Method Statement for Installation of Ahu Fahu

PROJECT NAME METHOD STATEMENT FOR INSTALLATION INSTALLATION OF AIR HANDLING UNITS & FRESH AIR HANDLING UNITS

Ref. No. : REV. No. 0 Date :

PROJECT NAME

METHOD STA STATEMENT FOR

INSTALLATIONOF AIR HANDLING UNITS& FRESH AIR HANDLING UNITS

PROJECT NAME Ref. No. :

METHOD STATEMENT FOR INSTALLATION OF AIR HANDLING UNITS & FRESH AIR HANDLING UNITS

REV. No. 0 Date :

REVISION RECORD

This cover page is a record of all revisions of the document identied above b number and title! "ll previous cover pages are hereb superseded and are to be destroed!

Rev. No.

Date

By

Chkd.

A!ova" #

De#$!%t%o ad Pa'e N()*e!# o+ Rev%#%o#

PROJECT NAME METHOD STATEMENT FOR INSTALLATION OF AIR HANDLING UNITS & FRESH AIR HANDLING UNITS


CONTENTS

,.- ,.- PURPOSE .- .- SCOPE /.- /.- REFERENCES 0.- 0.- DEFINITIONS 1.- 1.- RESPONSIBILITIES 2.- 2.- E3UIPMENTS 4.- 4.- PROCEDURE 5.- 5.- ATTACHMENTS

,.- PURPOSE 

This method statement is applicable for the Suppl # Installation "ir $andling %nits # &resh "ir $andling %nits for the pro'ect as mentioned in the Specications # "pproved Shop Dra(ings!

.- SCOPE





This method Statement shall cover the Suppl # Installation "$% # &"$% in line (ith pro'ect re)uirements as indicated in the "pproved Shop Dra(ings* specications # manufacturer+s instructions!

/.- REFERENCE ,!- .atest "pproved shop dra(ings intended for $V"C! ,!/ Specication0! ,!,ISO 122-0/223! ,!45ro'ect 6ualit 5lan ,!75ro'ect $SE 5lan ,!89aterial "pproval Re)uest references0"ir $andling %nits # &resh "ir $andling %nits

0.- DEFINITIONS 9ain Contractor 0 9E5 Contractor 0 565 0 5ro'ect 6ualit 5lan 5S5 0 5ro'ect Safet 5lan 6C5 0 6ualit Control 5rocedure $SE 0 $ealth* Safet and Environment 9S 0 9ethod Statement IT5 0 Inspection Test 5lan 6":6C 0 6ualit "ssurance : 6ualit Control Engineer! ITR 0 Inspection and Test Re)uest 9VR 0 9aterial Verication Re)uest 9"R 0 9aterial "pproval Re)uest "$% 0 "ir $andling %nit &"$% 0 &resh "ir $andling %nit

1.- RESPONSIBILITIES6  • • • • • •

Responsibilities for ensuring that the steps in this procedure shall be carried out are specied at relevant steps in the procedure0 5ro'ect 9anager Construction manager 6":6C Engineer Site Engineer $SE o;cer S<

1., P!o7e$t Maa'e! 

The (or= progress shall be carried out as per planned program and all the e)uipment+s re)uired to e>ecute the (or=s shall be available and in good condition as per pro'ect planned!  Specic attention is paid to all safet measures and )ualit control in



coordination (ith Safet Engineer and 6":6C Engineer and in line (ith 5S5 and 565!

1. Co#t!($t%o Maa'e! 

Construction 9anager is responsible to supervise and control the (or= on site!  Coordinating (ith 6":6C Engineers* Site Team # &oremen for all activities on site!  Control and sign all ITRs before issuing to Consultant approval!

1./ S%te E'%ee!         

The method of statement to the sstem shall be implemented according to the pro'ect specications and approved shop dra(ings! 5rovision of all necessar information and distribution of responsibilities to his Construction team! The (or= progress shall be monitored in accordance (ith the planned (or= program and he (ill provide reports to his superiors! The constant coordination (ith the Safet Engineer to ensure that the (or=s are carried out in safe (or=ing atmosphere! The constant coordination (ith the 6":6C Engineer for an (or=s to be carried out and initiate for the Inspection for the nished (or=s! $e (ill ensure the implementation of an re)uest that might be raised b the Consultant! E;cient dail progress shall be obtained for all the e)uipment and manpo(er! $e (ill engage in the (or= and chec= the same against the dail report received from the &oremen! The passage of all the revised information to the &oremen and ensure that it+s being carried out properl!

