Combustible Dust Testing

Laboratory testing to quantify dust explosion and reactivity hazards

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Gas and Vapor

Laboratory testing to quantify explosion hazards for vapor and gas mixtures

Classification of hazardous materials subject to shipping and storage regulations
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Thermal Stability

Safe storage or processing requires an understanding of the possible hazards associated with sensitivity to variations in temperature

Adiabatic Calorimetry
Data demonstrate the consequences of process upsets, such as failed equipment or improper procedures, and guide mitigation strategies including Emergency Relief System (ERS) design
Reaction Calorimetry
Data yield heat and gas removal requirements to control the desired process chemistry
Battery Safety

Testing to support safe design of batteries and electrical power backup facilities particularly to satisfy UL9540a ed.4

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Cable Testing
Evaluate electrical cables to demonstrate reliability and identify defects or degradation
Equipment Qualification (EQ)
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Water Hammer
Analysis and testing to identify and prevent unwanted hydraulic pressure transients in process piping
Acoustic Vibration
Identify and eliminate potential sources of unwanted vibration in piping and structural systems
Gas & Air Intrusion
Analysis and testing to identify and prevent intrusion of gas or air in piping systems
ISO/IEC 17025:2017

Fauske & Associates fulfills the requirements of ISO/IEC 17025:2017 in the field of Testing

ISO 9001:2015
Fauske & Associates fulfills the requirements of ISO 9001:2015
Dust Hazards Analysis
Evaluate your process to identify combustible dust hazards and perform dust explosion testing
On-Site Risk Management
On-site safety studies can help identify explosibility and chemical reaction hazards so that appropriate testing, simulations, or calculations are identified to support safe scale up
DIERS Methodology
Design emergency pressure relief systems to mitigate the consequences of unwanted chemical reactivity and account for two-phase flow using the right tools and methods
Deflagrations (Dust/Vapor/Gas)

Properly size pressure relief vents to protect your processes from dust, vapor, and gas explosions

Effluent Handling

Pressure relief sizing is just the first step and it is critical to safely handle the effluent discharge from an overpressure event

FATE™ & Facility Modeling

FATE (Facility Flow, Aerosol, Thermal, and Explosion) is a flexible, fast-running code developed and maintained by Fauske and Associates under an ASME NQA-1 compliant QA program.

Mechanical, Piping, and Electrical
Engineering and testing to support safe plant operations and develop solutions to problems in heat transfer, fluid, flow, and electric power systems
Hydrogen Safety
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Thermal Hydraulics
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Nuclear Safety
Our Nuclear Services Group is recognized for comprehensive evaluations to help commercial nuclear power plants operate efficiently and stay compliant
Radioactive Waste
Safety analysis to underpin decomissioning process at facilities which have produced or used radioactive nuclear materials
Adiabatic Safety Calorimeters (ARSST and VSP2)

Low thermal inertial adiabatic calorimeters specially designed to provide directly scalable data that are critical to safe process design

Other Lab Equipment and Parts for the DSC/ARC/ARSST/VSP2 Calorimeters

Products and equipment for the process safety or process development laboratory


Software for emergency relief system design to ensure safe processing of reactive chemicals, including consideration of two-phase flow and runaway chemical reactions


Facility modeling software mechanistically tracks transport of heat, gasses, vapors, and aerosols for safety analysis of multi-room facilities


Our highly experienced team keeps you up-to-date on the latest process safety developments.

Process Safety Newsletter

Stay informed with our quarterly Process Safety Newsletters sharing topical articles and practical advice.


With over 40 years of industry expertise, we have a wealth of process safety knowledge to share.

Recent Posts

Methods for Measuring Pump Run-Up Time: Gas-Water Waterhammer Analyses

Posted by Fauske & Associates on 03.04.15

by: Damian Stehanczyk, Manager, Thermal Hydraulics Services


The term "pump run-up time" is generally used loosely, and its definition varies significantly by application. Currently no industry guidance exists regarding the precise definition or method of measuring run-up time in gas-water waterhammer applications. In many cases, pump run-up time is considered to be the length of time between when a signal is sent to the pump motor to start discharging fluid and when the pump is discharging fluid at its intended design conditions. However, the latter could be interpreted in two different ways:

(1) the pump has reached its design conditions, but is not yet operating at steady-state; or

(2) the pump has reached its design conditions and is operating at steady-state.

Or, the pump's discharge pressure might be high enough that the flow rate and pressure oscillate without a void present in the system. In this case, the high pump discharge pressure will compress the water in the piping as it runs up and, as a result, will induce oscillations in the flow rate and pressure. After some time, however, the flow rate and discharge pressure will reach a steady-state condition.This difference could become problematic if, for example, a significant amount of compressibility is present in the system, such as due to a gas void (Fig. 1). Simplified schematic of voided piping system

Pump run-up time is a central parameter in gas-water waterhammer analyses and has a first-order influence on the results. The pressures inside a pipe and the resultant forces on those pipes are inversely proportional to the run-up time. A shorter run-up time ylelds higher pressures and forces; a longer run-up time results in the system behaving less dynamically as the fluid accelerates inside the piping. Achieving an appropriate estimate of run-up time, ideally through measured data, is critical for a more representative assessment of the system.

Flow rate during pump run upFor gas-water waterhammer applications, pump run-up time is defined as the length of time between the instance the shaft begins turning and the instance it reaches full speed. Pump run-up time can be calculated if flow rate (Fig. 2), pressure (Fig. 3), or current (Fig. 4) can be measured directly during a pump's run-up. Other methods include using a handheld tachometer to measure the duration of time until the pump blades reach full rotational speed. Using plant data provides a strong technical basis for the input value and significantly removes conservatism from the results. Pressure during pump run up If pump run-up time is not known, a conservative estimate is required, usually in the range of 0.75 to 1.0 s (lowest observed run-up times from previously measured data). However, if the actual pump run-up time is on the order of 2.0 s, for example, the acceptance criteria for the system could be significantly altered. That is, the system might be able to tolerate a non-condensable gas void of 10,000 ins versus one of 1,000 ins. Although pump run-up time can be quantified in several ways, highly accurate values, ideally obtained through measured data, will remove conservatism in the input value and yield a higher acceptance criterion for the system.


Current to the pump motor during run-up

Topics: Thermal Stability, Water Hammer, Nuclear


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