34-SAMSS-612
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Previous Issue: 30 March 2005 Next Planned Update: 23 April 2011 Revised paragraphs are indicated in the right margin Page 1 of 8 Primary contact: Buerkel, David William on 966-3-8747339
Copyright©Saudi Aramco 2005. All rights reserved.
Materials System Specification
34-SAMSS-612 23 April 2006 Safety Relief Valves Pilot Operated Types
Instrumentation Standards Committee Members Awami, Luay Hussain, Chairman Tuin, Rienk , Vice Chairman Bogusz, Zbigniew Jozef Dakhil, Tareq Khalil Dhafeeri, Farhan Taieh Ell, Steven Tal Fadley, Gary Lowell Qaffas, Saleh Abdal Wahab Trembley, Robert James Falkenberg, Anton Raymond Jumah, Yousif Ahmed Khalifa, Ali Hussain Madhi, Fawaz Abdullah Mahmood, Balal Qarni, Mahdi Ali
Saudi Aramco DeskTop Standards Table of Contents 1 Scope............................................................. 2 2 Conflicts and Deviations................................. 2 3 References..................................................... 2 4 Environmental Conditions.............................. 3 5 Design and Construction................................ 5 6 Inspection and Testing Requirements............ 6 7 Nameplate Data and Tagging........................ 7 8 Preparation for Shipment............................... 8
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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1 Scope
This specification together with Buyer's Quotation Request or Purchase Order and Specification Sheet 8020-612-ENG define the minimum technical requirements for pilot operated type industrial safety relief valves used on equipment that has a maximum allowable working pressure of 15 psig or greater.
Pilot operated relief valves used to vent and protect low pressure storage tanks with maximum allowable working pressures of less than 15 psig are not covered by this specification.
2 Conflicts and Deviations
2.1 Any conflicts between this specification and other applicable Saudi Aramco Materials System Specifications (SAMSSs), Engineering Standards (SAESs), Standard Drawings (SASDs), or industry standards, codes, and forms shall be resolved in writing by the Company or Buyer's Representative through the Manager, Process & Control Systems Department of Saudi Aramco, Dhahran.
2.2 Direct all requests to deviate from this specification in writing to the Company or Buyer's Representative, who shall follow internal company procedure SAEP-302 and forward such requests to the Manager, Process & Control Systems Department of Saudi Aramco, Dhahran.
3 References
Material or equipment supplied to this specification shall comply with the latest edition of the reference list below, unless otherwise noted.
3.1 Saudi Aramco Documents
Saudi Aramco Engineering Procedure
SAEP-302 Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement
Saudi Aramco Engineering Standard
SAES-A-301 Materials Resistant to Sulfide Stress Corrosion Cracking
Saudi Aramco Forms and Data Sheet
Form 8020-612-ENG Safety Relief Valves Pilot Operated
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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Saudi Aramco Inspection Requirement
Form 175-342000 Safety Relief Valves Pilot Operated Types
3.2 Industry Codes and Standards
American National Standards Institute
ANSI B16.34 Valves, Flanged and Butt-Welded End
American Petroleum Institute
API RP 520 Recommended Practice for the Design and Installation of Pressure Relieving Systems In Refineries
API STD 526 Flanged Steel Safety Relief Valves
API STD 527 Commercial Seat Tightness of Safety Relief Valves with Metal-to-Metal Seats
American Society of Mechanical Engineers
ASME SEC VIII D1 Boiler and Pressure Vessel Code, Section VIII, Division 1, Pressure Vessels
ASME B16.5 Steel Pipe Flanges and Flanged Fittings
American Society for Testing and Materials
ASTM E10 Test Method for Brinell Hardness of Metallic Materials
ASTM E18 Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
3.3 Engineering Units
Unless specified otherwise all engineering units shall be in the International System of Units (SI). Equivalent values in conventional units enclosed in parentheses may follow the SI units. When they are not critical, the equivalent conventional values may be rounded to their nearest practical values.
