Hi-Vac GDH & GDM Liquid Ring Vacuum Pumps

LIQUID RING VACUUM PUMPS are constantly becoming more important in modern plant production processes. Their design and principle of operation offers many advantages over other types of rotary gas pumps. Liquid Ring Vacuum Pumps can be used on a very large scale for widely divergent applications.

Click to view Hi-Vac Pump tables below:

Capacity Tables GDH Series 50Hz
Capacity Tables GDH Series 60Hz
Capacity Tables GDM Series 50Hz
Capacity Tables GDM Series 60Hz

Operating Principle
The diagram above shows a cross section of the Liquid Ring Vacuum Pump. It operates on the rotary liquid piston principle, the shaft and the impellers being the only moving parts.

The shaft and impeller assembly is mounted eccentrically relative to the pump casing. As the impeller rotates the service liquid ( which is continually supplied to the pump ), is forced outwards by centrifugal force to form a liquid ring revolving concentric to the pump casing.

Because of the eccentric position of the impeller, the liquid ring will move towards and away from the shaft, resulting in a liquid piston action which displaces the air or gases between the spaces of the impeller blades.

As the impeller rotates, the liquid is thrown out by centrifugal force and air is drawn in through the suction port. After the suction port is passed, the service liquid is forced back into the spaces between the impeller blades, gradually compressing the air or gases. When the spaces between the impeller blades reach the discharge point, the liquid ring will force the air compressed between the blades into the discharge port.

Liquid Ring Vacuum Pumps offer the following advantages:

1. High Vacuum. Up to 25mm Hg absolute, and higher (with other service liquid).
2. Long Life and Low Maintenance Cost. The impellers and shaft are the only moving parts. The impellers have no contact with the casing. There are no sliding vanes or valves.
3. Vibration-free and Noiseless Operation. Rugged construction and absence reciprocating parts ensure vibration-free and noiseless operation.
4. Non-pulsation Gas Flow.
5. No Internal Lubrication.
6. Liquid and Vapour Handling. Liquid Ring Vacuum Pumps are capable of handling large quantities of vapour. Small amounts of liquid drawn in from the system will pass through the pump without causing damage.
7. Low Starting Torque.
8. Different Service liquids may be used.
9. Materials of Construction. Pumps can be constructed from a wide range of materials to suit corrosive conditions.
10. Delivery of Absolutely Oil-free Air. When unit is used as a compressor.

The capacities below are based on dry air at 20°c and seal water at 15°c. The barometric pressure is 760mm hg abs. Tolerance 10%

Capacity Tables

GDH Series
50Hz

Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	260 TORR		160 TORR		80 TORR		60 TORR		40 TORR		30 TORR		25 TORR		Service liquid flow rate l/min
Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	Service liquid flow rate l/min
20/2	1,5	2800	32	3/8" BSP	-	-	39	1,35	37	1,3	34	1,3	27	1,3	18	1,3	-	-	5,9
30	3	1450	40	½" BSP	57	2,24	57	2,24	52	2,24	49	2,24	42	2,24	33	2,24	25	2,24	12
60	4	1450	40	½" BSP	108	2,98	108	2,98	105	2,83	100	2,76	84	2,69	72	2,61	54	2,61	14
80	4	1450	40	3/4" BSP	126	3,58	132	3,51	150	3,78	145	3,13	120	2,98	90	2,83	72	2,76	19
100	5,5	1450	40	3/4" BSP	146	4,18	145	4,18	180	3,88	180	3,88	155	3,8	125	3,73	100	3,73	23
150	11	1450	50	1" BSP	270	7,46	290	7,31	280	6,94	270	6,68	220	6,79	190	6,71	165	6,71	32
200	11	1450	50	1" BSP	330	9,33	360	8,95	350	8,21	340	7,83	300	7,53	240	7,53	200	7,46	37
250	11	1450	50	1" BSP	390	10,44	440	10,07	440	9,4	420	9,25	360	8.95	290	8,95	225	8,8	46
300	18,5	1450	80	1¼" BSP	510	14,92	540	14,92	510	14,55	480	14,55	420	14,17	330	14,17	-	-	75
450	30	1450	80	1¼" BSP	720	22,38	780	20,89	750	20,14	690	19,4	510	19,4	390	18,65	-	-	89
500	30	960	100	2" BSP	840	24	900	24	870	22	840	22	780	21	660	21	-	-	96
750	37	960	100	2" BSP	1200	34	1350	34	1320	30	1230	29	1020	28	800	28	-	-	110
950	45	960	100	2" BSP	1320	37	1500	37	1700	34	1620	33	1320	31	1080	30	-	-	120
1200	75	720	150	2½" BSP	1920	58	2100	57	2100	48	1980	46	1680	44	1320	43	-	-	166
1500	75	720	150	2½" BSP	2280	70	2500	69	2650	60	2500	57	2200	55	1740	54	-	-	191
1800	90	720	150	2½" BSP	2630	82	3000	83	3200	72	3100	69	2800	66	2200	64	-	-	232

