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3.5 SD Deep Well Pump


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The SD series stainless steel deep well submersible pump is an integrated groundwater extraction device, with its most notable feature being the combination of the motor and pump into a single unit. Constructed from stainless steel, this pump boasts excellent corrosion resistance and hygienic properties. The equipment operates by submerging the motor and pump directly into the water, making it suitable for water lifting projects in deep wells, rivers, reservoirs, and similar environments. It is primarily used for agricultural irrigation, drinking water supply for people and livestock in plateau and mountainous regions, as well as urban and industrial water supply and drainage. Its compact structural design ensures easy installation and maintenance, while also delivering high efficiency, energy savings, and safe, reliable operation.

Model:
3.5"SD
Brand:
SRM or Customized

Product Description

FAQ

Product Advantage

High Efficiency & Energy Saving: Optimized hydraulic design reduces energy consumption, achieving higher operational efficiency than comparable products.
Corrosion Resistance: Stainless steel construction ensures long-term resistance to water corrosion, extending equipment lifespan .
Lightweight Design: Compact and lightweight structure facilitates transportation and underground installation.

Technical Parameters

Operating conditions

Maximum fluid temperature up to +35℃.

Maximum sand content: 0.25%.

Maximum immersion: 80m.

Minimum well diameter:3.5".

Motor and Pump

Rewindable motor or Full obturated screen motor

Three-phase OR Single-phase

Pumps are designed by casing stressed

Curve tolerance according to ISO 2548

Options on request

Equip digital auto-control box

Special mechanical seal

Other voltages or frequency 60 Hz

Components	Material
Pump external casing	AISI 304 SS
Delivery casing	Cast-Cu ASTM280
Suction lantern	Cast-Cu ASTM280
Diffuser	Plastic.PC
Impeller	Plastic.POM
Shaft	①AISI 316 SS ②AISI 304 SS
Shaft coupling	①AISI 316 SS ②AISI 304 SS
Wear ring	AISI 304 SS
Motor external casing	AISI 304 SS
Top cover	Cast-Cu ASTM280
Bottom support	AISI 304 SS
Mechanical seal	Special seal for deep well(carbon-SIC/TC)
Shaft	AISI 304 SS-C1045
Bearing	NSK
Seal lubricant oil	Oil for food machinery and pharmaceutic use.

Model Optional

MODEL				DIMENSIONS(mm) WEIGHT(kg) DN L1 L(S) L(T) G(S) G(T)
1~		3~
220V/240V		380V/415V
3.5SDM2.5/5	3.5SD2.5/5		14"		337	606	596	8	7
3.5SDM2.5/7	3.5SD2.5/7		14"		383	662	680	9	9
3.5SDM2.5/10	3.5SD2.5/10		14"		452	757	749	11	10
3.5SDM2.5/14	3.5SD2.5/14		14"		544	874	856	12	11
3.5SDM2.5/18	3.5SD2.5/18		14"		637	991	964	13	12
3.5SDM2.5/22	3.5SD2.5/22		14"		761	1160	1108	16	14
3.5SDM2.5/26	3.5SD2.5/26		14"		853	1253	1200	16	14
3.5SDM2.5/30	3.5SD2.5/30		14"		946	1390	1323	19	16
3.5SDM2.5/35	3.5SD2.5/35		14"		1061	1506	1438	20	17
·In the list:L(S) is single phase motor, L(T) is three phase motor In the list:G(S) is single phase motor, G(T) is three phase motor

Performance Charter

Performance Data 50Hz
MODEL		P₂		DELIVERY n≈2850 r/min
1~ 220V/240V	3 380V/415V	KW	HP	m³h	0	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0	3.3	3.6
				Q I/min	0	5	10	15	20	25	30	35	40	45	50	55	60
3.5SDM2.5/5	3.5SD2.5/5	0.18	0.25	H(m)	28	28	27	27	26	25	23	21	19	17	14	10	7
3.5SDM2.5/7	3.5SD2.5/7	0.25	0.33		40	39	38	38	36	35	33	30	27	23	19	14	10
3.5SDM2.5/10	3.5SD2.5/10	0.37	0.5		57	56	55	54	52	50	47	43	38	33	27	21	14
3.5SDM2.5/14	3.5SD2.5/14	0.55	0.75		80	78	77	75	73	70	65	60	54	46	38	29	20
3.5SDM2.5/18	3.5SD2.5/18	0.75	1		102	101	99	97	94	89	84	77	69	60	49	37	25
3.5SDM2.5/22	3.5SD2.5/22	1.1	1.5		125	123	121	118	114	109	102	94	84	73	60	45	31
3.5SDM2.5/26	3.5SD2.5/26	1.1	1.5		148	146	143	140	135	129	121	111	100	86	71	53	36
3.5SDM2.5/30	3.5SD2.5/30	1.5	2		171	168	165	161	156	149	140	129	115	99	81	62	42
3.5SDM2.5/35	3.5SD2.5/35	1.5	2		199	196	192	188	182	174	163	150	134	116	95	72	49

Product Uses

Agricultural Irrigation: Supports high-capacity groundwater extraction to meet farmland water demands.
Drinking Water Supply: Suitable for water supply projects in remote areas such as highland and mountainous regions.
Industrial Drainage: Used for water supply and drainage in mines, railways, and construction sites.

FAQs

How to Choose a Deep Well Pump?

Head Matching: Ensure the rated head does not significantly exceed the actual operating head—ideally, no more than 25% higher than the actual requirement. The actual head is the vertical distance from the well's water level to the discharge pool, including:
Net head (static lift)
Friction head loss (typically 6–9% of net head, or 1–2 meters).
The impeller should be submerged 1–1.5 meters below the water level, and the total length of the submerged pump section must not exceed the maximum well depth specified in the manual.
Flow Rate Selection: Match the pump’s flow rate to the well’s yield capacity.
Sand Content: Avoid water with excessive sand (>0.1%), as it accelerates wear and shortens the pump’s lifespan.
Size Compatibility: The pump’s maximum outer diameter should be 25–50 mm smaller than the well diameter to prevent vibration-induced damage to the well casing.
(Note: Technical terms like "head," "impeller," and "friction loss" are precisely translated. Key parameters (e.g., 25%, 0.1%) are retained for accuracy. Safety margins (e.g., 25–50 mm clearance) are emphasized for practical application.)
What Makes SRM Pumps Different?

With over 40 years of expertise in professional pump manufacturing, SRM Group—a Top 500 Enterprise in China—stands out for its:
Mature Production System–Rigorous quality control ensures reliable, high-performance pumps.
Customer-Centric Approach–We customize solutions to meet specific needs.
End-to-End Support–Beyond a 1-year warranty, we provide ongoing service assistance.
Choose SRM for durable, tailored pumping solutions backed by decades of industry leadership.
How to Purchase SRM Pumps?

Purchasing SRM pumps is simple:
Contact Us–Visit our website and reach out via:
Email Phone Social Media DM
(A dedicated representative will assist you promptly.)
Can I Use My Own Logo?

Custom Branding Option–We support OEM/ODM services and can produce pumps with your logo, provided you:
Own the trademark OR
Have authorization from the trademark owner.