How much load variations can be generally allowed for variable spring?

How much load variations can be generally allowed for variable spring?
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1 Answer

Answer :

25%
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Variable spring : The load of the spring will be varying with respect to its travel

Description : Variable spring : The load of the spring will be varying with respect to its travel

Last Answer : Constant spring : The load of the spring will be constant irrespective of its travel.

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Description : How to calculate the height of a Variable Spring hanger?

Last Answer : Answer: Select the height from vendor catalog based on spring size and stiffness class. For base mounted variable spring hanger the height is mentioned directly. It is the spring height. For top ... variable spring hanger's ass spring height with turnbuckle length, clamp/lug length and rod length.

What is the main difference between Constant and Variable Spring Hanger? When to use these hangers?

Description : What is the main difference between Constant and Variable Spring Hanger? When to use these hangers?

Last Answer : Answer: In Constant Spring hanger the load remains constant throughout its travel range. But In variable spring hanger the load varies with displacement. Spring hangers are used when thermal ... difficult to qualify nozzle loads by variable spring hangers, constant spring hangers can be used.

How much displacement can be generally allowed in sustain case

Description : How much displacement can be generally allowed in sustain case

Last Answer : 5mm

Which spring will you select for your system: Spring with low stiffness or higher stiffness and why?

Description : Which spring will you select for your system: Spring with low stiffness or higher stiffness and why?

Last Answer : Answer: Springs with lower stiffness provides less load variation for same travel. So this spring is a better choice than a spring hanger with higher stiffness.

Can you select a proper spring hanger if you do not make it program defined in your software? What is the procedure?

Description : Can you select a proper spring hanger if you do not make it program defined in your software? What is the procedure?

Last Answer : Answer: In your system first decide the location where you want to install the spring. Then remove all nearby supports which are not taking load in thermal operating case. Now run the program ... with spring constant and hot load enter any vendor catalog to select spring inside the travel range.

What are the major parameters you must address while making a Spring Data-sheet?

Description : What are the major parameters you must address while making a Spring Data-sheet?

Last Answer : Answer: Major parameters are: Spring TAG, Cold load/Installed load, Vertical and horizontal movement, Piping design temperature, Piping Material, Insulation thickness, Hydro-test load, Line number etc.

Under what circumstance spring will be used?

Description : Under what circumstance spring will be used?

Last Answer : When there are no chances to take the vertical load (especially nearer to nozzle, pump exchanger etc) thro normal supports, spring will be used.

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Description : How to build the load cases when one pump is standby and other one is running?

Last Answer : For running pump : The line temp will be given as normal case. For standby pump : ambient temp will be given upto the isolation valve and average temp will be from the valve to the branch of the running line .

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Description : What are the types of bonnets?

Last Answer : Answer: Bolted bonnet, bellow sealed bonnet, screwed on bonnet, union bonnets, A U-bolt and clamp type bonnet, breech-lock bonnet, pressure seal bonnet

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Description : What are types of gate valves?

Last Answer : Answer: Solid plane wedge, solid flexible wedge, split wedge, double disc parallels seats, double disc wedge, single disc single seat gate or slide, single disc parallel seats, plug gate valve.

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Description : What is lantern ring?

Last Answer : Answer: It’s a collection point to drain off any hazardous seepage or as a point where lubricant can be injected; it is in the middle of packing rings.

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Description : How to close a gate valve?

Last Answer : Answer: Turn the hand-wheel in clockwise direction.

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Description : What are port types for gate valves?

Last Answer : Answer: Full port and reduced port. Default is reduced bore. Full port has to be specified in bom.

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Description : What is double disc globe valve?

Last Answer : Answer: Has two discs bearing on separate seats spaced apart, on a single shaft, for low torque, used for control valves.

Where WYE body globe valve is used?

Description : Where WYE body globe valve is used?

Last Answer : Answer: In line ports with stem emerging at 45 degree, for erosive fluids due to smoother flow pattern.

Where plug type disc globe valve is used?

Description : Where plug type disc globe valve is used?

Last Answer : Answer: For severe regulating service with gritty liquids such as boiler feedwater and for blow off service.

What are types of globe valve?

Description : What are types of globe valve?

Last Answer : Answer: Angle globe valve, plug type disc globe valve, WYE-body globe valve, composite disc globe valve, double disc globe valve.

What are characteristics of globe valve stem?

Description : What are characteristics of globe valve stem?

Last Answer : Answer: Always rising design, with disk nut at the lower end and handwheel at upper end.

What are globe valve disk types?

Description : What are globe valve disk types?

Last Answer : Answer: Flat faced type for positive shutoff, loose plug type for plug renewal or needle type for finer control.

What are globe valve port types?

Description : What are globe valve port types?

Last Answer : Answer: Full port: More than 85% of bore size, Reducer port: One size less than the connected pipe.

How to install a globe valve?

Description : How to install a globe valve?

