دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a mechanical drive using a driving chain and chain gears to transmit power. Power transmissions use a roller chain, in which each link is made of side bars, transverse pins, and rollers on the pins. A double roller chain is made of two connected rows of links, a triple roller chain of three, and so forth. chain guard n: in a chain-and-sprocket drive, a case that protects workers from the moving drive. It also protects die drive from dirt and is part of the cooling and lubrication systems. Some enclose only one drive and some enclose several drives. May be made of sheet metal or plate metal. Heavier guards also support the shafts on bearings. Both types have access panels for inspection and maintenance.

n: see slinger disk lubrication.

n: a method of lubricating a chain-and-sprocket drive in which a reservoir drips oil onto the chain at 4 to 20 drops per minute, depending on the speed of the drive. A drip lubricator for a multistrand drive has a pipe to distrioote the oil to all strands.

n: (PbS) lead sulphide. Technical grades (specific gravity about 7) are used for increasing the density of drilling fluids to points impractical or impossible with barite. gall n: damage to steel surfaces caused by friction and improper lubrication.

n: leadsulphate. Technical grades (specific gravity gbout 7) are used for increase density of drilling fluids to points impractical or impossible with barite.

lead sulfide, PbS. A mud weighting additive for high mud weights.

adj: the result of the sticking or adhesion of two mating surfaces of metal. not protected by a film of lubricant. and tearing due to lateral displacement.

thread damage from lack of lubrication or mismatched metals.

n: a device on a machine that is designed to accept the hose of a grease gun so that grease can be added to the part in need of lubrication.

n: a part of seal lubrication system of bit, which fixes palm of bit.

n: see displacement method.