127	508
24	711	750	47.8	152	610

NPS	O	A	T	W	B
1/2	51	65	15.7	38	21
3/4	64	80	19.1	45	27
1	70	90	19.1	51	34
1-1/4	79	100	22.4	51	42
1-1/2	90	115	22.4	57	48
2	108	125	25.4	57	61
2-1/2	127	150	28.4	57	73
3	146	170	28.4	57	89
3-1/2	159	185	28.4	64	102
4	175	200	31.8	64	114
5	210	235	35.1	70	141
6	241	270	35.1	83	168
8	302	330	41.1	95	219
10	356	385	44.5	102	273
12	413	450	50.8	121	324
14	457	515	53.8	127	356
16	508	570	57.2	127	406
18	575	630	60.5	127	457
20	635	685	69.9	127	508
24	749	810	79.2	152	610

NPS	O	A	T	W	B
1/2	51	65	19.1	38	21
3/4	64	80	22.4	45	27
1	70	90	22.4	51	34
1-1/4	79	100	22.4	51	42
1-1/2	90	115	22.4	57	48
2	108	125	28.4	57	61
2-1/2	127	150	31.8	57	73
3	146	170	31.8	57	89
3-1/2	159	185	35.1	64	102
4	175	215	35.1	64	114
5	210	265	38.1	70	141
6	241	290	44.5	83	168
8	302	350	50.8	95	219
10	356	430	57.2	102	273
12	413	490	63.5	121	324
14	457	525	66.5	127	356
16	508	605	73.2	127	406
18	575	655	79.2	127	457
20	635	725	88.9	127	508
24	749	840	104.6	152	610

NPS	O	A	T	W	B
1/2	61	80	22.4	38	21
3/4	67	90	22.4	45	27
1	71	100	22.4	51	34
1-1/4	81	110	25.4	51	42
1-1/2	92	125	25.4	64	48
2	124	165	31.8	51	61
2-1/2	137	190	35.1	67	73
3	155	190	35.1	67	89
4	181	235	41.1	73	114
5	216	280	44.5	73	141
6	241	315	47.8	73	168
8	308	395	57.2	80	219
10	362	470	63.5	121	273
12	419	535	73.2	121	324
14	467	560	82.6	121	356
16	524	615	91.9	127	406
18	594	685	101.6	133	457
20	648	750	111.3	127	508
24	772	900	133.4	140	610

NPS	O	A	T	W	B
1/2	61	80	22.4	38	21
3/4	67	90	25.4	45	27
1	71	100	25.4	54	34
1-1/4	81	110	25.4	54	42
1-1/2	92	125	28.4	57	48
2	124	165	35.1	54	61
2-1/2	137	190	38.1	57	73
3	168	205	44.5	73	89
4	194	240	47.8	76	114
5	229	290	53.8	76	141
6	248	315	60.5	79	168
8	318	395	73.2	86	219
10	371	480	82.5	133	273
12	438	570	101.6	133	324
14	489	635	111.3	140	356
16	546	705	124.0	146	406
18	613	775	133.0	152	457
20	673	830	142.7	165	508
24	794	990	168.1	178	610

NPS	O	A	T	W	B
1/2	65	90	25.4	38	21
3/4	73	95	28.4	45	27
1	83	110	28.4	54	34
1-1/4	102	130	35.1	54	42
1-1/2	114	145	38.1	61	48
2	133	170	41.1	57	61
2-1/2	149	195	47.8	61	73
3	168	230	50.8	76	89
4	203	270	63.5	83	114
5	241	325	73.2	89	141
6	279	370	82.6	95	168
8	340	440	98.6	95	219
10	425	540	117.3	91	273
12	495	620	133.4	152	324

NPS	150#	300#	600#
1/2	0.11	0.24	0.36
3/4	0.16	0.37	0.55
1	0.22	0.44	0.70
1-1/4	0.47	0.54	1.19
1-1/2	0.61	0.73	1.59
2	0.92	1.40	2.24
2-1/2	1.02	1.90	3.47
3	1.53	2.51	4.67
3-1/2	2.88	3.77	6.20
4	3.38	4.54	8.64
5	4.17	7.61	14.72
6	6.40	10.14	20.22
8	9.79	20.31	34.32
10	16.89	30.37	61.83
12	29.10	45.22	91.09
14	35.32	68.44	111.71
16	52.91	98.16	164.91
18	65.45	128.33	201.95
20	87.34	164.02	287.92
24	133.62	258.63	429.73

NPS	900#	1500#	2500#
1/2	0.44	0.45	0.69
3/4	0.58	0.76	0.85
1	0.77	1.00	1.14
1-1/4	1.31	1.34	2.06
1-1/2	1.66	2.00	3.04
2	3.82	3.88	4.70
2-1/2	5.00	5.96	7.20
3	6.42	8.13	11.34
4	10.99	13.04	19.63
5	17.42	22.68	32.65
6	25.95	33.07	47.98
8	51.34	57.73	90.35
10	84.77	104.42	164.42
12	125.66	175.32	257.53
14	150.30	235.47	–
16	200.37	326.04	–
18	367.65	439.22	–
20	347.27	546.48	–
24	594.27	899.45	–

Pressure Ratings of ASME B16.48 Spectacle Blind Flange