Hydro-Excavation is a process of allowing digging in any soil condition without damaging existing infrastructures. It is a safe, non-destructive digging technology for utilities and industrial facilities. Digging can take place close to trees with only minor peripheral damage to the roots. This is important for the environment and for safety, leaving the tree alive and unbroken. It is quicker and safer than hand digging, with much smaller hole size and hence smaller reinstatement costs. The use of hydro excavation technology includes drilling mud removal, street ironwork, pumping stations and industrial cleanup.

Hydro indexing valves are an alternative to individual solenoid valves. When water enters the valve, the pressure forces the disc down sealing all of the outlets. As the water is shut off, the valve drains and the spring inside the stem forces the stem and disc assembly upwards. The cam on top of the valve then rotates the stem and disc assembly to the next zone.

Hydro-pneumatic spring is a gas string with hydraulic force transmission. It comprises a plunger-cylinder assembly and a reservoir connected with the cylinder. It is provided with means for a substantially constant liquid supply and with a discharge throttling opening that varies with the position of the plunger in the cylinder. The plunger is supported in the cylinder by means of hydrostatic bearings which employ the supply and the discharge pressure of the liquid flow through the spring.

Hydroactive Polyurethane Grouts are used for varied waterproofing needs. They are injected into the leaking structures and react with water to form expanding closed cell foam filling voids and penetrating cracks and fissures. These are used to stop leakage through cracked or honeycombed concrete, voids, expansion joints and pipe intrusions. It is also recommended for use in tunnels, manholes, sewer lines, tanks, dikes and dams.

A hydrocarbon analyzer is used for rapidly measuring both methane and nonmethane hydrocarbons. The analyzer includes a nonmethane hydrocarbon absorbing first column connected in series with a methane absorbing second column. A sample gas is propelled in a carrier gas through a carrier gas line into the first and second columns via a change-over valve for switching between a branched line connected between the carrier gas line. The first flame ionization detector is used for measuring nonmethane hydrocarbons and a second flame ionization detector is connected to the second column for measuring methane. The change-over valve switches from a gas sample introducing position to a backflush position, so that the sample gas is introduced into the first nonmethane hydrocarbon absorbing column where the nonmethane hydrocarbons are absorbed.

Portable hydrocarbon filter provides an extra level of hydrocarbon removal. It has a layer of hydrocarbon booms that cover the bottom of the unit. This layer captures any hydrocarbons that are not absorbed in the perimeter boom when the runoff has high concentrations of hydrocarbon. This filter unit is ideal for gas stations, automotive repair facilities, refineries, and vehicle maintenance areas.