API 526-2002 pdf download.Flanged Steel Pressure Relief Valves.
1.4 RESPONSIBILITY The purchaser is primarily responsible for the following: a. Selecting the type of pressure relief valve and the required pressure-temperature ratings. b. Specifying materials that will satisfactorily resist corro- sion from the process ßuid and environmental conditions. c. Selecting the minimum required oriÞce area based upon relieving conditions derived from full knowledge of the pres- sure-relieving system and the requirements of the applicable codes and regulations. d. Providing data for sizing and selection. The manufacturer is primarily responsible for the following: a. Designing and manufacturing pressure relief valves to sat- isfy the requirements of this standard and the purchaserÕs speciÞcation. b. Publishing relieving capacities based upon certiÞed test data. c. Advising the purchaser of any nonconformance to the pur- chaserÕs speciÞcation. d. Final sizing veriÞcation using the manufacturerÕs actual oriÞce area and certiÞed coefÞcient of discharge. 1.5 CONFLICTING REQUIREMENTS Whenever the information included on the purchaserÕs speciÞcation sheet or purchase order conßicts with the provi- sions of this standard, the purchaserÕs speciÞcation sheet or purchase order shall govern. Where conßicting requirements exist, the manufacturer shall call them to the attention of the purchaser. 1.6 ORIFICE AREAS AND DESIGNATIONS The standard effective oriÞce areas and the corresponding letter designations are listed in Table 1. These effective areas are valid only when used with the sizing equations contained in API RP 520, Part I.
2 Design 2.1 GENERAL Pressure relief valves discussed in this standard shall be designed and manufactured in accordance with the applicable requirements of Section VIII of the ASME Boiler and Pres- sure Vessel Code for pressure relief devices. 2.2 DETERMINATION OF EFFECTIVE ORIFICE AREA The minimum required effective oriÞce area shall be deter- mined in accordance with API RP 520, Part I. 2.3 VALVE SELECTION For valves described in this standard, inlet and outlet ßange sizes and pressure-temperature ratings shall conform to the data in Tables 2 Ð 15 for spring-loaded valves and Tables 16 Ð 29 for pilot-operated valves. Inlet and outlet pressure limits are governed by the ßange pressure/tempera- ture limits or by the manufacturerÕs design limits, whichever is lower.
4.2 SET PRESSURE TEST All pressure relief valves shall be adjusted to the speciÞed set pressure in accordance with the ASME Boiler and Pres- sure Vessel Code , the manufacturerÕs standard practice as published, or as designated by the purchaser. All set pressure adjustments shall be sealed. 4.3 SEAT LEAKAGE TEST All pressure relief valves shall be seat leakage tested in accordance with API Std 527, or as agreed upon by the manu- facturer and the purchaser. 5 Identification and Preparation for Shipment 5.1 IDENTIFICATION Each pressure relief valve shall have a corrosion-resistant nameplate permanently attached to the body or bonnet. This nameplate shall be stamped with the data speciÞed in Appen- dix B. Pilot-operated pressure relief valves shall have an addi- tional nameplate permanently attached to the pilot. The pilot nameplate shall be stamped with the manufacturerÕs name, pilot type, set pressure, and serial number. Each pressure relief valve shall be tagged with the pur- chaserÕs valve number or other identiÞcation as speciÞed on the purchase order. The data may be stamped on the name- plate or on a separate corrosion-resistant tag that is perma- nently attached to the valve. 5.2 PREPARATION FOR SHIPMENT Each pressure relief valve shall be prepared for shipment as follows: a. After test and inspection, all exterior surfaces, except ßange facings, shall be painted as agreed upon by the manu- facturer and the purchaser. Corrosion-resistant materials need not be painted. Flange facings shall be coated with a suitable corrosion inhibitor.