Zhong Bo machinery manufacturing Co., ltd

Metal Expansion Joints

Our Compensators are mainly used in steel, pipelines, automobile and various other industries for generating high pressure in motors.

Offered compensators are manufactured using high quality aluminum and bronze & modern machinery in line with set international standards.

Widely demanded in steel industry because of their sturdy construction, resistance against corrosion & abrasion, superior performance and longer functional life.

In addition, we supply Metal Compensators in standard and customized packaging options to achieve the best safety during the transmit.

Category:Metal Expansion Joints

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Typical Narrow Arch Expansion Joint Movement/Spring Rate Capabilities

Nominal Pipe Size Expansion Joint		Nominal Face-to-face Minimum Length		MOVEMENTS								SPRING RATES
				AXIAL COMPRESSION		AXIAL EXTENSION		LATERAL DEFLECTION		DEGREES OF ANGULAR MOVEMENT	DEGREES OF TORSIONAL MOVEMENT	AXIAL COMPRESSION		AXIAL EXTENSION		LATERAL DEFLECTION		ANGULAR MOVEMENT


in	mm	in	mm	in	mm	in	mm	in	mm			lbs/in	N/mm	lbs/in	N/mm	lbs/in	N/mm	ft-lbs/ deg	Nm/deg
1*	25	6	150	7/16	11	1/4	6	1/2	13	27.5	3	235	41	304	53	350	61	0.04	0.05
1-1/4*	32	6	150	7/16	11	1/4	6	1/2	13	22.5	3	294	51	383	67	438	77	0.1	0.13
1-1/2*	40	6	150	7/16	11	1/4	6	1/2	13	18.5	3	353	62	459	80	524	92	0.15	0.2
2	50	6	150	7/16	11	1/4	6	1/2	13	14.5	3	423	74	552	97	700	123	0.3	0.41
2-1/2	65	6	150	7/16	11	1/4	6	1/2	13	11.5	3	530	93	689	121	762	133	0.5	0.68
3	75	6	150	7/16	11	1/4	6	1/2	13	10	3	635	111	828	145	824	144	0.8	1.1
3-1/2	88	6	150	7/16	11	1/4	6	1/2	13	8.3	3	742	130	965	169	888	155	1.3	1.8
4	100	6	150	7/16	11	1/4	6	1/2	13	7.5	3	848	148	1104	193	952	167	1.9	2.6
5	125	6	150	7/16	11	1/4	6	1/2	13	6	3	1058	185	1376	241	1092	191	3.7	5
6	150	6	150	7/16	11	1/4	6	1/2	13	5	3	1271	223	1652	289	1234	216	6.4	8.7
8	200	6	150	11/16	18	3/8	10	1/2	13	5.5	3	1412	247	1837	322	1506	264	12.7	17.2
10	250	8	200	11/16	18	3/8	10	1/2	13	4.5	3	1766	309	2296	402	1618	283	24.2	32.8
12	300	8	200	11/16	18	3/8	10	1/2	13	3.75	3	2118	371	2755	482	1896	332	42.1	57.1
14	350	8	200	11/16	18	3/8	10	1/2	13	3.25	2	1853	325	2411	422	2234	391	19.2	80.3
16	400	8	200	11/16	18	3/8	10	1/2	13	2.75	2	2118	371	2755	482	2572	450	76	103
18	450	8	200	11/16	18	3/8	10	1/2	13	2.5	1	2382	417	3101	543	2840	497	106	144
20	500	8	200	13/16	21	7/16	11	1/2	13	2.5	1	2649	464	3440	602	3176	556	152	206
22	550	10	250	13/16	21	7/16	11	1/2	13	2.25	1	2913	510	3785	663	3296	577	205	278
24	600	10	250	13/16	21	7/16	11	1/2	13	2	1	3178	557	4130	723	3412	597	274	371
26	650	10	250	15/16	24	1/2	13	1/2	13	2.3	1	3060	536	3980	697	3658	641	292	396