1.0 3A83C E'%ee! 9MEP:6          

The monitoring of e>ecutions of (or=s at site and should be as per the approved shop dra(ings and pro'ect specications! Ensure ITRs and 9VRs are being raised for activities in timel manner and inspected b the Consultant! $e (ill follo( and carries out all the relevant tests as per pro'ect specications! Obtain the re)uired clearance prior to Consultant+s inspections! Should ac)uire an necessar civil (or=s clearances and coordination! 6":6C Engineer (ill assist the Consultant Engineer: Inspector during Inspection! Chec= # ensure (or= is completed prior to o?er consultant for inspection! Coordination (ith site construction team! $e (ill assist the Consultant Engineer: Inspector during the inspection! Ensure all (or=s have been completed prior to raise inspection to the



consultant!

1.1

S%te Fo!e)a



The carring@out of (or= and the proper distribution of all the available resources in coordination (ith the Site Engineer on a dail basis!  Dail reports of the (or=s are achieved and coordinated for the future planning (ith the Site Engineer!  Incorporate all the 6":6C and Safet re)uirements as re)uested b the concerned Engineer!  9eeting (ith an tpe of unforeseen incident or re)uirement and reporting the same to the Site Engineer immediatel!

1.2 Sa+ety O;$e!   

      

The implementation of all safet measures in accordance (ith the $SE plan and that the (hole (or= force is a(are of its proper implementation! The implementation of safet measures is ade)uate to maintain a safe (or=ing environment on the (or= activit! Inspection of all the site activities and training personnel in accident prevention and its proper reporting to the Construction 9anager and the 5ro'ect 9anager! The site is maintained in a clean and tid manner! Ensure onl trained persons shall operate the po(er tools! Ensure all concerned personals shall use 55E and all other items as re)uired! Ensure ade)uate lighting is provided in the (or=ing area at night time! Ensure high ris= elevated areas are provided are barricade* tape* safet nets and provided (ith ladders! Ensure service area:inspection area openings are provided (ith barricade* tape* and safet nets! Ensure safe access to site (or= at all times!

1.4 Sto!e
Responsible for overall Store operations in ma=ing sure to store the material deliver to the site and =eep it in suitable area that (ill =eep the material in safe from rust and damage!  One (ho (ill ac=no(ledge the receiving of materials at site in coordination (ith 6":6C # concerned Engineer!

2.-

E3UIPMENTS &ollo(ing tools shall be arranged before starting the 'ob! a! Tool Ao>! b! 9easuring Tape! c! $ac= Sa( Alade d! Spirit .evel



e! Electric Drill 9achine f!

Step .adders

g! Threading 9achine h! Solvent Cement i! '!

Electric (elding machine! Bif re)uired Tor)ue rench

=! 5ipe Cutting 9achine l!

rinding 9achine

m! 5ressure auge n! $ammer o! ater .evel 9ar=er p! 9obile Sca?olds )! Staging 5latforms

4.-

PROCEDURE 

or= Se)uence:5rocedure

4., •

Gee!a" Re=(%!e)et# "ll the materials received at site shall be as per the approved technical material submittal and to be inspected upon receipt # approved b the engineer prior in proceeding (ith the installation through 9VR! "n discrepancies* damages etc!* should be reported to the supplier for

•

rectication or replacement# to be removed from site immediatel! "ll construction:inspection:testing (or=s shall be carried out in accordance (ith the specications # to be done b )ualied 9echanical Engineers and shall be chec=ed and approved b 9E5 Subcontractor Construction 9anager along (ith 6":6C Engineer! Contractor has to clarif the procedure for material deliver to the site through consultant Engineer at site!

4.

Mate!%a" T!a#o!t8 De"%ve!y •

•

"$% # &"$% units are normall shipped # despatch for goods condition and carefull loaded in containers (ith crating : bo>ing! $ence* in case of transit damage* supplier must be informed immediatel! Special care must be ta=en to ensure that units are oFoaded from containers! Rough handling can result in damage to aluminium frame(or= and double s=in panels! It is possible to lift the sections b



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slings or b for=lift! "ll the received units shall be chec=ed # inspected to ensure that it is compling (ith the approved material submittals prior to site storage!

