What Is a Triplex Plunger Pump Used For in Chemical Plants?
In chemical processing plants, triplex plunger pumps handle four core duties: chemical dosing (accurate metered injection of reagents), high-pressure fluid transfer, CIP (Clean-in-Place) line washing, and hydrostatic pressure testing of vessels and pipelines.
A triplex pump's three-plunger design delivers near-uniform flow with low pulsation — critical when dosing is measured in grams per hour and process pressure must remain constant.
VANGUARD Series Triplex Pump Specifications
| Specification | Detail |
|---|---|
| Pressure Range | 80 kg/cm² to 800 kg/cm² (80 bar to 800 bar) |
| Design Standard | API 674 (reciprocating positive displacement pumps) |
| Plunger Configuration | 3 plungers (triplex) |
| Plunger Material | Solid Ceramic / Tungsten Carbide Coated |
| Wet End MOC | SS 316 (standard) |
| Drive Type | Belt-driven or Gear Box Mounted |
| Models | STP-20, STP-40, STP-50, STP-60, STP-80, STP-120, STP-140, STP-150 |
| Delivery (small) | 4 weeks (STP-20 to STP-80) |
| Delivery (large) | 14–16 weeks (STP-100 to STP-150) |
VANGUARD Pump Models and Capacity Guide
| Model | Typical Capacity | Max Pressure | Drive Power |
|---|---|---|---|
| STP-20 | Low flow dosing | Up to 200 kg/cm² | 2–5 HP |
| STP-40 | Medium dosing | Up to 200 kg/cm² | 5–15 HP |
| STP-50 | 1,000 LPH | 70 bar | 5 HP |
| STP-60 | Medium-high transfer | Up to 200 bar | 15–30 HP |
| STP-80 | High transfer | Up to 200 bar | 30–60 HP |
| STP-140 | 340 LPM | 120 bar | 150 HP |
All capacities and pressures are customizable. SEW builds to specification — if your process requires 450 LPH at 150 bar, specify and we will size accordingly.
Chemical Plant Applications Served
- Chemical Dosing: Precise injection of acids, alkalis, and polymers at constant pressure regardless of backpressure variation
- High-Pressure Fluid Transfer: Moving process fluids between reactors, storage tanks, and filling lines at 80–800 bar
- CIP Line Washing: High-pressure cleaning of heat exchangers, pipelines, and vessel internals
- Hydrostatic Testing: Pressure testing of vessels and pipelines to 1.5× working pressure
- Misting Systems: Dust suppression in bulk chemical handling and storage areas
Why Chemical Plants Specify VANGUARD Over Imports
Aarti Industries (Jhagadia, Gujarat) and multiple chemical processors across Tamil Nadu, Gujarat, and Maharashtra operate SEW VANGUARD pumps in continuous production service. The deciding factor: domestic service availability.
- SS 316 wet end — handles acids, alkalis, and corrosive process fluids
- API 674 design standard — accepted in QAP documentation and FAT protocols
- Ceramic and Tungsten Carbide plungers — resistant to abrasive chemical slurries
- Spare parts from Nashik: 2–5 day dispatch versus 6–8 week import lead time
- Factory Acceptance Test (FAT) available with QAP documentation on request
Frequently Asked Questions
What is the price of an STP-50 triplex pump?
The SEW VANGUARD STP-50 (1,000 LPH at 70 bar, 5 HP, bare pump) is priced at approximately ₹3.21 lakh ex-works Nashik, ex-GST. Price varies based on motor inclusion, MOC upgrade, and accessories. Request a formal quotation with your exact pressure and flow specification.
What is the difference between belt-driven and gear box mounted triplex pumps?
Belt-driven pumps are the standard configuration — compact, easy to maintain, and suitable for most chemical plant applications. Gear box mounted pumps have direct drive transmission, lower vibration, and are preferred for continuous-duty high-pressure applications. SEW supplies both; specify based on your installation space and duty cycle.
Can a triplex pump handle corrosive chemicals like HCl or H₂SO₄?
Yes, with correct material specification. For strong acids, specify SS 316 wet end with PTFE valve seats and ceramic plungers. Always specify your fluid, concentration, and operating temperature when requesting a quote — MOC selection is critical for chemical service applications.
What documentation does SEW provide with the pump?
SEW provides: Proforma Invoice, technical datasheet, dimension drawing, material test certificates (MTC) for SS 316 components, and warranty certificate. Factory Acceptance Test (FAT) with QAP documentation is available at extra cost for critical applications. NABL/third-party testing can be arranged on request.
