Flanges

Aluminum alloy long neck flange

2022-01-26 11:25

Butt-welded aluminum flanges are also called long-necked aluminum flanges. The biggest difference between butt-welded aluminum flanges and other aluminum flanges is that they have a protruding high neck. The wall thickness of the protruding high neck will gradually butt with the height. The thickness of the pipe wall is the same as the diameter, which will increase the strength of the aluminum flange. Butt-welded aluminum flanges are mainly used in places with relatively large environmental changes, such as high-temperature, high-pressure and low-temperature pipelines.

Welded high-neck convex face (W.N.R.F)Aluminium Plate Flanges-fin heat exchanger, pressure rating* is PN20

(Class150), PN50 (Class300), PN100 (Class600) three gears, the temperature range is below 200°F.

The outer dimensions of the flange are related to the pressure rating. The flange dimensions of PN20, 50, and 100 are shown in Table 1, Table 2, Table 3 and Figure 1 respectively. The thickness "C" of the flanges at all levels must be calculated and determined according to the allowable stress of the material under the working conditions of the flange. The calculation regulations are carried out in accordance with Appendix 2 of Volume VⅢ-1 of ASME Code.

1.1 The size of the welded end of the pipe is determined by Figure 2, Figure 3, Figure 4, Figure 5 and Table 4 according to the different pipe sizes used. The material of the pipe can be the same as the flange or a different material from the flange.

2 Welding groove

2.1 When the inner diameter of the flange and the pipe are the same, when the wall thickness is t=5～22mm, beveled according to Figure 2; when t>22mm, beveled according to Figure 3.

2.2 When welding needs to use the bottom backing plate, the backing plate should be placed inside the pipe, and its bevel type shall be carried out according to Figure 4. When the inner diameter of the backing plate is the same as the inner diameter of the pipe, the thickness of the backing plate is:

δ=1/2(C-B)=1/2(A-0.79-1.75t-0.25-A+2t)=0.125t-0.25mm

Among them: B=A-2t; A——pipe outer diameter mm C=A-1.75t-1.04mm;

*The pressure rating is based on the material used in the applicable temperature range, without impact load, the maximum allowable working pressure bar (gauge pressure) PN20 is 20bar.

2.3 Material code: ASME SB247-6061-T6.

2.4 Pressure rating: PN×××.

2.5 Nominal diameter: DN×××.

2.6 Number of material book.

Flange type drawing

Example: The pressure rating is PN100, the nominal diameter is DN300mm, and the material book number is 94-081. The flange identification made by Hangyang meets the ASME SB247 standard and the material number is 6061-T6:

HYFM. ASME SB247-6061-T6, PN100, DN300, 94-081

Figure 1 Welded high-neck raised plane flange size

Table 1 PN20 (Class150) flange dimensions Dimensions unit: mm

Nominal nozzle size	Flange OD	Pot OD X	Neck OD A	Neck ID B	Total flange heightY	Center diameter of screw holeG	Convex outer diameterR	Screw hole diameterD	Number of bolts N	neck thick t	Convex height f	Transition filletr	Flange thickness C min*
15	90	30	21.5	16	48	60.5	35	16	4	2.75	2	3	11.5
20	100	38	26.5	21	52	70	43	16	4	2.75	2	3	13
25	110	49	33.5	26.5	56	79.5	51	16	4	3.5	2	3	14.5
32	120	59	42	35	57	89	64	16	4	3.5	2	3	16
40	130	65	48.5	41	62	98.5	73	16	4	3.75	2	3	17.5
50	150	78	60.5	52.5	64	120.5	92	20	4	4.0	2	3	19.5
65	180	90	73	62.5	70	139.5	105	20	4	5.25	2	3	22.5
80	190	108	89	78	70	152.5	127	20	4	5.5	2	3	24
100	230	135	114.5	102.5	76	190.5	157	20	8	6.0	2	3	24
125	255	164	141.5	128	89	216	186	22	8	6.75	2	3	24
150	280	192	168.5	154	89	241.5	216	22	8	7.25	2	3	25.5
200	345	246	219	202.5	102	298.5	270	22	8	8.25	2	3	29
250	405	305	273	254.5	102	362	324	26	12	9.25	2	3	30.5
300	485	365	324	305	114	432	381	26	12	9.5	2	3	32
350	535	400	355.5		127	476	413	30	12		2	3	35
400	600	457	406.5		127	540	470	30	16		2	3	37
450	635	505	457		140	578	533	33	16		2	5	40
500	700	559	508		145	635	584	33	20		2	5	43
600	815	664	609.5		152	749.5	692	36	20		2	5	48

