changing the standards - hesnihesni.org/.../ashrae_updates_____imeg.pdfchanging the standards...
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CHANGING THE STANDARDSLegionella & ASHRAE updates
that affect your facility
JEFF BOLDT PE, LEED AP, HBDP
Principal, IMEG Corp. Member ASHRAE SSPC 90.1
Member ASHRAE SSPC-189.1 Member GPC-36
BRADICK YOUNG PE, LEED AP Associate, IMEG Corp. Corresponding Member ASHRAE TC9.6
AGENDA
• ASHRAE 90.1 • Green Codes
– 90.1+ – 189.1/IgCC
• Legionella • ASHRAE/ASHE 170 • GPC-36
90.1
SCOPE OF ASHRAE 90.1
• Energy conservation code for buildings, except low-rise residential – Envelope
– HVAC
– Service Water Heating
– Power & Lighting
– Other
• Cost Effective – Not driven to Net-Zero
HOW 90.1 IS ENFORCED? WHAT ABOUT IECC?
• EPAct 1992 requires DOE to review each version of 90.1 & require all states to have energy codes substantially equal to the latest ‘approved’ version
• DOE issues “Determinations” – Within one year – States are given two years to comply
(September 2016 for 90.1-2013)
TEMPERATURE ‘ZONES’ + ABC = 17 IN USA
2013 CLIMATE MAP
SCOPE ADDITION
• New equipment or building systems specifically identified in the standard that are part of industrial or manufacturing processes – Computer rooms are the first
application – Wording controversy
REHEAT
• 2010 requirements – No reheat allowed unless:
• ≤3020% of peak flow or • Flow no more than required air changes
– Bans CAV systems in most hospitals & labs – ORs only pressurized when unoccupied – “BX” restricts overhead air heat to 20°F
above room temperature – Supplemental heat may be needed
ECONOMIZERS
• 2007 • 2010 (cy)
DUCT SEALING (CQ)
• Ductwork and plenums with pressure ratings shall be seal class A
• Shaft openings require bushings • 25% of duct systems over 3” w.g. and ALL
outdoor ducts shall be leak tested – Tested sections chosen by owner
• Leakage class = 4 for all ducts
AHU HEAT GAIN
• In IECC 2012 • F&B Coils • Humidifiers
90.1 - OTHER EQUIPMENT
• Elevators – Lighting efficacy ≥35 LPW – Ventilation ≤ 0.33 W/cfm – Lights & fans off if unused for >15
min – 2013 – Escalators & fast-walks
• In IECC 2015 – 2016 – Elevator movement
efficiency IN DESIGN DOCS
UPDATES TO ASHRAE 90.1 – C-SE
ASHRAE 90.1
Are you up to date on 2013 and future addenda? Changes in ASHRAE Standard 90.1 -- both in the 2013 edition as well as in approved addenda in 2016 -- are explained in "Updates to ASHRAE 90.1" in the current issue of Consulting-Specifying Engineer. The article -- authored by KJWW's director of engineering, a Chicago architect and two senior researchers at the Pacific Northwest National Laboratory -- covers envelope, HVAC, plumbing, lighting, elevators and escalators. Read the story.
GREEN CODES
ASHRAE 189.1 AND IgCC
Are Green Codes Right for Your Community?
WHAT DO THEY COVER?
• In code language that communities can adopt: – Sustainable sites – Use less water: domestic, irrigation, HVAC – Reduce energy consumption – Improve Indoor Air Quality (IAQ), and – Reduce impact on local environment, atmosphere, materials,
and resources
• Basically all the LEED stuff
HOW IS LEED DIFFERENT?
• LEED = a program to promote the construction of more environmentally friendly and resource efficient building than typical construction codes and mandated product standards
• Promotes the use of sustainable products and processes
• Points system certified – silver – gold – platinum • Not intended as a CODE
WHERE ARE THEY HEADED?
• Unification of standards! • IgCC/189.1 = Eventually Soon prerequisites for LEED • One Standard to Rule Them All: LEED, IgCC,
189.1 to Be Parts of Single System – Building codes could harmonize seamlessly with LEED
certification as USGBC, ASHRAE, and ICC join forces. – The new framework could result in a greater number of
green buildings as jurisdictions find it easier to adopt green building codes, says Brendan Owens, P.E., vice president for LEED technical development at USGBC. What’s more, he says, it could mean more LEED buildings as well.
