model	series n	flow Q		Water pump head H m	rotational speed n r/min	motor power Kw	Net Positive Supplement m	Inlet and outlet diameter
		m3/h	l/s
JGGC0.6	2	0.3 0.6 0.8	0.08 0.16 0.22	17 16 14.6	2900	0.37	2	DN25
	3	0.3 0.6 0.8	0.08 0.16 0.22	25.5 24 21.9
	4	0.3 0.6 0.8	0.08 0.16 0.22	34 32 29.2		0.55
	5	0.3 0.6 0.8	0.08 0.16 0.22	42.5 40 36.5
	6	0.3 0.6 0.8	0.08 0.16 0.22	51 48 43.8		0.75
	7	0.3 0.6 0.8	0.08 0.16 0.22	59.5 56 51.1
	8	0.3 0.6 0.8	0.08 0.16 0.22	68 64 58.4
	9	0.3 0.6 0.8	0.08 0.16 0.22	76.5 72 65.7		1.1
JGGC0.6	10	0.3 0.6 0.8	0.08 0.16 0.22	85 80 73	2900	1.1	2	DN25
	11	0.3 0.6 0.8	0.08 0.16 0.22	93.5 88 80.3
	12	0.3 0.6 0.8	0.08 0.16 0.22	102 96 87.6
	13	0.3 0.6 0.8	0.08 0.16 0.22	110.5 104 94.9
	14	0.3 0.6 0.8	0.08 0.16 0.22	119 112 102.2		1.5
	15	0.3 0.6 0.8	0.08 0.16 0.22	127.5 120 109.5
	16	0.3 0.6 0.8	0.08 0.16 0.22	136 128 116.8
.	17	0.3 0.6 0.8	0.08 0.16 0.22	144.5 135 124.1	.	.	.	.
	18	0.3 0.6 0.8	0.08 0.16 0.22	153 144 131.4
	19	0.3 0.6 0.8	0.08 0.16 0.22	161.5 152 138.7		2.2
	20	0.3 0.6 0.8	0.08 0.16 0.22	170 160 146
	21	0.3 0.6 0.8	0.08 0.16 0.22	178 168 153.3
	22	0.3 0.6 0.8	0.08 0.16 0.22	187 176 160.6
JGGC2.4-5	2	1 2 2.4	0.28 0.56 0.67	18 17 16		0.37		round flange DN32 oval flange G1/4”
	3	1 2 2.4	0.28 0.56 0.67	27 25.5 24		0.55
JGGC2.4-5	4	1 2 2.4	0.28 0.56 0.67	36 34 32	2900	0.75	2	round flange DN32 oval flange G1/4”
	5	1 2 2.4	0.28 0.56 0.67	45 42.5 40		1.1
	6	1 2 2.4	0.28 0.56 0.67	54 51 48		1.5
	7	1 2 2.4	0.28 0.56 0.67	63 59.5 56
	8	1 2 2.4	0.28 0.56 0.67	72 68 64
	9	1 2 2.4	0.28 0.56 0.67	81 76.5 72
	10	1 2 2.4	0.28 0.56 0.67	90 85 80		1.5
.	11	1 2 2.4	0.28 0.56 0.67	99 93.5 88	.	.	.	.
	12	1 2 2.4	0.28 0.56 0.67	108 102 96		2.2
	13	1 2 2.4	0.28 0.56 0.67	117 110.5 104
	14	1 2 2.4	0.28 0.56 0.67	126 119 112
	15	1 2 2.4	0.28 0.56 0.67	135 127.5 120
	16	1 2 2.4	0.28 0.56 0.67	144 136 128		3.0
	17	1 2 2.4	0.28 0.56 0.67	153 144.5 136
	18	1 2 2.4	0.28 0.56 0.67	162 153 144
