Composite Weld Neck Flanges

Type and Construction
The weld neck stub ends are in accordance with EEMUA 234, Section 1A for 16 and 20 bar systems. The range of sizes covered is ½ in./16 mm to 36 in./914 mm. Other sizes are available on request. The stub ends are subdivided in two types short (Type S) based on DIN 86037 and long (Type L) based on MSS SP-43 suit the appropriate pipe dimension. The Type L stub ends are included to facilitate the attachments of this type of flange to butt weld welding fittings in accordance with EEMUA-234.

Dimensions
Dimensions are based on EEMUA-234, Section 1A, Tables 1.2-1.3.

Tolerances
The tolerances are based on EEMUA–234, Section 1A, Table 1.5.1.

Weld Preparation
The stub ends with S1<3mm are supplied with plain weld ends. Larger dimension are supplied with the weld bevel of 37 ½°±2 ½°.

Nominal Size in	mm	d₃ mm	d₄ mm	d₆ mm	16 bar d₇ mm	20 bar Type S d₇ mm	Type L H₁ mm	H mm	h₂ mm	h₅ mm	16 bar S min. mm	20 barS min. mm
½	16	16	40	18	Use 20 bar	12.00	35	51	4	15	Use 20 bar	2.00
¾	25	25	50	27	21.00	40	51	5	15	2.00
1	30	30	60	32	25.00	40	51	5	15	2.50
1¼	38	38	70	40	33.03	40	51	5	15	2.50
1½	44.5	44.5	80	46.5	39.53	45	51	6	15	2.50
2	57	57	99	59	52.16	45	64	6	15	2.50
2½	76.1	76.1	120	78	71.23	45	64	6	15	2.50
3	88.9	88.9	130	91	84.08	50	64	7	15	2.50
4	108	108	158	110	102.13	50	76	7	15	3.00
6	159	159	212	161.5	153.75	152.38	50	89	9	15	3.00	3.50
8	219.1	219.1	270	222	211.10	210.10	50	102	9	15	4.00	4.50
10	267	267	320	270	257.97	255.93	50	127	9	15	4.50	5.50
12	323.9	323.9	370	327	312.83	309.74	50	152	11	16	5.50	7.00
14	368	368	430	371	354.22	351.00	50	152	11	16	6.50	8.00
16	419	419	482	422	404.17	399.84	50	152	12	16	7.00	9.00
18	457.2	457.2	530	460	441.50	438.50	50	152	12	16	8.00	9.50
20	508	508	585	511	490.50	486.50	50	152	12	20	8.50	11.00
24	610	610	685	613	589.50	584.50	60	152	14	20	10.50	13.00
28	711	711	800	719	687.50	681.50	60	190	19	24	12.00	15.00
32	813	813	905	821	786.50	779.50	60	190	20.5	24	13.50	17.00
36	914	914	1000	922	883.50	876.50	60	190	22	32	15.50	19.00

Type and Construction
The weld neck backing flanges are in accordance with EEMUA 234, Section 1B and are suitable for both 16 and 20 bar pressure rating. The range of sizes covered is ½ in./16 mm to 36 in./914 mm Class 150. Other sizes are available on request. Drilling and outside diameter dimensions of flange sizes ½ in./16 mm-24 in./610 mm are in accordance with ANSI B16.5 and BS 1560, whereas the larger sizes, 28 in./711 mm -36 in./914 mm are in accordance with MSS SP-44. The backing flanges are manufactured from forged carbon steel in accordance with ASTM A105. The chemical composition and mechanical properties of the components are in accordance with EEMUA 234, Section 1B, Table 1.6.2. The recommended bolting is in accordance with ASTM A193-B7. Unless otherwise specified the flanges are protected by hot dipped galvanising. Additional organic coatings such as polyamide epoxy are available on request.

Dimensions
Dimensions are based on EEMUA - 234, Section 1B, Table 1.4.

Tolerances
The tolerances are based on EEMUA – 234, Section 1B, Table 1.5.2.

