Name: IS Clear Water Pumps
Brand: Shijiazhuang First Pump Factory Co., Ltd.

IS Clear Water Pumps

The IS Series is a horizontal, single-stage, single-suction end-suction centrifugal pump designed for clean water and liquids with similar physical and chemical properties. It is commonly used in industrial cooling and circulation systems, municipal water supply, agricultural irrigation, drainage and general water transfer.

Its back pull-out construction allows the rotating assembly to be removed without disconnecting the pump casing from the suction and discharge pipelines. Available model configurations support 1450 or 2900 rpm operation, multiple impeller diameters, and packing or mechanical seal options. Final pump selection should be based on the required flow, total head, liquid temperature, NPSH conditions, material and motor specification.

Key Benefits of IS Clear Water Pumps

Reduced Maintenance Downtime: Quick-access rear pull-out design streamlines inspection and component replacement.
Performance Flexibility: Broad operational range allows fine-tuning via speed and impeller adjustments.
Durable & Interoperable: ISO-aligned manufacturing guarantees part consistency and extended service life under clean water conditions.

Standards & Compatibility of IS Clear Water Pumps

Manufactured in full compliance with GB5662-85 (China National Standard) and engineered to meet ISO 2858 specifications, the IS pump ensures dimensional interchangeability and operational reliability for both domestic and international markets.

Construction

Construction of Is Clear Water Pumps

Figure 1

1	Casing	2	Casing Cover	3	Impeller	4	Shaft	5	Wear Ring	6	Impeller Nut
7	Brake Gasket	8	Shaft Sleeve	9	Gland	10	Lantern Ring	11	Packing	12	Bearing Bracket

IS Clear Water Pumps

IS Type Pump Construction Description

1. Design Standard & Main Components

Design Standard: Performance and dimensions are designed in accordance with the International Standard ISO 2858.
Main Components: Casing (1), Casing Cover (2), Impeller (3), Shaft (4), Wear Ring (5), Shaft Sleeve (8), Bearing Bracket (12), (See Fig 1)

2. Structural Design Features

Back Pull-Out Design: The pump is divided into the casing and the casing cover at the back face of the impeller. This structure facilitates easy maintenance.
Volute Casing: The pump volute is formed by the casing and the casing cover together.
Rotating Element: Consists of the impeller, shaft, and rolling bearings.
Support Method: The rotating element is supported by rolling bearings mounted in a hanging-style bearing bracket. These bearings carry both the radial and axial thrust.

3. Maintenance Advantages

For inspection and maintenance, only the intermediate connector between the pump and motor couplings needs to be dismantled.
The entire rotating assembly can be completely withdrawn without disturbing the main casing, suction and discharge pipelines, or the motor.

4. Axial Thrust Balancing

Primary Method: For most pump models, axial thrust is balanced by having wear rings on both the front and back of the impeller, along with balance holes drilled in the impeller's back shroud.
Special Case: For some pumps where the inherent axial thrust is minimal, no back wear ring or balance holes are provided on the impeller.

Core Features of IS Clear Water Pumps

Adaptable Performance Range

With 29 base models supporting up to 153 performance variants, the IS series enables flexible operation through:

Dual-speed motor options (1450 / 2900 rpm)
Customizable impeller diameters via systematic trimming (A, B, C variants)

Maintenance-Optimized Construction

Rear Pull-Out Design: Facilitates complete rotor assembly removal without disturbing the casing or connected piping—ideal for rapid service and part replacement.
Balanced Rotor System: Engineered with front and rear sealing rings and impeller balance holes to counteract axial thrust, enhancing operational stability.

Advanced Sealing & Protection

Multiple Sealing Choices: Options include soft packing, mechanical seals, or rubber oil seals to suit varying operational and environmental requirements.
Integrated Anti-Leak Design: A pressurized lantern ring system—activated for impellers with balance holes—ensures effective shaft sealing and prevents air ingress.
Shaft Integrity: A replaceable shaft sleeve, paired with a static O-ring seal, safeguards the shaft against wear and avoids leakage along dynamic interfaces.

Technical Specification & Identification of IS Clear Water Pumps

Sample Model: IS50-32-125 A

IS: Series identifier for single-suction centrifugal pumps

50: Inlet diameter (mm)

32: Outlet diameter (mm)

125: Nominal impeller diameter (mm)

A: Designates impeller trim level for customized performance

Design duty and features: (at design point)

Speed n: 2900rpm and 1450rpm
Inlet diameter: 50 to 200mm
Capacity Q: 6.3to 400m3 /h
Head H: 5 to 125m

Typical Use Cases

Industrial process water circulation and cooling loops
Urban and residential water supply and drainage infrastructure
Agricultural irrigation and field dewatering systems