model	series n	flow Q		Water pump head H m	rotational speed n r/min	motor power Kw	Net Positive Supplement m	Inlet and outlet diameter
		m3/h	l/s
JGGC2.4-5	19	1 2 2.4	0.28 0.56 0.67	171 161.5 152	2900	3.0	2	round flange DN32 oval flange G1/4”
	20	1 2 2.4	0.28 0.56 0.67	180 170 160
	21	1 2 2.4	0.28 0.56 0.67	189 178.5 168
	22	1 2 2.4	0.28 0.56 0.67	198 187 176		4.0
JGGC4	2	3 4 4.8	0.83 1.11 1.33	17 16 15		0.55		round flange DN32 oval flange G1 1/2”
	3	3 4 4.8	0.83 1.11 1.33	25.5 24.0 22.5		0.75
	4	3 4 4.8	0.83 1.11 1.33	34 32 30		1.1
.	5	3 4 4.8	0.83 1.11 1.33	42.5 40.0 37.5	.	.	.	.
	6	3 4 4.8	0.83 1.11 1.33	51 48 45		1.5
	7	3 4 4.8	0.83 1.11 1.33	59.5 56.0 52.5
	8	3 4 4.8	0.83 1.11 1.33	68 64 60
	9	3 4 4.8	0.83 1.11 1.33	76.5 72.0 67.5		2.2
	10	3 4 4.8	0.83 1.11 1.33	85 80 75
	11	3 4 4.8	0.83 1.11 1.33	93.5 88.0 82.5
	12	3 4 4.8	0.83 1.11 1.33	102 96 90		3.0
	13	3 4 4.8	0.83 1.11 1.33	110 104 97
m3/h	l/s
JGGC4	14	3 4 4.8	0.83 1.11 1.33	119 112 105	2900	3.0	2	.
	15	3 4 4.8	0.83 1.11 1.33	127 120 112				round flange DN32 oval flange G1 1/2”
	16	3 4 4.8	0.83 1.11 1.33	136 128 120
	17	3 4 4.8	0.83 1.11 1.33	144 136 127		4.0
	18	3 4 4.8	0.83 1.11 1.33	153 144 135
	19	3 4 4.8	0.83 1.11 1.33	161 152 142
	20	3 4 4.8	0.83 1.11 1.33	170 160 150
.	21	3 4 4.8	0.83 1.11 1.33	178 168 157	.	.	.	.
	22	3 4 4.8	0.83 1.11 1.33	187 176 165		5.5
JGGC8-5	2	6 8 10	1.67 2.22 2.78	18 16 13.6		1.1		round flange DN40 oval flange G2”
	3	6 8 10	1.67 2.22 2.78	27 24 20.4		1.5
	4	6 8 10	1.67 2.22 2.78	36 32 27.2		2.2
	5	6 8 10	1.67 2.22 2.78	45 40 34
	6	6 8 10	1.67 2.22 2.78	54 48 40.8
	7	6 8 10	1.67 2.22 2.78	63 56 47.6
	8	6 8 10	1.67 2.22 2.78	72 64 54.4		3.0
JGGC8-5	9	6 8 10	1.67 2.22 2.78	81 72 61.2	2900	3.0	2	round flange DN40 oval flange G2”
	10	6 8 10	1.67 2.22 2.78	90 80 68		4.0
	11	6 8 10	1.67 2.22 2.78	99 88 74.8
	12	6 8 10	1.67 2.22 2.78	108 96 81.6
	13	6 8 10	1.67 2.22 2.78	117 104 88.4		5.5
	14	6 8 10	1.67 2.22 2.78	126 112 95.2
	15	6 8 10	1.67 2.22 2.78	135 120 102
	16	6 8 10	1.67 2.22 2.78	144 128 109
.	17	6 8 10	1.67 2.22 2.78	153 136 115	.	.	.	.