28	700	10	250	15/16	24	1/2	13	1/2	13	2	1	3296	577	4286	751	3904	684	382	518
30	750	10	250	15/16	24	1/2	13	1/2	13	2	1	3532	619	4594	804	4150	727	437	592
32	800	10	250	15/16	24	1/2	13	1/2	13	1.8	1	3769	660	4899	858	4876	854	555	752
34	850	10	250	15/16	24	1/2	13	1/2	13	1.75	1	4002	701	5602	981	5602	981	645	874
36	900	10	250	15/16	24	1/2	13	1/2	13	1.5	1	4238	742	5512	965	6328	1108	844	1144
38	950	10	250	15/16	24	1/2	13	1/2	13	1.5	1	4475	784	5818	1019	6502	1139	943	1278
40	1000	10	250	15/16	24	1/2	13	1/2	13	1.5	1	4708	824	6124	1072	6676	1169	1042	1413
42	1050	12	300	1-1/16	27	9/16	14	1/2	13	1.5	1	4452	780	5783	1013	6846	1199	1163	1577
44	1100	12	300	1-1/16	27	9/16	14	1/2	13	1.5	1	4664	817	6057	1061	7142	1251	1270	1722
46	1150	12	300	1-1/16	27	9/16	14	1/2	13	1.3	1	4870	853	6339	1110	7436	1302	1680	2278
48	1200	12	300	1-1/16	27	9/16	14	1/2	13	1.25	1	5087	891	6608	1157	7732	1354	1825	2474
50	1250	12	300	1-1/16	27	9/16	14	1/2	13	1.25	1	5300	928	6884	1206	8024	1405	1968	2668
52	1300	12	300	1-1/16	27	9/16	14	1/2	13	1.25	1	5512	965	7166	1255	8314	1456	2138	2899
54	1350	12	300	1-1/16	27	9/16	14	1/2	13	1.25	1	5724	1002	7435	1302	8606	1507	2308	3129
56	1400	12	300	1-1/16	27	9/16	14	1/2	13	1.25	1	5936	1039	7717	1351	8896	1558	2464	3341
58	1450	12	300	1-1/16	27	9/16	14	1/2	13	1	1	6148	1076	7992	1400	9184	1608	3310	4488
60	1500	12	300	1-1/16	27	9/16	14	1/2	13	1	0.5	6360	1114	8268	1448	9472	1659	3537	4795
66	1650	12	300	1-1/16	27	9/16	14	1/2	13	1	0.5	6996	1225	9095	1593	10216	1789	4288	5813
72	1800	12	300	1-1/16	27	9/16	14	1/2	13	0.9	0.5	7632	1337	9922	1738	10954	1918	5681	7702
78	1950	12	300	1-1/16	27	9/16	14	1/2	13	0.9	0.5	8268	1448	10748	1882	11902	2084	7022	9520
84	2100	12	300	1-1/16	27	9/16	14	1/2	13	0.8	0.5	8904	1559	11575	2027	12850	2250	8641	11715
96	2400	12	300	1-1/16	27	9/16	14	1/2	13	0.7	0.5	10176	1782	13228	2317	14750	2538	13441	18223
102	2550	12	300	1-1/16	27	9/16	14	1/2	13	0.66	0.5	10812	1893	14056	2462	15700	2749	16967	23003
108	2700	12	300	1-1/16	27	9/16	14	1/2	13	0.62	0.5	11448	2005	14883	2606	16652	2916	21855	29630
120	3000	12	300	1-1/16	27	9/16	14	1/2	13	0.56	0.5	12720	2228	16537	2896	18550	3249	29871	40498
132	3300	12	300	1-1/16	27	9/16	14	1/2	13	0.51	0.5	13992	2450	18190	3185	20288	3553	33547	45481
144	3600	12	300	1-1/16	27	9/16	14	1/2	13	0.47	0.5	15264	2673	19843	3475	22026	2857	42902	58164

Typical Wide Arch Expansion Joint Movement/Spring Rate Capabilities

Nominal Pipe Size Expansion Joint		Nominal Face-to-face		MOVEMENTS								SPRING RATES
				AXIAL COMPRESSION		AXIAL EXTENSION		LATERAL DEFLECTION		DEGREES OF ANGULAR MOVEMENT	DEGREES OF TORSIONAL MOVEMENT	AXIAL COMPRESSION		AXIAL EXTENSION		LATERAL DEFLECTION		ANGULAR MOVEMENT


