Can it be concluded from response of cry22 that a sleeve of 24 gauge is allowed by SMACNA for ducts of 24 gauge to which it connects by means of breakaway connectors?
The meaning and methods of breakaway connectors is also pending. The drive slip (C Cleat that is a sort of clamping type...
Above response (from cry22)implies that in fire rated walls there is no insulation. We were planning to provide expandable fire protection jacket that is intended to fill the void created by burning out of insulation during fire. But if there is no code requirement we will certainly omit this...
What about walls that are not fire rated nor part of fire zones? If ordinary mortar is used there would be no issue with the Authority Having Jurisdiction. However, mortar will fix the pipes rather rigidly in the wall. Would such afixation defeat the purpose of sleeves that are two diameters...
To decide how much of the duct to take down for lining it, the question arises about the minimum recommended lenght of supply and return ducts that must be provided with acoustic liners for both the Air Handling Units and Fan coil units.
Furthermore, is it very important or effective in...
Pipe Sleeves that are two diameters bigger than pipe are provided during construction of walls to enable subsequent piping work without breaking or coring. The gaps or space between the sleeves and pipes are then closed with sealants suitable for fire or non fire rated walls. The fire rated...
Iken seems to have hit the nail on the head, because if the duct gauge is 24 (and it duly conforms with SMACNA as per duct size and pressure class) the sleeve of gauge 24 appears flimsy and might just melt away. To wrap up the issue it would be useful to have black and white answers about the...
By manual air vent do you mean just a valve that you open to release the air? If that is the case, water is likely to come out of it when operated to see if there was any air. Manually opening AAVs at each offset would be quite a task. Even if the air vents spit they would do so only when there...
Figure 6.2 of this UL555 allows the duct connection with flat drive slip. This is enigmatic, because the connection of duct to sleeve does not remain breakway if jointed by drive slips on two verticle sides.
The breakaway connection is to enable the duct to detach from the sleeve without...
I think there is some miscommunication about terminology. I understand that Double Regulating Valves are the same as Balancing Valves, which simply put is to pump the flow rate of water in the branches as per the GPM requirements of fan coil units. Pre-setting or not is a detail that I am not...
The closed loop piping network, such as that of chilled water system usually has an Air Separator in the Pump Room. Furthermore, Automatic Air Vents are provided at the highest points (Pipe Risers) to expel air before it even reaches the Air Separator. Sometimes the horizontal piping must be...
Black Steel Pipe with threaded fittings is specified for valve package of fan coil units that includes shut off valves, strainer, 3 way valve, balancing valves etc. There is a dielectric union in both the supply and return piping at the point of connection with the copper coil of Fan Coil Units...
The shop drawing detail shown for fan coil units and air handling units depicts the balancing (double regulating) valves on the return. But another balancing valve on the branches coming from the main and supplying chilled water to 3 or more fan coil units is shown installed on supply pipes and...
The specs call for 1 inch thick glass wool insulation with aluminum foil vapor barrier for chilled and hot water networks inside the building and 2 inches insulation with aluminum cladding for external above ground piping. For better adherence to pipes, would there be any issues if the...
Double Regulating valves provided in chilled water branch lines for balancing and achieving systems flows are sometimes seen on supply and sometimes on return piping. Is there a strong technical reason or preference for locating them on supply or return? Do these work equally well regardless of...
