HNA 600S-TW

Key Features

Direct OEM Replacement

Fully interchangeable with SPM TWS600S, drop-in fit for well service pump setups.

API 7K Forged Steel Body

AISI 4130 integral forging with stress relief heat treatment, UT inspection and factory hydrostatic test, complete material traceability.

Low Erosion Hydraulic Cavity

Streamlined internal flow cuts turbulence and stress concentration, resisting slurry washout in frac, cement and acid jobs.

Multi-Bore Compatibility

Accommodates 2.5”–4.5” plungers to cover high-pressure acidizing and high-flow cementing.

Custom Wear & Corrosion Coatings

Optional hard chrome or chemical nickel plating; stainless steel blank available for sour service per NACE.

Fast Maintenance Design

Expanded packing access window; universal standard valve ports for global spare parts compatibility.

Compact Twin-Pump Layout

Space-saving structure supports back-to-back dual pump installation on trucks or skids.

High Precision Machining

5-axis CNC processing with CMM inspection, smooth inner bore to extend packing and plunger lifespan.

Broad Well Service Use

Ideal for cementing, acidizing, gravel packing, well killing and small-scale fracturing.

Full OEM & Aftermarket Support

Custom port modification available; matching valve, plunger and packing spares supplied, 12-month warranty.

Technical Specifications

Product Structure

Integral Forged Main Block

One-piece AISI 4130 forged steel body with integrated plunger bores, suction & discharge valve cavities, internal flow manifolds and connecting flanges. Streamlined integrated runner eliminates assembly leakage points, improves overall structural strength and anti-fatigue performance under high cyclic pressure.

Plunger Packing Assembly Section

Three horizontal plunger mounting holes with enlarged maintenance windows, equipped with stuffing box, packing sets, gland and retaining bolts. This structure seals the reciprocating plunger to prevent medium leakage, with reserved space for quick disassembly and replacement of packings and plungers on site.

Suction & Discharge Valve Cavity Section

Vertical upper and lower double valve cavities for installing suction valve assembly and discharge valve assembly respectively. Standard API valve seat size, matched with valve body, spring and bonnet. Controls one-way fluid intake and discharge during plunger reciprocation to form continuous pumping flow.

Integrated Internal Flow Channel

Interconnected streamlined runners inside the block connect three plunger chambers, shared suction manifold and shared discharge manifold. Optimized curved transition reduces turbulence, sand abrasion and stress concentration, lowering risk of washout and crack failure.

External Connection Flange & Fastening Structure

Standard API 6A suction/discharge flanges at both ends for connecting manifold pipelines; uniform high-strength bolt holes for mounting fluid end onto power end. Standard layout matches original SPM TWS600S installation dimensions for direct replacement.

Compatible Brands

SPM, SERVA，Gardner Denver, Halliburton, FMC, OFM

Applications

• Oil & Gas Well Service

• Cementing Operation

• Matrix Acidizing

• Fracturing Service

• Sand Control Gravel Packing

• Well Killing & Circulation

• Coiled Tubing Operation

• Offshore Well Intervention

• Onshore Oilfield Stimulation

FAQ

Q: Is this fluid end fully interchangeable with original SPM TWS600S?

A: Yes. It adopts identical overall dimensions, valve cavity layout and mounting hole positions, direct drop-in replacement without any modification to power end or truck skid.

Q: What material is the main block and does it meet API 7K?

A: Main body is integral forged AISI 4130 alloy steel, fully compliant with API Spec 7K. Each unit passes ultrasonic flaw detection and factory hydrostatic pressure test with complete material traceability documents.

Q: Which plunger sizes can this fluid end support?

A: Compatible with full series plungers: 2-1/2”, 2-3/4”, 3”, 3-1/2”, 4”, 4-1/2”, covering high-pressure acidizing and large displacement cementing operations.

Q: What surface anti-corrosion treatments are optional for harsh well conditions?

A: Optional chemical nickel plating and hard chrome overlay. 17-4PH stainless steel blank is available for H₂S sour service that meets NACE MR0175 standard.

Q: What working pressure can the HNA 600S-TWS fluid end bear?

A: Max rated working pressure 15,000PSI 105MPa, factory hydrostatic test pressure reaches 1.5 times rated pressure for safety verification.

Q: What matching wear spare parts can you supply together with fluid end block?

A: One-stop supporting parts including suction/discharge valve assemblies, valve seats, plungers, packing sets, bonnets and all fastening bolts, compatible with global standard spare part market.

How HNA 600S-TWS Plunger Pump Fluid End Block Works

The fluid end block is the pressure-bearing core of triplex plunger pump. Driven by the power end, three plungers perform reciprocating linear motion alternately inside plunger bores.

When the plunger pulls back, negative pressure forms in the chamber, opening the suction valve and closing the discharge valve; well fluid flows into the cavity through the suction manifold.

When the plunger pushes forward, internal pressure rises to close the suction valve and lift the discharge valve. The medium is squeezed out through the discharge channel to form continuous high-pressure fluid output.

Optimized integrated flow channels reduce flow resistance and turbulence. Three plungers work in staggered phases to stabilize pressure and flow, meeting continuous cementing, acidizing and fracturing operations.