51. Tracked Changes. Gas cylinders. Cylinder valves. Threads for connection of valves to gas cylinders. Specification Part 1, (30th April 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (154 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
52. Tracked Changes. Plastic piping systems. Mechanical joints between fittings and pressure pipes. Test method for leaktightness under negative pressure. (9th May 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (34 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
53. Tracked Changes. Plastics piping systems for soil and waste discharge (low and high temperature) within the building structure. Chlorinated poly(vinyl chloride) (PVC-C). Specifications for pipes, fittings and the system Part 1, (8th June 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (114 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
54. Tracked Changes. Plastics piping systems. Elastomeric-sealing-ring-type socket joints for use with plastic pressure pipes. Test method for leak tightness under negative pressure, angular deflection and deformation. (15th November 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (32 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