Ordering Valves(阀门选型描述及意义)

Replacing Existing Valves cont’d
• Do we need to replace the actuator and other items on the valve?
Pr• Type
– – – – – – – – 1 - Gate 2 - Ball - Floating 3 - Ball - Trunnion 4 - Globe 5 - Check 6 - Needle Gage 7 - Butterfly (ANSI Class 300#) 8 - Multi-Port Gage
Project Valve Specifications cont’d
• Features
– – – – – – – – – – R - Conventional/Reduced Port (Standard Body) F - Full Port G - Lined Butterfly H - High Performance Butterfly E - Extended Body L - Lift Check (Ball/Disc/Piston) P - Piston Check S - Swing Check M - Standard Body w/ Bleed N - Extended Body w/ Bleed
Ordering Valves
Larry Brown - 2005
Ordering Valves - Questions
• I looked on the valve list and the valve that I need is a 12”F3JRC2X. I can just write a materials W/O for a 12”F3JRC2X valve.
Replacing Existing Valves cont’d
Remember – For Operations:
A Valve is not a Valve is not a Valve!!!! What does the above statement mean? Not all valves are the same in function, material, size, etc. We have ordered valve and was guaranteed that they were the same – from Material’s point of view it was correct from our side it wasn’t.
Project Valve Specifications
12”F3JRC2X
• • • • • • • • Size 12” F – ANSI 1500 - ~ 2470 psig Ball – Trunnion Mount Ring Joint Conventional/Reduced Port (Standard) Carbon Steel Body SS 13% Cr Trim Sour (NACE) Service
Replacing Existing Valves cont’d
• What is the valve Criteria?
– Pressure upstream of the valve – Pressure downstream of the valve – Flow rate you want
Project Valve Specifications
12”F3JRC2X • Size 12” • Flange Rating
– – – – – A = 150 lb ANSI B = 300 lb ANSI D = 600 lb ANSI E = 900 lb ANSI F = 1500 lb ANSI
Ordering Valves - Questions cont’d
• As you can see from the previous slide there are lots of things to think about when ordering a new valve. • Replace an existing valve is different than purchasing a new valve to be used on a project.
Replacing Existing Valves cont’d
• Is the flowrate for the present valve adequate?
– As the field ages changes in flowrate occur – both up and down. – If we are ordering a new valve we might want to change out the trim to a larger or smaller size. – For getting a new trim you will need to calculate a new Cv. Give the criteria to Engineering and they will calculate a new Cv for you.
Project Valve Specifications cont’d
• Body
– B - Brass or Bronze – C - Carbon Steel (SS Body for NPS 1-1/2 screwed) – N - Nickel Aluminum Bronze – D - 13% Cr (Duplex SS for NPS 1-1/2) – S - 316L SS – H - Incoloy 825
Replacing Existing Valves
• Do we need an exact duplicate?
– The easiest way is to order an exact duplicate of the one installed initially. – We should have all the information to order a new valve like the one installed. – Look in the Valves Specifications for the particular valve – the data sheet should have all the needed information to order the exact same valve – Write an W/O with all the specifications for materials.
Ordering Valves - Questions cont’d
• Is this to replace an existing valve?
– Need an exact duplicate? – Can another manufacturer’s valve be accepted? – Is the flowrate for the present valve good or do we need to change it? – Do we need to replace the actuator and other items or just the valve?
• Maybe you will need the Maximum and Minimum
– What you are flowing (need characteristic of the media)
• Remember to give them a range and not just one value as it might be they need to change valves
Project Valve Specifications cont’d
Trim
1 - SS 13% Cr (316L for Low Temperature) 2 - SS 13% Cr (316L for Low Temperature) 4 - 316L SS 5 - 316L SS (Duplex SS NPS 1-1/2) 6 - Monel 7 - Bronze 8 - Monel (for FRP) 9 - Incoloy 825
Project Valve Specifications cont’d
• Service
(Blank) - General or Sweet Service X - Sour (NACE) Service L - Low Temperature Z - Glycol ZX - Sour Glycol Service LX - Low Temperature and Sour Service
WRONG
• Vendors do not know what a 12”F3JRC2X valve is – that is a YOC/ACI specification. They know Ball Valve – Full Port – RTJ – Carbon Steel Body – SS 316 ball etc. That is how their valves are listed etc.
Project Valve Specifications cont’d
• Body
– B - Brass or Bronze – C - Carbon Steel (SS Body for NPS 1-1/2 screwed) – N - Nickel Aluminum Bronze – D - 13% Cr (Duplex SS for NPS 1-1/2) – S - 316L SS – H - Incoloy 825