| Term |
Definition |
|
| Back reamer |
A cutting head attached to the leading end of a drill string to enlarge the pilot bore during a pull-back operation to enable the carrier or sleeve or casing to be installed in. |
| Backfall |
Refers to a length of pipe having an upward gradient opposite to the direction of flow. |
| Backfill Density |
Percent compaction for pipe backfill (required or expected). |
| Backflow device |
Mechanism that prevents wastewater from flowing back upstream. |
| Backstop |
Reinforced area of the entrance pit wall directly behind the track. |
| Band |
A ring of steel welded at or near the front of the lead section of casing to cut relief and strengthen the casing. |
| Baroid |
Proprietary equipment to measure the density of annulus grout. |
| Barrel |
The vertical section in a manhole between the cone and the benchwall. |
| Base |
The slab structure which supports a manhole. |
| Base (course) |
A layer of specified or selected material of planned thickness, constructed on the subgrade (natural foundation) or subbase for the purpose of distributing load, providing drainage or upon which a wearing surface or a drainage structure is placed. |
| Base Resin |
Plastic Materials prior to compounding with other additives or pigments |
| Base track |
See master track. |
| Batter |
The slope or inclination from a vertical plane, as the face or back of a wall. |
| Bedding |
A prepared layer of material below a pipeline to ensure uniform support. |
| Benching or bench |
The floor of a manhole into which the channel is set; the bench is raised so that it can drain to the channel. |
| Benchwall |
The horizontal bottom of the manhole normally out of the flow path. |
| Bent sub |
An offset section of drill stem close behind the drill head that allows steering corrections to be made by rotation of the drill string to orientate the cutting head. Frequently used in directional drilling. |
| Bentonite |
A colloidal clay sold under various trade names that forms a slick slurry or gel when water is added. Also known as drillers mud. See drilling fluid. |
| Berm |
The space between the toe of a slope and excavation made for intercepting ditches or borrow pits. |
| Bid |
The offer or process of the bidder submitted on the prescribed form setting forth the prices for the work to be performed. |
| Bidder |
Any person, firm, or corporation submitting a bid for the work. |
| Biological Corrosion |
Corrosion that results from a reaction between the Pipe material and organisms such as bacterial, algae, and fungi. |
| Bits |
Replaceable cutting tools on the cutting head or drill string. |
| Bitumen |
A hard or semi-hard asphaltic residue; often used in construction as a waterproof/barrier layer. |
| Bituminous (coating) |
Of or containing bitumen; as asphalt or tar. |
| Blind shield |
Non-mechanical shield which has a controlled and partly sealed face. |
| BOD |
Biological Oxygen Demand; a measure of the need for oxygen by organic processes. |
| Bonds |
Bid, performance and payment bonds and other instruments of security furnished by the contractor and his surety in accordance with the contract documents and in accordance with the law of the place of the project. |
| Boots |
Electrical grade boots worn by all operators. |
| Bore |
A generally horizontal hole produced underground primarily for the purpose of installing services. |
| Boring |
(1) The dislodging or displacement of spoil by a rotating auger or drill string to produce a hole called a bore. (2) An earth-drilling process used for installing conduits or pipelines. (3) Obtaining soil samples for evaluation and testing. |
| Boring machine |
A mechanism to drill earth. |
| Boring pit |
An excavation in the earth of specified length and width for placing the machine on line and grade. |
| Box |
See female hex connector. |
| Branch sewer |
A sewer into which at least two sanitary, combined or stormwater sewers connect. |
| Breakout |
Controls the joint make and/or break mechanism. |
| Bridge Plank (deck or flooring) |
A corrugated steel sub-floor on a bridge to support a wearing surface. |
| Brittleness Temperature |
Temperature at which 50% of the tested specimens will fail when subjected to an impact blow. |
| Budgets |
An amount of money needed or allocated for a specific use. |
| Building combined sewers |
A small diameter pipe that conveys both wastewater and drainstormwater from a single property to a combined sewer. |
| Building sanitary drain |
A small diameter pipe that conveys wastewater from a single property (e.g. domestic home) to a sanitary sewer. |
| Building Sewer |
The conduit which connects building wastewater sources, to the public or street sewer, including lines serving homes, public buildings, commercial establishments, and industry structures. In this specification, the building sewer is referred to in tw |
| Building stormwater |
A small diameter pipe that conveys stormwater runoff drain from the roof and any paved areas of a single property to a stormwater sewer. |
| Buoyancy |
The power of supporting a floating body, including the tendency to float an empty pipe (by exterior hydraulic pressure). |
| Burst Strength |
The internal pressure required to cause a pipe or fitting to fail within a specified time period. |
| Bushing |
See female hex connector. |
| Butt Fusion |
A method of joining polyethylene pipe where two pipe ends and rapidly brought together under pressure to form a homogeneous bond. |
| Bypass |
An arrangement of pipes and valves whereby the flow may be passed around a hydraulic structure or appurtenance. Also, a temporary setup to route flow around a part of a sewer system. |
| Bypass Pumping |
The transportation of sewage which flows around a specific sewer pipe/line section or sections via any conduit for the purpose of controlling sewage flows in the specified section or sections without flowing or discharging onto public or private prop |
