We offer all available sizes of ASME rated U-Tube Heat Exchangers ("Bundles") in our Hot Water Storage Tanks. Given the required amount and temperature of hot water required, we can calculate the size of bundle needed and in most cases install it in the tank before shipment. The standard construction is carbon steel with .75" copper tubes, but options such as stainless steel or cupro nickel components can be added as required.

Tube bundles can be single or double walled, dictated by the use of the building and local regulations and are installed into a collar that is welded into the tank during production. We normally upgrade to a stainless steel collar in glass and cement lined tanks. This ensures that there are no quality issues with the tank lining inside the collar.

Heater bundles can be installed in both horizontal and vertical tanks and are sized for the most economical dimensions and price that meet the hot water demand.

We also install customer supplied single wall heater bundles and/or unassambled flange/collars that have ASME certs.

In most cases we prefer to furnish the collar and usually stock flanges up to 14" diameter. Bundles for installation must be received complete with head, nuts, bolts and gasket. Please inquire about larger sizes, which will include extra costs related to blankoffs for pressure testing and shipping as necessary.

We do not install double wall bundles as they are likely to be damaged during shipment.

Longer bundles often need a support. When required, we install one in the most effective location.

A typical temperature rise in a hot water generator is 40 to 140^o but this can vary according to local conditions and requirements. The most common heating media in the bundle tubes are 180^o pumped boiler water or 15 psi steam. Once again, these are different in many cases and are dictated by the original system design.

Some heat exchangers in cogeneration applications use waste or surplus heat to pre-heat domestic water or even power underfloor heating.

The size and cost of a bundle is less if the water is circulated or agitated. We usually include a recirculation connection in the heater collar to achieve the most efficient bundle performance and to avoid local "hot spots". Stagnant tanks are not as effective and need a larger bundle to compensate for this. We can calculate sizes required in both cases for a cost comparison to be made.

We install bundles manufactured only by major manufacturers such as Armstrong and ITT Bell & Gossett with whom we have OEM status. This guarantees that the Heat Exchangers we supply are of the highest quality at the best prices. Although deliveries are very prompt at 3-4 weeks, expedited delivery is available if required.

To size a bundle correctly, the following information is needed:

1) The amount of hot water required ("demand") in gallons per hour.
2) The incoming (cold) water temperature.
3) The outgoing (hot) water temperature.
(The difference between 2) & 3) is known as the "Delta T")
4) The heating medium supplied in the heat exchanger tubes- Steam or Water.
4a) If Steam, its pressure after the regulator.
4b) If pumped Boiler Water, its temperature and GPM if available.
5) If a single or double wall bundle is required.
6) Whether the tank is agitated or not.
7) Tank size and orientation.

All this information is necessary for the most cost effective bundle sizing. The minimum amount of Boiler Water needed will be stated.

TERMINOLOGY

Agitated:

See Circulated.

Bonnet:

The cap on the outer end of the bundle.

Bundle.

The heat exchanger unit. Aka Tube Bundle.

Circulated:

Hot water is pumped through the tank constantly.

Cogeneration:

Utilizing heat that is a byproduct of another system.

Coil:

The heat exchanger unit.

Collar:

A short pipe that is welded into the tank and houses the bundle.

Delta-T:

The required increase in temperature from cold to hot water.

Double wall:

Tube and tube sheet design that prevents boiler water from contaminating the hot water supply in the event of tube leakage.

Flange:

The part welded to the outer end of the collar that the bundle is bolted to.

Fouling factor:

An allowance that increases the size of the bundle to ensure that demand is met even if the tubes become coated with residues from the water.

Recirculation:

Hot water is pumped throughout the building constantly. If so the tank is defined as circulated or agitated.

Pass:

The number of times the heating medium travels the length of the coil. Two pass is standard. Four or six pass is sometimes necessary.

Tube Sheet:

A circular plate that has the open ends of the tubes installed into it.

Tube support:

A bracket installed in the tank during production to support the bundle.

U-Tube:

The shape of the bundle. The letter "U" laid on its side.

SIZE
Dia x Lgth

GALLS

PRESSURE
psig

WT#

SQ.FT

DRAWING / PART#

COLLAR SIZE

LINING

INQUIRE PRICE

30" x 62"

170

150

427

44

6"

GLASS

36" x 68"

260

150

545

58

6"

GLASS

36" x 72"

285

125

602

62

6"

EPOXY

36" x 84"

348

150

707

71

14"

EPOXY

36" x 94"

381

125

812

78

10"

EPOXY

48" x 73"

500

125

1190

85

6"& 8"

GLASS

42" x 96"

534

150

1020

94

10"

GLASS

42" x 96"

534

160

1145

94

6"

GLASS

42" x 110"

600

125

1275

108

10"

GLASS

48" x 112"

800

125

2087

127

8"

CEMENT

54" x 90"

803

125

1817

117

12"

EPOXY

48" x 138"

1000

125

1980

154

12"

EPOXY

54" x 115"

1040

125

1786

146

8"

GLASS

54" x 135"

1225

125

2096

171

10"

GLASS

SIZE
Dia x Lgth

GALLS

PRESSURE
psig

WT#

SQ.FT

DRAWING / PART#

COLLAR SIZE

LINING

INQUIRE PRICE

24" x 72"

130

125

445

40

4"

GLASS

30" x 72"

200

125

338

51

6"

GALVINIZED

36" x 98"

400

125

1379

80

8"

CEMENT

48" x 73"

500

125

1812

86

10"

CEMENT

48" x 106"

750

125

1460

120

8"

EPOXY

48" x 106"

754

150

1676

121

8"

GLASS

60" x 130"

1400

125

3440

184

12"

CEMENT

60" x 128"

1450

125

3111

183

8"

CEMENT

72" x 144"

2285

125

5500

246

10"

CEMENT