4./ •

Sto!a'e o S%te Sto!e To ensure that deterioration of the "$% # &"$% does not occur during storage* it is recommended to store the e)uipment in sheltered conditions

•

that are protected from (eather elements and accidental damage! "$%s # &"$%s shall be protected (ith plastic: tarpaulin or shall not be

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removed from the shipping pac=age unless other(ise instructed to do so! "ll pac=ages for the e)uipment reaching the site shall be identied as per pac=age list!

4.0 Se=(e$e o+ I#ta""at%o +o! the AHU & FAHU 4.0., Sa+ety •

"ll site safet rules # regulations shall be complied (ith!

•

Supervisors (ill deliver tool bo> tal=s* relevant to these activities to all operatives involved in the installation and shall be recorded!

•

"ll operatives (ill be e)uipped (ith minimum personnel protective e)uipmentG hard hat* coveralls* safet boots* safet glasses!

•

The persons using cleaning Huid and solvent cement have to (ear hand gloves!

•

Ensure onl )ualied personnel shall install* test # commissioned the e)uipment!

•

During Testing # Commissioning* B(hich (ill be done on later stage displa (arning sign boards necessaril provided and barricade the area (henever necessar!

•

Onl competent* e>perienced # trained personnel shall perform all the re)uired activities stated in this method statement!

•

Ensure that all operatives full understand the method of these activities!

4.0. P!e> I#ta""at%o P!o$ed(!e 

Before commencement of installation activity, the supervisor must ensure that: Delivered AHUs & FAHUs shall have been inspected & approved via MV by the • •

•

consultant prior to installation at site! All "nstallations & #ressure $estin% of #ipe Duct 'or(s have been completed & approved by the consultant! elevant documents or certificates shall be presented at the time of inspection if re)uired



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by the *onsultant! #ermission to start or *ivil *learances prior to installation has been %iven by the main

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contractor! All relevant +hop dra'in%s for the installation of the e)uipment shall be available &

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approved by the consultant! o installation shall be done 'ithout Approved +hop Dra'in%s! "nstallation activities shall only commence 'hen all associated 'or(s by the *ivil such as

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clearin% of 'or( place, 'ater proofin%, etc! have been verified & completed! +afe access shall be provided by the Main *ontractor thru -or( #ermit in coordination

• •

'ith the +afety in char%e at site! "nspect the relevant area for any possible clashes 'ith other services! *hec( for other services, ma(in% sure that there is no interference bet'een each service & ade)uate access to 'or( and for future maintenance can be maintained!

7.4.3

Installation Procedure for AHU & FAHU

.nsure that ade)uate access e/ists for connectin% all supplies, disposal of condensate overflo's, inspection & maintenance and for replacement of rene'al parts such as filters, belts, bearin%s etc. "nstallation of units must be in accordance to the pro0ect specifications, approved shop dra'in%s, details, %ood en%ineerin% practice! +tructural base 'ith rubber pad for the units must be level & ri %id! Ma(e sure that the base is hi%h enou%h from the floor to allo' the installation of condensate drain 'ith necessary trap for easy flo'! 7.4.4

Assembly Bet'een the sides of the sections that shall be connected, it must be inserted a continuous • • •

foam %as(et for airti%ht seal! #ush the sections to'ards one another, ma(in% sure that they are lined up 'ith one another! *onse)uently the sections must be loc(ed to%ether by stainless steel bolts located in

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factory predrilled assembly holes into the corner brac(ets on the inside of the frame! Ma(e sure that they are firmly in position! ecessary steel bolts & foam %as(ets are supplied in a ba%, normally located 'ithin the fan

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section! $he re)uired anti vibration material to be installed belo' the unit & the re)uired slope of

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e)uipment of condensate drain to be considered! *hec( the hei%ht of foundation to achieve the unit condensate drain based on the .+#! "t must be noted that durin% installation and assembly, there is a possibility of

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misali%nment if individual sections are not carefully handled! Do not use e/cessive force to ali%n because it may deform the aluminium structural frame'or(! "f in any case that it is not possible to access the inside of the casin%, the connection can be

•

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made either by openin% an inspection door or by removin% a 'all panel! Free movement of all dampers must be chec(ed! Manually operated dampers can be ad0usted to obtain the re)uired airflo' by loosenin% the