	18	6 8 10	1.67 2.22 2.78	162 144 122		7.5
	19	6 8 10	1.67 2.22 2.78	171 152 129
	20	6 8 10	1.67 2.22 2.78	180 160 136
	21	6 8 10	1.67 2.22 2.78	189 168 143
	22	6 8 10	1.67 2.22 2.78	198 176 150
JGGC10	2	8 10 12.5	2.22 2.78 3.47	24 22 19		1.5
	3	8 10 12.5	2.22 2.78 3.47	36 33 28.5		2.2
	4	8 10 12.5	2.22 2.78 3.47	48 44 38		3
	5	8 10 12.5	2.22 2.78 3.47	60 55 47.5
JGGC10	6	8 10 12.5	2.22 2.78 3.47	72 66 57	2900	4	2	round flange DN40 oval flange G2”
	7	8 10 12.5	2.22 2.78 3.47	84 77 66.5
	8	8 10 12.5	2.22 2.78 3.47	96 88 76		5.5
	9	8 10 12.5	2.22 2.78 3.47	108 99 85.5
	10	8 10 12.5	2.22 2.78 3.47	120 110 95		7.5
	11	8 10 12.5	2.22 2.78 3.47	132 121 104.5
	12	8 10 12.5	2.22 2.78 3.47	144 132 114
	13	8 10 12.5	2.22 2.78 3.47	156 143 123.5
.	14	8 10 12.5	2.22 2.78 3.47	168 154 133	.	11	.	.
	15	8 10 12.5	2.22 2.78 3.47	180 165 142.5
	16	8 10 12.5	2.22 2.78 3.47	192 176 152
	17	8 10 12.5	2.22 2.78 3.47	204 187 161.5
JGGC12.5	2	9 12.5 16	2.50 3.47 4.44	32 30 27	2950	2.2	2.1 2.5 2.8	DN50
	3	9 12.5 16	2.50 3.47 4.44	48 45 40		3.0	2.1 2.5 2.8
	4	9 12.5 16	2.50 3.47 4.44	64 60 54		4.0	2.1 2.5 2.8
	5	9 12.5 16	2.50 3.47 4.44	80 75 67		5.5	2.1 2.5 2.8
	6	9 12.5 16	2.50 3.47 4.44	96 90 80		7.5	2.1 2.5 2.8
	7	9 12.5 16	2.50 3.47 4.44	112 105 94			2.1 2.5 2.8
JGGC12.5	8	9 12.5 16	2.50 3.47 4.44	128 120 107	2950	11.0	2.1 2.5 2.8	DN50
	9	9 12.5 16	2.50 3.47 4.44	144 135 121	2900		2.1 2.5 2.8
	10	9 12.5 16	2.50 3.47 4.44	160 150 134			2.1 2.5 2.8
	11	9 12.5 16	2.50 3.47 4.44	176 165 147		15	2.1 2.5 2.8
	12	9 12.5 16	2.50 3.47 4.44	192 180 161			2.1 2.5 2.8
	13	9 12.5 16	2.50 3.47 4.44	208 195 174			2.1 2.5 2.8
	14	9 12.5 16	2.50 3.47 4.44	224 210 187			2.1 2.5 2.8
JGGC18	2	12 18 24	3.33 5.0 6.67	36 32 26	2950	3.0	2.3 2.8 3.6	DN65
	3	12 18 24	3.33 5.0 6.67	54 48 39	.	5.5	2.3 2.8 3.6	.
	4	12 18 24	3.33 5.0 6.67	72 64 52		7.5	2.3 2.8 3.6
	5	12 18 24	3.33 5.0 6.67	90 80 65			2.3 2.8 3.6
	6	12 18 24	3.33 5.0 6.67	108 96 78		11.0	2.3 2.8 3.6
	7	12 18 24	3.33 5.0 6.67	126 112 91			2.3 2.8 3.6
