Aplex SC-300L HDD Pump

The APLEX SC-300L is a Quintuplex Plunger Pump. The "L" suffix typically indicates that this model is optimized for high-flow, medium-to-low pressure applications. This pump belongs to the Pentair Myers APLEX SC Series, which is designed for intermittent heavy-duty operating conditions.

Rated and Maximum Speed and Stroke Length

Rated and Maximum Speed (SC-300L): The maximum rated speed is 400 RPM. The normal continuous operating speed range is 150 to 380 RPM, with a minimum operating speed of 100 RPM. The SC-300 (H) model has a maximum speed of 450 RPM.

Stroke Length: The stroke length for all SC-300 series models (including SC-300L, SC-300, SC-300H) is 4.25 inches (107.95 mm). The user-provided data is accurate.

Performance Curve Data (SC-300L)

The flow performance data for the SC-300L at different plunger diameters and operating speeds is shown in the table below. Displacement is calculated based on 100% volumetric efficiency, and required power is calculated based on 90% mechanical efficiency.

Table 1: APLEX SC-300L Performance Data (Flow and Pressure)

Suction/Discharge Port Specifications

SC-300L:

Suction Port: 8" ANSI 150# RF (Raised Face flange)

Discharge Port: 4" ANSI 900# RF (Raised Face flange)

SC-300 (Standard type/H type):

Suction Port: 6" ANSI 150FF (Flat Face flange)

Discharge Port: 3" ANSI 1500RF (Raised Face flange)

Pump Weight and Dimensions

Pump Weight (SC-300L): Approximately 4800 lbs (2177 kg). The user's estimated 2325 lbs (1054.6 kg) is actually the weight of the SC-170DD.

Overall Dimensions:

Length (Length C1): 56-3/8 inches (approx. 1432 mm)

Width (Width A3): 56-3/4 inches (approx. 1441 mm)

Height (Estimated based on C3 in drawing + base): Approx. 25-1/8 inches (centerline of cylinder to mounting face) + base height. The total height of the SC-300L is 22 inches (approx. 559 mm).

Fluid Cylinder / Block

Standard Material (SC-300L):

The standard material for the fluid cylinder (or fluid module) is Steel (Steel ASTM A516 Grade 70).

Optional Materials (General SC Series):

Ductile Iron (e.g., ASTM A536 80-55-06), Aluminum Bronze, other grades of Carbon Steels, and various Stainless Steels.

Structural Features:

The SC-300L fluid cylinder has a quintuplex design, internally containing independent cylinder bores, suction, and discharge valve chambers. Its design is capable of withstanding operating pressures up to 1626 PSI (112.1 bar) and has been subjected to hydrostatic testing at 2500 PSI (172.4 bar).

Valve Type (SC-300L):

Standard is Abrasion Resistant Wing Guided Valve.

Valve Material (SC-300L):

The main material for the valve body and valve seat is 17-4PH Stainless Steel.

Valve Size:

The liquid flow area through the valve seat of the SC-300 (standard type) is 3.92 square inches.

Third-Party Valve Components:

Specialized valve manufacturers provide valve components for the APLEX SC-300L, such as valve (ND-4-V1), valve seat (ND-4-S2/S3), insert (NF-4-I), and spring (5710-33). These components are typically manufactured from high-performance materials to meet demanding operating conditions.

Piston Type (SC-300L):

The SC-300L uses a Rubber piston type. More specific piston cup materials may include high-performance elastomers, HSN (Hydrogenated Nitrile Rubber) with Kevlar® (aramid fiber) composite piston cups, or integral vulcanized pistons to enhance wear resistance and pressure capacity.

Liner Material (SC-300L):

Standard is Hardened Steel Liners.

Optional/Other Series Piston/Plunger and Liner Materials:

Plunger: Uses Rokide® coated stainless steel plungers (typically chromium oxide coating on a 316 S.S. or 410 S.S. base material). Rokide® is a ceramic flame spray process that provides a highly wear-resistant surface. Other optional plunger materials include solid ceramic plungers and tungsten carbide plungers.

