Liquid Transient Software

Fluid Flow Consultants offers a range of programs that perform surge (transient, waterhammer) analyses on liquid pipelines and pipeline networks, from our PAULA series (for pipelines and well strings with no loops or branches), to our NATASHA series (pipeline networks with multiple sources (supplies), multiple sinks (deliveries) and multiple loops). Surge analysis is the calculation of the pipeline systems' response to a time-dependent perturbation or upset condition, such as valves closing, pumps ramping down, etc. The user inputs physical data such as pipe lengths, sizes and node connections, elevations, liquid properties and equipment characteristics (pump data, valve closure times, etc.). NATASHA / PAULA PLUS then calculates pressures and flows at all calculation points and time steps in the model. Calculated pressures (heads) are displayed graphically along with the elevation and Maximum Allowable Operating Pressure (MAOP) profiles as they are calculated. Calculated results are also written to tabular and graphics output files. The tabular report contains various summaries which indicate if, where and when the pressure exceeds the MAOP's or reaches minimum allowed pressures (causing cavitation). Calculated pressures, elevations and MAOP's versus distance graphs, or calculated pressures and flows versus time graphs may be displayed and printed. All of these programs have the following:

Methods and Features ...

• Handles up to 250 pipes and 251 nodes (equipment is placed at nodes)
  
• Up to 25 calculation segments per pipe
  
• Equipment Available (Centrifugal Pumps, Valves, Check Valves, Surge Tanks, PRV's, Fittings, Leaks, Air Chambers, Variable Supply/Delivery Pressure and Flows)
  
• Any Pipeline or Network Structure (Multiple Sources, Multiple Sinks, Loops)
  
• Industry-Proven Method Of Characteristics
  
• Friction, Static-Head & Inertia
  
• 4 selectable friction methods (Moody diagram, Modified Colebrook-White, MIT, Hazen-Williams)
  
• Flat or Detailed Elevation Profiles (up to 2500 elevations)
  
• Liquid Compressibility & Pipe Expansibility
  
• Multiple Liquid Properties for Batching & Temperature Variation
  
• Drag Reduction
  
• Cavitation & Column Collapse
  
• Opening & Closing Valves
  
• Discharge and Suction Control on Pumps
  
• Run-time and Post-Run Graphics
  
• Built-in Steady-State Module that can be run separately from the Transient Module
  
• Calibration Module (matches initial pressures to known operating pressures)
  
• Detailed or Summarized Output Reports
  
• Context-Sensitive On-Line Help
  
• Full 32-bit code
  
• U.S. or S.I. Field Units
  
• User's Manual with Examples & Theory
  
• Technical Support available by Phone, FAX or E-mail

Fluid Flow Consultants, 8004 S. Juniper Ave., Broken Arrow, OK 74011-6452. Tel: 918-451-1024; Fax: 915-451-3365.