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...
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 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...
Square to round transition pieces are used at the end of duct branches to connect flexible ducting which then goes to the diffuser. Alternatively, a round dovetail joint neck is connected to the bottom of the duct to which the flexible duct connects that then connects to the plenum box of the...
The question is about how much energy saving would result by insulating with HDPE the 3 inch dia CPVC Pipe buried in ground at a depth of 3 feet that transports domestic hot water at 60 degrees celcius from a central plant to the various buildings of the project and the water is then...
The specs call for acoustic liner for 3 meters of duct connected to equipment. Applying acoustic liner internally in the small sizes of duct that are within 3 meters of fan coil units is not convenient. Can sound be attenuated by applying the acoustic insulation on the outside of the ducts given...
Is there a preference for outside drop versus inside drop and if it is the outside drop can the PVC vertical pipe be encased in concrete instead of backfilling around it with gravel? I have seen the pipe encased in codes and details of many localities and yet one manufacturer is clearly...
The question is about the minimum acceptable gauge thickness for sleeves used to house the fire damper which is then secured to the fire rated wall using angles bolted to the sleeve on all four sides.
For UL Listed Type B Fire Dampers, the minimum gauge thickness of the sleeve must be the same...
For UL Listed Type B Fire dampers (in which the fire damper mechanism in the Hat section extends on the top whereas all its other three sides inside the sleeve are the same size as the duct. As per standards for type B, the minimum gauge thickness of the sleeve must be the same as the gauge of...
Is it permissible to use regular fire hose cabinets (having non collapsible rubber hose reels or those equipped with collapsible fabric pipe rack in patient's residence of psychiatric hospitals or are there additional safeties lockable cabinet etc.), that are required by the code to make the...
For Type B Fire dampers (in which the fire damper mechanism in the Hat section extends on the top whereas all its other three sides inside the sleeve are the same size as the duct. As per standards for type B, the minimum gauge thickness of the sleeve must be the same as the gauge of the duct to...
The attached photos show the floor drain/gully to which bath tub, shower tray, fan coil unit condensate drain, lavatories and bidet are connected. The distribution of the fixtures is such that necessitates the use of 45 degree bends to reach the floor drain. The question is whether there is any...
If the drain line from the fan coil unit condensate discharge is equipped with a P-Trap to prevent sewer gases from entering the occupied space, why is it still objectionable to discharge the condensate in the vent pipe of a lavotory that is part of the DWV system?
Before the waste pipes exiting from a building are connected to a manhole, why is a gulley trap required, especially when all the fixtures are provided with p-traps that prevent sewer gases from finding their way into occupied spaces? Does the gulley trap amount to a double p-trap which violates...
The underground waste pipe (coming from lavatories) exiting from our building is right in front of the building entrance that has stairs and a ramp. The drawings call for this pipe to be connected to a gulley trap which in turn is connected to the soil drainage manhole that is also right in...