– http://archrecord.construction.com/news/2014/08/140822-One-Standard-to-Rule-Them-All.asp
Legionella
WHAT’S LEGIONELLA?
It’s Pneumonia
LEGIONELLOSIS = PNEUMONIA
• Most cases not diagnosed as LD • Legionellosis cases >3X in 10 years • Outbreaks create publicity and outcry
– ~4% of pneumonia cases • 8-18,000 cases per year in USA (CDC) • Usually develops 2-14 days after exposure • >10% of cases are fatal (CDC)
WHO IS SUSCEPTIBLE?
• Elderly • Smokers • Immunocompromised • Healthy people
– ~25% of cases have no risk factors
WHAT IF I HAVE LD?
• Legionella is a bacteria – Legionella Pneumophila, serogroup
1 – Some antibiotics are effective
• Levofloxacin = very effective • Penicillin = not very effective
SOURCES
• Must be inhaled • Potable water (#1 risk)
– Mainly HW – Is CW a significant risk?
• Pittsburgh VA deaths – so maybe…
• Warm water (cooling towers) – Less total risk, but more publicity – 13 deaths in Quebec (180 cases) – NYC deaths
TEMPERATURES FOR LEGIONELLA
Pre-188 Standards
ASHRAE GUIDELINE 12
• Being updated now • Free from several
cooling tower manufacturers
• Standard of Care • Most cases are not
outbreaks • Hot water should be
stored above 140°F & returned above 124°F
CTI Guideline 208 Best Practices for Control of Legionella
CTI – ROUTINE TREATMENT
• Feed Cl or Br – maintain 0.5-1.0 ppm as Cl2
• Effectiveness is reduced at higher pH – Chlorine is effective to 8.0 – Bromine is effective to 8.5-9.0
• Biodispersant/biodetergent may aid in penetration and increase efficacy
• Periodically use non-oxidizing biocides
CTI – DESIGN ISSUES
• Eliminate stagnant areas • System design engineers should provide
discharge piping and equalizers to move water with no dead flow locations. Special attention should be paid to equalizer piping to ensure these areas are not stagnant. – Short – Common pipe
AIHA
• Guidelines for recognition, evaluation, and control of Legionella
• American Industrial Hygiene Association • Discusses
– Routing (continuous) programs – Investigative Assessments
• Guideline – not a code or standard
NSF
• Similar to New York City rules • Opposed by CT manufacturers
ASHRAE Standard 188
PURPOSE
The purpose of this standard is to establish minimum Legionellosis risk management requirements for building water systems.
NOT A CODE, BUT…
• Written in mandatory language • NY City adopted sections 5, 6, and 7.2 • Now the most important standard of care (IMO) • 5 public reviews • Sections 4.1 and 8 include “Designer Requirements”
– IMO some are Owners’ responsibilities – Pending CMPs (3 so far)
SCOPE
• Potable water systems • Non-potable water
systems • Ornamental fountains • Whirlpools and spas • Humidifiers
PROGRAM & PROGRAM TEAM
• A Program utilizing the risk management principles in the following subsection shall be used to reduce the risk of legionellosis …
• Identify the persons on the Program Team responsible for developing and implementing the Program and the tasks for which they are responsible. – When???
• Often the team is established after all design decisions were made
PROGRAM FLOW DIAGRAM
INSTALLATION DRAWINGS
Drawing of distribution system including monitoring points for temperature, sampling points, and treatment points
DISINFECTION
Potable water disinfection must be within three weeks of beneficial occupancy.
OWNERS
• Primary responsibility • Plans for regular activities • Emergency plans • Program Team decides about water testing
– If – How often – Which water – Criteria
Testing
TESTING
• Flush outlets before sampling? – Study – Janet Stout et al
• Recommends not flushing – Represents what user does – Flushing reduces counts
• Sample size – 100-200 ml (3-6 ounces) is enough
• Less shipping/handling than 1L – Bottles from lab have neutralizer to remove Cl – Ship in insulated containers
SAMPLE SHIPPING
• Does shipping time affect results? – 2014 study by Dana Flanders et al
• Tested samples immediately and after 24 hours • Minimal difference in results
– Study by Janet Stout et al • Multiple sites • 0, 1, 24, 48 hours • No change at 24 hours – 2% at 48 hours
• Some labs ship with culture nutrients in containers
DIP SLIDE
• Total count only • Note the numbers
MOLECULAR METHODS - PCR
• CDC – “Use of PCR for identification of Legionella is not recommended until more
data regarding sensitivity and specificity of procedures are available.”
