Answer Posted / sebastian

ESD valve or EIV(Emergency Isolation valves) are only used
(operates)for Emergency conditions only, usually theses
valves are reamins open till incase any Emergency occures
that is fire .some times it remains open till plant next
turnaround@3-4 years).so valve trim or actuator may stuck
due to some reason and valve never clos when real
Emergency, to avoid this situation , goverment athority or
insurance company guidlines are given to plant operation
section to check availablity and functionality of ESD
valves periodically, may be each 3 month, 6 month etc.
Partial stroke: Valve start to move from its open position
to close postion only @20-25% of its total traval(to avoid
process upest)and return back.there is a Function logic
built in the ESD logic with Protection timer(incase valve
limit switch not moved from open postion at set time the
logic will re set for valve its open condition and
indicate failed.(partial stroke test failed) .
if valve moved from open position (by means of limt switch
leves its contact)logic will re set and remais for open
position and indicate succes test.
if any details requred with logic contact me
sebalukose@gmail.com

How to change dcs card in online. (Dsc is maxdna)

2822

---

What is the use of control cable?

1205

---

Name different types of bourdon tubes.

1195

---

Tr. Wiring for calibration.

2122

---

A flange is used for instrument connection for a system with a design temperature of 316C (600F) and a design pressure of 1000 kPa (145 psi). What is the class rating of the flange to be used for this application? Explain your answer

2728

---

is motorized valve closed when power shutoff?

1791

---

List three types Level Gauges with their working principles

2126

---

What is force balance principle?

1224

---

any questions on motor and energy conversions machines?

2279

---

How it the difference between force balance system and dispalacement balance system?

2149

---

how do calibrate the valves.. with clear manual

2137

---

Why thermo wells are used? What materials are used in thermo wells?

1171

---

How to calibrate an pressure gauge with yantrika test bench?

2945

---

I have 0.75mm sq multicore cable (IS type) , can use instead of same type but 1.5 sq mm cable ? Note : The distance is around about 150 meter.

1626

---

What is the meaning of wet leg

1327

---