150kW SS316L Submersible Seawater Pump Delivered to a Philippine Offshore Platform

Project Challenge

A marine engineering contractor in the Philippines required a reliable seawater pumping solution for an offshore operating platform. The system provides cooling water, process water supply, emergency firefighting reserve, and seawater circulation for daily platform operations.

Compared with land-based pumping stations, offshore installations face much harsher service conditions. High chloride concentrations, marine organisms, suspended sand particles, and year-round exposure to salt-laden air can significantly shorten the service life of conventional pumps. In addition, offshore maintenance is expensive and difficult, making equipment reliability a critical consideration during procurement.

The customer requested a pump package capable of continuous operation with excellent corrosion resistance, stable motor performance, and low maintenance requirements.

Pump Selection and Technical Configuration

After reviewing the operating conditions and platform power specifications, the project team selected the 300QJH400-80/2-150KW SS316L Submersible Seawater Pump.

Main Specifications

• Model: 300QJH400-80/2-150KW
• Rated Flow: 400 m³/h
• Rated Head: 80 m
• Motor Power: 150 kW
• Voltage: 460V, 3 Phase, 60Hz
• Hydraulic Design: Two-stage impeller configuration
• Material: Full SS316L Stainless Steel Construction

To meet offshore application requirements, all wetted components, including the impellers, pump casing, shaft, diffuser bowls, check valve, and sealing assemblies, were manufactured from SS316L stainless steel. This material offers excellent resistance to pitting corrosion, crevice corrosion, and chloride attack commonly encountered in seawater applications.

The 150kW submersible motor was specially designed for the Philippine 460V/60Hz electrical system, ensuring smooth operation and stable output under varying platform power conditions.

Factory Testing and Delivery

Prior to shipment, the pump underwent comprehensive factory inspections, including hydraulic performance testing, pressure resistance testing, insulation checks, and sealing verification.

Performance data confirmed that the unit consistently achieved the required 400 m³/h flow rate and 80-meter head, while motor temperature rise, vibration levels, and operating current remained within design limits.

The pump package was then prepared for export with seawater-resistant accessories, waterproof submersible cables, and complete English technical documentation for overseas installation and commissioning.

Project Benefits

Following commissioning, the pumping system has demonstrated reliable operation in a highly corrosive offshore environment.

Key advantages reported by the end user include:

• Excellent resistance to seawater corrosion and scaling;
• Stable 24-hour continuous operation;
• Reduced maintenance frequency and offshore service costs;
• Efficient water supply for cooling, firefighting, and production processes;
• Extended equipment service life compared with conventional cast iron pumps.

This project provides a proven reference solution for offshore platforms, coastal industrial facilities, seawater intake stations, and island water supply systems throughout Southeast Asia.