Dosing skid — Piston / Plunger

Piston / Plunger Dosing Skid System LNS-DZ-PDP

A high-pressure dosing skid for chemical and hydrocarbon injection where process backpressure is beyond the practical range of centrifugal systems and rugged positive-displacement delivery is required.

Product overview · LNS-DZ-PDP

Description

A high-pressure dosing skid for chemical and hydrocarbon injection where process backpressure is beyond the practical range of centrifugal systems and rugged positive-displacement delivery is required.

Typical media

  • Methanol
  • Corrosion inhibitors
  • Scale inhibitors
  • Demulsifiers
  • Biocides
  • Solvents
  • Fuel and refinery additives
  • Neutralizing agents
  • Selected catalysts and process chemicals

Design

Key features

  • High-pressure piston or plunger metering pump
  • Single, 1W+1S, 2W+1S, multi-head or independent trains
  • Manual or electric stroke control
  • VFD speed control
  • Combined stroke and speed control option
  • Suction and discharge pulsation dampeners
  • Mechanical relief valve
  • Back-pressure device
  • Discharge pressure gauge and transmitter
  • Optional flowmeter or flow-verification device
  • Packing leakage collection or detection
  • High-pressure tubing and fittings
  • PLC/HMI and DCS integration

Engineering approach

  • Minimum, normal and maximum injection flow
  • Normal and maximum process backpressure
  • Suction acceleration and NPSH margin
  • Fluid compressibility and gas entrainment
  • Pulsation dampener sizing
  • Piping vibration and support
  • Packing compatibility and leakage management
  • Relief-valve set pressure and return routing

Advantages

  • High and very-high-pressure injection capability
  • Accurate positive-displacement delivery
  • Rugged continuous-duty construction
  • Flexible stroke and speed control
  • Engineered pulsation management
  • Suitable for hydrocarbon and process chemicals
  • Integrated pressure protection
  • Duty/standby and multi-point injection options

Safety philosophy

High-pressure protection philosophy

  • Mechanical relief valve
  • High discharge-pressure alarm and trip
  • Low suction level or pressure inhibit
  • Discharge check and injection valve
  • Packing leak detection
  • Pump drive fault monitoring
  • Local emergency stop and remote ESD
  • Closed drain or drip tray where required

Technical characteristics

Specifications

Product familyLNS-DZ Series — skid-mounted dosing systems
ModelLNS-DZ-PDP — Piston / Plunger Dosing Skid System
Pump technologyPiston / plunger
Flow tendencyLow to medium
Pressure capabilityHigh to very high
Flow characterPulsating
Corrosive liquid suitabilityGood with correct metallurgy
Very low-flow accuracyVery good
High-pressure injectionExcellent
High-flow blendingNot primary
Cleanliness sensitivityModerate
Primary capacity controlStroke / speed
Pulsation controlUsually required
Typical skid dutyHigh-pressure injection
Main design driverPressure / pulsation

Selection note: Final pump and skid selection is based on the chemical identity, concentration, minimum/normal/maximum flow, suction conditions, discharge pressure, density, viscosity, vapour pressure, temperature, solids content, required accuracy, turndown, materials and hazardous-area classification.

Where it's used

Typical applications

  • Oil and gas production
  • Pipeline chemical injection
  • Refineries
  • Petrochemical plants
  • High-pressure process lines
  • Terminal additive systems
  • Industrial chemical injection packages

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