Standards

This standard describes exhaust emission requirements for all new domestic and commercial vehicles which have been registered in Guyana for the first time after December 31, 1997. This standard also describes exhaust emission requirements, measurement methods and measurement equipment for all vehicles, which are imported into Guyana after December 31, 1997. All imported vehicles would be required to conform to exhaust emission limits specified in the standard. Accordingly, the exhaust emission limits must be fully documented and certified by the suppliers/manufacturers, from the country of origin.

 This standard establishes the basic principles for carrying out vibration measurement and processing data, with regard to evaluating vibration effects on buildings. The evaluations of the effects of building vibration are primarily directed at structural response, and include appropriate analytical methods where the frequency, duration and amplitude can be defined. It only deals with the measurement of structural vibration and excludes the measurement of   airborne sound pressure and other pressure fluctuations. 

This standard provides general guidance on methods of carrying out penetrant inspection on materials and components both during manufacture and in service. It does not deal with acceptance or rejection. Penetrant inspection is used to locate discontinuities, such as laps, folds, cracks, porosity and fissures, which are open to the surface of a material or component. Penetrant techniques can be used on materials irrespective of their physical properties, provided that the surface is normally non-absorbent and compatible with the penetrant process. 

This standard provides general guidance on

. This standard specifies the minimum requirements for industrial illuminators used for viewing radiographs.

 This standard lays down general requirements on penetrant flaw detectors and their functional units which are designed to reveal invisible, or poorly visible to the eye, surface discontinuities in metals and non-metals of any geometry and at any stage of manufacture.

This part of GYS 120 specifies an ultrasonic testing method for determining bond defects between the bearing metal and the backing.  The test can be performed on metallic multilayer plain bearings consisting of backings lined with bearing metal based on lead and tin, with layer thickness greater than or equal to 0, 5 mm.  The test is not possible within half the diameter of the crystal from the edges of the bearing, oil holes, grooves, etc. because of undefined reflections. In bearings with dovetail keying grooves at the bond, the test may not be possible along the edges of the dovetails.   

. This part of GYS 120 specifies a non-destructive penetrant testing for determining bond defects and discontinuities in the sliding surface of the bearing. The penetration method is used to detect - bond defects in the transitional area between the bearing backing/bearing material on the end faces and joint faces of multilayer plain bearings which cannot be detected by the ultrasonic testing method specified in ISO 4386- 1; discontinuities in the sliding surface of the bearing. The penetration method is applicable, in principle, to finished multilayer plain bearings.

This standard specifies requirements for full peripheral ultrasonic shear wave testing of seamless and welded tubes for pressure purposes, with the exception of submerged arc-welded (SAW) tubes, for the detection of longitudinal imperfections according to four different acceptance levels (see table 1). This standard is applicable to the inspection of tubes with an outside diameter greater than or equal to 9 mm, and with an outside diameter-to-thickness ratio greater than or equal to 5. For tubes with an outside diameter-to-thickness ratio less than 5, one of the methods specified in Annex A shall be used by agreement between manufacturer and purchaser. 

  This standard specifies requirements for eddy current testing of seamless and welded tubes for pressure purposes, with the exception of submerged arc-welded (SAW) tubes, for the detection of imperfections, according to two different acceptance levels (see tables 1 and 2).  It is applicable to the inspection of tubes with an outside diameter greater than or equal to 4 mm.