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Hydraulic Technical Library - This is an excellent comprehensive site with heaps of Maintenance and Troubleshooting Links, Application Guidelines along with Formulaes and Technical reference data. From

Hydraulics Calculations, Formulas and Rules of Thumb - a useful range of calcs, formulas etc - from

Hydraulic Troubleshooting - Many of the failures in a hydraulic system show similar symptoms: a gradual or sudden loss of high pressure, resulting in loss of power or speed in the cylinders. In fact, the cylinders may stall under light loads or may not move at all. Often the loss of power is accompanied by an increase in pump noise, especially as the pump tries to build up pressure. Any major component (pump, relief valve, directional valve, or cylinder) could be at fault. In a sophisticated system other components could also be at fault, but this would require the services of an experienced technician. By following an organized step-by-step testing procedure in the order given here, the problem can be traced to a general area, then if necessary, each component in that area can be tested or replaced - from

Hydraulic Symbols - This technical reference covers hydraulic symbols pretty well -from

Hydraulic Symbols Tutorial - This is a good tutorial for people who would like to know more about hydraulics - from

4.12 Hydraulics Education Site - This technical reference site by R van den Brink has some useful information. This includes What is hydraulics?, Energy conversion in a hydraulic system, Gear Pump  , Gear Pump with three wheels, Axial Piston Pump, Axial Piston Pump with Variable Displacement, Vane Pump, Vane pump with variable displacement, Axial piston pump with rotating barrel, Gearmotor, Radial piston motor 'startype' , Internal radial piston motor, Internal radial piston motor as a wheel motor, ORBIT-motor, Limited angle rotary actuator, Draining, Pressure relief valve, Pilot operated pressure relief valve, Pilot operated pressure relief valve as an unloading valve, Pressure relief valve in the motor circuit, Direction control valve, Flow control, Pressure compensated flow control, Pilot operated checkvalve, Counterbalance valve, Interactive animation of the counterbalance valve, Accumulator, Cylinder with end position cushioning, Closed loop system, Cavitation, Compressibility of fluids, The Escher-cylinder and  Interesting links.

The following useful hydraulic links are from Precision Fluid Power, Inc

Production Subsea Control Systems - An Introduction - Professor Jacek S Stecki - This overview paper covers Control Equipment – Topside Umbilicals - Control Equipment  Subsea -Types of Hydraulic Control System -Development Trends - Integrated Control Buoy - Thanks to

Hydraulic Data Book - This useful publication from Hyquip covers Hydraulic Units, Conversions and Symbols, General Formulae, Hydraulic Symbols, Hydraulic Pipes and Hoses, Accumulators, Hydraulic Cooling and Heating and Terminology.

Hydraulic Fault Finder - This useful publication from Hyquip covers Lack of Delivery, Lack of Pressure, Excessive System Noise, Causes of Pump Failure, Irregular Cylinder Action and  Excessive Fluid Temperature.

Leak Sealant in Hydraulic Systems minimises Maintenance Costs in Offshore Wells - Miguel A. Mendoza, and Javier Hernandez/PEMEX, and David W. Rusch  - One of the main problems detected by Petroleos Mexicanos in the offshore wells of the Marine Region are related to flaws in the hydraulic systems, both surface or subsurface, of the subsurface safety valves, which are one of the most important control devices that are required in this region by regulation. This paper covers this issue. From  Seal-Tite International.

Advice For Maintaining Hydraulic Accumulators - Brendan Casey - Gas-charged accumulators are ubiquitous on modern hydraulic systems. They carry out numerous functions, which include energy storage and reserve, leakage and thermal compensation, shock absorption, and energy recovery. While accumulators present a number of advantages in hydraulic system operation and can provide many years of trouble-free service, they are a maintenance item. From

Wellhead Hydraulic Control Panel

Wellhead Control and Hydraulic Power - An overview design requirements NORSKE standard.

What Happened to NAS 1638? - Mike Day - If you obtain the latest issue of NAS 1638 you will find the following statements: “Inactive for new designs after May 30, 2001, see AS4059C” and “6.1.3 This standard should not be used with Automatic Particle Counting.” This is a result of recent changes to the ISO contamination standards for automatic particle counter (APC) calibration3, which necessitated the review of NAS 1638 and resulted in its withdrawal for newly designed systems - From

Wellhead Hydraulic Control Panel Water Based Fluids - Oceanic HW fluids are water based hydraulic media specifically form-ulated for use in modern subsea production control systems. Their low viscosity promotes optimum system response, while a sophisticated additive package provides a high degree of protection against wear, cor-rosion and microbiological degradation. The Oceanic HW fluids have been developed in close consultation with component manufacturers, and are now in worldwide use, helping to achieve maximum production system safety and reliability.

Wellhead Hydraulic Control Panel Specification - Although not a full specification this is a useful design guide.

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