Justification Document for the Chilled Water Piping Installation

7/25/2019 Justification Document for the Chilled Water Piping Installation

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PROJECT JUSTIFICATION DOCUMENT (PJD)

FOR THE CHILLED WATER PIPING INSTALLATION

JUSTIFICATION STATEMENT

Re-insulation of a condensing chilled water piping with deteriorated insulation. Toavoid the condensation of chilled water piping as a result of heat gain by the exposed

pipes from external sources, there must be proper insulation around the piping, so as to

restrict the heat transfer from the warmer temperature to the exposed surface of pipe.

Chilled water piping insulation works plays a significant role in the functionality and

the temperature control of the entire HVAC installations of any air-conditioning central

system. As such, there is need for proper and enduring insulation with adequate R-

value insulating material with other accessories alongside good workmanship on all

chilled water piping installation both on the supply and the return piping, including allfittings, valves, gauges, etc.

PROBLEMS/ISSUES

Worn out insulation on installed pipes due for replacement as this as resulted to

moisture condensation on the CHWPS & CHWPR, and if not quickly remedied will

eventually resulted to rusty pipes. These two occurrences/issues are expensive and

disruptive to the entire facilities.

SOLUTIONS

All damaged and worn out insulation either as a result of poor/aged installation are to

be immediately replaced.

WORKING PROCEDURE FOR EXISTING FACILITIES

• All equipment servicing the chilled water piping would be shut-off.

• All damaged or worn-out insulation on the chilled water piping would be strip-

off completely.

• All exposed chilled water piping would be inspected for rust to ensure no rust on

any of the piping network.

• If any part of the piping is noticed to have rusted, such affected areas would be

coated with anti-rust material before re-insulating the pipes.



• All the chilled water piping would be made clean and dry to ensure there is no

moisture and other foreign material before the commencement of the new

insulation.

•

All insulation material would be cut to diameter of the various sizes asinstalled/existing.

• Pipe insulation would be kept at dry & clean place.

• If pipe insulation is not dirty then can be installed, if pipe insulation is dirty,

clean the internal and external surface to reasonable free from other foreign

material.

• Before install insulation, the pipes should be tested and painted completely.

SLIP INSULATION

• Jointing between pipe insulation should be coated with adhesive, allow the

adhesive to set for 3 to 5minutes, before pressing the joints together.

SLIT INSULATION

• Slit insulation tube lengthwise on one side, for pipe up to 150 mm. dia. and snap

it over the pipe.

• Jointing between pipe insulation should be coated lengthwise slit surface and

butt joints with adhesive, allow the adhesive to set for 3 to 5 minutes, before

pressing the joints together.

SHEET INSULATION

• Use for large pipe above 150 mm. diameter, fittings, valves & equipment.

• In case of the thickness of insulation over 32 mm., the installation must use 2

layers of insulation

• Joint between insulation sheets should be coated lengthwise slit surface and butt

joints with adhesive, allow the adhesive to set for 3 to 5 minutes, before pressing

the joints together both 1st layers but the lengthwise slit surface and butt joints of

1st & 2nd layers shall not be the same position.

• QUALITY CONTROL



o Quality control works should be performed in the particular works as

described in the following.

• PIPE INSULATION DIMENSION & THICKNESS

o Pipe insulation dimension and thickness should be performed in

accordance with approved shop drawing.

• MATERIALS

o Armaflex sheet, closed cell expanded foam insulation with a calculated

thickness to retard heat gain and control condensation drip from chilled

water systems or

o

Polystyrene.o Aerotape.

o Adhesives Gum.

o Vapour barrier.

o Abro sealants.









PERSONNEL

• Qualified personnel with over two decades’ years of experience in ducting,

insulation and cladding.

Documents

Justification Document for the Chilled Water Piping Installation