Piston KERR KM-3250PT Pump

 

 

Parameter	KM-3250PT Specification	KM-3250SHPT Specification
Pump Type	Horizontal Triplex Piston	Horizontal Triplex Piston
Rated Power	42.7 BHP (kW)	42.7 BHP (kW)
Max Continuous RPM	510 RPM	510 RPM
Minimum Speed	100 RPM	100 RPM
Stroke Length	2.5 inches / 63.5 mm	2.5 inches / 63.5 mm
Frame Load Rating	"3,978 lbs"	"3,978 lbs"
Fluid Cylinder Pressure Rating	"2,251 PSI"	"3,600 PSI"
Piston Diameter Options
Suction Connection	2" NPT	2 1/2" NPT
Discharge Connection	1 1/4" NPT	1 1/4" NPT
"Pump Weight, Avg."	340 / 155	340 / 155
Drive Type	"Bare shaft, external drive required"	"Bare shaft, external drive required"

 

 

KERR KM-3250SHPT Performance Parameters (Based on 100% Volumetric Efficiency and 90% Mechanical Efficiency)

Piston Dia. (inch)	Max. Press. (PSI)	Disp. Gal/Rev (US Gal)	100 RPM GPM (BPD)	160 RPM GPM (BPD)	210 RPM GPM (BPD)	260 RPM GPM (BPD)	310 RPM GPM (BPD)	360 RPM GPM (BPD)	410 RPM GPM (BPD)	460 RPM GPM (BPD)	510 RPM GPM (BPD)
1.500	2251	0.0574	5.7 (197)	9.2 (315)	12.0 (413)	14.9 (512)	17.8 (610)	20.7 (708)	23.5 (807)	26.4 (905)	29.3 (1004)
1.750	1654	0.0781	7.8 (268)	12.5 (429)	16.4 (563)	20.3 (696)	24.2 (830)	28.1 (964)	32.0 (1098)	35.9 (1232)	39.8 (1366)
2.000	1266	0.1020	10.2 (350)	16.3 (560)	21.4 (735)	26.5 (910)	31.6 (1085)	36.7 (1259)	41.8 (1434)	46.9 (1609)	52.0 (1784)
2.250	1000	0.1291	12.9 (443)	20.7 (708)	27.1 (930)	33.6 (1151)	40.0 (1373)	46.5 (1594)	52.9 (1815)	59.4 (2037)	65.8 (2258)

 

 

Parameter	KM-3250PT Specification	KM-3250SHPT Specification
Pump Type	Horizontal Triplex Piston	Horizontal Triplex Piston
Rated Power	42.7 BHP (kW)	42.7 BHP (kW)
Max Continuous RPM	510 RPM	510 RPM
Minimum Speed	100 RPM	100 RPM
Stroke Length	2.5 inches / 63.5 mm	2.5 inches / 63.5 mm
Frame Load Rating	"3,978 lbs"	"3,978 lbs"
Fluid Cylinder Pressure Rating	"2,251 PSI"	"3,600 PSI"
Piston Diameter Options
Suction Connection	2" NPT	2 1/2" NPT
Discharge Connection	1 1/4" NPT	1 1/4" NPT
"Pump Weight, Avg."	340 / 155	340 / 155
Drive Type	"Bare shaft, external drive required"	"Bare shaft, external drive required"

 

 

KERR KM-3250SHPT Performance Parameters (Based on 100% Volumetric Efficiency and 90% Mechanical Efficiency)

Piston Dia. (inch)	Max. Press. (PSI)	Disp. Gal/Rev (US Gal)	100 RPM GPM (BPD)	160 RPM GPM (BPD)	210 RPM GPM (BPD)	260 RPM GPM (BPD)	310 RPM GPM (BPD)	360 RPM GPM (BPD)	410 RPM GPM (BPD)	460 RPM GPM (BPD)	510 RPM GPM (BPD)
1.500	2251	0.0574	5.7 (197)	9.2 (315)	12.0 (413)	14.9 (512)	17.8 (610)	20.7 (708)	23.5 (807)	26.4 (905)	29.3 (1004)
1.750	1654	0.0781	7.8 (268)	12.5 (429)	16.4 (563)	20.3 (696)	24.2 (830)	28.1 (964)	32.0 (1098)	35.9 (1232)	39.8 (1366)
2.000	1266	0.1020	10.2 (350)	16.3 (560)	21.4 (735)	26.5 (910)	31.6 (1085)	36.7 (1259)	41.8 (1434)	46.9 (1609)	52.0 (1784)
2.250	1000	0.1291	12.9 (443)	20.7 (708)	27.1 (930)	33.6 (1151)	40.0 (1373)	46.5 (1594)	52.9 (1815)	59.4 (2037)	65.8 (2258)

 

 

The fluid end design of the KERR KM-3250 series piston pumps focuses on durability and application-specific material selection.

