Cylinders manufacture

Acetylene cylinders are fitted with safety devices to release the acetylene ia the event of fire. Cylinders manufactured ia the United States are equipped with safety devices which contain a fusible metal that melts at 100°C. In large cylinders the safety devices are ia the form of a replaceable, threaded steel plug with a core of fusible metal. Small cylinders (0.28 and 1.12 m 10 and 40 fT, respectively) may have the fusible metal ia passages ia the cylinder valve. 

The manufacturer identifying symbol historically can be a series of letters or a unique graphical symbol. In recent years, the DOT has standardized this identification with the M number, for example, M1004. This is a number issued by DOT that identifies the cylinder manufacturer. 

Industrial consumers of bought-in hydrogen usually store the gas in banks of vertical or horizontal cylinders at pressures in the range from 20 MPa up to a maximum of 80 MPa. Such high pressures necessitate thick-walled and heavy steel containers. In the past, failures have been experienced through hydrogen embrittlement, which induces stress fractures in the steel. Cylinder manufacture is now therefore subject to strict standards and codes of practice. This form of storage is modular with little economy of scale. 

Failure to have a cylinder manufacturing registration number/symbol when required. Various 2,500. 

Failure to comply with eddy current examination requirements for DOT 3AL cylinders manufactured of aluminum alloy 6351-T6, when applicable. Appendix C to Part 180 2,600 to 6,500. 

DOT 2Q) must not be refilled with any material. After using, such cylinders must be disposed of in accordance with the cylinder manufacturer s recommendations [9]. 

There are three predominant categories of cylinder manufacture seamless, welded, and composite. 

See Title 49 of the U.S. Code of Federal Regulations (49 CFR) Part 178 or Canadian Standards Association (CSA) Standards B339 and B340 for detailed specification requirements for cylinder manufacture [1, 3,4]. 

Fig. 5-1. Permanent markings shown stamped into the shoulder of a cylinder include DOT (or TC) specification 3AA service pressure in psig 2265 cylinder manufacturer s symbol, manufacturer s serial number KI61110, and cylinder owner s symbol BTWECO. The month and date of the initial qualification test along with the identifying mark of the inspector stamped on the opposite side of the shoulder are not shown.

For cylinders stamped DOT-3 or DOT-3E without any pressure markings, the service pressure is 1800 psig (12 410 kPa). DOT 3E cylinders manufactured in recent years are stamped DOT3E1800. 

Cylinder markings require inspection prior to each filling. These marks include the cylinder specification (for example, ICC, DOT, and CTC or TC), service pressure, and the latest test date. The latest test date must be checked to ensure that the cylinder does not require retesting prior to filling. The original test date may provide information on the required frequency of testing. DOT specification 3A and 3AA cylinders manufactured after December 31, 1945 can be tested at 10-year intervals provided they are in noncorrosive gas service as defined by DOT and TC. 

Never attempt to repair or alter cylinders. This should be done only by the cylinder manufacturer. Only the supplier of the acetylene gas must perform valve repairs. If a cylinder is leaking, follow the recommendations in the section on Handling Leaks and Emergencies. 

Arsine is authorized for shipment in cylinders manufactured in compliance with TC/DOT specification 3A, 3AA, 3E, or 3AL and must not exceed 125-lb (57-kg) water capacity (nominal). Specification 3AL cylinders containing arsine may only be transported by highway and rail. Cylinder valves must be protected and sealed from leaks in accordance with 49 CFR 173.40 [5]. 

In the case of a marking plate that is not completely sealed, any evidence of corrosion between it and the wall necessitates removal of the plate and visual inspection of the cylinder wall. However, removal of the plate must be undertaken only by authorized repair facilities or original cylinder manufacturers, as stated in 49 CFR 173.34. [1]... 

Cylinders with maximum service pressure ratings of 1800, 2000, and 2400 psig for the following TC/DOT specifications are authorized for ethylene service 3A, 3AA, 3AX, 3AAX, 3AL, and 3T. Specification 3E1800, 3AA2265, and 39 cylinders are also authorized. Cylinders manufactured under the now obsolete specifications DOT-3 may be continued in service, but new construction is not authorized. When used for shipment of flammable gas, the internal volume of a Specification 39 cylinder must not exceed 75 in. (0.0123 m ). 

By 29 May experiments had been made with a number of gases. Chlorine was readily available, but there was a shortage of plant for liquefying it and cylinders could only be filled at the rate of a ton (that is, 50 cylinders) a day 1500 cylinders had been ordered. There were also problems over cylinder manufacture and initially the use of... 

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