Hot Water System, Purpose:
Hot Water System, The purpose of this SOP is to define the operation and maintenance procedure of Hot Water System of XX Pharmaceuticals Ltd.
Hot Water System, Scope:
This Standard Operating Procedure applies to the Hot Water System installed at the roof top of of XX Pharmaceuticals Ltd.
Definitions / Abbreviation:
[][]AHU: Air Handling Unit.
[][]Hot Water System: In HVAC system hot water system is used to produce hot water which is used in AHU’s hot water coil to reduce the relative humidity of air.
[][]H.W: Hot Water.
[][]PRV: Pressure Regulating Valve.
Responsibilities:
[][]The roles and responsibilities are as follows:
Engineering (Validation) Department
[][]Preparing the SOP and revise it when necessary.
Engineering (Maintenance) Department
[][]To provide necessary support for smooth operation of the system.
[][]To ensure that the operators are responsible to carry out the operation and fill up the logbooks.
Operator
[][]To operate the system according to the SOP.
[][]To fill up the log sheets.
Manager, Engineering
[][]To ensure that the system is operated properly.
Manager, Quality Assurance
[][]To approve the SOP.
[][]To ensure overall implementation of this SOP.
Procedure:
Precautions:
[][]All operation work must be done safely in accordance with the requirements of the Plant Safety Statement and the safety notices around the plant. Specific attention must be paid to the following:
[][]Do not touch the steam line with bare hands.
[][]Perform any kind of maintenance after switching off electrical power and also after cooling of hot pipe line.
[][]Use personal protective equipment and clothing as necessary at the time of performing cleaning/changing work.
[][]Be careful about the hot water line.
[][]Put the “UNDER MAINTENANCE” tag on an easily visible place of the system before performing maintenance.
System Description
[][]In hot water system the water of normal temperature is heated by exchanging heat with the steam. There is a plate type heat exchanger in this system. There is a safety valve in the inlet line of steam. If the steam pressure is more than 4 bar, the pressure will be released by opening the valve.
[][]The desired temperature of water can be set from the control panel. After being heated, the hot water is circulated to the AHUs and then back to the hot water systems by pump. There are two pumps for this purpose. Between these two pumps one stands by while another is running. There is a condensing unit in the system. This is used to store the condensate water.
Pre-start check
[][]The steam pressure before PRV should be 4 – 6 bar and after PRV it should be 1.5 – 2 bar.
[][]Compressed air pressure has to be 4 – 5 bar.
[][]Before starting the system, drain the water of condensing unit of hot water systems.
Starting Procedure
[][]Switch on main circuit breaker to give electrical power to the PLC.
[][]Press the button and then press the Green button on VSD to start the Hot water circulating pumps.
[][]The desired temperature of hot water can be set by pressing the up and down arrow key of control panel (see in the section 7.4.1).
During Operation
[][]The temperature of hot water can be set or changed according to the following steps:
[][]The temperature band can also be set
[][]During operation, fill up the log sheet for Monitoring of Hot Water System.
Stopping Procedure
[][]Close the steam inlet valve.
[][]Switch off the pump by pressing the red button on VSD.
[][]Switch off the main circuit breaker.
Preventive Maintenance of Hot Water System
Daily
[][]Check steam pressure.
[][]Check the water level in the hot water reservoir.
[][]Check and drain the water of condensing unit.
[][]Check the water level of expansion tank.
[][]Check for any type of leakage from hot water circulating pumps.
[][]Check if there is any vibration while running the pumps.
Weekly
[][]Check and tighten (if necessary) all the electrical connections.
[][]Check and clean all the pneumatic valves.
[][]Check and tighten all the connections of pumps.
Bimonthly
[][]Clean the float valve of condensing unit.
Monthly
[][]Check the insulation of steam line and hot water line.
[][]Check the bearing of pumps.
Annexure:
Annexure – I: Log sheet for monitoring of Hot Water Systems
Annexure – II: Log sheet for preventive maintenance of Hot Water Systems