BS 3463:1975

This standard BS 3463:1975 Specification for observation and gauge glasses for pressure vessels is classified in these ICS categories:

• 23.020.30 Gas pressure vessels, gas cylinders

This British Standard specifies requirements for the main types of observation and gauge glasses for pressure vessels, and also specifies inspection and testing techniques for toughened glasses, under the following main headings.

Section 1	General
Section 2	Tubular glasses for level gauges
Section 3	Protector glasses for tubular gauge glasses
Section 4	Through-vision and reflex glasses
Section 5	Circular sight and light glasses
Section 6	Port gauge glasses as used in fittings for steam boilers
Section 7	Inspection and thermal shock testing of toughened glasses and tubular glasses

Standard dimensions, material and quality of glass for tubular, protector, through-vision and reflex glasses for level gauges, for circular sight and light glasses and for port gauge glasses for high pressure steam boilers. Also thermal shock test methods and requirements.