SPECIFICATION V

DUCT ISOLATION In general, duct hangers are limited to a 50 foot(15m) requirement from the fans as the vibration becomes minimal as the air flow smooths out. Deflections are limited to 0.75” (19mm) as these are light capacity supports, and we are isolating sheet metal resonance rather than the fan’s primary disturbing frequency. We continue…

SPECIFICATION U

RISER ISOLATION thermal expansion or contraction is a minor issue. It is often possible to solve the problem by providing a single basement support and guides at the midpoint and roofline. If thermal motion is larger, an isolator in the center of the structure will allow for half motions in both directions. The application is…

SPECIFICATION R

PIPE ANCHORS In the 1982 publication we used our all directional anchor for anchorage or anchoring the ends of oversized clamps that allowed piping to slide within the clamps. If the pipe was insulated, the clamps guided steel bars, welded to the pipe that protruded through the insulation. Those methods were a step forward. We…

SPECIFICATION T

VSG Riser Guides The hanger, mounting and anchor discussions on the previous pages include explanations of the various commodities and the reasons for their design. We have called for deflections in the first four supports to be equal to that of the equipment as these locations often require capacities that are as great as the…

SPECIFICATION S

VSG Riser Guides In 1982 we showed sliding guide locations using anchors under the ends of oversized pipe clamps around the pipe or steel guide bars welded to the pipe. This was difficult because of the need to weld the sliding bars to the pipe exterior and we found oversized clamps were not readily available.…

SPECIFICATION Q

WALL, FLOOR AND CEILING SEALS The space around pipes passing through wall, floors and ceilings is often packed with fibreglass and caulked to prevent sound transmission. Efficiency is too dependent on field conditions and supervision. We suggest a factory fabricated split seal clamped around the pipe with closed cell neoprene sponge as the filler. The…