Insulation7.4.Thermal InsulationContents7.4.1 What is my loss
due to uninsulated
surface?.........................................................2Case
Study-1........................................................................................................
27.4.2 Which insulation material to
select?.....................................................................47.4.3
What all surfaces should I
insulate?.....................................................................87.4.4
Which cladding material should I
select?............................................................117.4.5
Why economic thicness of
insulation?..............................................................127.4.!
What should "e my insulation
thicness?............................................................15Case
Study-2......................................................................................................
157.4.7 #o$ do I chec health of my
insulation?.............................................................19Case
Study-3......................................................................................................
197.4.% What should "e the surface tem&erature for
&ersonnel &rotection?.........................217.4.'. (e$
technologies in thermal
insulation..............................................................21Page
1 of 21Un-insulated pipeInsulation7.4.1 What is my loss due to
uninsulated surface ?Case Study-1Consider the heat losses through
!) *1!7mm+ diameter steam line of 1m length carrying steam at 7
"arg &ressure. ,n un-insulated steam &i&e $ould result
in 25- .cal/hr m of heat loss.0ro&er insulation of steam lines
can result in reduction of losses u&to '-1 as$ell as reduction
in surface tem&erature to a safer le2el. 3or the same
e4am&le as a"o2e5 the heat loss increases su"6ect to surface
tem&erature5 the trend is ta"ulated "elo$7Page 2 of
21InsulationSurface TemperatureBare pipe temperature= 17 oCTam! "#
oCTam! " 1$ oCTam! " 1# oCTam! " %$ oCTam! "&$ oC'eat loss (
)*cal+hr m,25- 2! 37 5- !- %-Insulation thic*ness )mm,(one 22- 11-
7- 5- 3-,m"ient tem&erature 8am"93- oC,nnual loss due to
un-insulation for a 3: fired "oiler *;C>3or a 1-- m &i&e
it $ill mount to loss of 15.5 ?ahs>Page 3 of
21Insulation050100150200250Insulation thickness (mm)Insulation
thickness (mm)050100150200250300Heat loss Q (kcal/hr m)Heat loss Q
(kcalh! m)8hus5 thermal insulation5 "y retarding heat flo$5
deli2ers the follo$ing "enefits7 @nsures steam Auality "y reducing
condensation of steam in the lines ?o$er radiation losses i.e.
lo$er distri"ution losses reducing o2erall cost of o&eration "y
cutting do$n fuel consum&tion ;i2es "etter &rocess
tem&erature control5 "y reducing the tem&eraturedro& of
the fluid in a heated system. 0re2ents safety haBards of scalding
"y lo$ering the e4&osed surface tem&eratures of steam lines
and additionally reduces the o2erall am"ient $oring
tem&erature. 0ro2ides fire &rotection to &lant
&i&ing =educes noise ,"sor"s 2i"rationPage 4 of
21Insulation7.4.% Which insulation material to select?8he follo$ing
ma6or insulation material used in thermal installations $ith
a&&lication tem&eratures7Sr.(o.Insulation
material,&&lication 8em&eraturesStandard densities
*.g/m3+,&&lications (otes1 8hermocol *0olystyrene+C&to
75 oC 2%53253%545Cold storage5=efrigeration?o$ cost5 non to4ic5
resistant to $ater &enetration5com"usti"le2 0C= *0olyurethane
3oam+ -1%- to 11- oC3554-55- Cold storage5=efrigeration?o$ cost5
com"usti"le3 (itrile ru""er -4- to 11! oC !-5'- Cold
storage5=efrigerationcom"usti"le4 CalciumSilicate1-- to 1--- oC24-
used forinsulation for"oilers5ducting and&rocess
&i&e$or. ,lsoused forrefractory.In-organic5 non
com"usti"le5 $ater a"sor"ent5 =oc Wool-2-- oC to '-- oC.!- to 1!-
Insulation of Doilers5 8aners5 #eat @4changers5
