- Date of publication:
- 1999
- Series code:
- HSG28
Update
Updates to HSG28, paragraphs 120 and 124, and figures 3, 4, and 5.
Double bursting discs with a pressure indicator or alarm between them are often provided in aggressive environments to allow early detection and action if the first disc begins to leak.
Paragraphs 120 and 124 state a preference in relief systems for 2 bursting discs placed back to back, as shown in figures 3, 4 and 5. However, since this guidance was written, technology has advanced and standards have changed, and different designs of bursting disc are now available from disc manufacturers, including double disc arrangements.
Duty holders should note that:
- the information set out in paragraphs 120 and 124, in terms of the orientation of bursting discs, is no longer valid and should be ignored and replaced with the following guidance: "Bursting discs should be UKCA or CE-certified and must always be fitted in a properly designed arrangement and in accordance with the certification and guidance from the disc supplier or manufacturer."
- The orientation of bursting discs shown in figures 3, 4, and 5 are no longer valid and should be ignored.
Publication
Extensive guidance for sites receiving tankers of liquid chlorine by road, rail or ISO means. Addressed primarily to installation managers but relevant for plant supervisors, design and maintenance engineers and safety professionals. Guidance application will help to minimise risks on and off-site as far as reasonably practicable.
In addition to general health and safety management issues, eg training, risk assessment, emergency procedures, the design and location of installations, maintenance and inspection, it also examines a multitude of detailed specifics including: potential incidents, installation siting, connections to fixed lines, pipework for chlorine and protection against overpressure, valves, vessels, vaporisers, absorption systems and leakage control. Also considers personal protective equipment, toxicology and the basic characteristics of chlorine.