Probable Fault and Their Remedy

SYMPTOM	PROBABLE FAULT	REMEDY
(1) Pump loses liquid. Indicating needle of pressure gauge and vacuum meter jumps severely.	Pump not fully primed. Air leaks in pipe line or gauge.	Stop pump. Reprime and repair leak.
(2) Pump loses liquid. Vacuum meter is at hard vacuum state.	Foot valve not open or blocked. Resistance force too high. Suction line too high.	Adjust or renew foot valve. Clear or renew suction pipe. Reduce height.
(3) Pressure exists at pressure gauge but no discharge from pipe.	Resistance force too high, impeller rotating in wrong direction. Impeller blocked.	Check pipe and motor. Shorten pipe and clean impeller.
(4) Quantity underestimated.	Blockage in pump. Rings worn excessively.	Clean pump and pipe, Renew ring.
(5) Excessive power consumption.	Stuffing boxes too tight Stuffing boxes overheating. Pump delivering more than its rated quantity because of impeller damaged for wear.	Tight stuffing boxes or reassemble stuffing boxes as necessary. Renew impeller. Increase resistance force in discharge pipe to reduce capacity.
(6) Noise not good witin pump. Loss of suction.	Flow quantity too large. Resistance force too high in suction line. Height too High and air leak at inlet of suction pipe. Temperature too high.	Increase resistance force in Delivery pipe to reduce flow quantity. Check resistance force in suction pipe. Check foot valve Reduce suction lift. Make good if any leaks. Reduce temperature of liquid.
(7) Bearing overheating	No oil. Pump and driving unit out of alignment.	Fill with oil. Realign pump and driving unit.
(8) Pump excessive vibration.	Pump and driving unit out of alignment. Pump shaft bent.	Realign pump and driving unit. Straighten shaft.

Built to deliver dependable performance with minimal lifecycle cost, the IS Clean Water Centrifugal Pump series stands as a practical and economical solution for a wide array of water handling requirements.