	8	12 18 24	3.33 5.0 6.67	144 128 104		15.0	2.3 2.8 3.6
	9	12 18 24	3.33 5.0 6.67	162 144 117	2900		2.3 2.8 3.6
	10	12 18 24	3.33 5.0 6.67	180 160 130		18.5	2.3 2.8 3.6
	11	12 18 24	3.33 5.0 6.67	198 176 143			2.3 2.8 3.6
	12	12 18 24	3.33 5.0 6.67	216 192 156			2.3 2.8 3.6
JGGC18	13	12 18 24	3.33 5.0 6.67	234 208 169	2900	22.0	2.3 2.8 3.6	DN65
	14	12 18 24	3.33 5.0 6.67	252 224 182			2.3 2.8 3.6
JGGC30	2	25 30 36	6.94 8.33 10	32 30 26	2950	4.0	3 3.2 3.5
	3	25 30 36	6.94 8.33 10	48 45 39		7.5	3 3.2 3.5
	4	25 30 36	6.94 8.33 10	64 60 52			3 3.2 3.5
	5	25 30 36	6.94 8.33 10	80 75 65		11	3 3.2 3.5
	6	25 30 36	6.94 8.33 10	96 90 78		15	3 3.2 3.5
	7	25 30 36	6.94 8.33 10	112 105 91			3 3.2 3.5
.	8	25 30 36	6.94 8.33 10	128 120 104	.	18.5	3 3.2 3.5	.
	9	25 30 36	6.94 8.33 10	144 135 117			3 3.2 3.5
	10	25 30 36	6.94 8.33 10	160 150 130		22	3 3.2 3.5
	11	25 30 36	6.94 8.33 10	176 165 143			3 3.2 3.5
	12	25 30 36	6.94 8.33 10	192 180 156		30	3 3.2 3.5
	13	25 30 36	6.94 8.33 10	208 195 169			3 3.2 3.5
	14	25 30 36	6.94 8.33 10	224 210 182			3 3.2 3.5
JGGC42	2	36 42 50	10 11.7 13.8	34 32 27	2950	7.5	3 3.4 3.9	DN80
	3	36 42 50	10 11.7 13.8	51 48 40.5		11	3 3.4 3.9
	4	36 42 50	10 11.7 13.8	68 64 54			3 3.4 3.9
JGGC42	5	36 42 50	10 11.7 13.8	85 80 67.5	2950	15	3 3.4 3.9	DN80
	6	36 42 50	10 11.7 13.8	102 96 81		18.5	3 3.4 3.9
	7	36 42 50	10 11.7 13.8	119 112 94.5		22	3 3.4 3.9
	8	36 42 50	10 11.7 13.8	136 128 108		30	3 3.4 3.9
	9	36 42 50	10 11.7 13.8	153 144 121.5			3 3.4 3.9
	10	36 42 50	10 11.7 13.8	170 160 135			3 3.4 3.9
	11	36 42 50	10 11.7 13.8	187 176 148.5		37	3 3.4 3.9
	12	36 42 50	10 11.7 13.8	204 192 162			3 3.4 3.9
JGGC60	1	50 60 72	13.8 16.7 20	19.3 17 14	2950	4	3 3.2 3.5	DN100
	2	50 60 72	13.8 16.7 20	38.6 34 28		11	3 3.2 3.5
	3	50 60 72	13.8 16.7 20	58 51 42		15	3 3.2 3.5
	4	50 60 72	13.8 16.7 20	77 68 56		18.5	3 3.2 3.5
	5	50 60 72	13.8 16.7 20	96.5 85 70		22	3 3.2 3.5
	6	50 60 72	13.8 16.7 20	116 102 84		30	3 3.2 3.5
	7	50 60 72	13.8 16.7 20	125 119 98			3 3.2 3.5