in	mm	in	mm	in	mm	in	mm	in	mm			lbs/in	N/mm	lbs/in	N/mm	lbs/in	N/mm	ft-lbs/ deg	Nm/deg
1*	25	6	150	3/4	19	7/16	11	5/8	16	34.4	3	176	31	228	39	262	46	0.03	0.04
1-1/4*	32	6	150	3/4	19	7/16	11	5/8	16	28.1	3	220	38	287	50	328	57	0.075	0.1
2001/1/2	40	6	150	3/4	19	7/16	11	5/8	16	23.1	3	265	46	344	60	393	69	0.11	0.15
2	50	6	150	3/4	19	7/16	11	5/8	16	18.1	3	317	55	414	72	525	92	0.22	0.3
2002/1/2	65	6	150	3/4	19	7/16	11	5/8	16	14.4	3	397	69	517	90	571	100	0.375	0.51
3	75	6	150	3/4	19	7/16	11	5/8	16	12.5	3	476	83	621	109	618	108	0.6	0.81
2003/1/2	88	6	150	3/4	19	7/16	11	5/8	16	10.4	3	556	97	724	127	666	117	0.975	1.32
4	100	6	150	3/4	19	7/16	11	5/8	16	9.4	3	636	111	828	145	714	125	1.425	1.93
5	125	6	150	3/4	19	7/16	11	5/8	16	7.5	3	793	139	1032	181	819	143	3	4
6	150	6	150	3/4	19	7/16	11	5/8	16	6.2	3	953	167	1239	217	925	162	5	7
8	200	6	150	1-3/16	30	11/16	17	5/8	16	6.9	3	1059	185	1378	241	1129	198	10	13
10	250	8	200	1-3/16	30	11/16	17	3/4	19	5.6	3	1324	232	1722	302	1213	212	18	24
12	300	8	200	1-3/16	30	11/16	17	3/4	19	4.7	3	1588	278	2066	362	1422	249	32	43
14	350	8	200	1-3/16	30	11/16	17	3/4	19	4.1	2	1390	243	1808	317	1675	293	14	19
16	400	8	200	1-3/16	30	11/16	17	3/4	19	3.4	2	1588	278	2066	362	1929	338	57	77
18	450	8	200	1-3/16	30	11/16	17	3/4	19	3.1	1	1786	313	2326	407	2130	373	80	108
20	500	8	200	1-7/16	37	3/4	19	3/4	19	3.1	1	1987	348	2580	452	2382	417	114	155
22	550	10	250	1-7/16	37	3/4	19	3/4	19	2.8	1	2185	383	2839	497	2472	433	154	209
24	600	10	250	1-7/16	37	3/4	19	3/4	19	2.5	1	2383	417	3097	542	2559	448	205	278
26	650	10	250	1-5/8	41	1	25	3/4	19	2.9	1	2295	402	2985	523	2743	480	219	297
28	700	10	250	1-5/8	41	1	25	3/4	19	2.5	1	2472	433	3214	563	2928	513	286	388
30	750	10	250	1-5/8	41	1	25	3/4	19	2.5	1	2649	464	3445	603	3112	545	328	445
32	800	10	250	1-5/8	41	1	25	3/4	19	2.2	1	2827	495	3674	643	3657	640	416	564
34	850	10	250	1-5/8	41	1	25	3/4	19	2.2	1	3001	525	4201	736	4201	736	484	656
36	900	10	250	1-5/8	41	1	25	3/4	19	1.9	1	3178	556	4134	724	4746	831	633	926
38	950	10	250	1-5/8	41	1	25	3/4	19	1.9	1	3356	588	4363	764	4876	854	707	959
40	1000	10	250	1-5/8	41	1	25	3/4	19	1.9	1	3531	618	4593	804	5007	877	781	1059
42	1050	12	300	1-7/8	48	1	25	3/4	19	1.9	1	3339	585	4337	759	5134	899	872	1182
44	1100	12	300	1-7/8	48	1	25	3/4	19	1.9	1	3498	613	4543	796	5356	938	952	1291
46	1150	12	300	1-7/8	48	1	25	3/4	19	1.6	1	3652	640	4754	832	5577	977	1260	1708
48	1200	12	300	1-7/8	48	1	25	3/4	19	1.6	1	3815	668	4956	868	5799	1016	1369	1856
50	1250	12	300	1-7/8	48	1	25	3/4	19	1.6	1	3975	696	5163	904	6018	1054	1476	2001
52	1300	12	300	1-7/8	48	1	25	3/4	19	1.6	1	4134	724	5374	941	6235	1092	1603	2173
54	1350	12	300	1-7/8	48	1	25	3/4	19	1.6	1	4293	752	5576	976	6454	1130	1731	2347
56	1400	12	300	1-7/8	48	1	25	3/4	19	1.6	1	4452	780	5787	1013	6672	1168	1848	2505
58	1450	12	300	1-7/8	48	1	25	3/4	19	1.2	1	4611	807	5994	1050	6888	1206	2482	3365
60	1500	12	300	1-7/8	48	1	25	3/4	19	1.2	1	4770	835	6201	1086	7104	1244	2653	3597
66	1650	12	300	1-7/8	48	1	25	3/4	19	1.2	1	5247	919	6821	1194	7662	1342	3216	4360
72	1800	12	300	1-7/8	48	1	25	3/4	19	1.1	0.5	5724	1002	7441	1303	8215	1439	4261	5777
78	1950	12	300	1-7/8	48	1	25	3/4	19	1.1	0.5	6201	1086	8061	1412	8926	1563	5266	7140
84	2100	12	300	1-7/8	48	1	25	3/4	19	1	0.5	6678	1169	8681	1520	9637	1688	6481	8787
96	2400	12	300	1-7/8	48	1	25	3/4	19	0.87	0.5	7632	1337	9921	1737	11062	1937	10081	13668
102	2550	12	300	1-7/8	48	1	25	3/4	19	0.82	0.5	8109	1420	10542	1846	11775	2062	12725	17253
108	2700	12	300	1-7/8	48	1	25	3/4	19	0.77	0.5	8586	1503	11162	1955	12489	2187	16391	22223
120	3000	12	300	1-7/8	48	1	25	3/4	19	0.7	0.5	9540	1670	12403	2172	13912	2436	22403	30374
132	3300	12	300	1-7/8	48	1	25	3/4	19	0.64	0.5	10494	1838	13642	2389	15216	2665	25160	34112
144	3600	12	300	1-7/8	48	1	25	3/4	19	0.59	0.5	11448	2005	14882	2606	16519	2893	32176	43625

