Guaranteeing safe pump start-up operations

Product catalog summary

Introduction
Correct pump start-up operations are crucial for ensuring the longevity of pumps, minimizing plant downtime, and avoiding potential dangers. Pumps are integral to various industrial processes, handling substances like water, chemicals, and oil. Despite their robust design, improper valve operations during start-ups can lead to damage.

Understanding Dead-Headed Centrifugal Pumps
A centrifugal pump is considered 'dead-headed' when it operates without flow, often due to a closed discharge valve. This condition causes the liquid to heat up and potentially vaporize, leading to excessive wear, overheating, and even explosions due to hydraulic overpressure.

Current Risk Mitigation Strategies
Existing methods to prevent dead-heading include installing recirculation lines and temperature sensors. These measures aim to maintain flow and alert operators to overheating. However, they may not fully prevent dead-heading.

Preventing Dead-Heading with Valve Interlocks
Sofis offers a solution using valve interlocks to enforce safe pump line-up procedures. These interlocks ensure that operators follow the correct sequence of opening valves before activating the pump, thus eliminating human error.

Enhancing Control Room Communication
The Sofis VPI position indicator can be used to signal valve positions to the control room, enhancing process performance and safety by preventing incorrect pump line-ups.

Practical Example of Using Valve Interlocks
To prevent dead-heading, a predefined sequence using valve interlocks is recommended:

Start with Key A from the control room.
Use Key A to unlock and open the suction valve (V1), releasing Key B.
Use Key B to unlock and open the discharge valve (V2), releasing Key C.
Use Key C to unlock and activate the main power switch (S1).

This sequence ensures the correct operation of valves before pump activation.

Contact Information
For more information on custom solutions, contact Sofis via email at [email protected], call +31 (0)172 471339, or visit their website at sofisglobal.com.

Catalog excerpts

Guaranteeing safe pump start-up operations

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In many industries, pumps are an essential part of processes. Industrial pumps are used to move many different types of products, including water, chemicals, petroleum, wastewater, oil, sludge and slurry. Industrial pumps are designed specifically for use in harsh or heavy-duty applications. Still, they can be damaged as a result of incorrect valve operations during pump start-ups. Correct operations are indispensable to guarantee a long life of pumps. avoid dangers and minimise plant downtime. Correct pump start-ups are indispensable to guarantee a long life of pumps, avoid dangers, and minimise...

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Dangers associated with pump start-up operations Current risk mitigation attempts are inadequate A centrifugal pump is 'dead-headed' when it is operated with no flow through it, for example, with a closed discharge valve or against a seated check valve. If the discharge valve is closed and there is no other flow path available to the pump, the impeller will churn the same volume of liquid as it rotates in the pump casing. This will increase the temperature of the liquid (due to friction) in the pump casing to the point that it will flash to vapor. The vapor can interrupt the cooling flow to the...

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Guaranteeing safe pump start-up operations-4

Prevent dead-heading by enforcing safe pump line-up procedures To eliminate the dangers of incorrect pump startups, Sofis offers an easy and effective solution. The main switch of the pump as well as the suction and discharge valve are equipped with valve interlocks. The operator must open both valves before he can turn on the main switch of the pump. The transfer of uniquely coded, linear keys from valve to valve, compel your operators to follow the correct pump start-up process steps and eliminate human error. Using interlocks, operators are only allowed to open or close the correct valve in...

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Guaranteeing safe pump start-up operations-5

To avoid a dead-head of the pump as a result of closed suction and discharge valves, you can deploy valve interlocks to enforce a predefined valve operation sequence. The valve operation sequence guarantees that the suction and discharge valves are opened first, before the power switch of the pump can be turned on. 1. Take Start Key A from the control room 2. Insert Key A into the locking device of the suction valve (V1) of the pump. Open the valve and release Key B from the interlock. The valve is trapped in open position. 3. Insert Key B into the locking device of the discharge valve (V2) of...

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Contact us Do you want to know more about our custom-made solution for your hard-to-reach valves? • Mail us at [email protected] • Call us at +31 (0)172 471339 • Visit sofisglobal.

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Guaranteeing safe pump start-up operations

Guaranteeing safe pump start-up operations

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