A solid disk inserted at a pipe joint or union to prevent the flow of fluids through the pipe; used during maintenance and repair work as a safety precaution. Also known as blank.

Related Terms


For the purposes of NSCV Part B, all persons who: a) have knowledge of safety procedures and handling of safety equipment on board; b) are not passengers, or members of the crew, or children under one year of age; c) are carried on board in connection with the special purpose of that vessel, or because of special work being carried out aboard that vessel; and d) are able bodied.


An induction of boiler water caused by the steam flow into the steam line. The water may be in the form of a spray or a solid body.


The chemical union of two or more molecules of the same compound to form a larger molecule of 1 new compound called a polymer. By this mechanism the reaction can become self-propagating causing liquids to become more viscous and the end result may even be a solid substance. Such chemical reactions usually give off a great deal of heat.


The flow velocity of one phase of a multiphase flow, assuming that the phase occupies the whole conduit by itself. It may also be defined by the relationship (Phase volume flow rate / Pipe cross-section).


A solid body of boiler water passed into the steam flow by priming or picked up from a pocket of condensate in the steam line.


(TML) - refers to the maximum amount of moisture allowable in a shipment of granular (dry bulk) material in order to keep it from acting like a liquid when external force such as the rolling of a ship is applied. These limits are listed in The Code of Safe Practice For Solid Bulk Cargoes Also known as the BC Code. This code is adopted as part of the SOLAS Convention. This limits are derived from a prescribed test of the material to determine the Flow Moisture Point.


  1. Cutting and fitting panes of glass into frames. 2. Smoothing the lead of a wiped pipe joint by passing a hot iron over it.


The flow velocity of a multiphase flow. It may also be defined by the relationship (Multiphase volume flow rate / Pipe cross-section).


A pipe in a compressed-air piping system that is used to displace trapped air so that the condensate can flow freely into the trap.


An instrument in which fluid in a pipe is made to rotate at a constant speed by a motor-driven impeller, and the torque required by a second, stationary impeller to straighten the flow again is a direct measurement of mass flow.

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