Metal Expansion Joints

Our Compensators are mainly used in steel, pipelines, automobile and various other industries for generating high pressure in motors.

Offered compensators are manufactured using high quality aluminum and bronze & modern machinery in line with set international standards.

Widely demanded in steel industry because of their sturdy construction, resistance against corrosion & abrasion, superior performance and longer functional life.

In addition, we supply Metal Compensators in standard and customized packaging options to achieve the best safety during the transmit.

Metal expansion joints are flexible corrugated “bellows”manufactured by forming of metal plates from wide range of steels – stainless also carbon. Could have circulares, or non-circular section, metal expansion joints are manufactured with welding ends, or flanges and for small dimensions also with threaded fittings.

Metal expansion joints with circular section are manufactured from dimension DN 50 up to DN 5000 mm.

Metal expansion joints with non-circular (rectangular section) are manufactured according to individual requirements of customer.

Material

The expansion joints are made from the following materials according to working conditions: BELLOWS standard: AISI 321, AISI 316Ti special: Inconel 625, Incoloy 825, Monel 400, Titanium, ... ENDINGS good welded steels grades 11, 12 and 17, or other according to working conditions INNER SLEEVE standard: AISI 304

Single Axial Expansion Joint (the compensator is composed of a bellow and a structural part, which is mainly used to absorb the axial displacement and cannot support the expansion joint of the bellows pressure thrust; Caliber: DN50-DN6000)

Working pressure: 0.01-4.0Mpa

External Pressurized Expansion Joint ( It consists of structural parts such as corrugated tubes that bear external pressure, outer tubes and end rings, and is mainly used to absorb axial displacement and cannot support the expansion thrust of corrugated tube pressure; Caliber: DN50-DN5000)

Working pressure: 0.25-4.0Mpa

Universal Untied Expansion Joint( It consists of two bellows and structural parts connected by the intermediate pipe, which is mainly used to absorb the axial and lateral combined displacement and cannot withstand the pressure thrust of the bellows expansion joint; Caliber: DN50-DN6000)

Working pressure: 0.01-4.0Mpa

Single Hinged Expansion Joint( It consists of a bellow and structural components such as pins, hinge plates and risers, which can only absorb angular displacement in a plane and can withstand the pressure thrust of the bellows; Caliber: DN50-DN5000;)

Working Pressure: 0.25-2.5Mpa

Single Gimbal Expansion Joint(It consists of a bellows and structural parts such as pins, hinge plates, universal rings and risers, which can absorb angular displacement in any plane and can withstand the pressure thrust of the bellows；Caliber:DN50-DN5000)

