Marine Hand Fuel Pump

I. Product Overview

Marine Hand fuel pumps are the "manual power core" of ship emergency fuel supply systems, designed specifically for emergencies such as power outages and fuel system failures. By manually rotating the crank handle to drive plunger or gear structures, they pressurize and deliver fuel from emergency fuel tanks to main engines, generators, and other equipment, ensuring ships complete critical operations (e.g., berthing, anchoring) before losing power. Constructed with cast iron (HT200), bronze alloy (ZCuSn10Pb2), or stainless steel (316L) as the main material, they achieve self-priming and low-pressure delivery through purely mechanical transmission, without requiring electrical or hydraulic assistance. They are compatible with fuel types such as diesel and heavy oil (needing preheating). The pump body undergoes anti-corrosion treatment and precision assembly, with a service life of ≥10 years in -20℃~60℃ environments. It meets IMO Ship Fuel Emergency System Specifications (MSC.382(94)) and emergency equipment certification requirements of classification societies such as RS, LR, ABS, and CCS, widely used in emergency fuel supply systems of cargo ships, oil tankers, passenger ships, and other vessel types.

II. Core Technologies and Material Characteristics

1.Material Selection and Performance

2.Key Technical Parameters

Flow range: 1-8L/min, with a single continuous operation at 30 rpm delivering 3-5L of fuel, meeting startup and short-term operation needs of small and medium-sized equipment

Output pressure: 0.5-1.5MPa, adapting to emergency fuel pipeline resistance (including filter and check valve losses) to ensure fuel reaches injectors directly

Medium compatibility: Capable of conveying light diesel (viscosity 8-20cSt), heavy diesel (viscosity 20-100cSt), low-sulfur fuel (sulfur content ≤0.5%), with temperatures ranging from -20℃ to 60℃ (heavy oil requires preheating to above 40℃)

Self-priming performance: Self-priming height ≥2m, priming time ≤40 seconds (for No.0 diesel), capable of directly drawing oil from low-level emergency fuel tanks without manual filling

Operating force requirement: Crank handle operating force ≤40N (approximately 4kgf), enabling one person to deliver 10-15L of fuel by continuous cranking for 3 minutes, meeting main engine emergency startup fuel needs

3.Safety and Explosion-Proof Design

Explosion-proof structure: Pump body and crank transmission parts use copper alloy friction pairs to avoid sparks from mechanical friction, suitable for Zone 2 hazardous areas near fuel tanks

Anti-backflow device: A check valve installed at the outlet prevents fuel backflow to the tank after shutdown, ensuring pipelines are filled with fuel and no venting is needed for next startup

Overload protection: Built-in overflow valve automatically opens (returning oil to the suction end) when outlet pressure exceeds 1.2 times the rated value, avoiding pipeline rupture due to overpressure

III. Technical Advantages and Innovative Design

1. Emergency Operation Reliability

Dual-plunger linkage structure: Adopts main and auxiliary dual-plunger alternating design, completing 2 suction-discharge cycles per crank rotation. Flow is 80% higher than single-plunger pumps with pressure fluctuation ≤±0.05MPa.

Labor-saving transmission system: Uses "gear reduction + eccentric wheel" combined mechanism to amplify crank torque by 3 times, reducing operating force by 30% compared to traditional hand pumps at the same flow, suitable for continuous operation in emergencies

Integrated fuel preheating: For heavy oil applications, the pump body is wrapped with an electric heating jacket (can connect to battery power in emergencies), capable of heating heavy oil from 20℃ to 50℃, reducing viscosity to below 50cSt to ensure smooth flow.

2. Wear and Corrosion Resistance Enhancement

Plunger surface hardening: Stainless steel plungers undergo chrome plating (0.05mm thickness) to achieve HV800 surface hardness, improving resistance to fuel impurity wear by 50% compared to ordinary stainless steel, extending service life to 8000 operations.

Cast iron pump inner wall treatment: HT200 pump chambers are sprayed with an epoxy resin coating (0.1mm thickness), resisting diesel immersion without rust and showing no significant corrosion after 1000 hours in 3% salt spray environment.