GDH Series
60Hz

Model GDH	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	160 TORR		110 TORR		80 TORR		60 TORR		40 TORR		30 TORR		25 TORR		Service liquid flow rate l/min
Model GDH	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	Service liquid flow rate l/min
20/2	2,2	3400	32	3/8" BSP	53	1,9	53	1,9	49	1,8	44	1,8	32	1,8	20	1,8	-	-	7,5
30	3	1750	40	½" BSP	69	2,76	68	2,76	64	2,76	56	2,83	45	2,83	34	2,83	25	2,83	15
60	4	1750	40	½" BSP	127	3,65	126	3,65	114	3,6	102	3,5	84	3,43	71	3,43	55	3,36	19
80	5,5	1750	40	3/4" BSP	166	4,85	168	4,4	174	4,4	166	4,4	146	4,33	123	4,26	101	4,18	22
100	7,5	1750	40	3/4" BSP	195	5,97	220	5,74	220	5,7	209	5,67	186	5,59	161	5,55	135	5,52	25
150	11	1750	50	1" BSP	333	10,44	338	10,3	331	10	312	9,84	261	9,7	224	9,55	199	9,55	38
200	15	1750	50	1" BSP	420	12,3	420	11,6	413	11,4	405	11,2	301	11	272	10,6	207	10,4	45
250	15	1750	50	1" BSP	520	14,17	526	13,8	520	13,4	492	13,1	400	13,1	314	13,05	237	12,5	50
300	22	1750	80	1¼" BSP	626	20,8	628	20,8	611	20,5	570	20,1	485	19,9	395	19,76	-	-	80
450	30	1750	80	1¼" BSP	917	28,3	949	27,6	912	27,1	841	26,8	635	26	445	25,4	-	-	95
500	37	1150	100	2" BSP	985	36	994	35	968	34	883	33	765	32	578	32	-	-	110
750	45	1150	100	2" BSP	1334	43	1427	42	1359	41	1249	40	1036	40	824	40	-	-	115
950	75	1150	100	2" BSP	1640	57	1699	56	1690	56	1631	55	1368	51	1113	82	-	-	125
1200	110	880	150	2½" BSP	2294	90	2345	90	2251	90	2090	88	1716	86	1359	82	-	-	190
1500	110	880	150	2½" BSP	2701	105	2940	107	2786	106	2549	105	2081	100	1648	97	-	-	220
1800	132	880	150	2½" BSP	3500	125	3636	126	3568	120	3347	116	2735	113	1954	110	-	-	250

