The annular gap widths of the enclosures have to be minimum to resist natural convection so that the heat load to roof slab cooling system is low. Narrower gap widths are also preferred to have compact layout and smaller size of roof slab.

Apr 4, 2022 · #1: Mind the annular gap. The annular gap or space is the clearance between the penetrating material (e.g. cables, cable trays, or pipes) and the inside edge of the penetration opening. The clearance depends on the size and shape of …

The clearance between inner and outer pipe in double-walled systems or between pipe and shaft or brick chimney is referred to as an annular gap. This can be insulated, filled with insulation material and can be operated dependent on room-air. …

Dec 20, 2023 · Annular gap grouting represents a crucial technique in modern construction, primarily focusing on filling the space between a host pipe and a carrier pipe or liner. This process involves injecting a specially formulated grout into the annular space, ensuring the stability and structural integrity of the piping system.

Apr 22, 2020 · The absence of those ingredients allows the liner to maintain its physical dimensions that prevent groundwater from tracking behind the liner in this "annular gap."

Aug 3, 2022 · The annular gap flow has some special turbulence structures. Shcherba et al. pointed out that the annular gap flow would be a laminar flow only if the gap width and pressure were extremely minor. However, for mostly hydraulic machines, the annular gap flow is turbulent flow, and its type is Reynolds turbulence .

Sep 6, 2018 · Annulus refers to the region or space between the borehole or tunnel wall and the surrounding ground. An annular gap is created by the shield of the tunnel boring machine (TBM) or the drill bit of a drilling machine during the boring procedure.

Dec 3, 2020 · It is crucial that the annular gap created by the drill head or the shield is immediately filled with bentonite. The bentonite fills the annular gap and reduces the skin friction by not only acting as a lubricating film but also by supporting the surrounding soil.

The annular gap or space is the clearance between the penetrating material (e.g. cables, cable trays, or pipes) and the inside edge of the penetration opening. The clearance depends on the size and shape of the opening and the penetrating material.

It is basically the gap. More specifically it is the distance from the inside edge of the opening to the outside edge of the penetrating item. It is actually a critical and often overlooked part of a firestop assembly.