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To lay down a procedure for the Duct Leakage Test Duct leak testing is to find out actual quantity of air leaking out through duct system and checkingthe same with standard leakage rate so as to confirm whether leakages in the system are within limits. 2
SCOPE:
This SOP is applicable for checking Air leak rate from G. I. Ducting. 3
PROCEDURE: The leak testing rig consist of a fan with fan motor, flow measuring arrangement, flow adjusting ,arrangement & magnehelic guage / PLC Control panel A] Testing using Analog Magnehelic Magnehelic Gauge & B] Using PLC Control Panel EQUIPMENT REQUIRED:
a) Blower with motor and Volume control damper b) Magnehelic Gauges 0 – 50 mmwc ….. 1 No. 0 – 100 mmwc ….. 1 No. c) Flexible Duct 3.1
Close all Duct Opening with temporary seals
3.2
Calculate the area of Duct in Ft 2 Note: The construction class of the Duct as per requirement in Pharma industry is not more than 3”. Hence Leakage class (CL) for rectangular duct is 12. (as per Table – 4.1)
Standard Operating Procedure Document Title Sop No.
Issue Date
April 2013
Effective Date
April 2013
Review Date
Nil
Rev
R0
Page
2 of 8
Procedure Duct Leakage Test BG/ES/HV/008/00
3.3
Connect the apparatus as per drawing Fig 3.1.
3.4
Connect Magnehelic gauge (0 – 50 mmwc) across orifice plate.
3.5
Connect high pressure port of 0 -100 mmwc Magnehelic Gauge in the duct and keep the low pressure port of the gauge open to atmosphere
3.6
Adjust Blower to require Static Pressure
3.7
Calculate the Leakage factor (F) by using the relation CL = F/P0.65 F = CL x P0.65 CL = Duct leakage class P = Testing pressure in inches of WC.
3.8
Calculate the allowable leakage by using the following expression Allowable leakage = (Area of duct in Ft 2 x F)/100
3.9
Note down the orifice and tube diameter.
3.10
Note down the Differential pressure reading across Orifice.
3.11
Refer table 1.1 and find out the actual Leakage through duct for the corresponding values of Differential pressure.
3.11.1
B] Using PLC Control Panal
3.11.1.1
Connect the Testing Blower to section of ductwork to be tested
3.11.1.2
Start the fan and adjust the flow so as to develop the static pressure in duct 25mm of wg or as per requirement
3.11.1.3
Check the measured leakage is within the permitted rate.
3.11.1.4
Maintain the test for 10 - 15min and check that the leakage rate has not increased
3.11.1.5
Record the test results/print the test results
3.11.1.6
If the leakages are above the permissible limits carryout rectification of leaks by Tightening the duct joints properly with nut-bolts, change the sealant
Standard Operating Procedure Document Title Sop No.
Procedure Duct Leakage Test BG/ES/HV/008/00
Issue Date
April 2013
Effective Date
April 2013
Review Date
Nil
Rev
R0
Page
3 of 8
Reseal the ducts wherever locations have been identified. 3.11.1.7 3.12
Repeat the procedure till you get the leakages within permissible limits. ACCEPTANCE CRITERIA:-.
a) For 2’’ testing Pressure leak rate should be Less than or equal to 18.8 CFM / 100 Sqft Duct. b) For 3’’ testing Pressure leak rate should be Less than or equal to 24.5 CFM / 100 Sqft Duct. c) For 4’’ testing Pressure leak rate should be Less than or equal to 29.5 CFM / 100 Sqft Duct. 3.13
Prepare check sheet for duct leak test as per attached format.
