3/3.5SDm Stainless Steel Deep Well Submersible Pump

3/3.5SDm Stainless Steel Deep Well Submersible Pump

Slim stainless-steel borehole pump engineered to provide efficient and stable water lifting across residential, agricultural and light industrial applications. Multiple capacity and stage options allow buyers to match different well depths, flow requirements and pressure demands while maintaining dependable long-term operation.

Applications

For water supply from wells or reservoirs; for domestic, civil and industrial applications; for garden use and irrigation.

Operating Conditions

Maximum fluid temperature: +40°C; maximum sand content: 2%; maximum immersion: 80 m. Minimum well diameter: 3 in or 3.5 in.

Motor / System Information

Rewindable motor; single phase 150–240V/50Hz; three phase 380–415V/50Hz; NEMA dimension standards; insulation class B; protection grade IP68.

Spu : DW-335SDM

Overview

Overview

Product Information

Product Name	3/3.5SDm Stainless Steel Deep Well Submersible Pump
Series	3SD1 / 3SD2 / 3SD2.5 / 3SD3 / 3.5SD2 / 3.5SD3
Well diameter	3 in / 3.5 in
Voltage	150–240V single phase; 380–415V three phase
Power	0.18–1.50 kW / 0.25–2.00 HP
Capacity range	0.3–4.8 m³/h
Maximum head	Up to 216 m
Outlet	G1–G1½ in
Model Options	3SD1; 3SD2; 3SD2.5; 3SD3; 3.5SD2; 3.5SD3 (multiple impeller-stage variants shown in the original performance tables).

Pump

Model	Q.max	Capacity arrange	Total head arrange
3SD1	3	0.6~2.1	203~18
3SD2	3.6	0.6~2.4	170~17
3SD2.5	4	1.2~3	143~13
3SD3	5.2	1.2~4.2	108~10
3.5SD2	4.5	0.6~3	142~20
3.5SD3	6	1.2~4.2	109~18

MODEL PARAMETERS at 50Hz
Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h	D	=LIVE:RY			n=2850		1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min	(0	03	O06	09	12	1.5	1.8	2A	2.4
3SDM1/8	3SD1/8	O18	025	H(m)		30	34	32	oT	29	26	22	18	13
3SDM1/10	3SD1/10	0.25	0.33			43	42	41	39	36	32	27	22	16
3SDM1/15	3SD1/15	0.37	O05			65	63	61	59	OD	49	41	38	24
3SDM1/22	3SD1/22,	0.55	«(40.75			95	92	89	86	80	71	60	48	36
3SDM1/30	3SD1/30	0,75	1			130	126	122	117	109	97	82	66	49
3SDM1/40	3SD1/40	1 \|)	ts			173	168	162	156	146	=130	£110	88	65
3SDM1/50	3SD1/50	15	2			216	210	203	(195	e2	162	137	110	si

Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h		CELIVERY				n=2850	1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min		03)	0G)	os)	12	15	Pre	21	ae)	a7
3SDM2/6	3SD2/6	0.18	0.25	H(m)		26	26	25	25	24	#23	22	20	tr
3SDM2/8	3SD2/8	0.25	0.33			35	34	34	33	32	31	#29	2F	2	18
3SDM2/11	3SD2/11	0.37	0.5			AB	47	47		45	43	40	37	31	2
3SDM2/17	3SD2/17	0.55	0.75			74	73	72	71	#69	66	62	57	48	«38
3SDM2/24	3SD2/24	0.75	1			104	103	102	100	97	93	88	80	68	54
3SDM2/33	3SD2/33	14	48			144	142	140	187	134	128	#«120	#110	94	74

MODEL PARAMETERS at 50Hz
Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h	0	0.6	1.2	1.8	2.4	3	3.6
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min	0	10	20	30	40	50	60
3SDM2.5/6	3SD2.5/6	0.18	0.25	H(m)		25	25	23	21	18	13	6
3SDM2.5/8	3S$D2.5/8	0.25	0.33			33	33	31	28	24	17
3SDM2.5/11	3SD2.5/11	0.37	0.5			46	45	43	38	33	24	12
3SDM2.5/16	3SD2.5/16	0.55	0.75			67	65	62	56	48	35	17
3SDM2.5/21	38D2.5/21	0.75	1			88	86	81	73	63	45	23
3SDM2.5/26	3SD2.5/26	0.92	1.25			108	106	101	91	78	56	28
3SDM2.5/31	3SD2.5/31	11.	AS			129	127	120	109	93	67	34
3SDM2.5/37	9	1.5	2			154	151	143	130	111	80	40

Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h	0	0.6	12	1.8	24	3	3.6	4.2	4.8
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min	0	10	20	30	40	50	60	70	80
3SDM3/4	3SD3/4	0:18	0.25	H(m)		16	16	15	15	14	13	i	8	5
3SDM3/6	3SD3/6	0.25	0.33			24	24	23	22	21	19	16	12	7
3SDM3/9	3SD3/9	0.37	0.5			36	35	35	34	32	29	25	18	11
3SDM3/13	3SD3/13	055	0.75			52	51	50	49	46	42	36	ai	16
3SDM3/18	3SD3/18	OS	1			7	71	69	67	64	58	49	37	21
3SDM3/22	3SD3/22	1:1.	45			87	86	85	82	78	71	60	45	26
3SDM3/26	3SD3/26	15	2			103.	102	100	97	92	84	71	53	31

Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h	0	0.6	Ae	1.8	2.4	3	3.6
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min	0	10	20	30	40	50	60
3.5SDM2/5	3.5SD2/5	0.25	0.33	H(m)		34	32	30	28	24	20	15
3.5SDM2/7	3.58D2/7					47	45	43	39	34	28	20
3.5SDM2/10	3.5SD2/10	0.55	0.75			67	65	61	56	49	40	29
3.5SDM2/22	3.5SD2/22	1.5	2			148	142	134	123	107	88	64

Outlet:G1"~G1½"

MODEL		P₂		DELIVERY n≈2850 1/min
1~ 220V-240V	3~ 380-415V	kW	HP	Q	m³/h	0	0.6	12	1.8	24	3	3.6	4.2	4.8
1~ 220V-240V	3~ 380-415V	kW	HP	Q	L/min	=O	10	20	30	40	50	60	70	80
3.5SDM3/5	3.5SD3/5	0.25	0.33	H(m)		28	27	26	25	23	21	18	15	11
3.5SDM3/7	3.5SD3/7	0.37	0.5			39	37	36	34	33	30	26	21	15
3.5SDM3/9	3.5SD3/9	0.55	0.75			50	48	46	4a	42	38	33	27	20

Detail / Structure Image

Key Features

Narrow-Diameter Compatibility: Engineered for installation in 3-inch (75mm) and 3.5-inch (89mm) well casings, making it suitable for wells where larger pumps cannot be accommodated .
Stainless Steel Construction: AISI 304 stainless steel is used for the pump casing and motor housing, offering corrosion resistance suitable for extended submersion in various water conditions .
Multistage Impeller System: The pump employs multiple impeller stages to generate high pressure output, enabling water lifting from considerable depths. The number of stages varies by model, from 6 to 22 stages .
NEMA Standard Compliance: Built to NEMA dimension standards, ensuring compatibility with a wide range of industrial components and simplifying system integration .
IP68 Protection & Class B Insulation: The motor is fully sealed with IP68 ingress protection for continuous submersion operation, supported by Class B insulation for thermal durability .
Flexible Motor Options: Available in single-phase (220V-240V) and three-phase (380V-415V) configurations for 50Hz or 60Hz power supplies, accommodating diverse regional electrical requirements .
Integrated Thermal Protection: Single-phase models include built-in thermal overload protection to safeguard the motor from excessive temperature rise .
Special Mechanical Seal: The pump features a specialized mechanical seal designed for deep well applications, providing reliable sealing performance during extended operation .

Technical Specifications

The 3/3.5SDm series includes multiple models with varying power ratings and stage counts. The model nomenclature follows a structured format: "3SDM3.5/6-0.25" indicates a 3-inch pump, SD series, single-phase motor (M), 3.5 m³/h capacity, 6 stages, and 0.25kW power. Three-phase versions use "3SD" without the "M" designation .

Competitive Advantages

Compact Footprint for Restricted Wells: The 3/3.5SDm series addresses a specific market need—high-performance pumping from narrow-diameter wells. While many submersible pumps require 4-inch casings, this series operates efficiently in 3-inch and 3.5-inch wells, providing a solution where installation space is limited.

Hydraulic Efficiency Through Multistage Design: The multistage impeller configuration enables the pump to achieve high heads while maintaining efficient power consumption. Each stage is precisely engineered to optimize hydraulic performance, resulting in lower energy consumption per unit of water delivered. This efficiency is particularly valuable for continuous-duty applications where energy costs represent a significant operational expense.

Material Durability for Long-Term Service: The use of AISI 304 stainless steel for wetted components provides corrosion resistance that extends pump service life. Unlike pumps with cast iron components that may corrode over time in mineral-laden water, the stainless steel construction maintains hydraulic efficiency and structural integrity throughout the pump's operational life.

Flexible Power Configurations: The availability of both single-phase and three-phase motor options, combined with compatibility for 50Hz and 60Hz power supplies, provides installation flexibility across different regions. This versatility simplifies procurement for international projects and reduces the need for voltage conversion equipment.

Certified Quality Standards: The 3/3.5SDm series is manufactured in compliance with international quality standards, with certifications including CE marking for European market access. The NEMA dimension standards compliance ensures compatibility with global industrial components .

FAQ

Q: What is the minimum well diameter required for the 3/3.5SDm pump?
A: The 3SDm series requires a minimum well casing diameter of 3 inches (75mm). The 3.5SDm variant requires a 3.5-inch (89mm) casing. It is important to verify well diameter before installation .

Q: What is the maximum immersion depth for this pump?
A: The maximum immersion depth is typically up to 100 meters, depending on the specific model and motor configuration. Always consult the pump's technical data sheet for the exact specifications of your model .

Q: What is the maximum sand content the pump can handle?
A: The pump can handle water with a maximum sand content of 0.25%. For applications with higher sand content, a sand-resistant version may be considered .

Q: What is the difference between "3SDM" and "3SD" models?
A: The "M" designation indicates a single-phase motor. Models without the "M" are three-phase versions. For example, "3SDM3.5/6-0.25" has a single-phase motor, while "3SD3.5/6-0.25" has a three-phase motor .

Q: What types of control systems are available?
A: The pump can be equipped with either a standard start control box or a digital automatic control box for enhanced system monitoring and protection .

Applications

Township Municipal Water Supply

Mini automatic booster pumps solve low water pressure for villages, small towns and community centralized water supply pipe networks. Matching small fans are available for auxiliary ventilation of municipal pump rooms.

Family Farm & Garden Irrigation

Small self-priming pumps & stainless steel deep well submersible pumps support farm irrigation, garden watering and mountain village domestic water intake.

Industrial Cooling & Circulation

Mini circulation pumps provide stable liquid circulation & cooling for small processing workshops, boiler and solar hot water systems. Auxiliary fans can be matched for workshop air circulation.