Working pressure: 0.25-2.5Mpa

Universal Tied Expansion Joint( It consists of two bellows connected to the middle pipe, structural rods such as tie rods, end plates and spherical and cone washers, which can absorb lateral displacement in any plane and can withstand the pressure thrust of the bellows；Caliber:DN50-DN5000)

Working pressure: 0.25-2.5Mpa

Universal Hinged Expansion Joint( It consists of two bellows connected to the middle pipe, structural parts such as pins, hinge plates and risers, which can only absorb lateral and angular displacement in one plane and can withstand the pressure thrust of the bellows；Caliber:DN50-DN5000)

Working pressure: 0.25-2.5Mpa

Elbow Pressure Balanced Expansion Joint(It consists of two working bellows connected by a working bellows or intermediate pipe , a balancing bellows and elbows or tees, heads, tie rids, end plates and spherical and cone washers, etc., mainly used for absorption Expansion joint that combines axial and lateral and angular displacement can balance the pressure and thrust of the bellows；Caliber:DN50-DN5000)

Working pressure: 0.25-1.6Mpa

In-line Pressure Balanced Expansion Joint( It consists of two working bellows at both ends and a balance bellows in the middle, as well as structural members such as tie rods and end plates, which are mainly used to absorb axial displacement and can balance the pressure and thrust of the bellows expansion joint; Caliber: DN50-DN5000)

Working pressure:0.25-1.6Mpa

Bypass In-line Pressure Balanced Expansion Joint(It consists of two identical bellows and end ring, head, outer tube and other structural parts, which are mainly used to absorb axial displacement and can balance the pressure and the thrust of the bellows expansion joint; Caliber: DN100-DN5000)

Working pressure：0.25-1.6Mpa

Single Axial High Temperature Expansion Joint( The expansion joint is composed of a bellows, a refractory material and a structural part, and is mainly used to absorb the axial displacement and cannot support the expansion thrust of the bellows pressure. Use temperature can reach 1600°C; Caliber: DN1000-DN5000)

Working pressure: 0.01-2.5Mpa

Universal Tied Expansion Joint For Blast Furnace Gas( It consists of two bellows, refractory materials and structural parts connected to the middle pipe. It is mainly used to absorb the combined axial and lateral displacements and cannot withstand the pressure thrust of the bellows expansion joint. Use temperature can reach 1600°C; Caliber: DN1000-DN5000)

Working pressure: 0.01-2.5Mpa

Rectangular Corrugated Expansion Joint(--Rectangular bellows can absorb axial displacement, angular displacement, lateral displacement and displacement made of any combination of them; --The corners of the rectangular bellows are usually rounded, right-angled, double obtuse, and folded. The waveform (CE waveform) has full height and half height. The commonly used materials are weathering steel, austenitic stainless steel, and ordinary carbon steel; --Operating pressure-30~200kpa

This bellow is mainly used for displacement compensation of square pipes. Smoke ducts, fan inlets and outlets, dust collector inlet and outlet pipes, and various exhaust gas pipes are often used.

Use of Expansion joint

Expansion joints for coal fired boilers

ZhongBo is able to offer varying technical standards to suit the technical requirements/maintenance cycle and budget for each location of joint.

the large scale systems necessary for desulphurization of flue gases have created highly demanding technical and environmental requirements for expansion joints. the large sizes and consistent quality require a competent supply partner like ZhongBo.

Sealed for low dust ingress

High dust concentration in coal fired duct systems requires an innovative solution to stop the dust ingressing into the expansion joint. The critical problem is temperature variance and gradients. Dust on the steel parts can cause flash and cool spots, leading to shortening the life of the joint.

By using site utility air, a sealing cushion of air can be created at the internal edge of the joint, eliminating any dust ingress and maximizing life.

ZhongBo manufactures fabric and stainless-steel expansion joints for all applications within a conventional fossil fuel fired steam cycle power station. Expansion Joint Expansion Joints are used in the following locations of plant:

Fabric Joints

• BOFA - Boost over fired air ducts

• FGD-Flue gas desulphurization

• Main boiler ducting

• Boiler penetrations and duct connections

• Ventilation ducts

• Metal Joints

• Steam piping and penetrations

• Oil connections

• High pressure pipework

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