2017 treeo - approval and type ii assemblies and type ii detector assemblies paul h. schwartz, usc...

Approval and Type II Detector AssembliesPaul H. Schwartz, USC FCCCHR

UF TREEO Conference15‐16 February 2017 1

Paul H. Schwartz, P.E.Chief Engineer

USC Approval and Type II Detector Assemblies

What’s New at USC

What’s New at USC?

• One-day seminars / webinars

What’s “Old News” at USC?

What’s “Old ” at UF TREEO?

The USC FoundationApproval Program



What Does Approval Mean?

• Product complies with performancebased standard

- Standard defines what a product is supposed to do

- Standard defines a procedure for testing or evaluating

- Standard defines cause for failure or rejection

Approval Program• Not a rating system

• Product meets minimum standard

Standard

Approval Program• USC - Two Part Process

- Laboratory Evaluation

- Field Evaluation

Approval ProgramLaboratory

• All testing conducted by trained USC Staff at USC Foundation Laboratory

- Third party laboratories not used

• Manufacturers may witness, but not participate in the testing


• Submission of Working Drawings

• Hydrostatic

• Pressure (Head) Loss vs. Flow Rate

• Elastomer / Spring Documentation

• Backsiphonage and Backpressure Test

• Thermal Loop

• Cycle test



- Design Requirements

- Material Requirements





- Failure to comply with Design Requirements



- Failure to comply with Design Requirements



- Failure to comply with Material Requirements


• Hydrostatic Tests – Structural Integrity

- Twice (2X) maximum rated working water pressure (MWWP) – 10 min

- Failure criteria

• Leakage

• Damage

• Permanent deformation

2 x MWWP; typically 2 x 175psi = 350 psi



- Body leak or rupture




Backpressure each check valve


Backpressure each check valve


• Dislodged parts that leak


• Broken parts that leak

New Part-- Flat --

Tested Part-- Bent --

• Permanent deformation / damage



• Pressure (Head) Loss vs. Flow Rate



P r essu r e L o ssInlet Outlet


• Pressure Loss vs Flow Rate Protocol

- NOT only a single point

• At rated flow






(200%)






• Elastomer Documentation

- Durometer (hardness)

• 9th Edition Std.

- Check: 35-45 Shore A

- RV: 55-65 Shore A


• Elastomer Specifications

- Durometer (hardness)

• 10th Edition Std.

- No restrictions

BackpressureVacuum


RP – Backsiphonage / Backpressure Test

• Vertical up (VU) orientation


Thermal Loop

• Thermal Loop Performance Test- Assembly must function at rated Temperature (MWWT)

and Pressure (MWWP) for 100 hours- Maximum Rated Working Temperature

• Minimum of 140o F - Based upon real-world field measurements

- Maximum Rated Working Pressure• Typically 175 psi






Cycle test

• Cycle Test includes 5,000 cycles:

- Various flow rates

• 25%, 50%, 75%, 100% of rated flow

- Depressurize upstream

- Apply backpressure


• Cycle Test Criteria

- Damage vs Performance





• Failure to comply with any laboratory test is cause for failure

• Damage or permanent deformationto the assembly is cause for failure


• Over 50% of the assemblies which were listed by other listing agencies and submitted to USC from 2009 to 2012 failed the USC Foundation Laboratory evaluation initially

• USC – FCCCHR

- No Laboratory Approval

- Released to Field Evaluation

• Only Listing/Approval Agency that requires successful completion of a Field Evaluation


• USC – FCCCHR

- Staff may not release evaluation status updates to public

- Official contact list

• Provided by each Manufacturer


Approval ProgramField

Field Evaluation

• Manufacturer responsible for finding field sites

- Anywhere in North America

• DO YOU HAVE POTENTIAL FIELD TEST SITES?

- Generally installed within 500 mile radius of L.A.

• Manufacturer is encouraged to locate field test sites

as Laboratory Evaluation is being conducted




• Field Site Criteria

- Non hazardous location

- Accessible

- Acceptable to administrative authorities and owner

- Variety of applications

- Different pressures

- High flowing site (50%-100% of rated flow)


• Field Evaluation “clock” starts once three (3) assemblies have been initial field tested.