	8	50 60 72	13.8 16.7 20	144 136 110		37	3 3.2 3.5
	9	50 60 72	13.8 16.7 20	163 153 124			3 3.2 3.5
	10	50 60 72	13.8 16.7 20	182 170 140		45	3 3.2 3.5
JGGC90	1	72 90 108	20 25 30	20 18 14	2950	7.5	3.6 4.1 4.3	DN100
	2	72 90 108	20 25 30	40 36 28		15	3.6 4.1 4.3
	3	72 90 108	20 25 30	60 54 42		22	3.6 4.1 4.3
	4	72 90 108	20 25 30	80 72 56		30	3.6 4.1 4.3
	5	72 90 108	20 25 30	100 90 70		37	3.6 4.1 4.3
	6	72 90 108	20 25 30	120 108 84		45	3.6 4.1 4.3
JGGC72	2	50.4 72 90	14 20 25	45 40 36	1480	15.0	2.5 3.0 4.0	suction port DN100 Spit out DN80
	3	50.4 72 90	14 20 25	67.5 60 54		22.0	2.5 3.0 4.0
.	4	50.4 72 90	14 20 25	90 80 72	.	30.0	2.5 3.0 4.0	.
	5	50.4 72 90	14 20 25	112.5 100 90		37.0	2.5 3.0 4.0
	6	50.4 72 90	14 20 25	135 120 106		45.0	2.5 3.0 4.0
	7	50.4 72 90	14 20 25	157.5 140 126		55.0	2.5 3.0 4.0
	8	50.4 72 90	14 20 25	180 160 144			2.5 3.0 4.0
JGGC100	2	72 100 126	20 27.8 35	43 40 34	1480	18.5	2.5 3.0 4.0	suction port DN100 Spit out DN80
	3	72 100 126	20 27.8 35	65 60 51		30.0	2.5 3.0 4.0
	4	72 100 126	20 27.8 35	86 80 68		37.0	2.5 3.0 4.0
	5	72 100 126	20 27.8 35	108 100 85		45.0	2.5 3.0 4.0
	6	72 100 126	20 27.8 35	129.5 120 102		55.0	2.5 3.0 4.0
JGGC150	1	108 150 180	30 41.6 50	23 20 17	1480	15.0	3 3.5 4	suction port DN150 Spit out DN125
	2	108 150 180	30 41.6 50	46 40 34		30.0	3 3.5 4
	3	108 150 180	30 41.6 50	69 60 51		37.0	3 3.5 4
	4	108 150 180	30 41.6 50	92 80 68		55.0	3 3.5 4
	5	108 150 180	30 41.6 50	115 100 85		75.0	3 3.5 4
JGGC200	1	120 200 240	33.3 55.6 66.7	22.5 20 17.5	1480	18.5	3 3.5 4.1	suction port DN150 Spit out DN125
	2	120 200 240	33.3 55.6 66.7	45 40 35		37.0	3 3.5 4.1
	3	120 200 240	33.3 55.6 66.7	67.5 60 52		55.0	3 3.5 4.1
.	4	120 200 240	33.3 55.6 66.7	90 80 70	.	75.0	3 3.5 4.1	.
JGGC-G8	5	6 8 10	1.67 2.22 2.78	180 175 160	2950	15	2.1	DN65
	6	6 8 10	1.67 2.22 2.78	216 210 192
	7	6 8 10	1.67 2.22 2.78	252 245 224		18.5
	8	6 8 10	1.67 2.22 2.78	288 280 256		22
	9	6 8 10	1.67 2.22 2.78	324 315 288
	10	6 8 10	1.67 2.22 2.78	360 350 320		30