3. Ship Emergency Adaptability

Portable design: Single unit weight ≤20kg (5L/min model) with a carrying handle and quick connector, connectable to different equipment via 10m hoses to meet mobile emergency fuel supply needs.

Low-temperature startup optimization: In -20℃ environments, pumps contain low-temperature grease (dropping point ≥-30℃) to ensure smooth crank rotation without jamming, suitable for emergency use in cold regions.

IV. Typical Application Scenarios

1. Main Engine Emergency Startup and Operation

Cargo ship main engine emergency startup: When main fuel pump failure causes main engine shutdown, crew use stainless steel Hand fuel pumps (flow 5-8L/min, pressure 1.2MPa) to deliver No.0 diesel to main engine high-pressure fuel pumps. Continuous cranking for 5 minutes (delivering 25-30L fuel) enables main engine emergency startup.

Generator short-term power supply: When offshore fishing boat generators shut down due to fuel pump failure, cast iron hand pumps (flow 1-3L/min, pressure 0.8MPa) supply fuel to generators. Continuous operation at 20 rpm maintains 5kW generator operation for 1 hour (consuming approximately 4L fuel), ensuring communication equipment power supply.

2. Special Working Condition Emergency Fuel Supply

Oil tanker cargo tank emergency heating: When fuel heating systems lose power, bronze alloy hand pumps (flow 3-5L/min, pressure 1.0MPa) deliver diesel to fuel heating coils, heating cargo oil via burners to prevent high-viscosity crude oil from solidifying.

Polar ship fuel delivery: In -20℃ ice zone navigation, stainless steel hand pumps with heating jackets (flow 2-4L/min) heat -15℃ low-sulfur diesel to 10℃ (viscosity reduced to 15cSt), ensuring diesel generator startup.

3. Emergency Evasion Operations

Ship emergency anchoring: When main propulsion systems lose power, portable bronze hand pumps (flow 4-6L/min) supply fuel to windlass hydraulic systems. Cranking for 10 minutes completes anchor chain lowering, ensuring ships emergency berth in dangerous waters.

Post-collision fuel switching: When ship collisions cause main fuel tank leaks, crew use stainless steel hand pumps (flow 5-7L/min) to quickly deliver diesel from emergency fuel tanks to main engines, completing fuel system switching within 3 minutes.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Fuel type: Cast iron/bronze pumps for light diesel; stainless steel pumps for heavy diesel and high-sulfur fuel; heating-equipped models for polar scenarios

Flow matching: Configure 1.5 times the emergency equipment fuel consumption. For example, a main engine requiring 20L/min fuel for startup (short-term) needs a pump with flow ≥30L/min (for 3 minutes of continuous operation)

Pressure requirements: 0.5-0.8MPa for small generators; 1.0-1.5MPa for main engines and windlasses

2. Maintenance Points

Daily inspection: Crank 20 turns weekly to check for pump leaks and check valve sealing, ensuring availability in emergencies

Regular maintenance: Disassemble and clean plungers and valve seats every 6 months, replace aging seals (oil-resistant fluororubber), and apply special grease to transmission parts

Fuel compatibility maintenance: Flush pump chambers with diesel for 2 minutes before switching fuel grades to avoid precipitation from fuel mixing

Low-temperature protection: Add antifreeze oil (pour point ≤-30℃) to non-heated pumps before winter to prevent internal freezing and jamming

3. Compliance Inspection

Annual classification society inspection focusing on verifying flow stability (fluctuation ≤±10%), explosion-proof performance, and low-temperature startup reliability

Meets IMO requirements for ship emergency fuel systems, ensuring emergency fuel supply can be established within 10 minutes after main system failure

VI. Compliance and Certification

International standards: Complies with ISO 8661 Marine Diesel Engine Fuel Systems and IMO MSC.382(94) emergency fuel system specifications

Classification society certifications: Obtained type approval for Hand fuel pumps from RS, LR, ABS, and CCS (including 500 cycle operation tests and explosion-proof performance verification)

Environmental requirements: Compatible with low-sulfur fuel (sulfur content ≤0.5%), meeting IMO 2020 global sulfur emission limits