API SPEC 7F:2010 pdf download

API SPEC 7F:2010 pdf download.Oil Field Chain and Sprockets.
A.2.3.2 Type I—Manual or Drip Lubrication
For manual lubrication, oil is applied periodically with a brush or a spout can, preferably once each eight hours of operation. The time may be longer than eight hours, if it has proven adequate for that particular drive. The volume and frequency of oil application must be sufficient to prevent a red-brown (rust) discoloration of the oil in the joints. The red-brown discoloration indicates that the oil in the joints is inadequate. When the rust discoloration is found, remove, clean, relubncate, and reinstall the chain prior to continuing operation.
NOTE Manual lubrication is to be done only when the drive is stopped and power to the drive is locked out.
For drip lubrication, oil is dripped between the link plate edges from a drip lubricator. Drip rates range from 4 to 20 or more drops per minute, depending on chain speed. Here again, the drip rate must be sufficient to prevent a red-brown (rust) discoloration of the lubricant in the chain joints. Care must be taken to prevent windage from misdirecting the oil drops. The oil level in the reservoir should be checked after each 8 hours of operation, and the reservoir refilled when needed.
For multiple strand chains, a distribution pipe is needed to feed oil to all the rows of link plates, and a wick packing usually is required to distribute oil uniformly to all holes in the pipe (Figure A.6).
A.2.3.3 Type Il—Oil Bath or Slinger Disc Lubrication
For oil bath lubrication, a short section of the lower strand of the chain runs through a sump of oil in the chain casing (Figure A.7). The oil level should just reach the pitch-line of the chain at its lowest point in operation. Long sections of chain running through the oil bath, as in a nearly horizontal lower span, should be avoided because they can cause oil foaming and overheating.
In slinger disc lubrication, the chain operates above the oil level. A disc on one shaft picks oil up from the sump and slings it against a collector plate. Then, the oil usually flows into a trough that applies it to the upper edges of the link plates in the lower strand of the chain (Figure A.8). The diameter of the disc should produce rim speeds between 600 ft/mm (183 rn/mm) and 8000 ft/mm (2438 rn/mm). Lower speeds may not pick up the oil effectively, while higher speeds may cause oil foaming or overheating.
In both oil bath and slinger disc lubrication, the temperature of the oil bath and the chain should not exceed 180°F. Also, the volume of oil applied to the chain must be great enough to prevent the red-brown (rust) discoloration of lubricant in the chain joints. The oil level in the sump of both oil bath and slinger disc systems should be checked after each 8 hours of operation, and oil added when needed. At the same time, the system should be checked for leaking, foaming, or overheating.
A.2.3.4 Type Ill—Oil Stream Lubrication
With oil stream lubrication, a pump delivers oil under pressure to nozzles that direct a stream or spray onto the chain. The oil should be applied evenly across the width of the chain, and be directed onto the lower span from inside the chain loop (Figure A.9). Excess oil collects in the bottom of the casing and is returned to the pump suction reservoir. A pressure-regulating valve may be used to divert excess pump discharge to the reservoir. Oil cooling may occur by radiation from the external surfaces of the reservoir or by a separate heat exchanger.
Oil stream lubrication is always recommended for chains operating at relatively high speeds and loads. It is absolutely essential for roller chains that operate in the indicated galling region for any extended time period. The oil stream not only lubricates the chain, but also cools the chain and carries away wear debris from a drive being run at or near full rated capacity. The minimum oil flow rate for the amount of horsepower being transmitted is shown in Table A.3.
Here again, the oil level in the sump should be checked after each 8 hours of operation, and oil added when needed. At the same time, the system should be checked for leaking or overheating.