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Ba(elite (nob and then turnin% the control lever! Ba(elite (nob must be ti%htened after settin% up at the desired location on loc(in% )uadrant! Motori1ed dampers are supplied 'ith the lin(a%e rod for connection to the actuator! "t must

•



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be ensured that the actuator motors are ri%idly fi/ed to the structural frame'or( of the unit and not to the double s(inned panels! *are must be ta(en to ensure that the actuator does not attempt to push the damper beyond fully open or fully closed positions! *hec( the )uality of filters is in accordance 'ith the dra'in%s! #anel Filters 'ith flat or corru%ated media are normally fitted 'ithin the unit prior to

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shippin%! Ba% Filters alon% 'ith pre2filters 3if any4 each housed 'ithin a special holdin% steel frame

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'ith necessary loc(in% sprin% to ensure proper sealin%! A ban( of such special frames 3)uantity depends on the type of air flo'4 is assembled 'ithin peripheral aluminium frame'or( of each Ba% Filter +ection! .ntire assembly alon% 'ith #re2filter must be l oc(ed 'ith four sprin%s to ensure no lea(a%e of air! Automatin% roll filters have t'o headers, one houses the clean spool, 'hile the other dirty

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spool, 'hich is driven by a %eared motor and chain drive actuated by differential pressure! ormally filter media are supplied loose for site installation! Filter media roll is mounted on the clean spool header, ta(en alon% the %uide channel throu%h 'or(in% section and loc(ed to the dirty spool! +'itch must be installed and connected to the control panel! Absolute filters are housed in a special purpose made of aluminium frame 'ith corner

•

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brac(ets & loc(in% devices for each cell! -hile assembly special care must be ta(en to ensure that each filter cell is properly seated 'ithin the assembly frame and perfectly sealed a%ainst the neoprene foam %as(et 'ith no possibilit y of lea(a%e! Heat ./chan%er *oils are lea( tested & chec(ed prior to assembly! Fins are chec(ed for

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proper condition prior to shippin%! Durin% installation they mi%ht be sli%htly bent and hence they must be chec(ed and combed out if necessary! Do not remove plastic protective covers from the header connections until the system is ready for hoo( up! +ystem lay2out should ta(e into consideration of possible coil 'ithdra'al! All connectin% pipe'or( must be properly insulated! -ater *oils system desi%n, pipe connections and valve arran%ement must be chec(ed! Flo'

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& return connections are clearly identified on the unit panels and pipe 'or( must be connected accordin%ly, preferably throu%h fle/ible couplin%s to avoid transmission of any vibration from the pipin% to coil! ./cessive ti%htenin% tor)ue mi%ht dama%e the coils! #ipe 'or( must be supported independently to the coil or to the unit! #lu%%ed drains & vents are provided for each coil and their use must be limited to the

• •

respective coil! $hey must not be used for drainin% or ventin% the other part of the system! +ufficient antifree1e chemicals must be added to the circulatin% 'ater in coolin% coils, 'hen there is a possibility of bein% e/posed to temperatures belo' 56*! "t is recommended that the 'ater flo' is s'itch off 'hen fan is s'itched off! *ondensate Drains: All chilled 'ater coils must be individually trapped and connected to drain 'ith ade)uate pitch for easy flo'! Dependin% on the ambient temperature and plant location, it is recommended to insulate the condensate drain pipe'or(! Supply & Return Fan Assemblies  Units are supplied 'ith neoprene or sprin% isolators on 'hich fan & motor assembly is suspended, are loc(ed prior to shippin% to avoid dama%e durin% transit! 7nce unit is in position and fan outlet is connected to duct'or(, sprin% isolator8s mounts must be released!  Fle/ible connection to be used bet'een units and supply return Fresh Air Duct!  *hec( the type & volta%e of motor! "f information is available, cable entry holes throu%h



the double s(inned panels can be factory drilled! .nsure that no holes drilled and no connections are made throu%h the access door! "t is recommended to use fle/ible armoured conduit bet'een the panel and motor terminal bo/! All conduitin% 'irin% must be carried out in accordance to pro0ect specifications & local standards!  *hec( the type of start 3direct on line star delta4 meets 'ith the local re%ulations! #rovide starter controls overload protectin% devices interloc(s as re)uired!  Duct'or( must be connected and insulated in accordance 'ith the pro0ect specification & approved dra'in%s! "t is also recommended to protect all linin% and attenuation materials 'ith smooth perforated metallic sheets to avoid mi%ration of fibres into occupied areas bloc(a%e and subse)uent replacement of filters fre)uently!  Belt $ension: $he belts must be correctly tensioned to ensure %ood contact 'ith the

