What factor should we consider about ball valve? - Eng-Tips

1. Manufactured in accordance with? (BS , API
6D,MSS-SP-72) what ever is applicable.

2. Applicable codes and standards (I don’t know what
size or material else process in question in
addition face-to-face dimensions to be employed)

a. API 6FA,598,605,607 ?
b. ASME B16.5,16.10,16.24,16.34,16.47 ?
c. BS ,,,,?
d. MSS-SP-44,72?
e. NACE-MR?
f. ASTM’s

3. Materials (I don’t know what kind of service you
have in mind)

a. Body/Bonnet
b. Ball
c. Trunnion
d. Body Seat Ring
e. Steam Seal
f. Spring
g. Body studs/nuts

4. Design

a. Split body, fully body, top entry, side
entry, full/reduced bore?

b. Trunnion mounted or floating type

c. End connections (SW/THRD/Flanged RF/RTJ ?)

d. Drain connection

e. Body Seat ring renewable? Welded?

f. Secondary sealing arrangement?(I dont know
the size or service)

g. Arrangement B&B bleeding connection fitted
where?

h. Control of cavity pressure (upstream
venting/self relieving seat)

i. Sealing of stem?

j. Soft seats (antistatic devices, BS)



5. Operation

a. Lever/wrench?

b. Actuators?

6. Inspection

a. Hardness readings

b. Hydrostatic/Pneumatic testing

c. ENP application if applicable

d. NDE’s (PT-RTG, MPI-Body PT for non-magnetic
bodies)

e. Volumetric examination (RT-ASTM E94/142)
100% of butt welds. Acceptance criterion
ASME Sect. VIII, Div.1 or ASME B16.34
Annex. B or C I forgot; please check.


Much or less I presume, hope it helps btw I'm not good in valves. Talk to CHDO1

regs Commissioning means new pipeline, which has not only debris from the gas but also metal weld wire, weld debris, mud, stone from the pipeline fabrication.

Recommmendation to prevent seat leakage due to debris during commisioning;

Keep the valve in open position

Apply proper grease to the gap between the ball and seat and between seat and end piece. Grease will keep the debris away from the seat sealing and functional critical surfaces.

After installation by using seat emergency sealent ports apply proper media to flash the grease from the seat area.

Try your best to flash the pipiline until you make sure that the line is clean.

Try not to operate the valves until the line is %100 clean.

Do not operate the valve during pipe line shell test, if ball valve has a hole between ball bore and body cavity, which enables you to do shell test while the vavle is in open position.

If seat test is required do it prior installation. If you have to do seat test after installation, close the valve than apply pressure. Do not open the valve without equalizing down stream side of the valve otherwise debris will move from high pressure to low pressure side and may damage the seat inserts.

Do not leave the valves in half open position.

Valve leakage problems during commisioning stage could be very frustrating for the owner, construction company, engineering co. and valve manufacturer.

There are some companies they provide service during commisioning stage.

I hope I addressed your question. Feel free to me
about not recommending lubrication for valves.
Most vendor do recommend us don't grease valve. But in our experience, during gas in when commissioning, gas will contain with much of debris, sand, dust and etc. that can damage seat of valve. So, how about your opinion in this point?

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What Are Seal-Welded Valves?

Seal-welded valves are a type of valve where the body and end connections are permanently joined by welding. This design creates a leak-proof, tamper-resistant seal, making them ideal for applications where reliability and safety are paramount. Unlike threaded or bolted valve assemblies, seal welded valves eliminate the potential for leakage due to loose connections or gasket failures.

Applications of Seal-Welded Valves

Seal-welded valves are widely used in industries that require robust and maintenance-free flow control, including:

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1. Oil and Gas:
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2. Chemical Processing:
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3. Power Generation:
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4. Pharmaceutical and Food Industries:
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Advantages Over 1-, 2-, and 3-Piece Ball Valves

While 1-, 2-, and 3-piece ball valves are popular for their versatility and ease of maintenance, seal-welded valves offer distinct advantages in specific scenarios:

1. Leak Prevention: Seal welded valves provide a permanent seal, reducing the risk of leaks. This is particularly important in systems handling hazardous, toxic, or high-value materials.
2. Durability and Longevity: The welded construction eliminates moving parts like bolts and gaskets that can degrade over time. This ensures a longer service life with minimal maintenance.
3. Compact Design: Seal-welded valves often have a smaller footprint compared to multi-piece ball valves, making them suitable for tight spaces or applications with strict weight requirements.
4. Tamper Resistance: The welded body prevents unauthorized disassembly, a crucial feature for applications requiring enhanced security or regulatory compliance.
5. Cost-Effective in the Long Run: While the initial cost of a seal welded valve might be higher, their reduced need for maintenance and replacement can result in significant savings over time.

Considerations When Choosing Seal-Welded Valves

Despite their advantages, seal welded valves are not without limitations. They are not ideal for applications requiring frequent disassembly or cleaning, as the welded design makes them non-repairable. However, for systems where maintenance access is limited or downtime is costly, their benefits far outweigh this drawback.

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