Pressurized Expansion Tanks (ASME) - Azurecorp

1 SAFETYINSTRUCTIONSThis safety alert symbol will be used in this manual to drawattention to safety related instructions. When used, the safetyalert symbol meansATTENTION! BECOME ALERT! YOURSAFETY IS INVOLVED! FAILURE TO FOLLOW THESEINSTRUCTIONS MAY RESULT IN A SAFETY Expansion Tanks contain either a bladder or adiaphragm to separate the air charge from the system are designed to absorb the Expansion forces of heating/cooling system water while maintaining proper systempressurization under varying operating conditions.

2 NOT FOR USE IN DOMESTIC(POTABLE) WATER SYSTEMSDANGER:Domestic, potable or fresh water can causeserious corrosion in a tank. This can result in leakage and a potential explosion. Do not use for domestic, potable or fresh water. Failure to follow this instruction will result in serious personal injury or death and property LIMITSM aximum Operating Pressure: 125 psiMaximum Operating Temperature: 240 FINSTRUCTION MANUALA01500 REVISION GBELL & GOSSETTP ressurized Expansion Tanks ( asme )Installation, Operation, & Service InstructionsINSTALLER:PLEASE LEAVE THIS MANUAL FOR THE OWNER S & GossettSeries "D"Series "B"WARNING LABEL PART NO.

3 V56874 INSTALLED IN THISLOCATION. IF MISSING, IT MUST BE INSTRUCTIONSA. GeneralThe Pressurized Expansion tank-to-system piping differs from the standard compression tank piping in several major from the system must be purged to the atmosphere and notallowed to enter the Tank-to-system piping must not be pitched-up to the Shut-off and drain valves must be installed in the tank-to-system piping in order to properly check and recharge the tankair after the system has been filled with Airtrol Tank Fitting (ATF or ATFL) is not PipingTypical tank-to-system and air vent piping are illustrated byFigures 1 thru 4.

4 Some general notes regarding this piping arelisted connection point from tank-to-system represents the pointof no pressure change. This means that the Expansion tankmust be connected as close as possible to the suction side ofthe system circulating pump for proper system The branch piping to the tank must be attached to the main tominimize the possibility of air and debris entering the tankpiping. If connected to the horizontal main, do not use top (12o'clock) and bottom (6 o'clock) positions. Side connections arethe proper positions.

5 If connection must be made at thebottom, a dirt trap leg with a flushing drain valve, such asshown in Figure 4, should be Table A shows the recommended pipe sizes. Note that theMBH column represents the output of the heat generator (firingrate, etc.). The pipe sizes are selected for very low pressureloss in the tank-to-system piping to accommodate systemoperating pressures within 10% of the relief valve , if the actual system operating pressure is less than80% of the relief valve setting.

6 The tabulated pipe size above 1"may be reduced by one sizes 1" or less must not be changed due to the greaterpossibility of fouling in the smaller In order to change the tank air charge pressure it is necessaryto isolate the tank circuit from the main system piping. A highquality, gate type, lock-shield valve must be used for this pur-pose. The lock-shield for the valve stem will eliminate tamperingof this normally open valve during normal system In addition to the lock-shield valve above, a drain valve,automatic air vent and a pressure gauge must be installed inthe piping.

7 The drain valve is used for flushing (item 2 above)and to drain the water out of the tank for proper air Tank sizing calculations are based on minimum temperaturerise of the air in the tank. For this reason, an anti-thermosyphonloop must be formed in the tank-to-system piping to minimizethe effects of gravity (thermal) circulation into the tank. A dropleg from 12" to 20" long is usually sufficient. It is alsosuggested that this piping and tank not be insulated (heatingsystems only).7. Allow an overhead clearance for the Series B of at least 18" toremove the bladder through the flanged opening in casereplacement is required.

8 For bladder replacement of the SeriesB-PA Tanks , the tank must be removed from the INSTRUCTIONS1. Check the Expansion tank pre-charge before the system isfilled with water. The charge is 12 psig unless noted otherwiseon the tank label. Check to make sure this is the correctprecharge pressure specified for the If the tank pre-charge pressure needs to be changed on a drysystem follow the following procedure:a. Check the Expansion tank air pressures at the prechargeconnection with an accurate tire type pressure gauge.

9 The pre-charge connection is the same kind of connection found on automobile If the pressure is low, charge the tank with nitrogen gas or with oil-free compressed air. Check the pressure frequently during this process as you would when filling a tire with If, after the system has been filled with water and operating, itis found that the Expansion tank pre-charge must be changeduse the following procedure:a. Turn off the heat source and allow the system water to cool to ambient Close the lock-shield valve in the tank-to-system Open the drain valve to empty the water from the Check the tank air pressure at the pre-charge connection with an accurate tire type air Refer to 2b Close the drain valve, open the lock-shield valve and turn on the heat Relock the lock-shield : Pump cavitation and unbalanced circuits can result from improper tank location.

10 Connect tank asclose to suction side of system circulating pump as to follow this instruction could result in property damageand/or moderate personal :A blocked connection to the Expansion tank will cause system to become overpressurizedresulting in periodic discharge of system relief valve. Thisperiodic discharge will require that fresh water be added to thesystem to maintain pressure. The resulting addition of freshwater will cause corrosion in system components. The use of abottom connection to the main requires the use of dirt trap legwith a flushing drain valve.