Last Answer : Answer: Globe valve should be installed such that the flow is from the underside of the disk, Usually flow direction is marked on the globe valve.

What is needle valve?

Description : What is needle valve?

Last Answer : Answer: Full pyramid disc, same design as globe valve, smaller sizes, sw or threaded, flow control, disc can be integral with stem, inside screw, borged or barstock body and bonnet, manufacturers standard.

What is pinch valve?

Description : What is pinch valve?

Last Answer : Answer: Similar to diaphragm valve, with sleeves of rubber or PTFE, which get squeezed to control or stop the flow, Cast iron body, for very low service pressures like isolation of hose connections, manufacture standard.

What is dimensional standard for plug valve?

Description : What is dimensional standard for plug valve?

Last Answer : Answer: API 599.

What are eccentric plug valve?

Description : What are eccentric plug valve?

Last Answer : Answer: Off center plug, corrosive and abrasive service, on off action, moves into and away from seat eliminating abrasive wear.

What are permasil plug valve?

Description : What are permasil plug valve?

Last Answer : Answer: Plug valves with Teflon seat instead of sleeves, for on-off applications, can handle clean viscous and corrosive liquids, Graphite seat for high temperature applications. Drip tight shut off not possible.

What are Teflon sleeved plug valve?

Description : What are Teflon sleeved plug valve?

Last Answer : Answer: PTFE sleeve between plug and body of valve, low turning effort, minimum friction, temperature limitation, anti static design possible.

What is pressure balanced plug valve?

Description : What is pressure balanced plug valve?

Last Answer : Answer: With holes in port top and bottom connecting two chambers on top and bottom of plug, to reduce turning effort.

What are inverted plug design valve?

Description : What are inverted plug design valve?

Last Answer : Answer: Plug valve with taper portion up of plug. For 8” and higher size.

What are ventury pattern plug valve?

Description : What are ventury pattern plug valve?

Last Answer : Answer: Change of section through the body throat so graded to have ventury effect, minimum pressure loss.

What are short pattern plug valve?

Description : What are short pattern plug valve?

Last Answer : Answer: Valves with face to face dimension of gate valve, as a alternative to gate valve.

What is regular pattern plug valve?

Description : What is regular pattern plug valve?

Last Answer : Answer: Rectangular port, area almost equal to pipe bore, smooth transition from round body to rectangular port, for minimum pressure loss.

What are three patterns of plug valve design?

Description : What are three patterns of plug valve design?

Last Answer : Answer: Regular pattern, short pattern and ventury pattern.

What is metal seated lubricated plug valve?

Description : What is metal seated lubricated plug valve?

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What are uses of four way valve?

Description : What are uses of four way valve?

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What are the uses of three-way valve?

Description : What are the uses of three-way valve?

Last Answer : Answer: Alternate connection of the two supply lines to a common delivery vise versa, isolating one safety valve, division of flow with isolation facility.

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Description : What are types of flush bottom valves?

Last Answer : Answer: Valves with discs opening into the tank and valves with disks into the valve.

What are flush bottom valves?

Description : What are flush bottom valves?

Last Answer : Answer: Special type of valves used to drain out the piping, reactors and vessels, attached on pad type nozzles.

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Description : What is float valve?

Last Answer : Answer: Used to control liquid level in tanks, operated by float, which rises with liquid level and opens the valve to control water level. It can also remove air from system, in which case, air flows ... valve, float inside valve raises to close the valve and stop flow of water. Used in drip legs.

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Description : What is foot valve?

Last Answer : Answer: Valve used to maintain a head of water on the suction side of sump pump, basically a lift check valve with integrated strainer.

What is safety valve?

Description : What is safety valve?

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Description : What is relief valve?

Last Answer : Answer: Valve to relieve excess pressure in liquids in situations where full flow discharge is not required, when release of small volume of liquid would rapidly lower pressure.

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Description : What is sampling valve?

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Description : What is diverting valve?

Last Answer : Answer: This valve switch flow from one main line to two different outlets. WYE type and pneumatic control type with no moving part.

What is Quick acting valve?

Description : What is Quick acting valve?

Last Answer : Answer: Any on/off valve rapidly operable, either by manual lever, spring or by piston, solenoid or lever with heatfusible link releasing a weight which in falling operates the valve. Quick ... for water or for liquid service in general without a cushioning device to protect piping from shock.

What is Vacuum breaker?

Description : What is Vacuum breaker?

Last Answer : Answer: A special self-acting valve or any valve suitable for vacuum service, operated manually or automatically, installed to admit gas (usually atmospheric air) into a vacuum or low-pressure ... installed on high points of piping or vessels to permit draining and sometimes to prevent siphoning.

What is Throttling valve?

Description : What is Throttling valve?

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What is Spiral sock valve?

Description : What is Spiral sock valve?

Last Answer : Answer: A valve used to control flow of powders by means of a twistable fabric tube or sock.