ANSI FCI 85-1-2011 pdf download Standard for Production Testing of Steam Traps
1. SCOPE 1.1 This standard specifies production and performance tests that are considered applicable to steam traps.
1.2 These tests may be conducted to ensure the correct functioning of a steam trap or to evaluate the performance of particular designs, either currently in production or under consideration for production.
2. DEFINITIONS
2.1 Steam trap – A self-contained valve which automatically drains the condensate from a steam containing enclosure while remaining tight to live steam, or, if necessary, allowing steam to flow at a controlled or adjusted rate. Most steam traps will also pass non-condensable gases while remaining tight to live steam.
2.2 Production tests – Those tests carried out by the manufacturer to confirm that the steam trap functions correctly. These tests may be witnessed by the purchaser or his representative. In this case, these tests are referred to as acceptance tests.
2.3 Performance characteristic tests – Carried out to determine the operational characteristics of a particular design of steam trap.
3. TECHNICAL TERMS
3.1 Nominal Size (DN) – A numerical designation of size which is common to all components used in a piping system other than components designated by outside diameter. It is used for reference purposes and is normally only loosely related to manufacturing dimensions (inches). 3.2 Nominal Pressure (PN) – Internal pressure at a temperature of 68 o F (20°C) which is used as a basis in the determination of limitations of the steam trap (lb/in 2 ).
3.3 Maximum Allowable Pressure (PMA) – Maximum pressure that the shell of the steam trap can withstand permanently at a given temperature (lb/in 2 ).
3.4 Maximum Operating Pressure (PMO) – Pressure for which a steam trap is rated by the manufacturer. This pressure is normally a function of the limitations related to the internal equipment of the steam trap (lb/in 2 ).
3.5 Operating Pressure (PO) – Pressure measured at the inlet of the steam trap under operating conditions (lb/in 2 ).
3.6 Operating Back Pressure (POB) – Pressure measured at the outlet of the steam trap under operating conditions (lb/in 2 ).
3.7 Maximum Operating Back Pressure (PMOB) – Maximum permissible pressure at the outlet of the steam trap allowing correct functioning (lb/in 2 ).
3.8 Operating Differential Pressure (ΔP) – Difference between the operating pressure and the operating back pressure (lb/in 2 ). 3.9 Maximum Differential Pressure (ΔPMX) – Maximum difference between operating pressure and operating back pressure (lb/in 2 ).