Hanson Tanks Cad Drawings

Roy E. Hanson Jr. Mfg. Specifications and Tank Drawings Sitemap     


Hanson Watertank with Manway

*Incorrect installation can cause rapid failure of water tanks due to electrolysis. It is vital that this risk is reduced by the use of dialectric connections and isolation of the tank supports. Installers must be aware of the correct procedures. For assistance call 1 (213) 747-7514. To be certain all dialectrics are correctly installed, check the final installation with an ohm meter. There must be no circuit between a pipe and the empty tank.
*Always refer to packing slip for additional instructions.
*FNPT connections have plastic plugs installed for shipment. They must be replaced with permanent fittings before the tank is filled.
*The tank should be installed in such a manner, that should the tank or any connections to it leak, the resulting flow of water will not cause damage. All tanks will eventually leak.
*A good policy is to monitor the condition of the inside of the tank periodically, so that any deterioration of the lining can be repaired.


*These linings are applied in multiple coats over a sandblasted surface. They contain organic solvents that have a distinctive odor. Our epoxy lined tanks are force cured by hot air before shipping, but it is also advisable to leave them open for as long as possible before start-up, so that the solvent has evaporated and any odor is gone beforehand. This is particularly important if hot water is likely to remain stagnant in the tank for long periods, especially if the use is such that any trace of taste or odor is unacceptable. Once immersed, any residual solvents take much longer to disperse.
*After installation, fill the system and run at operating temperature for at least one day in closed loop mode. Then drain system, open tank, and wipe clean. Very often the installer has pipe dope left in the tank. This can cause odor.


*Anodes should be checked 12 months after start up. Their original diameter is 1-5/16". Should their diameter be reduced by 50% or more, they should be replaced. After the first check at 12 months, a schedule should be established for future checks.
*We supply 25 grams of anode per square foot of tank area (glass lined tanks only).
*Replacement anodes are available; please specify rigid or flexible (all 1-5/16" diameter).


*Cement lined tanks must be kept closed so that the cement can remain moist and will cure without cracking. When installation of the tank commences, add more water to the interior, so the cement will continue to remain moist. The cement lining should never get completely dry. Please observe the sticker near the manway. If the lining is inspected and repaired at least every three years while in service, its life will be lengthened substantially.


Buffer tanks increase efficiency by adding extra volume of water into the system so that the boiler or chiller on/off cycles occur at the most cost effective intervals.

As in the first paragraph, and installed in the appropriate position in the system for maximum efficiency. Sized per industry standards. (For help in sizing, please contact the Factory).

Manway Installation

Manway covers and gaskets on new tanks are shipped in place so they will not be lost in shipment. The bolts are not tightened completely so that the tank can be opened and cleaned prior to service. Once the manway bolts are fully torqued, the gasket often cannot be reused.

The gaskets may shift due to vibration in transit. Manway covers are installed for shipping only, and must be adjusted and tightened both before and after the tank is pressurized.
Replacement gaskets are available.

Gasket Installation Instructions
  1. If a replacement, remove old gasket and thoroughly clean the ring surface on the tanks and on the cover plate.

  2. Place gasket on cover plate. Do not use any grease, lubricant or adhesive. The gasket must cover the surface of the ring 100% and project slightly on each side of the ring.

  3. Install gasket and cover plate. If the cover plate is off-center, the concentrated forces on the gasket can cut it.  Two people may be required to install a gasket in a vertical plane; one person will hold the cover plate and the other will center the gasket. Set crabs and tighten nuts only enough to provide a tight fit. Make them hand tight then snug with wrench about 1/2 turn. Never over-compress the gasket.

  4. If the gasket leaks while pressure is being built up, tighten it only enough to stop leakage. Make sure that the gasket is still centered on sealing surface.

  5. After the tank is at pressure, it is important to keep the nuts snug thereafter just to prevent vacuum or changes in pressure from pulling the cover in and causing a leak.

  6. Since the installation and use of gasket is beyond our control, we cannot guarantee the results, whether or not such use is in accordance with directions.
Note: Gaskets will deteriorate from high temperature and age.
The tank must be installed in such a manner so that, should the tank, or any connections to it, leak, the resulting flow of water will not cause damage.

*Copies of the submittal specifications are available on request: Hanson A.S.M.E. Water Storage Tanks, Epoxy Lining, Glass Lining, Cement Lining, and Insulation (foam with topcoat or fiberglass with metal jacket).


All our bag tanks are shipped with a 12# air precharge. Before installation, check that it is within the range of 9-15 lbs at the charging valve with an accurate gauge. If it is not within this range, or any other questions come up, call factory at (213) 747 7514.

If OK, set the tank in place and connect the piping. Do not remove the top plug or loosen the nut on the cover plate as this will result in the loss of the precharge. (On top outlet tanks the plug is located on the bottom of the tank). The precharge should set at 5 lb below the minimum system pressure during installation while the system connection is open to atmosphere.

Before filling the tank, the precharge can be adjusted up to 80 psi for a 125# system. If a higher pressure unit has been supplied, the maximum allowable precharge will be indicated on the tank. Check all connections, plug and cover plate thoroughly for leakage before startup. All valves in the supply line must be fully open to purge any residual air from the piping to make sure the bladder is filled 100% with water.

Standard commercial water storage tank installation procedures must be followed without exception. Water leakage from the tank for any reason must be contained to prevent damage to its surroundings.

Failure to follow these instructions may void your warranty.

Roy E. Hanson Jr. Mfg., rev December 2012.