3.1. Fluid Cylinder / Fluid End Vessel

Standard and Optional Materials:

KM-3250PT: Standard fluid end material is Cast Ductile Iron. Optional materials include Nickel Aluminum Bronze (955), Cast Carbon Steel (WCB), Cast Stainless Steel (CF8M), and Forged Steel (A-105).

KM-3250SHPT: Standard fluid end material is Cast Ductile Iron.

KM-3250BCB (Plunger Pump Reference): Fluid end material options include Forged Carbon Steel (A105) and Forged Stainless Steel (316).

Structural Features: The fluid cylinder is designed to withstand high pressure and provide fluid passages. Kerr Pumps typically emphasize that their fluid ends are precisely machined from high-strength materials to ensure reliability under demanding conditions.

Fluid Cylinder Rated Pressure: KM-3250PT is 2,251 PSI, and KM-3250SHPT is 3,600 PSI.

 

3.2. Valves

Valve Type:

KM-3250PT: Optional Disc Type or Wing Guided valves.

KM-3250SHPT: Uses Wing Guided valves.

Valve Materials:Valve Body/Disc/Insert:

KM-3250PT: Delrin® valve disc with Aluminum Bronze (AB) valve seat, Stainless Steel valve disc with Stainless Steel (SS) valve seat, Monel® alloy, Titanium alloy with Monel® valve seat, Stainless Steel 17-4 HT / AR (Abrasion Resistant).

KM-3250SHPT: 17-4 HT / AR (Abrasion Resistant) Urethane Inserted.

Valve Seat: Material matches the valve disc/insert, such as Aluminum Bronze, Stainless Steel, Monel® alloy.

 

3.3. Pistons

Materials and Structure:

KM-3250PT: Piston material options include HSN (Hydrogenated Nitrile Butadiene Rubber).

KM-3250SHPT: Piston/liner combination options include: Rubber/Ceramic sleeve, Rubber/Chrome plated sleeve, Rubber/Kerramic® (Kerr Ceramic) coating; Dry run/Ceramic sleeve, Dry run/Chrome plated sleeve, Dry run/Kerramic® coating; HSN/Ceramic sleeve, HSN/Chrome plated sleeve, HSN/Kerramic® coating.

Surface Treatment: Piston rods or plungers often feature hardened treatment or wear-resistant coatings, such as Kerr's Kerramic® coating (a ceramic coating) or Colmonoy® 730 hard alloy coating (KM-3250BCB plunger pump option), to improve wear resistance and service life.

 

3.4. Liners

Material Type:

KM-3250SHPT: Liner materials mentioned in piston/liner combinations include Ceramic (Ceramic Sleeved), Chrome (Chrome Plated-Sleeved), and Kerramic® (Kerramic Coat).

Features: Ceramic liners and Kerramic® coated liners offer excellent wear, corrosion, and high-temperature resistance, making them suitable for handling abrasive or corrosive fluids, and can significantly extend service life. Chrome-plated liners also provide good wear resistance.

 

4. Power End Characteristics: Structure, Materials, and Lubrication (KERR KM-3250 Piston Model)
The power end of the KERR KM-3250 series piston pumps is designed to provide stable and reliable power transmission, ensuring the long-term efficient operation of the pump.
4.1. Power Frame/Crankcase

Material: Typically Cast Iron. This is a common material for reciprocating pump power ends, offering good rigidity and vibration damping properties.

Design Features:

Heavy-Duty Design: Adapts to high-load operation.

Inspection Windows/Cover: Access to the crankshaft and connecting rod is possible by removing the pan cover, facilitating inspection and maintenance.

Oil Sump Design: The bottom of the power end has an oil sump for storing lubricating oil. The oil capacity for the KM-3250 series is approximately 4 US quarts (3.785 liters).
4.3. Connecting Rods & Crossheads

Connecting Rods:

Material: Kerr Pumps' general product line uses high strength cast ductile iron. Their QWS2500HD fracturing pump connecting rods use single-piece cast steel, precisely ground and salt-bath nitrided.

Design: Typically automotive-grade design, with a split big end for easy installation on the crankshaft, and equipped with replaceable bearings. The KA-3500PT service manual mentions that connecting rods (KA-20A) are equipped with bearings at both ends.
5. KERR KM-3250 Common Accessories and Key Wear Parts List
5.1. Pistons/Piston Cups

Piston Complete Assembly:

KM-245-225: 2-1/4" Piston Assembly (HSN cup, pressure plate, nut)

KM-245-200: 2" Piston Assembly (HSN cup, pressure plate, nut)

KM-245-175: 1-3/4" Piston Assembly (HSN cup, pressure plate, nut)

KM-245-150: 1-1/2" Piston Assembly (HSN cup, pressure plate, nut)

Piston Cups:

KM-260G-225: 2-1/4" Gold Piston Cup with pressure plate

KM-260-225RD: 2-1/4" RD (possibly refers to specific material or color) Piston Cup with pressure plate

KM-260G-225 (HSN, Black): 2-1/4" HSN Black Piston Cup with pressure plate

KM-260G-200 (HSN): 2" HSN Piston Cup

KM-260G-175 (HSN): 1-3/4" HSN Piston Cup

KM-260G-150 (HSN): 1-1/2" HSN Piston Cup

Material: HSN (Hydrogenated Nitrile Butadiene Rubber) offers good wear and chemical resistance; "Gold" and "RD" may represent composite materials with specific properties. Third-party suppliers mention HSN with Kevlar® composite material.