Nominal			b									Approx. Total Weight
Size		D	min.	d₂		d₅	K	No. Of	e			incl. Stub End - kg
in	mm	mm	mm	in	mm	mm	mm	Bolts	mm	S	16 bar L	S	20 bar L
½	16	89	14	5/8	15.9	19	60.3	4	2	as for 20 bar	0.64	0.66
¾	25	98	14	5/8	15.9	28	69.8	4	3	0.8	0.9
1	30	108	14	5/8	15.9	33	79.4	4	3	1	1
1¼	38	117	14	5/8	15.9	41	88.9	4	3	1.2	1.3
1½	44.5	127	14	5/8	15.9	48	98.4	4	3	1.5	1.6
2	57	152	18	3/4	19	62	120.6	4	3	2.5	2.6
2½	76.1	178	18	3/4	19	81	139.7	4	3	3.3	3.4
3	88.9	190	19	3/4	19	94	152.4	4	3	3.8	3.9
4	108	229	24	3/4	19	113	190.5	8	3	6.6	6.9
6	159	279	27	7/8	22.2	164	241.3	8	4	9.7	10.4	9.9	10.7
8	219.1	343	31	7/8	22.2	225	298.4	8	5	15	16.7	15.1	17
10	267	406	38	1	25.4	273	362	12	5	23.1	26.6	23.5	27.5
12	323.9	483	41	1	25.4	330	431.8	12	7	34.6	41	35.2	43.1
14	368	533	45	1 1/8	28.6	374	476.2	12	7	44.7	53.4	45.5	55.8
16	419	597	51	1 1/8	28.6	426	539.8	16	7	60	70.5	60.6	72.5
18	457.2	635	52	1 1/4	31.8	465	577.8	16	7	66	78	68	84.3
20	508	698	58	1 1/4	31.8	517	635	20	7	84.4	98.7	86	103.5
24	610	813	71	1 3/8	34.9	618	749.3	20	9	131.4	149.8	134	156.5
28	711	927	81	1 3/8	34.9	727	864	28	9	180.3	202.9	183.6	212.1
32	813	1060	95	1 5/8	41.1	829	978	28	9	269	296.8	275.5	311.2
36	914	1168	105	1 5/8	41.1	931	1086	32	9	335.8	369.8	341	385.8

Slip-On Stub Ends and Slip-On Backing Flanges

Type and Construction
The slip-on stub ends are in accordance with EEMUA 234, Section 2A and are suitable for 16 and 20 pressure rating. The range of sizes covered is ½ in./16 mm to 4 in./108 mm Class 150. The slip-on backing flanges are in accordance with EEMUA 234, Section 2B. Drilling and outside diameter dimensions are in accordance with ANSI B16.5 and BS 1560. The backing flanges are suitable for use in both 16 and 20 bar systems. The backing flanges are manufactured from forged carbon steel in accordance with ASTM A105. The chemical composition and mechanical properties of the components are in accordance with EEMUA 234, Section 2B, Table 2.5.2. The recommended bolting is in accordance with ASTM A193-B7. Unless otherwise specified the flanges are protected by hot dipped galvanising. Additional organic coatings such as polyamide epoxy are available on request.

Dimensions
Dimensions are based on EEMUA - 234, Section 2A and 2B, Tables 2.2 and 2.3.

Tolerances
The tolerances are based on EEMUA – 234, Section 2A and 2B, Tables 2.4.1 and 2.4.2.

Nominal		Inner Stub End Dimension	Outer Steel Flange - Dimension	No. Of Bolt	Approx.
Size		d₁	d₃	d₄	H	h	D	b	K	d₅	d₂	e	Holes	Total Weight
in	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	in	mm	mm	(kg)
½	16	16.07	21	40	16	5	89	14	60.3	23	5/8	15.9	3	4	0.61
¾	25	25.08	31	53	16	5	98	14	69.8	33	5/8	15.9	3	4	0.75
1	30	30.08	36	60	18	5	108	14	79.4	38	5/8	15.9	3	4	0.92
1¼	38	38.10	45	70	18	5	117	14	88.9	47	5/8	15.9	3	4	1.10
1½	44.5	44.60	51	80	19	5	127	14	98.4	53	5/8	15.9	3	4	1.30
2	57	57.23	67	99	19	6	152	18	120.6	69	3/4	19	3	4	2.20
2½	76.1	76.33	87	120	19	6	178	18	139.7	89	3/4	19	3	4	3.00
3	88.9	89.18	100	130	21	7	190	19	152.4	103	3/4	19	3	4	3.50
4	108	108.38	120	158	23	7	229	24	190.5	123	3/4	19	3	4	6.00

COMPOSITE WELD NECK FLANGES