GALLI&CASSINA. Plug Valves. Conical

Transcription

1 Conical

2 Plug Pressure Balanced Type UPPER HOLE LOWER HOLE The Pressure Balanced Plug Contains 2 Holes: The Upper Holes Connects the Plug Port with the Area Above Plug. The Lower hole Maintains Pressure Equalization Between the Plug Port and the Area Below the Plug. This Prevents the Plug from Seizing against the Body and Permits Predictable Turning Torque. Round Port

3 Available Styles Rectangular Port Venturi Pattern 40% - 50% Regular Pattern 60% - 70% Port Opening Is approximately Equal to the inside diameter of an Equivalent size schedule 80 pipe.

4 Plug Pressure Balanced Type WEATHERSEAL GRAPHITE PACKING FIRESEAL LUBRICATION CHAMBER BLOWOUT PROOF STEM PRESSURE BALANCED HOLE-WITH CHECK VALVE LUBRICATION GROOVE PLUG PLUG LOADING SCREW STEM SEALING INJECTOR PLUG SEALANT INJECTOR PRESSURE BALANCED HOLE Rectangular Port

5 Plug Pressure Balanced Type UPPER HOLE LOWER HOLE The Pressure Balanced Plug Contains 2 Holes: The Upper Holes Connects the Plug Port with the Area Above Plug. The Lower hole Maintains Pressure Equalization Between the Plug Port and the Area Below the Plug. The Full Bore port area equal to the adjacent pipe area, preserves the fluid velocity of the pipeline and minimizes the abrasive effects of the fluid on the plug port area. Full Bore 100% Round Port

6 Plug Pressure Balanced Type STEM GRAPHITE PACKING RING O-RINGS OLDHAM COUPLER BODY COVER STEM PACKING INJECTOR LUBRICANT INJECTOR PRESSURE BALANCE HOLE PLUG LOADING SCREW Round Port PLUG METAL DIAPHRAGMS LOADING SCREW CAP LOWER THRUST WASHER

7 Plug Pressure Balanced Type Round Port

8 Design Differences Innovation / Development From Rectangular to Round Port

9 Advantages of Taper Shape Plug against Ball Valves Comparison Between Plug Valves and Ball Valves Ball Valves Plug Valves Design Being a line contact the seating area of a Ball Valve, the sealing capability is soon damaged if the fluid is not very clean. When valve seats (soft/metal) have been damaged, the emergency sealant injection benefits is effective for a short time due to the small sealing area. GALLI&CASSINA Bubbletight Sealing Being the seat area the complete tapered surfaces of plug and body, only heavy damage can cause a reduction of valve sealing. If the valve is cycled, a new sealant injection is required. Lubricant can be injected to achieve a long term zero leakage performance. Valves can be cycled easily without any performance reduction.

10 Ball Valves Plug Valves High Pressure Effects Sealing is not affected by line pressure: it depends only on spring behind seats. Ball valves can t usually be opened against high differential pressure in order to preserve seats integrity. Non-metallic seating components can easily cause a sealing capabilty failure when subjected to a long burn time. Fire Safe Suitability Due to the Pressure Balanced System, the inline pressure: pushes the plug against body seat,increasing the sealing performance; keeps the plug pressure balanced, reducing the torque values. Plug valves are designed and manufactured in order to withstand the maximun differential pressure torque without any problem. Due to the absence of non-metallic seat components, to the metallic body-cover gasket and to the graphite stem gaskets, plug valves have always shown a very high resistance to fire. Once the lubricant is burnt, the plug is still in close contact with the body to guarantee a good sealing result.

11 Ball Valves Plug Valves Deposit of Solids Floating seats can be packed and damaged by solids. Surface finish of ball is critical and seats are protected except during operation. They cannot be-entirely maintained from the outside. Injection of sealant will not restore a long sealing period, shutdown required. Corrosion & Erosion Reliability No body cavity in contact with seating surfaces: edge of body/plug bore works as cutter cleaning the mating surfaces from every deposit of solids. No critical surfaces are directly in contact with fluid. All standard and most of the non-routine maintenance operations, including seat adjustment, can be carried out with valves under full pressure. No shutdown required.

12 Applicable Standard- Specification API 6A API 6D API 6FA Specification for wellhead and christmas tre eequipment. Specification for Pipeline Valves. Specification for Fire Test for Valves. API RP6F Recommended - Practice for Fire Test for Valves. API 598 API 599 ASME/ANSI B 16.5 ASME/ANSI B ASME/ANSI B Valve Inspection and Testing. Steel Plug Valves Flanged or Butt Welding Ends. Pipe Flanges and Flanged Fittings. Face-to-Face and End-to- End Dimensions of Valves. Buttwelding Ends. ASME/ANSI B ASME/ANSI B 31.3 ASME/ANSI B 31.4 ASME/ANSI B 31.8 ASME ASME ASNT-TC-1A Valves-Flanged, threated and Welding Ends. Chemical Plant and Petroleum Refinery Piping. Liquid Trasportation System for Liquid Petroleum Gas. Gas Transmission and Distribution Piping System. Boiler and Pressure Vessel SECTION VIII - DIV.1 & 2 Boiler and Pressure Vessel Section V. Reccommended Practice for Personnel Qualification and Certification in Non destructive Testing.