JGGC-G13	5	11 13 15	3.06 3.61 4.17	180 175 165	2950	18.5	2.2	DN65
	6	11 13 15	3.06 3.61 4.17	216 210 198		22
	7	11 13 15	3.06 3.61 4.17	252 245 231
JGGC-G13	8	11 13 15	3.06 3.61 4.17	288 280 264	2950	30	2.2	DN65
	9	11 13 15	3.06 3.61 4.17	324 315 297
	10	11 13 15	3.06 3.61 4.17	360 350 330		37
JGGC-G20	5	16 20 24	4.44 5.56 6.67	185 175 160	2950	22	2.5	suction port DN80 Spit out DN65
	6	16 20 24	4.44 5.56 6.67	222 210 192		30
	7	16 20 24	4.44 5.56 6.67	259 245 224
	8	16 20 24	4.44 5.56 6.67	296 280 256		37
	9	16 20 24	4.44 5.56 6.67	333 315 288
.	10	16 20 24	4.44 5.56 6.67	370 350 320	.	45	.	.
JGGC-G25	5	20 25 30	5.56 6.94 8.33	190 175 160	2950	22	3	suction port DN80 Spit out DN65
	6	20 25 30	5.56 6.94 8.33	228 210 192		30
	7	20 25 30	5.56 6.94 8.33	266 245 224		37
	8	20 25 30	5.56 6.94 8.33	304 280 256
	9	20 25 30	5.56 6.94 8.33	342 315 288		45
	10	20 25 30	5.56 6.94 8.33	380 350 320
JGGC-G36	5	30 36 42	8.33 10.00 11.67	160 150 125	2950	30	3	suction port DN80 Spit out DN65
	6	30 36 42	8.33 10.00 11.67	192 180 150
	7	30 36 42	8.33 10.00 11.67	224 210 175		37
JGGC-G36	8	30 36 42	8.33 10.00 11.67	256 240 200	2950	45	3	suction port DN80 Spit out DN65
	9	30 36 42	8.33 10.00 11.67	288 27 225		55
JGGC-G42	4	35 42 50	9.72 11.67 13.89	192 180 160	2950	37	3	suction port DN80 Spit out DN65
	5	35 42 50	9.72 11.67 13.89	240 225 200		55
	6	35 42 50	9.72 11.67 13.89	288 270 240		75
	7	35 42 50	9.72 11.67 13.89	336 315 280
	8	35 42 50	9.72 11.67 13.89	384 360 320
	9	35 42 50	9.72 11.67 13.89	432 405 360		90
.	10	35 42 50	9.72 11.67 13.89	480 450 400	.	110	.	.
	11	35 42 50	9.72 11.67 13.89	528 495 440
JGGC-G78	4	65 78 92	18.06 21.67 25.56	192 180 152	2950	75	4	suction port DN100 Spit out DN80
	5	65 78 92	18.06 21.67 25.56	240 225 190
	6	65 78 92	18.06 21.67 25.56	288 270 228		90
	7	65 78 92	18.06 21.67 25.56	336 315 266		110
	8	65 78 92	18.06 21.67 25.56	384 360 304		132
	9	65 78 92	18.06 21.67 25.56	432 405 342		160
	10	65 78 92	18.06 21.67 25.56	480 450 380