• Progressing – Nested Enzymes
PICKING A LAB CDC ELITE LAB
• Culture Methods - Proficiency Standards – ISO 11731 (parts 1 &2) – ASTM D 5952 – International – HSE L8 ACP 2013
• Labs use different methods – Pretreatment, filtration, culture media – Nutrients, inhibitors – Presumptive agglutination or definitive sequencing?
• CDC ELITE labs is IMO a minimum – Not all equal – Variations in duplicate samples
WHERE TO TAKE CT SAMPLES
From the basin is most representative
PPE FOR PEOPLE TESTING?
• No requirement • Maybe advisable if power washing CT • Maybe advisable if going into CT known to have LD
HOW MUCH LEGIONELLA IS ACCEPTABLE?
• Zero is good, but generally not believed necessary • 58 named species • Half implicated in human disease • Worry about pneumophila, serogroup 1 • 65% of studied hospitals tested positive • >1,000 CFU is probably trouble • Program Team decides
CDC RECOMMENDATIONS FOR CLEANING INFECTED TOWERS
Plumbing
PLUMBING – VA
• VHA Directive 1061 • Covers LD and scalding
PLUMBING – IMEG
• Generation: IMO only 140°F complies with Std. 188
• Distribution: depends on risk – 140°F or 120°F
What About My New Buildings?
CHEMICAL TREATMENT
• Alternating Dual biocide – Oxidizing + Non-oxidizing – Bromine +Quaternary Amine (tested well) – Probably Chlorine + Quat (not in test)
• ASHRAE RP-1361 – All non-chemical methods were ineffective
• Magnetic • Electric pulsed, Electric static • Ultrasonic • Cavitation
TEST WATER
• Establish baseline during maintenance period • Test for Legionella Pneumophila, Serogroup 1 • Periodic testing
– Best = send cultures to CDC Elite lab – Dipslide or pen gives total count – non-specific to Legionella – PCR = tells if Legionella SG1, but not the quantity
MAINTENANCE STAFF
• Minimize time inside towers – Direct drive to eliminate belt/gear maintenance – Fans/Motors with external maintenance
BUILDING OCCUPANTS
• Maximize distance to OA intakes – Consider prevailing wind (odds)
SPEC ITEMS – COOLING TOWERS
• Circulate water and treat with biocides >6 hours before fans start
• Run fans slowly after water flow stops • Nested “high efficiency” drift eliminators
– Nested = tongue and groove
• Include sidestream filters (type?)
DOMESTIC WATER
• 77°F maximum CW temperature? – Guideline 12 mentions this, but not 188 – VA has requirements
ASHRAE Standard 188
What’s My Risk? Higher? L Lower? J
JEFF’S OPINIONS
• If you address 188: Risk goes down relative to other facilities J
• If you don’t: Risk goes up – A LOT L
• Much more attention to LD today, so IMO in general risk is higher
IMEG’S TEAM
• Established an internal “Program Team” • Drawings & Specs
– Plumbing – HVAC – Commissioning – Contracts
• 11 meetings – so far
THOROUGH APPROACH
170
ASHRAE 170/FGI
• 170-2008 – New ASHRAE Standard – Updated from AIA Guidelines
• FGI-2010 – The 2008 edition of ANSI/ASHRAE/
ASHE Standard 170: Ventilation of Health Care Facilities – including all issued addenda – is incorporated into the 2010 edition of the Guidelines for Design and Construction of Health Care Facilities
– Addenda to 170 reduced RH to 20%
ASHRAE 170/FGI
• FGI-2014 – Acoustics MUCH improved
• Kaiser Permanente – Rejected 170/FGI ventilation rates,
except where required by law (OR, Isolation)
– Recommend 62.1 for IAQ – Recommended 55 for comfort – Current discussions with ASHRAE
170 PROPOSALS
• Adiabatic cooling allowed – This passed
• Zero ventilation in many unoccupied spaces – Including patient rooms – This also passed
• Split in Ventilation Tables for – Hospital – Outpatient – Residential
• Resistance to requiring 170 for last 2 categories
GPC-36 Controls
GPC-36 CONTROLS
• Standardized Control Sequences • Three Benefits
– Specify “ASHRAE Sequence XX, except…” • Shorter specs • Bidders know cost • Bidders deliver what was specified
– More detailed with fault detection • Like your car, but with more characters
– Operating staff understand controls in many buildings