Maximum diameter solids

required or expected in a system usually for a specific time.

maximum diameter solids With regard to pumps, the largest solid the pump can pass without clogging, or jamming.

maximum run time The amount of time a sprinkler can operate on a particular soil and vegetation type before it exceeds its infiltration rate into the soil. Each soil has a basic intake rate, and when exceeded, the extra water must run off the surface. This rate is expressed in inches per hour (clay, 0.10; silty clay, 0.15; clay loam, 0.20; loam, 0.35; sandy loam, 0.40; loamy sand, 0.50; sand, 0.60) can be divided by the precipitation rate and multiplied by 60 (to convert to minutes) for the maximum amount of time that sprinklers in an area with a specific soil type should be run to avoid runoff.

maximum size of aggregate With regard to concrete, the largest aggregate particles within the mix in sufficient quantity so as to affect the mix. This is usually determined by sieve size. It is common to allow about 5 to 10% of the concrete's weight to be made of this size.

maximum working pressure The maximum pressure at which piping materials and devices are safe to use.

maze or planting maze A fanciful planting scheme designed with a much contrived tortuous path between hedges with dead ends and many splits in the path making it difficult for one to find a way through the area on the path.

mbf Abbreviation for thousand board feet.

m.b.m., MBM In the lumber industry, abbreviation for thousand board measure (feet).

MC, mc 1. Abbreviation for moisture content. 2. Abbreviation for metal-clad.

MC asphalt Abbreviation for medium-curing asphalt.

mcf Abbreviation for thousand cubic feet.

MCM Abbreviation for thousand circular mills. See wire size.

meadow An area predominated by grasses or forbs and often associated with wildflowers. They are mostly thought of as openings in woods or forests, and have few if any trees within their area. Some seed companies have a seed mix they call by this name with plants common to such areas.

meager lime With regard to lime for mortaring, a low-purity lime containing 15% impurities or more.

mealybugs Scaly insects of the family Pseudo-coccidae having a white powdery covering. They have an oval-shaped body, with soft white plates that have the white cotton-like covering. Unlike most scales, these bugs can move, but very slowly. They can cause stunting or death of plants by sucking plant juices. One may find that if they have infested for a time there can be a black, sooty mold growing on the honeydew they secrete. Ants often feed on the honeydew. Spray plants off every two weeks or so to knock them off or use an insecticidal soap. Indoors they can be controlled by wiping with a cotton swab soaked in rubbing alcohol. Natural predators are ladybugs and lacewings.

meander A bend or loop in a water course; or a water course that bends and turns.

mean gradient Average slope.

measuring chain See chain.

mechanical connection Attachment of two or more elements with fasteners such as bolts, rivets, or screws, instead of with glue, or welding.

0 0

Post a comment