4 Environmental Conditions
4.1 Outdoor Conditions
4.1.1 Humidity and Temperature Conditions
Relief Valves and Accessories shall operate continuously under the
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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following ambient air temperatures without any degradation of the manufacturer's guaranteed performance:
Outdoor
Unsheltered Humidity
Maximum 65°C
(149°F) 95%
Minimum 0°C
(32°F) 5%
4.1.2 Ambient Air Quality
Onshore Environment
The normal air borne dust concentration shall be considered as 1 mg/m³. During sand storms dust concentrations may reach 500 mg/m³. The dust particle size distribution is 95% smaller than 20 micrometers and 50% smaller than 1.5 micrometers. The dust contains salts of sodium, magnesium, aluminum and calcium, which are severely corrosive when wet.
Other atmospheric pollutants normally expected include those listed in Table 1.
Table 1 – Expected Atmospheric Pollutants
in Volumetric Parts Per Million at Worst Case Conditions
Pollutant Concentration PPM
Carbon Monoxide 50 –100
Hydrocarbons 10 – 50
Hydrogen Sulfide 1 – 5
Nitrogen Oxides 1 – 5
Sulfur Dioxide 1 – 5
4.1.3 Offshore and Nearshore Environment
Equipment which is not enclosed or hermetically sealed, but is situated offshore or nearshore, shall be protected against corrosion and operational failure due to wind-borne sea water spray and the accumulation of wetted salt (NaCl). Nearshore is defined as any outdoor, onshore location within one kilometer from the shoreline of the Arabian Gulf; all of the Ras Tanura Refinery and Terminal; and within three kilometers from the shoreline of the Red Sea.
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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5 Design and Construction
5.1 Pilot Operated Safety Relief valves shall meet the relevant requirements of ASME SEC VIII D1, Boiler and Pressure Vessel Code for pressure-relief devices and shall carry the appropriate stamp.
Capacity shall be certified by the National Board of Boiler and Pressure Vessel Inspectors.
5.2 Minimum inlet flange rating shall be ASME B16.5 Class 300.
5.2.1 Flange facings and dimensions shall be in accordance with ASME B16.5.
5.2.2 Flange face to face and body dimensions shall be in accordance with API STD 526. Manufacturer shall notify the Buyer when none standard bodies are supplied.
5.3 Valve body and bonnet material shall be in accordance with ASME SEC VIII D1, Boiler and Pressure Vessel Code, UG 136 (b) Material Selections. The valve body materials shall be equivalent to or better than the following types and grades:
Cast carbon steel ASME SA216, Grade WCB
Cast chromium molybdenum steel ASME SA217, Grade WC6
Cast austenitic steel ASME SA351, Grade CF8
Cast 3.5% nickel steel ASME SA352, Grade LC3
5.4 In sour service all wetted materials shall meet SAES-A-301. Welds and heat-affected zones of welds exposed to corrosive components shall meet the hardness and heat treatment requirements as specified in SAES-A-301. This includes materials under overlays, platings or coatings.
5.5 The required orifice area shall be calculated in accordance with API RP 520, Part I, Section 3.
5.6 The manufacturer shall specify the selected API 526 effective orifice size, actual orifice size and corresponding actual ASME certified coefficient of discharge.
For restricted lift valves the manufacturer shall specify the actual orifice size, lift and equivalent flowing area and equivalent coefficient of discharge.
These values will be used to calculate actual flowing capacity, inlet pressure drop and noise.
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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Lift restrictors shall be non adjustable and shall be secured in place with a spigot. Fixed spacers or equivalent shall be used to restrict main valve piston lift.
5.7 Pilot valves shall be non flowing type. Flowing pilots are not acceptable.
5.7.1 Manual lifting levers or test pressure connection on the pilot for manually operating the main valve shall be supplied for air, hot water above 140°F, or steam service when designated on the Specification Sheet(s) Form 8020-612-ENG. (Reference UG-136(a)(3))
5.7.2 Pilot setpressure springs and stem seals shall be protected from blowing dust/sand. Open yoke bonnets are not allowed.
5.7.3 All elastomer seals, seats and O rings shall be suitable for design conditions and the process fluid.
5.7.4 All Pilot valves shall be provided with a Pilot filter.
Exception:
Whessoe Model 4150/4151 low pressure pilot valve. (Large 6" diameter Pilot directly bolts to tank and does not require a filter).
