UL 144:2002 pdf download – LP-Gas Regulators.
3.4 REGULATOR. FIRST-STAGE – A type of high-pressure regulator for LP-Gas vapor serve designed to reduce pressure from the contarner to a nommal pressure of 2-10 psig (137 – 68.7 kPa).
34 reeed June 29. 2001
3.5 REGULATOR FLOW CAPACITY – The maximum flow rate of a regulator at conditions as specafied by the manufacturer, usually given in units of BTU/hr and which is based upon factory setting of inlet and outlet (dervery) pressures.
3.6 REGULATOR. HIGH-PRESSURE – A pressure regulator for LP-Gas liquid or vapor service designed to reduce pressure from the container to a lower pressure in excess of 1.0 psig (6,9 kPa).
36revsed June29, 2001
3.7 REGULATOR, INTEGRAL iWO-STAGE – A pressure regulator that oonibrnes a high pressure regulator and a second-stage regulator into a srngle unit.
38 REGULATOR, SECOND-STAGE – A pressure regulator for LP-Gas vapor service designed to reduce first-stage regulator outlet pressure to a pressure equal to or less than 14 inch (356 mm) water column [nominal 11 inch (279 mm) water column).
38 revie1 June i, 201)1
39 REGULATOR. SINGLE-STAGE – A pressure regulator for LP-Gas vapor servxe designed to reduce pressure from the container to a pressure of 1 psig (6.9 kPa) or less (nominal 11 inch (279 mm) water columnj
39,ev,.ed June 29.2001
3.10 REGULATOR, SPECIAL-PURPOSE HIGH PRESSURE – A pressure regulator for LP-Gas designed to reduce the prevailing cylinder, tank or other pressure in excess of I psig (6.9 kPa) to a lower pressure. TFWs regulator is not intended for wistallatlon in two-stage pipeng systems that serve 112 psi appliance systems.
310 reeed Januaiy 13. 2000
3.10.1 REGULATOR, SPECIAL PURPOSE LOW PRESSURE – A pressure regulator for LP-Gas vapor service designed to reduce high pressure or first stage regulator outlet pressure to a maximum pressure of 1 psig (6.9 kPa) or less This regulator is not intended for instaIlatn in two-stage piping systems that serve 112 psi appliance systems.
3101 revieed June 29, 2001
3.10.2 REGULATOR, TWO PSIG SERVICE – A type of high-pressure regulator for LP-Gas vapor service designed to reduce first-stage regulator outlet pressure to a pressure of 25 psig (17.2 kPa) or less (nominal 2 psig (13.8 kPa)).
3,102 nevised Jun. 29, 2001
3.10.3 REGULATOR, INTEGRAL TWO PSIG SERVICE – A pressure regulator that combines a high pressure regulator and a two psig service regulator into a single unit
311 VALVE, TYPE I RELIEF — A valve that is constructed to relieve pressure resulting from seat leakage due to the inabihty of the seat mechanism to achieve lock-up.
312 VALVE. TYPE II RELIEF – A valve that has a start-to-discharge setting in accordance with Table
14.1 and is constructed to limit regulator outlet pressure to 2 psg (13.8 kPa) [for second-stage. integral
two-stage and automatic changeover regulators when used as part of a two-stage regulator systemj or
5 psig (34.9 kPa) (for two psig service and Integral two psig service regulators when used as part of a 2
psig regulator systemj when tested in accordance with the Type II Relief Valve Flow Capacity Test,
Section 25.
3.12 rriecd June 29. 2001
4 Service Pressure and Temperature Ratings
4.1 The maximum inlet pressure rating of a single-stage. first-stage, high-pressure. integral two-stage. or integral two psig service regulator shall not be less than 250 psig (1.7 MPa).
4 1 reviaed J.iy 13, 2000
4.2 The maximum inlet pressure rating for a second-stage or two psig service regulator shall be 10 psig (68.7 kPa).
42reviedJanuMy 13. 2000
4.3 Regulators covered by these requirements shall be capable of being used when exposed to ambient temperatures within the range of minus 4OC — plus 55C (minus 40F — plus 130SF).
CONSTRUCTION
5 Assembly
5.1 A regulator shall include all the components required for its intended function. The components shall be planned for assembly as a unit.
5.2 A regulator that is designed for field adjustment shall be provided with convenient means of adjustment.
Exception: A regulator IO portab’e equEpment is not required to be adjustable.
5.3 A sorew, bolt, or lever-pin hole shall not extend through the outer wall of the regulator body Into a gas-handling chamber unless closed by a tl’weaded plug or that which is determined to be the equivalent to prevent leakage of gas.
5.4 A valve seat or disc shall be attached to its holder by a method that does not permit the disc to loosen and work out of position when tested in accordance with the requirements in the Leakage and Strength of Mechanism Test, Section 18, and the Endurance Test. Secton 27.
5.5 A holder and disc assembly shall be constructed to preclude the trapping of air or gas in back of the disc that expands and forces the disc out of its position In the holder.