Section 5 — Piping

IPE-EP-5-3-14

IPE Engineering Practice IPE-EP-5-3-14

Document number: IPE-EP-5-3-14 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Pressure Relief Valves 3.10 Hydrogen Service - A service defined as a combination of hydrogen partial pressure and temperature above the curve for carbon steel per Figure 1 of API Publication 941, latest edition. 3.11 Inspector - A Coastal Aruba Refining Company . appointed engineer or inspector. 3.12 Lift - The actual travel of the disk away from the closed position when the valve is relieving. 3.13 Manufacturer - The recipient of a direct or indirect purchase order for materials and/or equipment. In this context, a direct order is one issued to a manufacturer by a contractor or the Owner. An indirect order is one issued to a manufacturer by a vendor (recipient of a direct order) for materials, fabricated components, or subassemblies. 3.14 Maximum Allowable Working Pressure - the maximum gauge pressure permissible at the top of a completed vessel in its normal operating position at the designated coincident temperature specified for that pressure. The pressure is the least of the values for the internal or external pressure as determined by the vessel design rules for each element of the vessel using actual nominal thickness, exclusive of additional metal thickness allowed for corrosion and loadings other than pressure. The maximum allowable working pressure is the basis for the pressure setting of the pressure relief devices that protect the vessel. The MAWP is normally greater than the design pressure but must be equal to the design pressure when the design rules are used only to calculate the minimum thickness for each element and calculations are not made to determine the value of the MAWP. 3.15 Open–Bonnet Pressure Relief Valve - A pressure relief valve whose spring is directly exposed to the atmosphere through the bonnet or yoke. 3.16 Operating Pressure - The pressure, measured in pounds per square inch gauge, to which the vessel is usually subjected in service. 3.17 Overpressure - Measured in pounds per square inch gauge, is the pressure increase over the set pressure of the primary pressure relieving device allowed to achieve rated flow. Overpressure is termed accumulation when the pressure relieving device is set to open at the vessel’s maximum allowable working pressure. NOTE: When the set pressure of the first (primary) pressure relief valve to open is less than the vessel’s maximum allowable working pressure, the overpressure may be greater than the set pressure per the ASME Code, Section VIII, Division 1, paragraph UG-25. 3.18 Owner - Coastal Aruba Refining Company. 3.19 Owner’s Engineer - A Coastal Aruba Refining Company appointed engineer. 3.20 Pilot Operated Pressure Relief Valve - a pressure relief valve in which the major relieving device or main valve is combined with and controlled by a self actuated auxiliary pressure relief valve (pilot). 3.21 Pressure Relief Device - A pressure relief device is actuated by inlet static pressure and designed to open during emergency or abnormal conditions to prevent a rise of internal fluid pressure in excess of a specified design value. The device also may be designed to prevent excessive internal vacuum. The device may be a pressure relief valve, a non-reclosing pressure relief device, or a vacuum relief valve. 3.22 Pressure Relief Valve - a pressure relief device designed to open and relieve excess pressure and to reclose and prevent the further flow of fluid after normal conditions have been restored.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Pressure Relief Valves 7.3 A line–by–line description of the information to be provided on the Data Sheet is provided in the following subparagraphs. Each subparagraph number refers to a line number on the Data Sheet. An asterisk (*) indicates the minimum amount of information that is to be furnished by the Purchaser. All items without an asterisk are stipulated in either EP 5–3–1 or this Practice, or are to be completed by the Manufacturer. 1) (*)Fill in item number. 2) (*)Fill in user’s pressure relief valve identification number. 3) (*)Specify service, line, or equipment to be protected. 4) Specify number of valves required. 5) (*)Specify the applicable Code(s) and whether Code Symbol nameplate stamping is required. 6) Valve should comply with API Standard 526. 7) (*)Check fire or specify other basis of selection. 8) (*)Specify whether a rupture disk is being used under the valve inlet. 9) (*)Specify whether valve is conventional, balanced-bellows, and/or balanced piston. 10) Give description of valve inlet (full nozzle, semi-nozzle, or other type). 11) Specify open or closed bonnet. 12) Specify metal-to-metal or resilient seat. 13) If other than API 527, specify seat test requirements. 14) (*)Specify pipe size of inlet, flange rating, and type of facing. 15) (*)Specify pipe size of outlet, flange rating, and type of facing. 16) Specify type of connection if other than flanged (e.g., threaded, socket weld, etc.). 17) (*)Specify material of body. 18) Specify material of bonnet. 19) Specify material of seat or nozzle and disk. 20) If a resilient seat is required, specify material. 21) Specify material of guide. 22) Specify material of adjusting ring or rings. 23) Specify material of spring and spring washer. 24) Specify material of bellows. 25) Specify material of balanced piston. 26) (*)Specify if materials should comply with NACE MR0175. 27) Specify any other special material requirements. 28) Specify screwed or bolted cap. 29) Specify if the valve is to have a plain or packed lifting lever, or none. 30) Specify whether a test gag is required. 31) Specify whether a bug screen in a bonnet vent of a bellows, or balanced piston valve is required. 32) Specify other accessories that are required (e.g. limit switches) 33) (*)Indicate flowing fluid and state (liquid, gas, or vapor). 34) (*)Specify quantity of fluid that the valve is required to relieve at relieving conditions and unit of measure (such as pounds per hr, gal per min, or cu ft per min). 35) (*)Specify the molecular weight or specific gravity of the fluid at the flowing temperature. 36) (*)Specify viscosity and unit of measure at the flowing temperature. 37) (*)Specify operating pressure and unit of measure. 38) (*)Specify set pressure and unit of measure. 39) Specify maximum blowdown as a percent of set pressure if different than manufacturer’s standard.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Pressure Relief Valves 40) (*)Specify the latent heat of vaporization. 41) (*)Specify the operating temperature and unit of measure. 42) (*)Specify the actual temperature at relieving conditions and unit of measure. 43) (*)Specify the increase in pressure in the discharge header as a result of flow. 44) (*)Specify the amount of superimposed back pressure that normally exists on the valve outlet and unit of measure. If back pressure is variable, specify the minimum and maximum. 45) Specify the set pressure at which the valve is adjusted to open on the test stand. The cold differential test pressure includes corrections to the set pressure for the service conditions of back pressure, or temperature, or both. 46) (*)Specify the overpressure allowed, as a percent of set pressure or as a unit of measure. 47) (*)Specify the compressibility factor, if used. 48) (*)Give the specific heat ratio as k = C p /C v . 49) Specify the calculated orifice area, in square inches. 50) Specify the selected effective orifice area in square inches. 51) Specify the letter designation of the selected orifice. 52) Fill in the name of the manufacturer, if desired. 53) Fill in the manufacturer’s model or type numbers, if desired. 54) (*)Confirmation of orifice sizing calculations required from vendor.

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