GDM Series
50Hz

Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	660 TORR		560 TORR		460 TORR		350 TORR		250 TORR		150 TORR		Service liquid flow rate l/min
Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	Service liquid flow rate l/min
20/2	1.5	2800	32	3/8" BSP	34	0.6	35	0.8	35	0.9	32	1.1	28	1,2	19	1,3	5,9
30	2.2	1450	38	1/2" BSP	54	0.75	54	0.97	54	1.19	54	1.34	52	1,49	42	1,49	7
60	3	1450	38	1/2" BSP	105	1.72	105	2.28	105	2.39	105	2.54	105	2,61	88	2,69	12
85	4	1450	38	1/2" BSP	150	2.61	150	2.98	150	3.21	150	3.51	145	3.88	130	4	16
100	5.5	1450	50	1" BSP	170	3.21	160	3.73	160	4.1	160	4.4	160	4,85	152	5,22	20
150	7.5	1450	50	1" BSP	255	4.85	255	5.37	255	5.97	255	6.42	245	6,86	220	7,46	25
200	11	1450	64	1" BSP	340	5.97	340	6.71	340	7.46	340	8.06	330	8,65	300	9,33	30
240	15	1450	64	1" BSP	410	7.46	410	8.21	410	8.95	410	9.7	400	10,44	360	11,19	40
300	18.5	1450	80	1¼" BSP	510	8.95	510	10.82	510	12.31	510	13.65	490	14,92	440	16,04	50
450	22	1450	100	1¼" BSP	750	15	750	16	750	17	750	18	730	19	660	20	62
580	30	1450	100	2x1¼"BSP	1000	20	1000	22	1000	24	1000	27	930	28	720	30	70
700	37	960	127	2" BSP	1250	28	1250	29	1250	30	1250	31	1200	31	1100	31	90
900	45	960	127	2" BSP	1550	36	1550	37	1550	39	1550	40	1500	41	1300	41	105
1200	75	720	203	2½" BSP	2000	31	2000	37	2000	43	2000	49	2000	54	1800	58	150
1500	75	720	203	2½" BSP	2600	46	2600	51	2600	56	2600	63	2500	67	2200	71	175
1800	90	720	203	2½" BSP	3150	55	3150	61	3150	69	3150	76	3050	82	2600	87	200
2200	110	720	203	2x2½"BSP	3700	63	3700	72	3700	81	3700	88	3600	95	3300	100	250

GDM Series
60Hz

Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	660 TORR		560 TORR		460 TORR		360 TORR		260 TORR		160 TORR		Service liquid flow rate l/min
Model GDM	Motor kW	Speed rev/ min	Flange conn mm	Service liquid conn	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	m3/h	kW	Service liquid flow rate l/min
20/2	2,2	3400	32	3/8" BSP	50	1,0	57	1,2	58	1,4	58	1,6	55	1,7	42	1,8	5,8
30	2,2	1740	38	1/2" BSP	73	1,4	73	1,5	73	1,6	70	1,7	70	1,9	56	1,9	9
60	4	1740	38	1/2" BSP	140	2,4	140	2,6	140	2,8	140	3,0	136	3,1	114	3,2	15
85	5,5	1740	38	1/2" BSP	197	3,4	197	3,7	197	4,0	197	4,3	190	4,4	173	4,5	19
100	7,5	1740	50	1" BSP	210	4,5	212	5,0	218	5,6	220	6,2	218	6,5	200	6,7	26
150	11	1740	50	1" BSP	315	6,8	318	7,1	322	7,9	322	8,6	317	9,1	274	9,5	32
200	15	1740	64	1" BSP	425	9,0	425	9,3	425	10,2	425	11,0	416	11,8	348	12,4	37
240	18,5	1740	64	1" BSP	470	11,12	480	11,6	490	12,7	480	13,7	460	14,7	405	15,5	48
300	22	1740	80	1¼" BSP	625	16	625	16,5	625	17	625	17,5	580	18	440	19	59
450	30	1740	100	1¼" BSP	940	22	940	23	940	25	940	26	910	27	800	28	75
580	45	1740	100	2x¼ BSP	1200	30	1200	31	1200	32	1200	33	1150	34	870	36	100
700	45	1150	127	2" BSP	1400	40	1400	40	1400	41	1380	42	1350	43	1150	43	130
900	75	1150	127	2" BSP	1800	52	1800	54	1800	55	1800	56	1800	57	1485	57	150
1200	90	880	203	2½" BSP	2400	57	2400	65	2400	72	2400	77	2295	84	2040	87	220
1500	110	880	203	2½" BSP	2755	71	2755	81	2755	91	2755	98	2700	102	2395	107	250
1800	150	880	203	2½" BSP	3300	99	3300	104	3300	111	3300	118	3160	125	2805	131	300
2200	185	880	203	2x2½" BSP	4400	108	4400	120	4400	134	4400	147	4320	159	3750	164	370

Hi-Vac GDH & GDM Liquid Ring Vacuum Pumps

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