Saacke PZHDS 30 Ignition Oil Pump

Saacke PZHDS 30 Ignition Oil Pump

The Saacke PZHDS 30 is a positive displacement gear pump engineered specifically for the precision delivery of Light Fuel Oil (LFO) and Marine Gas Oil (MGO) to the ignition lances of marine and industrial rotary cup burners. Operating as a critical component in the burner’s startup sequence, this unit guarantees consistent atomization pressure under varying load conditions. It features a hardened steel gear set and a mechanical seal configured to withstand the harsh marine engine room environment, ensuring zero leakage at maximum operating pressures up to 25 bar.

Model Details

• Manufacturer: Saacke
• Model Number: PZHDS 30
• MPN (Manufacturer Part Number): PZHDS-30-IGN
• Part Number Cross-References: Equivalent to OEM part # 4-8255-0013, Replaces legacy unit PZH-30-D.

Key Features

1. Volumetric Efficiency: Precision-machined internal gear tolerances deliver steady flow rates irrespective of downstream pressure fluctuations.
2. High-Pressure Output: Capable of sustaining up to 25 bar pressure, ensuring optimal fuel atomization at the ignition nozzle.
3. Marine-Grade Sealing: Equipped with a heavy-duty mechanical shaft seal (Viton elastomers) to prevent leakage and handle varying fuel temperatures.
4. Integrated Relief Valve: Features an internal bypass and pressure regulating valve to protect against system overpressure during start sequences.
5. Compact Footprint: Flange-mounted design allows for direct coupling to standard NEMA/IEC fractional horsepower motors.

Applications

• Marine auxiliary boiler ignition systems.
• Exhaust gas economizer supplementary firing units.
• Industrial steam generators utilizing Saacke rotary cup technology.
• Main engine starting boilers on commercial vessels.
• Inert gas generator (IGG) burner assemblies.

Pre-Installation Checks

Before mounting the PZHDS 30 onto the burner motor coupling, verify that the drive shaft alignment is within 0.05mm. Misalignment is the primary cause of premature mechanical seal failure in ignition pumps.

Commissioning Pro Tips

• Bleed the System: Never run this gear pump dry. Always gravity-feed or manually prime the pump with clean MGO and bleed the air from the integrated pressure port before engaging the motor.
• Filter Maintenance: Install a 100-micron suction strainer immediately upstream of the pump inlet. Ignition oils often pick up particulate matter from day tanks; gear pumps will score and lose pressure if contaminants bypass the filter.
• Pressure Regulation: Set the ignition pressure strictly according to the specific nozzle datasheet. Overtightening the bypass valve on the PZHDS 30 can cause premature motor stall during cold starts.

Frequently Asked Questions

What type of fuel is the Saacke PZHDS 30 rated for?

The PZHDS 30 is strictly rated for light distillates, specifically Marine Gas Oil (MGO), Marine Diesel Oil (MDO), and Light Fuel Oil (LFO). It is not designed to pump Heavy Fuel Oil (HFO) due to viscosity constraints on the internal gear tolerances.

How do I adjust the pressure on the PZHDS 30 pump?

Pressure adjustments are made via the regulating screw located on the bypass valve housing. Turning the screw clockwise increases the atomizing pressure, while turning it counter-clockwise decreases it. Always use a calibrated pressure gauge on the delivery port when making adjustments.

Why is my ignition pump failing to build pressure?

Failure to build pressure is typically caused by air trapped in the suction line, a blocked upstream fuel filter, or excessive wear on the internal gears. Verify that the suction line is fully bled and check the 100-micron filter element before investigating mechanical faults.

Can the mechanical seal on this pump be replaced on board?

Yes, the mechanical seal can be replaced on board by ship staff. Ensure the pump is completely isolated, drained, and removed from the motor coupling. A standard Saacke seal kit is required, and care must be taken not to scratch the shaft when fitting the new ceramic/carbon faces.