Tag Archives: Michigan


Reliability Analysis for Power to Fire Pumps

Reliability Analysis for Power to Fire Pump Using Fault Tree and RBD

Robert Schuerger | HP Critical Facilities

Robert Arno | ITT Excelis Information Systems

Neal Dowling | MTechnology

Michael  A. Anthony | University of Michigan


Abstract:  One of the most common questions in the early stages of designing a new facility is whether the normal utility supply to a fire pump is reliable enough to “tap ahead of the main” or whether the fire pump supply is so unreliable that it must have an emergency power source, typically an on-site generator. Apart from the obligation to meet life safety objectives, it is not uncommon that capital on the order of 100000to1 million is at stake for a fire pump backup source. Until now, that decision has only been answered with intuition – using a combination of utility outage history and anecdotes about what has worked before. There are processes for making the decision about whether a facility needs a second source of power using quantitative analysis. Fault tree analysis and reliability block diagram are two quantitative methods used in reliability engineering for assessing risk. This paper will use a simple one line for the power to a fire pump to show how each of these techniques can be used to calculate the reliability of electric power to a fire pump. This paper will also discuss the strengths and weakness of the two methods. The hope is that these methods will begin tracking in the National Fire Protection Association documents that deal with fire pump power sources and can be used as another tool to inform design engineers and authorities having jurisdiction about public safety and property protection. These methods will enlighten decisions about the relative cost of risk control with quantitative information about the incremental cost of additional 9’s of operational availability.



CLICK HERE to order complete paper

Risk Assessment in Emergency Facilities


Critical Operations Power Systems: Improving Risk Assessment in Emergency Facilities with Reliability Engineering

University of Michigan | Ann Arbor, Michigan
HP Critical Facilities Services | Bethesda, Maryland
Mark Beirne

DLB Associates | Chicago, Illinois

Abstract. The key feature of this article is the application of quantitative method for evaluating risk and conveying the results into a power system design that is scaled according to hazards present in any given emergency management district. These methods employ classical lumped parameter modeling of power chain architectures and can be applied to any type of critical facility, whether it is a stand-alone structure, or a portion of stand-alone structure, such as a police station or government center. This article will provide a risk assessment roadmap for one of the most common critical facilities that should be designated as COPS per NEC 708-a 911 call center. The existing methods of reliability engineering will be used in the risk assessment.


* Robert Schuerger is the lead author on this paper

CLICK HERE to order complete article: IEEE Industry Applications Magazine | Volume 19 Issue 5 • Sept.-Oct.-2013


Pool, Spa & Recreational Waters

“Innenansicht des Kaiserbades in Aachen” | Jan Luyken (1682)

Education communities provide a large market for recreational and therapeutic water technology suppliers.  Some of the larger research universities have dozens of pools including those in university-affiliated healthcare facilities.  Apart from publicly visible NCAA swimming programs there are whirpools in healthcare facilities and therapeutic tubs for athletes in other sports.   Ownership of these facilities requires a cadre of conformance experts to assure water safety.

NSF International is one of the first names in this space and has collaborated with key industry stakeholders to make pools, spas and recreational water products safer since 1949.   The parent document in its suite is NSF 50 Pool, Spa and Recreational Water Standards  which  covers everything from pool pumps, strainers, variable frequency drives and pool drains to suction fittings, grates, and ozone and ultraviolet systems.  

The workspace for this committee is linked below:

Joint Committee on Recreational Water Facilities

The balloting documentation resulting from the September meeting is linked below:

NSF 50i168r5 – JC memo & ballot

(Standards Michigan is an observer on this and several other NSF committees and is the only “eyes and ears” for the user interest; arguably the largest market for swimming pools given their presence in schools and universities.)

There are 14 task groups that drill into specifics such as the following:

Chemical feeders

Pool chemical evaluation

Flotation systems


Water quality

Safety surfacing

The meeting packet is confidential to registered attendees.  You may communicate directly with the NSF Joint Committee Chairperson, Mr. Tom Vyles (admin@standards.nsf.org) about arranging direct access as an observer or technical committee member.   Almost all ANSI accredited technical committees have a shortage of user-interests (compliance officers, manufacturers and installers usually dominate).  We encourage anyone in the education facility industry paying the bill for the services of compliance officers, manufacturers and installers to participate. 

We maintain this title on the standing agenda of our Water and Sport colloquia.  See our CALENDAR for the next onine meeting; open to everyone.

Fullerton College

Issue: [13-89]

Category: Water, Sport

Colleagues: Mike Anthony, Ron George, Larry Spielvogel


Model Aquatic Health Code

IAPMO Swimming Pool & Spa Standards 

UL 1081 Standard for Swimming Pool Pumps, Filters, and Chlorinators | (UL Standards tend to be product standards so we rank them lower in our priority ranking than interoperability standards.)

Aquatic Health Code

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