Sealing System

Piston Cup Material:

The SC-300L uses "rubber pistons," with specific high-performance elastomers (such as HSN, Kevlar® reinforced) offering better wear resistance, chemical resistance, and high-temperature performance.

Static Seals (O-rings, Gaskets):

Static seals for valve covers, cylinder heads, and stuffing box bodies (if applicable) to cylinder body connections: Typically use Buna-N (Nitrile Rubber) O-rings or gaskets, due to their good oil resistance and general performance.

For special chemical or high-temperature applications, Viton® (fluoroelastomer) or other specialized elastomer materials may be used.

Fluid Cylinder:

Casting: If cast materials like ductile iron are selected, sand casting or precision casting methods can be used.

Forging/Welding: If steel is chosen (e.g., ASTM A516 Gr. 70 for SC-300L), the rough part may be obtained through forging, or it may be assembled from thick steel plates cut, formed, and welded.

Precision Machining: All fluid cylinders require precision machining (CNC machining centers) to ensure dimensional accuracy, geometric tolerances, and surface finish of cylinder bores, valve chambers, sealing surfaces, etc.

Valve Chambers/Piston Bores: As part of the cylinder body, their internal surfaces typically require precision boring and honing to achieve fit accuracy and sealing requirements.

Heat Treatment: Depending on the material selected, processes may include normalizing, quenching and tempering, hardening + tempering, etc., to optimize mechanical properties.

Surface Hardening: The inner walls of liners (e.g., hardening for hardened steel liners, or the ceramic material itself for ceramic liners) and piston/plunger surfaces (e.g., Rokide® coating) all use surface hardening processes to enhance wear resistance and service life.

Table 2: APLEX SC-300L Power End Key Component Materials and Lubrication Summary

Table 3: APLEX SC-300L Key Spare Parts and Recommended Accessories Summary

Main Application Scenarios and Target Customer Industries

APLEX SC Series pumps, with their robust durability and wide performance range, are widely used in various industrial fields. The SC-300L, as a high-flow model in this series, has its main application scenarios and target industries as follows:

Horizontal Directional Drilling (HDD) High-Flow Mud Pumping:

The high-flow characteristics of the SC-300L (up to 585 GPM / 2215 LPM) make it highly suitable for providing ample drilling fluid to large HDD rigs. The Vermeer 100x140 rig, mentioned by the user, typically requires high-flow mud pumps. While SC-170L/DD models are often paired with Vermeer rigs, the flow advantage of the SC-300L is more apparent for larger-scale or more complex HDD projects. Distributors like Buckhorn Pumps explicitly label SC series pumps (e.g., SC-65L) as HDD piston pumps and associate them with specific Vermeer models. HDD operations in large infrastructure projects, such as offshore wind power cable installation, may also utilize such high-flow pumps.

Industrial Cleaning:

The high-flow, medium-pressure characteristics make it suitable for large-scale industrial equipment cleaning, surface treatment, heat exchanger cleaning, etc.

Mine Dewatering and Dust Suppression:

In the mining sector, it can be used for mine dewatering, tailings transportation (depending on abrasiveness), and large-area dust suppression.

Oilfield Services:

Suitable for oilfield water injection (medium-to-low pressure), auxiliary processes for fracturing fluid blending and transport, drilling mud circulation (as a main or auxiliary mud pump), and auxiliary pumping for cementing operations. Similar pump types like the Saigao Q400 (400HP Quintuplex pump) are commonly used in oil and gas production-related applications, and Power Zone also lists similar power quintuplex pumps for saltwater disposal, oil well services, etc.

Other High-Flow Transfer Applications:

Such as high-volume chemical dosing in water treatment plants, descaling water transfer in steel mills, and water supply or drainage in large construction sites.

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