LEWA ecoflow INJ-LDC1 Diaphragm Dosing Pump 116.17 L/h

LEWA ecoflow® INJ-LDC1 Diaphragm Dosing Chemical Pump (116.17 L/h)

The LEWA ecoflow® INJ-LDC1 is a positive displacement diaphragm metering pump engineered for critical chemical dosing, boiler water treatment, and offshore chemical injection skids. Built on LEWA’s proven LDC drive frame and configured for a nominal delivery rate of 116.17 L/h, this unit utilizes a hermetically sealed, multi-layer PTFE sandwich diaphragm managed by the patented LEWA Diaphragm Protection System (DPS).

Compliant with strict API 675 standards, the INJ-LDC1 eliminates volatile organic compound (VOC) emissions, zeroing out dynamic seal leakage risks while delivering steady-state accuracy within ±1% across an expansive 10:1 to 100:1 turndown ratio. Engineered to withstand marine engine room environments, cyclic thermal expansion, high suction lifts, and aggressive additives (including hydrazine, scale inhibitors, demulsifiers, biocides, and amine solutions), the pump guarantees operational uptime in continuous, unmonitored industrial installations.

Model Details

• Manufacturer: LEWA GmbH
• Product Series: ecoflow® Modular Metering Pump Series
• Model Configuration: INJ-LDC1 (Injection Skid Spec / LDC-1 Simplex Drive)
• Pump Head Type: M900 / M800 PTFE Sandwich Diaphragm Head
• Manufacturer Part Number (MPN): LDC1-M910S-116.17-SS (Standard 316L/PTFE Configuration)
• Design Type: Reciprocating positive displacement with variable eccentric drive and hydraulic diaphragm coupling

Technical Details

Features

• Patented LEWA DPS (Diaphragm Protection System): Hydraulically balanced PTFE sandwich diaphragm features mechanical positioning that prevents deflection damage during startup, suction line cavitation, or positive pressure surges.
• Integral Diaphragm Monitoring: Dual-layer sandwich construction incorporating an internal pressure sensor/differential pressure switch cell that instantly signals primary layer rupture without fluid escape or process contamination.
• API 675 Metering Accuracy: Delivers ±1% steady-state accuracy, ±3% linearity, and ±1% repeatability across the entire operating stroke length.
• Internal Hydraulic Relief & Refill Valves: Integrated adjustable overpressure relief valve protects the drive unit from discharge blockage, coupled with an automatic hydraulic fluid replenishment valve.
• Hermetic Fluid Containment: Fully seal-less, zero-emission process liquid chamber prevents environmental exposure, making it intrinsically safe for toxic, pyrophoric, and volatile chemical metering.

Compatible Drive Units & Pump Skids

• LEWA ecoflow Modular Series: Compatible with LDC, LDD, and LDE mono and multiplex baseplates.
• Actuation Mechanisms: Direct drop-in compatibility with LEWA manual micrometer handwheel, electric stroke actuators (AUMA, Bernard, ARIS 4–20 mA feedback), or pneumatic diaphragm stroke positioners.
• Motor Standards: Compatible with IEC frame sizes 80M, 90S, 90L (B5 flange / V1 vertical or B3/B5 horizontal foot-flange mounts).

Part Number Cross-References

• Diaphragm Kit (PTFE Sandwich): LEWA P/N 000.068.742 / M900-DIA-046
• Suction Check Valve Assembly (Double Ball 1/2″): LEWA P/N 000.045.891
• Discharge Check Valve Assembly (Spring Loaded): LEWA P/N 000.045.892
• Hydraulic Refill Valve Cartridge: LEWA P/N 000.031.412
• Diaphragm Monitoring Pressure Switch: LEWA P/N DPS-MS-01 / Hydac EDS-3446 alternate

Frequently Asked Questions

What is the exact purpose of the LEWA Diaphragm Protection System (DPS)?

The DPS mechanically controls the position of the diaphragm via a hydraulic spring guide. It prevents the diaphragm from being over-stretched during abnormal operating states, such as a blocked suction line, a closed valve, or excessive inlet pressure. Additionally, it incorporates a monitoring channel that detects a primary diaphragm rupture before process fluid can contaminate the pump mechanics or atmosphere.

Can the flow rate of 116.17 L/h be adjusted during operation?

Yes. Flow adjustment is achievable via two methods: mechanically by altering the eccentric stroke length (0 to 100%) through the manual micrometer handwheel or an electric 4–20 mA actuator; or dynamically by modulating the motor speed using a variable frequency drive (VFD) within allowable motor cooling limits.

What causes a drop in flow accuracy on an API 675 dosing pump?

Common causes include particulate entrapment in the check valve seats, entrapped air within the hydraulic chamber, worn suction valve springs, or fluid viscosity changes exceeding the return spring rating. Regular inspection of the suction and discharge valve balls and seats restores factory metering performance.

Is the LEWA ecoflow INJ-LDC1 suitable for dry-running conditions?

Because the PTFE diaphragm is hydraulically supported and the process chamber contains no dynamic friction seals, the pump can operate dry without immediate thermal damage to the wetted components. However, extended dry running should be minimized to avoid fatigue on internal valve seats.

What are the maintenance intervals for the drive oil and diaphragm?

Under standard continuous-duty operating conditions, the synthetic hydraulic drive fluid should be sampled and changed every 8,000 operating hours or every 2 years. The PTFE sandwich diaphragm features an operating life typically exceeding 15,000 to 20,000 hours when operating within specified temperature and pressure envelopes.