Skip to main content

Sprinkler system testing procedure

  • Close the section isolating valve, this will raise an alarm indicating zone isolation
  • Now, open the test valve, if no water comes out, then it means the NR valve placed after the section isolating valve is not leaking.
  • Since, the section after the NR valve remains pressurized, opening of the drain valve will cause the water pressure in the section line to decrease. A pressure switch sensor senses the decreased pressure & raises an alarm.
  • Now, close the drain valve, open the section isolating stop valve. To check the flow switch, open the flow test switch to activate an alarm.
  • Allthe above alarms will be indicated on the navigation bridge, E/room as well as in the Fire Control Room. The alarm will also indicate the particular zone from where it has risen.
  • Ifall the alarm conditions are satisfied, close all the testing valves, open the section isolating valve, purge the sprinkler line by air and again keep the line pressurized. Check from the pressure gauge, that proper pressure has been maintained or not

Comments

  1. After reading the post , I got some descriptive information which is very helpful for me. Thanks for posting it. Keep it up. Sprinkler companies Maumee

    ReplyDelete
  2. Visit Fire sprinkler systems are a critical part of any building's safety system, as they provide the necessary water pressure to activate the sprinklers in the event of a fire.

    ReplyDelete

Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as minor is along the  direction of maximum stress.

Shell Expansion Plan

It is a two dimensional drawing of a three dimensional surface of the ship’s hull form. This plan is very useful for the following information:It is used for marking the location of a hull Damage on this plan by identifying the strake number , letter and frame number so that the exact location of the damage and also suggested repairs are marked in a localised copy. The shell expansion can be used for finding areas of painting surfaces such as topside, boot topping and bottom areas by applying Simpsons rules directly.  In the shell expansion the vertical scale used is different from the horizontal scale and a suitable adjustment has to be made when calculating areas. This becomes useful in solving disputes concerning areas of preparation and painting. It gives information on the thickness of the original strake which is indicated by the number in the circle shown in the strake.  The quality of steel used is also shown by letters A,B,D E and AH, BH,DH, EH.