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The value 3.14D or πD may be read in the circumference column of the above table. Visual inspection for application of such proper methods will ordinarily suffice for verification of reasonably tight construction. Pipe wall deflection references the ability of the pipe to move from a circularcross-section to an oval configuration under a given stress level generated by the applicable external loads.You may wonder how that can be considering 30” and larger have pressure class ratings as low as 150. Structural grade adhesive systems are being developed to replace spot welded and soldered connections of metals.

Round duct joints are normally easier to seal than other types. They have lap shear strengths of 1000 to 5000 psi (6895 to 34475 kPa) or more.

in openings in a section of duct and connecting a blower and a flowmeter to the specimen in such a manner that pressurizing the specimen will cause all air escaping from the specimen to pass through the flowmeter. The easiest thing to do is to determine the wall thickness requirement for your application and then refer to a chart like the one below.For each class increase for pipes 24” and smaller, a 0.03” increase in wall thickness was included. Application over uncured sealant may have failures related to the release of volatile solvents. of duct would mean an unrealistic leakage factor of 1.5 cfm/100 s.f.

Under any circumstances reasonable allowances for leakage must be adopted because no duct is absolutely airtight.AGA, American Gas Association, Arlington, VAAlternative Calculation (as in Appendix A)Application of the information and guidance herein should facilitate design, improve system performance and reduce the difficulty of testing and balancing newly installed systems. All rights reservedView the different joints and sizes we offer for ductile iron pipe.Now that we’ve had a little history lesson, you probably want to get to the meat of the discussion and learn how to determine the correct wall thickness to specify for a given scenario.A clear vision from our leaders, places environment, health and safety at the core of our business.Our sales team strives to exceed customer expectations every day.Two factors to consider when deciding what wall thickness, and therefore correlating pressure or thickness class, for your specific need: The hot melt type is normally a shop application. The tape’s adhesive may be chemically incompatible with the substrate, as is apparently the case with certain nonmetal flexible ducts. Selecting sealing systems for such ducts may involve more attention to the final appearance of the duct system than with ducts in concealed spaces.Verification of compliance consists of testing sections of duct at the specified pressure level, finding the leakage in cfm and comparing this with the allowable amount associated with the leakage class. SMACNA is not able to comprehensively define their characteristics at this time; however, authorities are encouraged to monitor their development progress and consider their use.The duct will be constructed for some pressure class (or classes). Arbitrary assignment of an allowable % of leakage in disregard of these factors can indicate unobtainable results. The greater the difference is, the greater the difficulty will be.

is read.When the designer has adequately analyzed the systems and clearly specified the test parameters the reporting procedure is relatively simple. Few ratings for this are published. If the calculated value is below the value suggested in Table 4-1 the contractors should anticipate some difficulty in obtaining satisfactory test results. Where metal clearances exceed 1/16 inch (1.6 mm), several applications may be necessary to fill the voids caused by shrinkage or runout of the sealant.
Recalibration is not necessary. With 30 cfm in a 1″ diameter orifice,1.1″ to 2″ wg maximumCLASS 48 IS AVERAGE UNSEALED RECTANGULAR DUCT. The Association prescribes acceptable use of the logo and expressly forbids the use of it to represent anything other than possession of membership. The surface area basis highlights the effect of system size and is now the keynote of new SMACNA duct leakage classifications. U-tube manometers should not be used for readings less than 1″ of water.The new SMACNA Leakage Classifications are based on this leakage factor relationship.

Ductwork static pressure is figured as friction loss per 100 feet of duct at a certain CFM.