How to choose a JGGC vertical multistage centrifugal pump?

When selecting a JGGC vertical multistage centrifugal pump (essentially a series/manufacturer model of vertical multistage centrifugal pumps), simply follow the selection path: “Medium—Flow Rate Q—Head H—NPSH/Installation—Material and Seal—Motor and Control”. Below is a practical selection guide and common pitfalls.

1) First, confirm the medium and application scenario (determine material, seal, and suitability of a multistage pump).

The following needs to be clarified:

Medium: Clean water/softened water/cooling water/boiler feedwater/mildly corrosive liquid/containing a small amount of gas?

Temperature (minimum/maximum)
Does it contain solid particles, silt, or fibers? Vertical multistage pumps are generally not suitable for sandy/sewage (multiple impeller stages, small clearances, rapid wear, and prone to jamming).

1) Variable frequency constant pressure (water supply, booster) or constant speed (boiler feedwater, etc.) required?

2) Determine the flow rate Q (m³/h) and operating range.
Give: Common flow rate, maximum flow rate, minimum flow rate.
When selecting a pump, ensure the common flow point falls within 0.8～1.1×BEP of the pump curve for greater stability and energy saving.
If your system has a large number of low-flow operations, consider:
The pump’s minimum continuous stable flow rate (provided by the manufacturer).
Whether bypass backflow/low flow protection is needed.

3) Calculate the total head H (m) – This is the easiest to calculate incorrectly.
The total head should typically include:

Static head: The height difference (or pressure difference) from the suction liquid surface to the highest point of water use.
Terminal pressure requirement: For example, 0.25MPa ≈ 25m.
Pipeline losses: Frictional + local (valves, elbows, check valves, filters, flow meters).
Equipment pressure drop: Heat exchangers, softeners, boilers, economizers, etc.
Maintenance: Commonly used. 5-10% Convert pressure to head:

1 MPa ≈ 100 m water column; 0.1 MPa ≈ 10 m.

4) Check NPSH (Net Positive Suction Head) and Installation Method
Vertical multistage pumps are commonly used for pressurization and water replenishment, many operating under “pressurized suction” or “backflow,” making them relatively less prone to cavitation. However, if drawing from a water tank, the following should be considered:

Liquid level to pump inlet height (suction or backflow)

Suction pipe losses (small pipe diameter/clogged filter is the most critical)
High water temperature (hot water, boiler feedwater) significantly increases the risk of cavitation.
Request the manufacturer to provide the NPSHr under this operating condition. Your system must meet NPSHa ≥ NPSHr + 0.5-1 m (empirical margin).

5) Use “Number of Stages/Impeller Combination” to Meet Head Requirements: Don’t Just Look at “How Many Stages”

JGGC multistage pumps typically achieve different heads through different combinations of stages/impeller diameters. What you need to do is:

Find the curve that satisfies H (corresponding to a certain stage) under the target flow rate Q.

Simultaneously check the efficiency and shaft power at that point to avoid selecting the end of the curve (low efficiency, large vibration, easy overload).

6) Material selection (especially stainless steel grade and chloride ion resistance)

Common selection logic:

Clean water/general domestic water: 304 stainless steel pump body/impeller is common.

High chloride ion content (groundwater, tap water at the seaside, cooling tower makeup water, etc.): Prioritize 316/316L or higher grades, otherwise the risk of pitting corrosion is high.

High temperature feedwater: Pay attention to shaft seal, O-ring, and temperature resistance rating.

For mildly corrosive media: The media composition must be provided so that the manufacturer can select materials according to the corrosion table.

7) Sealing and Pressure Rating

Commonly Used: Mechanical seals (silicon carbide/graphite, or silicon carbide/silicon carbide, etc., paired)
High medium temperature, high pressure, frequent start-stop: Higher grade seals are recommended; flushing/cooling solutions may be necessary.
Verify the pump’s maximum operating pressure/casing pressure resistance (multi-stage pumps may have very high outlet pressures; do not only consider the head).

8) Motor Selection and Control (Constant Power/Variable Frequency)
Select motor power based on the shaft power curve under maximum operating conditions × (1.1~1.2 margin).
Constant water supply pressure: Prioritize variable frequency + pressure sensor, and set:
Minimum flow protection corresponding to the minimum frequency
Overpressure, underpressure, and water shortage (dry running) protection
Verify power supply: 380V/50Hz, etc., protection level IP55, insulation class F, explosion-proof (only select if required)

9) On-site equipment recommendations (to improve stability and reduce failures):

Suction side: Short and straight pipe with sufficient diameter; the filter should be washable and pressure loss controllable.

Outlet side: Check valve + shut-off valve; for variable frequency systems, slow-closing check valve/water hammer protection is recommended.

Required instruments: Inlet pressure/vacuum gauge, outlet pressure gauge, flow rate (optional), temperature (hot water). Water shortage/low liquid level interlock is a lifesaver for multistage pumps (dry running quickly damages the seals).