Nominal nozzle size	Flange OD	Pot OD X	Neck OD A	Neck ID B	Total flange heightY	Center diameter of screw holeG	Convex outer diameterR	Screw hole diameterD	Number of bolts N	neck thick t	Convex height f	Transition filletr	Flange thickness C min*
15	95	38	21.5	16	52	66.5	35	16	4	2.75	2	3	14.5
20	120	48	26.5	21	57	82.5	43	20	4	2.75	2	3	16
25	125	54	33.5	26.5	62	89	51	20	4	3.5	2	3	17.5
32	135	64	42	35	65	98.5	64	20	4	3.5	2	3	19.5
40	155	70	48.5	41	68	114.5	73	22	4	3.75	2	3	21
50	165	84	60.5	52.5	70	127	92	22	8	4.0	2	3	22.5
65	190	100	73	62.5	76	149.5	105	22	8	5.25	2	3	25.5
80	210	117	89	78	79	168	127	22	8	5.5	2	3	29
100	255	146	114.5	102.5	86	200	157	22	8	6.0	2	3	32
125	280	178	141.5	128	98	235	186	22	8	6.75	2	3	35
150	320	206	168.5	154	98	270	216	22	12	7.25	2	3	37
200	380	260	219	202.5	111	330	270	26	12	8.25	2	3	41.5
250	445	321	273	254.5	117	387.5	324	30	16	9.25	2	3	48
300	520	375	324	305	130	451	381	33	16	9.5	2	3	51
350	585	426	355.5		143	514.5	413	33	20		2	3	54
400	650	483	406.5		146	571.5	470	36	20		2	3	57.5
450	710	533	457		159	629	533	36	24		2	5	60.5
500	775	587	508		162	686	584	36	24		2	5	63.5
600	915	702	609.5		168	813	692	42	24		2	5	70

Nominal nozzle size	Flange OD	Pot OD X	Neck OD A	Neck ID B	Total flange heightY	Center diameter of screw holeG	Convex outer diameterR	Screw hole diameterD	Number of boltsN	neck thick t	Convex height f	Transition filletr	Flange thickness C min*
15	95	38	21.5		52	66.5	35	16	4		7	3	14.5
20	120	48	26.5		57	82.5	43	20	4		7	3	16
25	125	54	33.5		62	89	51	20	4		7	3	17.5
32	135	64	42		67	98.5	64	20	4		7	3	21
40	155	70	48.5		70	114.5	73	22	4		7	3	22.5
50	165	84	60.5		73	127	92	22	8		7	3	25.5
65	190	100	73		79	149	105	22	8		7	3	29
80	210	117	89		83	168.5	127	22	8		7	3	32
100	275	152	114.5		102	216	157	26	8		7	3	38.5
125	330	189	141.5		114	267	186	30	8		7	3	44.5
150	356	222	168.5		117	292	216	30	12		7	3	48
200	420	273	219		133	349	270	33	12		7	3	55.5
250	510	343	273		152	432	324	36	16		7	5	63.5
300	560	400	324		156	489	381	36	20		7	5	66.5
350	605	432	355.5		165	527	413	39	20		7	5	70
400	685	495	406.5		178	603	470	42	20		7	5	76.5
450	745	546	457		184	654	533	45	20		7	5	83
500	815	610	508		190	724	584	45	24		7	5	89
600	940	718	609.5		203	838	692	52	24		7	5	102

Flanges

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