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pulley! "f insufficiently tensioned, the belts may slip and if e/cessively tensioned, the motor may be over loaded! Heat Pipe Installations  Durin% installation, lift heat pipe asse mblies by holdin% the casin% and not headers or connections! 9ar%er coils may have specific provision for eyebolts or similar liftin% arran%ements!  -hen liftin% the heat pipes, it may be necessary to drill the casin% flan%es in order to fit eye bolts etc! for liftin%! "t is imperative that these holes are drilled in the side plates of the casin% rather than in the endplates!  "n order to prevent any possible dama%e to the tubes of the heat pipes, all liftin% must be via the side plates! $he side plates have turned2in flan%es for stiffness!  Horse shoe heat pipes are shipped 'ith transit plates bolted bet'een the side plates! $hese plates are intended to maintain the separation bet'een the t'o le%s of the heat pipe and to stiffen brace the assembly! $he transit plates should be left in the casin% until the final assembly procedure 'hereby coolin% coil is inserted bet'een the heat pipe le%s!  *ase'or( should be securely fi/ed prior to pipe'or( flan%es bein% made upon combined heat pipe coolin% coils!  -ater flo' is into the bottom connection and return from the top, thus assistin% in ventin% of the system!  $he coils are handed and should be connected in counter flo'! $he 'ater flo' connection is at the leavin% airside of the coil, and thusly the return flo's to the enterin% air side of the coil!  -hen ma(in% scre'ed connections for the coil, hold the header connection 'ith %rips! $he copper coil tubes may be bent or fractured if e/cessive strain is put on the headers!  Maintain a minimum of ;;mm %ap bet'een the leavin% face of the coolin% coil and the enterin% face of the heat pipes reheat sections!  .nsure that the e/ternal fins shall be of aluminium 'ith minimum thic(ness ;!


up to <= ma/imum under normal condition!  $o avoid air contamination, the pressures on the fresh air side shall be hi%her than on the return air side!  Heat recovery system shall be protected a%ainst any free1in% ris(!  +upport positions should be determined to provide a distributed support for the unit base and should not obstruct access panels or air 'ay connections!  Access for maintenance and inspection for the A* *oil is %enerally from the side of the units!  7nce assembled in position, sufficient free space must be available ad0acent to the unit for future inspection, maintenance, component service, repair, & connection of service! !ontrol System #Inte$ration %it '(S)  Units are available 'ith factory en%ineered controls as a >plu% and play? pac(a%e! $herefore, the units are provided 'ith components includin% control components 3sensors and actuators4 controller and po'er 'irin%!  .lectrical connections may become unti%htened durin% transport! All electrical connections should be chec(ed and re2ti%htened prior to installation commissionin%!  All electrical connections shall be made accordin% to the 'irin% dia%rams provided on the components or in supplied documents!  All the lo' volta%e end devices are factory installed on the unit and 'ired bac( to a central terminal strip 'here connections to BM+ controller can be easily made on site!  $he central connection module 'ill need to be sited so that there is ade)uate access to the control panel for commissionin% and maintenance purposes! $he minimum clearance is  meter 'ide and 5 meters hi%h!  Main connections are normally made throu%h the bottom of the control panel! All the cables should be suitably arran%ed so as not to put e/cessive strain on the terminals! $hey should be fitted 'ith suitable %lands to prevent 'ater in%ress!  Fire +i%nal 3optional4: $he AHU unit maybe interfaced to a fire alarm shut do'n by connectin% a normally closed contact to the desi%nated terminals! "f this is not re)uired the fire contacts are replaced by a lin(! e mote fireman8s override s'itches can be connected to allo' operation of the e/tract fan after a fire alarm has been actuated! -here a mi/in% bo/ is fitted, the e/haust air damper 'ill be driven to the fully open position 'hile the mi/ed air and fresh air dampers are driven closed! 7verride contacts can be connected to the desi%nated terminals! 5.,.

ATTACHMENTS

@!5! uality *ontrol #rocedure @!! "nspection & $est #lan @!C! "nstallation *hec( +heet for AHU @!

Method Statement for Installation of Ahu Fahu

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