Jabsco Pump Catalog

Pump Selection Most proprietary marine engines are already fitted with specially adapted flange mounted Jabsco cooling pumps driven by gears or couplings of various descriptions. A belt drive from the crankshaft pulley will enable almost any standard foot mounted bronze Jabsco pump to be selected, provided that the required cooling flow rate is obtained without operating the pump at excessive speeds. Global cooling water requirement for each 100hp at maximum engine load and rpm is at right. DIESEL ENGINES Heat exchanger cooling 18 GPM (68 LPM) — raw water Keel cooling 36 GPM (136 LPM) — fresh water Direct cooling 12 GPM (45 LPM) — raw water GASOLINE ENGINES Increase diesel engine figures by about 10%. If exhaust manifolds are water cooled, increase pump capacity by a further 10-15%. Pump Types Selection may depend upon pump speed, space available and type of drive. BALL BEARING PUMPS For pump speeds in excess of 2500 rpm, ball bearing pumps should be used. Depending on size and duty, speeds of up to 5000 rpm are possible, but special attention to suction system conditions is then required (consult Jabsco). Ball bearing pumps are available in heavy-duty and compact types. HEAVY-DUTY PUMPS This range is designed with two spaced bearings and mechanical rotary face seals to meet high reliability criteria under adverse operating conditions, i.e., excessive belt tension, high operating pressure, abrasive conditions found in shallow waters or in-shore operation. Pump bodies are either bolted to a bearing housing or body and bearing housing are a single, integral casting. These types of pumps are often unique to the application, but some varying pump types can share common bearing housings. COMPACT PUMPS This pump range is fitted with double row ball bearings, providing a low cost compromise between overall pump length and a limited heavy-duty capability. Bearings are shielded, ensuring permanent lubrication by the special grease. Pump Drive Failure The majority of pump failures are caused by badly designed pump systems. Secondary causes of pump problems are unsatisfactory drive arrangements. Radial Deviation Angular Deviation Correct Alignment 98 11 Flexible Impeller Pumps INTRODUCTION