Oxygen Service

The Habonim "O" Series Oxygen Service ball valves are suitable for use on both liquid and gaseous oxygen. All valves designated for Oxygen Service are carefully prepared and cleaned to the degree required for the safe operation of Oxygen Service equipment and product purity.

Oxygen

The normal oxygen content of air is approximately 21% by volume. Human exposure to atmospheres containing 12% or less oxygen will bring about unconsciousness without warning. Oxygen is an odorless, colorless gas, which has many uses in industry, especially in steel and chemical manufacture. It is nonflammable but, all materials that are flammable in air, burn much more vigorously in oxygen. Oxygen is shipped as a nonliquefied gas at pressures of 2000 psig (138 bar) or above, also as a cryogenic liquid at pressures and temperatures below 200 psig (13.8 bar) and -232 0F (-146.5 0C). Oxygen is produced at air separation plants by liquefaction of atmospheric air and separation of the oxygen by fractionation. Very small quantities are produced by the electrolysis of water.

Oxygen Uses

Oxygen is used extensively in medicine, high altitude flying, deep-sea diving and a power source in the space programs. Industrial applications include utilization with acetylene, propane, hydrogen and other fuel gases for such purposes as metal cutting, welding, hardening and scarfing. In the steel industry, oxygen helps increase the capacity and efficiency of production in steel and iron furnaces. One of its major uses is in production of synthesis gas which is used to make gasoline, methanol and ammonia. It is also used in production of nitric acid, ethylene and other compounds.

Materials of Construction

Gaseous oxygen is noncorrosive and may be contained in systems constructed of any common metal. Stainless steel, bronze and brass are the preferred material for all metal components coming in contact with oxygen. At the temperatures of liquid oxygen, ordinary carbon steels and most alloy steels lose their ductility and are therefore considered unsatisfactory for liquid oxygen service. Carbon Steel cannot be adequately cleaned for oxygen service.

Oxygen Hazards

Never permit oil, grease or other combustible substances to come in contact with oxygen service valves or valve parts. Combination with these substances can result in explosive violence.

Design
Habonim carries a wide selection of valves for Oxygen Service suitable to fulfill most applications. Valves are available with screwed, socket weld, ANSI Class 150 and ANSI Class 300, DIN PN16 and DIN PN40 flanged ends. Flanged valves range from 1/2" to 8", and three piece valves from 1/4" to 4". Body material include 316 stainless steel, monel, bronze and brass. Standard ball and stem material is 316 stainless steel or brass. PTFE or glass filled PTFE are inert in oxygen and are the standard seat and seal material for Oxygen Service. Acetal Resin (Delrin) seats and Nylatron stem thrust seals MUST NOT BE USED IN OXYGEN SERVICE Habonim Oxygen Service Valves may be used on both liquid and gaseous oxygen. For temperatures below -60°C, our Cryogenic Valves are recommended.

Preparation

All valve components used for oxygen service, in gaseous or liquid state, are deburred to a high standard and specifically cleaned to remove any traces of oil, grease or hydrocarbon materials before assembly. Assembly of Oxygen Service Valves is carried out in a "Clean Area" using lint free gloved hands to assure no ingress of grease or dust. Only lubricants compatible with oxygen are used. Valve seating and external leakage pressure tests are conducted in the "Clean Area", using grease free nitrogen. Only specially clean tools are used for valve assembly.

Packing

The successfully tested valves are restored to the "open" position. A "Silica-gel pack" is placed in each valve end and capped. The capped valve is labelled "Prepared for Oxygen Service", and sealed in a polyethylene bag. A second label is attached to the sealed bag, clearly stating - "Caution, Silica-gel Pack in each valve end - remove before operating or putting into service" Valves for oxygen service are identified by a letter "O" before the series number.

Accessories

Locking devices are available, including the unique design for "Locked in Last Position" (LLP). Valves with a stem extension are provided for insulated pipelines. Valves can be used with the Habonim Compact Actuator for automation and remote control.

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