Three pass steel hot water boiler

Hot water steel boiler

A hot water steel boiler is a device that transfers the thermal energy released by combustion fuel into the water inside it. This warm water circulates by the pump and loses some of its energy. As a result, the water returns to the boiler at low temperature and is heated again.

Important notes for choosing steel hot water

Generally, steel or hot water boilers use the combustion and heat burner and heat exchange at their thermal energy absorption levels supplying the heating required by the central heating system in industries, buildings and pools.

Types of steel hot water boiler

Steel hot water boilers are divided into types of fire tubes and water tubes, regardless of capacity, dimensions and pressure.

Fire tube

If the gases from the combustion are in the boiler pipes and the water around it is called fire tube.

Water tube

If water passes through the tubes and gases from the combustion surrounding it, it is called water tube. Water tube boilers are more common. the  water tube system is usually used for boilers with a capacity of 32 tons per hour and operating pressures exceeding 25 tones

Wet back

Due to the importance of heat exchange surfaces in boilers, some manufactures also use the bottom of the boiler to circular water and heat exchange to increase these heat exchange levels, which they call wet back boiler. Wet back boilers obviously have a higher cost and cost advantage than the wet back boilers in terms of cost and heat exchange efficiency. In important public service buildings such as hospitals, hotels, etc. Regardless of the type of boiler selected (boiler or steel spa boiler) central heating system is required as recommended by international engineering standards ;75% of the heating needs of the building to be installed so that in case of a breakdown or any problem for the burners or boilers even a single boiler alone can supply a major part of the heating and spa needs of the building concerned.

The difference between a steel hot water boiler and a hot water boiler

The most important difference between steel hot water boiler and hot water boiler is the high pressure work of the hot water boiler.

After selecting the desired boiler pot and before shipment to the boiler installation site, the foundation is leveled and properly sized so that the boiler can be directly rubbed into the foundation in the engine room after shipment.

Pars dama industrial group three passes steel hot water boiler

PDHWB3 model of Pars dama three passes steel hot water boiler is in two types of dry back and wet back and based on BS2790 and ISIRI 7911 standards which is designed and manufactured under the supervision and inspection during the construction of standard quality inspection company.

The usages of Pars dama three passes hot water boiler

In residential construction projects such as three-passes hot water boiler (three- pass hot water boiler in Alborz Karaj province) and Tehran province members of Alborz province engineering system for their projects in industrial, residential, food and agricultural greenhouses and etc. are used to produce hot water for heating systems with very high thermal efficiency.

Fuel boiler hot water three passes

Three pass steel hot water boiler can be used with burner or gas fuel or gas or double burner depending on the conditions of each location.

This example of Karaj boiler is used for many projects.

Standard of material and type of steel and hot boiler design

According to generally accepted international standards for the construction of steel boilers of body material, furnace or combustion chamber and networks shall be of alloy steel for the manufacture of pressure vessels and heat vessels in accordance with DIN17mn4 or ASME 516/G70 and for pipes or boiler tubes using seamless fire sticks DIN st 35.8.

One of the most important points

In designing and producing steel hot water boilers (hot water and steam) in addition to conforming to all parts of construction, implementation, parts, control, access, testing and … to the recognized standards of compliance and approval of each boiler with executives drawings and design guidelines are smarter than internationally recognized brands.

In other words, the mere use of high quality alloy steels and firefighting pipes mentioned above alone cannot guarantee the performance, efficiency and useful life of the boiler, but rather the construction of the boiler using approved drawing and procedures defined and accepted by international standards.

Important tips for installing hot water steel boiler

Installing water softener machine

Installation of water softener or desiccant machine is required in motorhomes using steel hot water boilers or hot water boiler.

Concrete foundation

Due to the fact that all the main equipment of the plant including central heating boiler are installed on a precast concrete foundation with proper dimensions according to the layout plan and precisely where the equipment is installed so before installing the main equipment of the plant such as steel hot pot incorporate the required concrete foundation to the specified dimensions and standards. Installation of a thermometer, manometer is required to display the hot water temperature in the boiler as well as the pressure of the building heating system on each steel boiler of the engine room.

Submerged thermostat

Installation of submerged thermostat (submerged agostat) with temperature range of 30 to 90 ⁰ c or 30 to 110 ⁰ c is required to adjust the boiler temperature and the on-off steering wheel to the burner relay on each steel boiler.

Reliable valve

Also install at least one safety valve ant at least one submerged thermostat (submerged agostat) with a temperature range of 30 to 160 ⁰ c or more (based on hot water boiler operating temperature) to adjust the boiler temperature and on-off control to the burner relay on each hot water boiler is necessary.

Factors that increase the life span of hot steel boilers 

Design and construction of the boiler

Design and construction of the boiler on the basis of approved manufacturing plans as well as in accordance with the applicable operating instructions and procedures provided by international standards.

Use of alloy steels

The use of alloy steels and fireboxes as mentioned above, the sufficient thermal surface of the tubes, the number of steel hot water boiler passes.

Use of resin water softener

Use suitable resin water softener with a volume of water circulating the heating system or installing a disinfectant on the pipes of sufficient size and quality.

Valves

Head hole, hand hole and man hole valves with proper dimensions in places needed for inspection and periodic service and even replacement of damaged tubes during operation.

Select the appropriate number and capacity of the central heating boiler

Select the right central heating boiler number and capacity so that central heating boiler building is not required for continuous heating and hot water even during the oldest of years. (for example, in sensitive public service buildings such as hospitals, hotels, government centers, large residential complexes, the required heating capacity should not be left on a single steel hot water boiler, and in addition a ready to operate steel boiler is always required. Reservations are also provided for emergencies.

Torch selection

(Selection of burner with calculated capacity suitable for boiler heating (up to 20% more than steel boiler capacity

Flame torch

Flame torch adjustment (blue burning and longitudinal direct flame torch flame in a steel hot water boiler.

Inspection and service

Periodic inspections and services, especially on how to burn the burner in a steel hot water boiler.

Gasoline torch

If using a gasoline burner, the type of fuel injection angle of the gasoline burner nozzle shall be determined based on the diameter and length of the boiler combustion chamber as recommended by the boiler manufacturer.

Chimney

Accurate calculation and execution of chimney in terms of diameter and height of smoke suction due to combustion air volume.

Pars dama three passes hot water steel boiler capacity

Pars dama hot water boiler capacity is between 5.000.00 kcal/hr to 120.000.000 kcal/hr. with temperature working to 120 ⁰ c and designed and build in two levels of 6 bar or 8 bar.

Pars dama three passes hot water steel boiler belongings

Torch fits the capacity of the steel boiler

Digital display thermostat

Electrical panel and control

Feature of designing three passes hot water steel boiler

Fire tube, wet back

X pressure working on steel hot water boiler

۱۶ bar to designing pressure

۲۰ bar to test pressure of steel hot water boiler

۲۵ bar designing standard

Feature of designing three passes hot water steel boiler

Sheet features and fire grill BS/2790-1992

Seamless tubes according to DIN 17175-st 35.8

Welding in accordance with DIN standard

Characteristics of the electrodes used in a steel hot water steel boiler: preheat A.W.SE 7018

Welding body of grid and body: submachine fully automatic

Fire tubes features: 17Mn4