Piston, Body only:

KM-250-225: 2-1/4" Piston Body

KM-250-200: 2" Piston Body

KM-250-175: 1-3/4" Piston Body

KM-250-150: 1-1/2" Piston Body

 

5.2. Liners

Liner Assembly (Includes Piston, Piston Rod, Lock Nut, Liner, Gasket):

KM-285-225CH-A: 2-1/4" Chrome Liner Assembly

KM-285-225CER-A: 2-1/4" Ceramic Liner Assembly

KM-285-200CER-A: 2" Ceramic Liner Assembly

KM-285-175CER-A: 1-3/4" Ceramic Liner Assembly

KM-285-150CER-A: 1-1/2" Ceramic Liner Assembly

Liner only:

KM-285-225CH: 2-1/4" Chrome Liner

KM-285-225CER: 2-1/4" Ceramic Liner

KM-285-200CER: 2" Ceramic Liner

KM-285-175CER: 1-3/4" Ceramic Liner

KM-285-150CER: 1-1/2" Ceramic Liner

Material: Chrome provides good wear resistance; Ceramic offers excellent wear, corrosion, and high-temperature resistance.

 

5.3. Valve Assembly

Suction Valve Assembly:

KM-305DW: (For T30MDW, possibly similar to KM-3250PT valves)

KM-305ARSS: Wing Guided Valve, Abrasion Resistant, Stainless Steel (WG AR SS)

Rhino Supply SKU: 219500 (Kerr Valve Complete, Suction)

Discharge Valve Assembly:

KM-300DW: (For T30MDW, possibly similar to KM-3250PT valves)

KM-300ARSS: Wing Guided Valve, Abrasion Resistant, Stainless Steel (WG AR SS)

Rhino Supply SKU: 219400 (Kerr Valve Complete, Discharge)

Valve Component Materials:

Valve Body: Typically stainless steel or special alloy steel, heat-treated.

Valve Seat: Matches valve body material or uses hard alloy, such as 17-4PH Stainless Steel.

Valve Disc/Insert: KM-101B (Blue Abrasion Resistant) / KM-101R (Red Abrasion Resistant). Typically Delrin®, Polyurethane, or metal.

Spring: High-strength alloy spring, possibly Inconel® (refer to similar pump types).
5.4. Other Seals

Packing/Seal Kits:

KM-113PT: KM-3250PT Complete Gasket/Seal Kit.

KM-88-0858-150: Packing Set 858 1.50" X 2.25".

KM-88-0858-175: Packing Set 858 1.75" X 2.25".

Pony Rod Seals:

KM-29.

Wiper Rings: Usually integrated into the pony rod seal assembly.

O-rings & Gaskets:

KM-37N: Valve Cover/Stuffing Box Cover O-ring (229/90 Nitrile Rubber).

Q5450HP-38: Valve Cover O-ring (2-228-90 Nitrile Rubber).

KM-295: Liner Gasket.

Common Materials: Nitrile Rubber (Nitrile/Buna-N) offers good oil resistance and versatility.

 

KERR KM-3250 Application Areas, Market Positioning, and Competitive Advantages
Typical Application Scenarios and Target Industries
Based on existing information, the main application scenarios and target industries for the KERR KM-3250 series pumps (especially its piston models such as KM-3250PT and KM-3250SHPT) include:

Horizontal Directional Drilling (HDD): This is a key application area for KM-3250PT/SHPT models highlighted by distributors (e.g., Buckhorn Pumps and Rhino Supply). In such applications, the pump is used to circulate drilling fluid (mud).

Oilfield Services:

Well Service: Power Zone indicates the application of its listed KM-3250 type pumps (plunger type) for well service. This may include small-scale fracturing, cementing assistance, acidizing, pipeline pressure testing, etc.

Injection/Production Support: While the KM-3250's power is relatively small, it may be used for fluid injection or production support in small oilfields or specific process steps.

Industrial Cleaning: High-pressure water jet cleaning is a common application for reciprocating pumps. Kerr Pumps' general application scope includes hydroblasting and cutting. The KM-3250's pressure and flow range make it suitable for some small to medium-sized industrial cleaning tasks.

Hydrostatic Testing: Kerr Pumps' general application scope also includes hydrostatic testing.

Mining Applications: Kerr Pumps lists mining applications as one of their pumps' general application areas. The KM-3250 may be used for mine dewatering, dust suppression, or certain process flows.

General Industrial: Including, but not limited to, metal finishing, parts cleaning, paint systems, coolant circulation, electroplating, phosphating, etc.

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