• Manufacturer may install more than 3

• Foundation Staff conducts all field tests

• Requires twelve (12) consecutive months of simultaneous trouble-free service



• Twelve (12) Months Trouble-free Service

- Three sites for each make, model, size, and orientation

• Initial field test and inspection

• Monthly field tests

• Final field test and inspection


• Failure to pass field test is cause for rejection

- However, Dirt / Debris not cause for failure


• Design or material failure is cause for rejection- Manufacturer immediately notified

• Field Evaluation Stopped- Redesign / Modify- Resubmit for Laboratory Evaluation- Change out Assemblies / components

• Restart Field Evaluation “clock” at zero


• Approximately 30% of the assemblies passing the USC laboratory evaluation do not pass the field evaluation the first time

• Of those that fail the field evaluation, approximately 70% fail in the last three months



The USC FoundationUSC Approval

USC Approval

• USC List of Approved Backflow Prevention Assemblies

USC List on Mobile Devicesusclist.com

Approval of Backflow Preventers

• Performance Standards- Double Check Valve Assemblies (DC)- Reduced Pressure Principle

Assemblies (RP)- Vacuum Breakers

• PVB, SVB, AVB- Detector Assemblies

• DCDA, DCDA-II• RPDA, RPDA-II

Approval of Backflow Preventers

• Performance Standards- Double Check Valve Assemblies (DC)- Reduced Pressure Principle

Assemblies (RP)- Vacuum Breakers

• PVB, SVB, AVB- Detector Assemblies

• DCDA, DCDA-II• RPDA, RPDA-II

Fire Sprinkler Systems




• Manual – 10th Edition- Non-potable water piping- Fire department connection- Auxiliary water systems- Additives

AWWA Manual M-14

AwwaRF Study ~1998

• Impact of Wet-Pipe Fire Sprinkler Systems on Drinking Water Quality

- Wet based fire sprinkler systems

• Primarily exceed secondary water quality standards


• Detector Assemblies- Prevent backflow and detect

unauthorized use of water• DCDA• DCDA-II• RPDA• RPDA-II

QUIZ QUESTIONIn which Edition of the USC Manual was the new Standard added for Double Check Detector Assemblies (DCDA)?

A. 4th Edition - 1969B. 6th Edition – 1979C. 8th Edition – 1988D. 9th Edition – 1993E. 10th Edition - 2009

Standards

QUIZ QUESTIONIn which Edition of the USC Manual was the new Standard added for Double Check Detector Assemblies (DCDA)?

A. 4th Edition - 1969B. 6th Edition – 1979C. 8th Edition – 1988D. 9th Edition – 1993E. 10th Edition - 2009

Standards



“Detector” Assemblies

Unauthorized use?


Which way to go?


Path of less resistance

2.5 psid 2.5 psid

5.0 psid



2.5 psid 2.5 psid

5.0 psid

First 3 gpm



1.5 psid 3.5 psid

5.0 psid


1.2 psid 4.5 psid



DCDA – Main Line Assembly

• Sometimes “standard” DC springs

• Sometimes two “stronger” springs

• Sometimes one “stronger” spring

- 1st Check Valve, or

- 2nd Check Valve

USC Manual – 10th Edition MRC

• Chapter 10 – DCDA / RPDA- BPMA requested lowering of bypass flow

• 3 gpm to 2 gpm- BPMA requested new concept

• Bypass only one mainline check valve

• Goal? Lower overall pressure loss

USC Manual – 10th Edition Standard

• Chapter 10 – DCDA / RPDA- Reduced bypass flow from 3 gpm to

2 gpm

- New DCDA-II and RPDA-II- Only bypasses one mainline check

valve



First 2 GPMinstead of

3 GPM

Manual - 10th Edition

• Chapter 10 - New AssembliesType II Detectors Assemblies -DCDA-II /RPDA-II

Type II Detector

1.2 psid 2.5 psid



Type II Detector

• Bypass Assembly– Basically a double

check valve without a second check valve.

– SOV’s– TC’s

• NOT A SEPARATELY APPROVED ASSEMBLY


• Chapter 10 - DCDA vs DCDA-II- Detect low flows – unauthorized use- Flow through path of least resistance


• Lower overall pressure loss

Field Testing – Field Test Form

• DCDA-II / RPDA-II- How are these assemblies reported?

• Two forms?• Modify existing forms?

- Add new “box” for bypass check valve

Field Testing – Field Test Form(s)



Field Testing – Field Test Form(s) Field Testing – Field Test Form(s)

Field Testing – Field Test Form Field Testing – Field Test Form

Contact Information

• Email – [email protected]

• Toll Free – 866.545.6340

• Web – fccchr.usc.edu

Social Media

• @uscfccchr

• facebook.com/uscfccchr

• youtube.com/uscfccchr



Questions?

2017 treeo - approval and type ii assemblies and type ii detector assemblies paul h. schwartz, usc...

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