CRITICAL PIPING AND LP PIPING ERECTION - ABC OF THERMAL POWER STATION

Till last blog I have tried to explain basics of thermal power stations including enviormental

requirement , land requirement , soil testing , other aspect of information required initially for

civil design , discussed about civil works requirement ,fabrication and erection of structural

items , Boiler and its auxiliaries erection, ESP erection and a brief on commissioning of ESP.

In 107 blogs above aspects were covered . I am writing the blog for new comers to construction

field so that they will have an idea about a power station. I received number of mails on my

mails from different sources i.e students , newly appointed construction people etc and I tried

my best to answer their questions . I learn a lot from their questions and I do hope all the readers

will participate in question and answer on the topics.

Today I will start to discuss about critical piping and LP piping of a thermal power station.

Piping involves lot of welding ,NDE , pre heating ,post heating ,stress relieving etc and its

a vast subject to cover. However my endeavour will be to give basic knowledge required for

piping erection.

-Critical Piping scope covers following work in general-

-Complete main steam, hot reheat & cold reheat piping between boiler and turbine nozzles,

HP bypass upstream & downstream piping and LP bypass upstream & downstream piping up

 to the condenser  inlet nozzles- as per P&ID finalised during the detailed engineering.

-Complete auxiliary PRDS & Aux. Steam piping system up to Terminal Point.

-Interconnection of Auxiliary steam piping with existing stage (s) as per scope indicated in tender

 drawing, along with necessary trestles.

-Spray piping system for the following , :

(1.)       Re heater attemperation,

(2.)       Super heater attemperation

(3.)       Auxiliary PRDS system

-Steam drains from piping /equipment(s) such as. flash Tank(s) / flash tank

  manifold(s) as per the scope .

 -  Miscellaneous line drains and vents.

- Complete safety valve exhaust piping for SVs / SRVs on piping/equipment .

The Scope of Low Pressure (LP) piping shall cover piping systems for the following services.

(a.)       Boiler fill system.

(b.)       Equipment Cooling Water (ECW) system including its chemical dosing system (both

primary and secondary)

(c.)      Service water cum CW blow down system

(d.)      Instrument Air System.

(e.)      Service (plant) Air System.

(f.)       Drain piping system for the piping\equipment etc.

(g.)      Tanks as described elsewhere in the specification for the above systems.

(h)        Air preheater wash water system

(i)         Re-circulation pipes along with valves, breakdown orificies etc.,

CONTINUED

P.S If  you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below

LINK 1 - PLEASE CLICK HERE 
LINK 2 - PLEASE CLICK HERE