6 Inspection and Testing Requirements
Valves manufactured to this Specification are subject to verification per Saudi Aramco Inspection Requirement Form 175-342000, Valve: Safety Relief: Pilot Operated.
6.1 Test Requirements
6.1.1 Hydrostatic tests shall be conducted in accordance with ASME SEC VIII D1, UG-136 (d) (2,3). The "design pressure of the parts" in UG-136 (d) (2) shall mean vendor's maximum design pressure for subject valve (not set pressure of subject valve).
6.1.2 Operational tightness tests shall be conducted per API STD 527 with the exception that there shall be no visible sign of leakage (no bubbles) past resilient seats for a period of one minute.
6.1.3 Set pressure tests shall be conducted per ASME SEC VIII D1. The set pressure adjustment shall be sealed.
6.1.4 The manufacturer shall certify blowdown pressure setting against type test results. Individual blowdown tests on each valve are not required. The acceptance criteria are stated on the Specification Sheet.
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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6.1.5 When SAES-A-301 "Materials Resistant to Sulfide Stress Corrosion Cracking" is specified in the Purchase Order, the Vendor shall conduct hardness tests on all wetted parts in accordance with ASTM E10 or ASTM E18. Manufacturer shall conduct tests on a production sampling basis on machined components or produce test documentation to certify that base metal has been tested. Components or base metal shall be certified on a heat lot basis. Test results shall be traceable to Purchase Order line items.
6.2 Basic Final Acceptance Test Requirements
Production testing shall follow the ASME SEC VIII D1, Boiler and Pressure Vessel Code, requirements. When so specified on the Purchase Order, Buyer's Representative will select 30%, with a minimum of one each line item, of the total number of valves ordered to witness a repetition of the Vendor's own tests. The retest of the valves shall apply to hydrostatic pressure, set pressure, and operational tightness tests and shall produce results which comply with the appropriate specifications. If the retest of one or more valves does not comply with the specifications, then all valves must be retested in the presence of Buyer's Representative.
7 Nameplate Data and Tagging
7.1 Each valve shall have a corrosion-resistant name plate permanently attached to the valve assembly. The nameplate shall be stamped with data shown in Table 2.
Table 2 – Nameplate Data
Data Description
Manufacturer's name or identifying trade mark
Identification of manufacturer
Size Nominal pipe size, inlet by outlet Type style model or figure number Manufacturer's designation Orifice Valve orifice size, API standardized letter
designations/manufacturer shall specify actual orifice area for full lift valves and equivalent orifice area for restricted lift valves
Lift For restricted lift valves manufacturer shall specify minimum rated lift
Capacity at x % overpressure Lbs. per hour of saturated steam, SCFM of air, or cubic feet per hour of water at 20°C
Serial number or shop number Manufacturer's identification Set pressure, psig Valve inlet pressure at which the pressure relief
valve is adjusted to open under service conditions Back pressure, psig Superimposed and built up SAES-A-301 (If Applicable) Valve manufactured for sour service per
SAES-A-301
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Document Responsibility: Instrumentation 34-SAMSS-612 Issue Date: 23 April 2006 Next Planned Update: 23 April 2011 Safety Relief Valves Pilot Operated Types
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7.2 Tagging
Each valve shall be stamped with the valve number as specified on the Instrument Specification Sheet or on the Purchase Order. The number may be stamped on the nameplate or on a separate corrosion-resistant tag that is permanently attached to the valve.
8 Preparation for Shipment
Each valve shall be prepared for shipment as follows:
8.1 Threaded openings shall be plugged with suitable protective devices. Temporary plugs should be readily distinguishable from permanent metal plugs.
8.2 Inlet and outlet flanges shall be protected to prevent damage from or entrance of foreign material during shipment.
Export packing, marking and shipping shall be in accordance with the requirements of the Purchase Order.
Revision Summary 23 April 2006 Revised the Next Planned Update. Reaffirmed the contents of the document, and reissued
with editorial changes.