Performance Parameters of IS Clear Water Pumps

S/N	Model	Capacity	Head m	Speed r/min	Power Kw
S/N	Model	m3 /h	Head m	Speed r/min	Power Kw
1	IS50-32-125	12.5	20	2900	2.2
2	IS50-32-125A	11.2	16	2900	1.5
3	IS50-32-160	12.5	32	2900	3
4	IS50-32-160A	11.8	28	2900	2.2
5	IS50-32-160B	10.8	24	2900	1.5
6	IS50-32-200	12.5	50	2900	5.5
7	IS50-32-200A	12	45	2900	4
8	IS50-32-200B	10.8	38	2900	3
9	IS50-32-250	12.5	80	2900	11
10	IS50-32-250A	11.7	70	2900	7.5
11	IS50-32-250B	10.8	60	2900	5.5
12	IS65-50-125	25	20	2900	3
13	IS65-50-125A	23.8	17.6	2900	2.2
14	IS65-50-160	25	32	2900	5.5
15	IS65-50-160A	23.4	28	2900	4
16	IS65-50-160B	21.7	24	2900	3
17	IS65-40-200	25	50	2900	7.5
18	IS65-40-200A	23.4	44	2900	5.5
19	IS65-40-200B	21	35.3	2900	4
20	IS65-40-250	25	80	2900	15
21	IS65-40-250A	23.4	70	2900	11
22	IS65-40-250B	21	56	2900	7.5
23	IS65-40-315	25	125	2900	30
24	IS65-40-315A	23.9	114	2900	22
25	IS65-40-315B	22.7	103	2900	18.5
26	IS80-65-125	50	20	2900	5.5
27	IS80-65-125A	46.7	16.6	2900	4
28	IS80-65-160	50	32	2900	7.5
29	IS80-65-160A	46.8	28	2900	5.5
30	IS80-65-160B	42	22	2900	4
31	IS80-50-200	50	50	2900	15
32	IS80-50-200A	46.8	44	2900	11
33	IS80-50-200B	43.3	38	2900	7.5
34	IS80-50-250	50	80	2900	22
35	IS80-50-250A	46.8	70	2900	18.5
36	IS80-50-250B	43.3	60	2900	15
37	IS80-50-315	50	125	2900	45
38	IS80-50-315A	47.7	114	2900	37
39	IS80-50-315B	45.4	103	2900	30
40	IS80-50-315C	42	88.5	2900	22
41	IS100-80-125	100	20	2900	11
42	IS100-80-125A	93.5	17	2900	7.5
43	IS100-80-160	100	32	2900	15
44	IS100-80-160A	93.5	28	2900	11
45	IS100-80-160B	82.4	21. 7	2900	7.5
46	IS100-65-200	100	50	2900	22
47	IS100-65-200A	93.5	44	2900	18.5
48	IS100-65-200B	86.6	41	2900	15
49	IS100-65-250	100	80	2900	37
50	IS100-65-250A	93.5	70	2900	30
51	IS100-65-250B	85.3	58.2	2900	22
52	IS100-65-315	100	125	2900	75
53	IS100-65-315A	95.5	114	2900	55
54	IS100-65-315B	90.8	103	2900	45
55	IS100-65-315C	85.8	92	2900	37
56	IS125-100-200	200	50	2900	45
57	IS125-100-200A	187	44	2900	37
58	IS125-100-200B	165	34. 1	2900	22
59	IS125-100-250	200	80	2900	75
60	IS125-100-250A	187	70	2900	55
61	IS125-100-250B	173	60	2900	45
62	IS125-100-250C	160	50	2900	37
63	IS50-32-125	6.3	5	1450	0.55
64	IS50-32-160	6.3	8	1450	0.55
65	IS50-32-200	6.3	12.5	1450	0.75
66	IS50-32-200A	6	11.5	1450	0.55
67	IS50-32-250	6.3	20	1450	1.5
68	IS50-32-250A	5.9	17.5	1450	1. 1
69	IS65-50-125	12.5	5	1450	0.55
70	IS65-50-160	12.5	8	1450	0.75
71	IS65-50-160A	11. 7	7	1450	0.55
72	IS65-40-200	12.5	12.5	1450	1. 1
73	IS65-40-200A	11. 7	11	1450	0.75
74	IS65-40-250	12.5	20	1450	2.2
75	IS65-40-315	12.5	32	1450	4
76	IS65-40-315A	11.9	28.5	1450	3
77	IS65-40-315B	10.8	24	1450	2.2
78	IS80-65-125	25	5	1450	0.75
79	IS80-65-125A	23.4	4.3	1450	0.55
80	IS80-65-160	25	8	1450	1.5
81	IS80-65-160A	23.4	7	1450	1. 1
82	IS80-50-200	25	12.5	1450	2.2
83	IS80-50-200A	23.4	11	1450	1.5
84	IS80-50-250	25	20	1450	4
85	IS80-50-250A	23.8	17.5	1450	3
86	IS80-50-315	25	32	1450	5.5
87	IS80-50-315A	23.8	28.5	1450	5.5
88	IS80-50-315B	22. 7	25.8	1450	4
89	IS100-80-125	50	5	1450	1.5
90	IS100-80-125A	46.5	4	1450	1. 1
91	IS100-80-160	50	8	1450	2.2
92	IS100-80-160A	46.8	7	1450	1.5
93	IS100-65-200	50	12.5	1450	4
94	IS100-65-200A	46.8	11	1450	3
95	IS100-65-250	50	20	1450	5.5
96	IS100-65-250A	46.8	17.5	1450	4
97	IS100-65-315	50	32	1450	11
98	IS100-65-315A	47.7	28.5	1450	7.5
99	IS100-65-315B	45.4	25. 7	1450	7.5
100	IS100-65-315C	42.9	23.5	1450	5.5
101	IS125-100-200	100	12.5	1450	7.5
102	IS125-100-200A	93.5	11	1450	5.5
103	IS125-100-250	100	20	1450	11
104	IS125-100-250A	93.5	17.5	1450	7.5
105	IS125-100-250B	86.5	15	1450	5.5
106	IS125-100-315	100	32	1450	18.5
107	IS125-100-315A	95.5	28.5	1450	15
108	IS125-100-315B	90.8	26.4	1450	15
109	IS125-100-315C	85.5	23.5	1450	11
110	IS125-100-400	100	50	1450	30
111	IS125-100-400A	93.6	44	1450	22
112	IS125-100-400B	88	38.4	1450	18.5
113	IS125-100-400C	82	33	1450	15
114	IS150-125-250	200	20	1450	18.5
115	IS150-125-250A	187	17	1450	15
116	IS150-125-250B	173	15	1450	11
117	IS150-125-315	200	32	1450	30
118	IS150-125-315A	187	17	1450	22
119	IS150-125-315B	173	15	1450	18.5
120	IS150-125-400	200	50	1450	45
121	IS150-125-400A	187	44	1450	37
122	IS150-125-400B	173	38	1450	30
123	IS200-150-250	400	20	1450	37
124	IS200-150-250A	374	17.5	1450	30
125	IS200-150-250B	346	15	1450	22
126	IS200-150-315	400	32	1450	55
127	IS200-150-315A	374	28	1450	45
128	IS200-150-315B	350	24	1450	37
129	IS200-150-315C	327	21	1450	30
130	IS200-150-400	400	50	1450	90
131	IS200-150-400A	380	44.5	1450	75
132	IS200-150-400B	340	38	1450	55
133	IS200-150-400C	324	31	1450	45
134	IS250-200-300	630	26	1450	55
135	IS250-200-300A	560	21	1450	45
136	IS250-200-400	630	45	1450	110
137	IS250-200-400A	558	38	1450	90
138	IS250-200-400B	550	32	1450	75