Previous in Forum: golf ball   Next in Forum: Is burnt organic matter carbon?
Close
Close
Close
4 comments
Member

Join Date: Aug 2008
Posts: 5

Insulation for Chilled Water Lines

11/08/2008 7:38 AM

What is the best option for insulation of chilled water lines which have longer life even in humid environment.

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
Guru
Engineering Fields - Environmental Engineering - New Member APIX Pilot Plant Design Project - Member - New Member

Join Date: May 2007
Location: Anywhere Emperor Palpatine assigns me
Posts: 2774
Good Answers: 101
#1

Re: Insulation for Chilled Water Lines

11/09/2008 2:16 AM

Usually PU foam is used.

__________________
If only you knew the power of the Dark Side of the Force
Register to Reply
Power-User
United States - Member - US Navy Veteran

Join Date: Mar 2007
Location: Nothing sucks more than that moment during an argument when you realize you're wrong.
Posts: 301
Good Answers: 22
#2

Re: Insulation for Chilled Water Lines

11/09/2008 8:52 AM

There are established and proven methods that work well on indoor, outdoor, hot, cold, humid, very wet, and very dry applications or all of the above.

Start with this site https://www.iiar.org/ IIAR has several manuals and papers written on this topic the site also has a link to Extol http://www.extolohio.com/ A good contractor will figure it all out for you but YOU must ensure they don't cut any corners.

Extol fabricates and distributes Styrofoam, Isocyanurate, Cellular Glass, Perlite and Phenolic insulation for piping and equipment. Complete valve system, contoured heads, fittings, PVC, aluminum, vapor and weather barrier caulks and coatings. Extol also provides specification assistance. Extol offers materials for refrigeration, chilled water, steam and process systems.

__________________
You never know when it will strike, but there comes a moment when you know that you just aren't going to do anything productive for the rest of the day.
Register to Reply
2
Power-User
United States - Member - US Citizen - Born & Raised Engineering Fields - Control Engineering - HVAC/R Simplified Using PLC Controls Engineering Fields - Instrumentation Engineering - HVAC/R Simplified Using PLC Controls Engineering Fields - Energy Engineering - HVAC/R Simplified Using PLC Controls

Join Date: Mar 2007
Location: Brick, NJ (USA)
Posts: 110
Good Answers: 5
#3

Re: Insulation for Chilled Water Lines

11/09/2008 10:34 AM

I am having the same difficulty at a site in Maryland. I struggled with convincing the owner to invest in the proper insulation, and failed. I hope you have better luck!

Found this on the US Veterans Administration web site:

PIPING INSULATION

ISSUE:

Cellular glass insulation for chilled water piping in humid climates.

BACKGROUND:

On December 24, 1997, Office of Facilities Management (FM) published a Design Alert FM-187C-DA81 'Insulation for Chilled Water Piping' recommending use of cellular glass insulation in humid climates, and revised VA Master Specification Section 15250 accordingly. For some reasons, the designers on several projects have not specified cellular insulation, and this can cause serious problems in the future.

DISCUSSION:

1. Relative humidity exerts intense water vapor pressure on the insulation. Therefore, this makes impermeability the most critical criteria for insulating material for chilled water piping in humid climates. The other important properties to consider are, flame and smoke spread, compressive strength, and thermal conductivity. Just 4% moisture by volume in insulation can reduce efficiency by 70%. Wet insulation is a ready medium for mold and mildew growth. ASHRAE recommends a permeability of 0.10 or less for chilled water systems.

COMPARISON OF INSULATION PROPERTIES

(Based on values from manufacturers literature)

PropertiesCellular glassFiberglassPhenolicElastomeric
Permeability

Perm-inch

0.0075.000.120.10
Flame & Smoke

ASTM E-84

5 & 025 & 5017 & 1925 & 50
(pH)7.0 – 8.5NA1.4 – 5.2NA
Compressive Strength (psi)100.001.925.02.0 – 5.0
Thermal Conductivity

Btu-in/hr.sq ft. degrees F

0.320.230.130.27

2. Approximate Costs: Fiberglass is the cheapest. Cellular glass costs 45% more than fiberglass, elastomeric costs 50% more than fiberglass, and phenolic costs 55% more than fiberglass.

recommendations:

1. Specify only cellular glass insulation for chilled water piping in humid climates.

2. Access latest VA specification section 15250 on insulation @ web site

http://www.va.gov/facmgt/standard/index.asp

for additional information:

Contact Satish Sehgal (181A) at 202-565-5032

__________________
"Memorize the calculations, you look like a fool searching your notes while teaching class"
Register to Reply Good Answer (Score 2)
Member

Join Date: Aug 2008
Posts: 5
#4
In reply to #3

Re: Insulation for Chilled Water Lines

11/09/2008 11:20 AM

Thanks a lot sir for your guidance.

Register to Reply
Register to Reply 4 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
Copy to Clipboard

Users who posted comments:

AQamjad (1); DVader1000 (1); jcchiefeng (1); markar (1)

Previous in Forum: golf ball   Next in Forum: Is burnt organic matter carbon?

Advertisement