13 Applicable Standard- Specification BS 1504 Specification for Steel Casting for Pressure Purposes. BS 2080 Face to Face - Centre to Face - End to End - Steell Valves. BS 5353 BS 6755 part 1 BS 6755 part 2 CSA Z MSS-SP6 MSS-SP25 Specification for Steel Testing of Valves (Spec. for Production Pressure Testing Requirements). Testing of valves (Spec. for Fire Safe Testing Requirements). Canadian Standard Association. Standard Finish for contact Face of Pipe Flanges. Standard Marking System for Valves. MSS-SP44 MSS-SP53 MSS-SP54 MSS-SP55 MSS-SP61 Steel Pipe Line Flanges. Quality Standard for Steel Casting-Magnetic Particle Examination Method. Quality Standard for Steel Casting Radiographic Examination Method. Quality Standard for Steel Casting Visual Method. Pressure Testing of Steel Valves. NACE Std. MR National Association of Latest Edition Corrosion Engineers. ASTM American Society for Testing and Materials.

14 Material Selection Guide Trim materials are designed according to the service conditions. 1 Standard Carbon Steel Body and Plug. (ASTM-A216 WCB/WCC material) suitable for general services. 2 Carbon Steel Body and Plug (A352 LCB/LCC material) suitable for low temperature services. 3 Carbon Steel Body and Plug (ASTM A216WCB/WCC material) suitable for SOUR SERVICE (H 2 S and CO 2 ) according to NACE-MR.01.75/ Latest Edition. 4 Special Austenitic (6MO) and Ferritic-Austenitic Stainless Steel (Duplex and Superduplex) suitable for sea water and corrosive services. 5 Nickel-Chromium-Iron alloy (i.e. Alloy 20), Titanium & Titanium alloy, carbon steel with Inconel 625 cladding and stellite or Tungsten carbide hardfacing for abrasive/corrosive service. 6 Other materials upon request.

15 es. GALLI&CASSINA v l g Va Plug Fire Safe Test and Available Tests All Galli & Cassina s Plug Valves have been tested against fire resistence, according to API - 6FA and BS Part 2 standards and witnessed by international third party. Type of Test Applicable Standards Performance X AND GAMMA RAYS ANSI B Annex-B ASME VIII - Div.1 - MSS SP 54 ASTM E446 - E186 - E % all butt welding ends and body. DYE PENETRANT ASME V - art.6 and 24 ASTM E % ANSI B Annex-D MSS-SP-93 all butt welding ends MAGNETIC - PARTICLES (Dry and wet) ASME V - art.7 and 25 ANSI B Annex C MSS - SP % of all valves

16 es. GALLI&CASSINA v l g Va Plug Type of Test Applicable Standards Performance ULTRASONIC ASME V - art.4 and 23 ASME VIII - Div.1 - ASTM A388 Upon customer request VISUAL AND DIMENSIONAL MSS - SP 55 ANSI B B16.10 API 6D - (Table 4.2) 100% of rough and finished machined components and assembled valves HARDNESS NACE - MR Latest Edition 100% of wetted components HYDROSTATIC AND PNEUMATIC API - 6D - API 598 BS Part.1 - MSS SP % of all valves OPERATION TORQUE API - 6D Upon customer request HIGH PRESSURE CLOSURE API par. 4-5 Upon customer request POSITIVE MATERIAL IDENTIFICATION ASTM A % of pressure containing components

17 Advanced Design

18 GALLI&CASSINA ves. l a V Plug Advanced Design Advanced Design Advanced Design Three -dimensional CAD system and the Finite Element Modelling allow the optimization of every step of valve s design. B C B C Casting design (A) Raw FEM calculation of thestress pressure containing parts (B) Final Assembly Design Check (C) A

19 Standard Features: PTFE Antifriction Treatment The Antifriction treatment is basically carried out on the plug to obtain the following advantages: Low friction between plug and body. Low torque. Wear resistance. Resistance to seizure.

20 Special Features: Coating & Overlay Hardfacing The most common damages of valves are either due to abrasion by solids in the flow lines, or the exposure of main components to corrosion attack. Galli&Cassina s researching and development in cooperation with specialized companies and laboratories, have been the development of special hardfacing and corrosion resistant materials, which have achieved excellent results in Off-Shore application. Most of the main materials used are as follows: Stellite-Duplex-6MO Inconel 625-Nickel Alloy 686 Ultimet-Alloy(UNSR31233) Tungsten Carbide.

21 Special Features: Coating & Overlay Electroless Nickel Plating The transport of wet hydrocarbon gases contaminated with hydrogen sulphide, carbon dioxide or other similar fluids containing appreciable level of sulphur, can create various corrosion problems to some component in plug valves. These environments are not always recognized under service conditions, therefore in order to obtain a high quality corrosion resistant, all the material for each component of the valves, are selected in accordance with the requirements of NACE-Std. MR Latest Edition. Moreover the use of an electroless nickel plating on plug surface provides more corrosion protection to hydrogen sulphide crack-resistant base metal. Standard ENP is in accordance with ASTM B733 Std with a minimun (76 Microns) thickness, unless otherwise specified in the customer s specification.

22 es. GALLI&CASSINA v l g Va Plug Typical Applications Rectangular Port Gas/Oil Pipelines By-Pass (Comp. Station) Blow Down Drain/Vent Manifold

23 Typical Applications Round Port Gas/Oil Pipelines Pig Launcher Blow Down Receiver Hot Tap Refinery Catalytic Fluids Slurries High Temperature Service Drilling & Off-Shore Flow Line Shut Down API-6A psi Slurries

24 The Production Range Two Way Standard Type Two Way Pressure Balanced Type Multiport - Three - Four Way Two Way Pressure Balanced Type with Stem Extension Pressure Balanced API 6A Two Way Full Jacketed Body Standard Type Pressure Balanced Special Valves for Abrasive Service Jacketed Tank Bottom Valves

25 es. GALLI&CASSINA v l Va Plug