Heat Network Design

General Instructions

These detailed drawings for the construction of the heating network are based on:

- Design tasks No. "Firm" CJSC. "

- Technical specifications for connection to PMT heat networks ""

- Topographic survey M 1:500 at:

- Current SNiP chapters for design.

- Requirements of rules for arrangement and safe operation of steam and steam pipelines

hot water Gosgortekhnadzor of Russia 2003

The heat carrier - superheated water with the parameters T1=150oS, T2=75oS.

Design coolant pressure Pp = 16 kg/cm2

Design temperature of external air minus 26 wasps.

Pressure of transported coolant _____ 7.5 _________ kg/cm2

Design heat flows ______ 2.912 _____ Gcal/h

Heat losses of normative ____ x ________ Gcal/year, estimated 70 Gcal/year.

Heat supply source -

Connection point - UT8 chamber on intra-quarter heat networks.

Altitude system - Baltic

In accordance with the "Rules for arrangement and safe operation of steam and hot water pipelines," the designed pipeline belongs to category IV.

For the installation of the heating network, steel pipes and shaped parts were adopted in the project in accordance with the "Rules for the construction and safe operation of steam and hot water pipelines," approved by the Gosgortekhnadzor of Russia in 2003 and the guidelines of the RMTGII (049) 98 Institute "Lengiproinzhproekt."

Installation, testing and acceptance of heat networks shall be performed in accordance with the following regulatory documents:

PB 1057303 "Rules for arrangement and safe operation of steam and hot water pipelines";

PT TU 2003 "Rules for technical operation of thermal power plants";

SNiP 41022003 "Heat Networks";

SNiP 3.05.0385 "Thermal networks";

SNiP 41012003 "Thermal insulation of equipment and pipelines"

SP 411052002 "Design and Construction of Heat Networks of a Channel-Free Steel Pipe Gasket with Industrial Thermal Insulation of Polyurethane Foam in Polyethylene Shell"

After installation and attachment of heat conductors on permanent supports, perform flushing and hydraulic test for strength and tightness (in accordance with SNiP 3.05.0385) with pressure equal to 1.25 working, but not less than 16 kg/cm2.

All elements of the linear part of the heating line used for channel-free, channel and case gaskets, such as pipes, branches, bellows compensators, panel fixed supports, are supplied in thermal insulation from polyurethane foam with a hydroproofing coating of polyethylene with the UEC system. Pre-insulated components in factory conditions are delivered in accordance with the following regulatory documents:

Pipes - TU 5768-006-70629337-2004

Motionless support are TU5768-004-70629337-2004

Shaped parts as per GOST 30732-2001

Insulation of joints of pre-insulated pipelines shall be performed as per 313TS00200 AOOT "VNIPIenergoprom Association" album.

Steel pipes to be laid in the soil without SGP insulation shall be covered with corrosion protection coating of "very reinforced" type as per GOST 9.60289 *.

Design and estimate documentation is made in accordance with the current norms, rules and standards, including explosion and fire safety.

Explanatory Note

The design adopts channel gasket of heating system 2 Du125 in insulation from polyurethane foam of factory manufacture with longitudinal drainage. The designed heat network is ~ 50 m/tr long.

Types of heat network gaskets and structures, adopted in accordance with the album A39780 of the Institute "Lengiproinzhproekt" and the album 313TS 002.000 AOOT "Association VNIPIEnergoprom" "Typical solutions for laying pipelines of thermal networks and insulation from polyurethane foam Du 50-1000."

Sections of gaskets are given in drawing TC1 .

Compensation for thermal elongations of heat conductors is carried out using natural compensation at the angles of rotation of the heating network route laid in impassable channels .

Fixed supports are provided for fixation of pipelines in sections between compensators.

In the lower points of the heating network there is an installation of devices for lowering water from the system, and in the higher points there is an installation of air vents. The pipelines are emptied in the UT8 chamber through the drain valves to the existing sewage system. Installation of steel shut-off valves at pressure of not less than 16 kgf/cm2 with service life of not less than 25 years is provided on the main line, vents and vents.

Steel pipelines of closed outlet outside the chambers shall be made in insulation of "very reinforced" type based on extruded polyethylene as per specification 13940024739439099.

Cover the surfaces of wells in contact with the ground with walls and slabs with bitumen dissolved in gasoline.

Insulation of heat pipelines, pipelines for water lowering to valves, air outlet and valves in heat chambers shall be performed in accordance with STU No. 504 dated 22.03.2004.

The pipes which are previously isolated industrially pay off for the term of operation of 25 years on condition of quality ensuring their installation and also at quality of the network water meeting standards of boilers (an album 313.TC007.000 Paragraph 8.2).

The release of thermal network in the system of the all-floatable sewerage is allowed after cooling of water up to 40 wasps.

Installation of electrically insulating sliding and stationary supports is provided for passive protection of heat network pipelines against electric corrosion.

With pipes, materials, all reinforced concrete and metal structures, construction is provided by the general contractor from its production bases or warehouses, as well as directly from plants of the corresponding profile.

Materials and products are delivered by road through the existing road network.

Construction Organization Project

Earthworks

Before earthworks perform rustling of crossed communications. Soil development in trenches and pits is carried out by an excavator with a reverse shovel.

Cleaning of trenches for heating and drainage is performed manually.

In order to preserve the structure of the heating network laid under the roadway, fill the trenches with sand to the crushed stone base.

When filling pipelines above the top of the polyethylene shell of pipe insulation, it is mandatory to install a protective layer of sand soil with a thickness of at least 150 mm.

not containing solid inclusions (crushed stone, stones, etc.) with layer-by-layer compaction. (especially the space between pipelines, also between pipelines and trench walls). Joints are filled after hydraulic test.

Piping Bases

The structure of the base for the heating system pipelines is shown in the drawing TC1.

Actual elevations and slopes must be made according to the profile.

Installation of structures

Before laying a channel or insulated pipes in a channel-less laying, the sand base must be aligned.

Piping installation is performed by means of crane or pipe laying, the type of which is specified in WP. Elements of precast reinforced concrete structures (channels, pits, wells) are assembled on mortar. Pipes are welded by arc welding, electrodes not lower than E42A class. Before connection, the internal cavity of the laid pipes must be checked and cleaned. During work interruptions, end faces of laid pipelines shall be closed with blankings .

Safety precautions

Special attention should be paid to the safe conduct of work near existing electric and telephone cables, gas pipelines, water pipelines and other underground structures .

Before starting excavation work, it is necessary to identify and designate on the ground the routes of existing underground communications. Excerpt and backfilling of existing structures is carried out in the presence of representatives - owners of these structures, whose requirements are mandatory.

During the work, firefighters should be able to travel to all buildings and structures.

All construction and installation works must be performed in accordance with the requirements: "Labor safety in construction." Part 1. General requirements of SNiP 12032001, part 2. Construction production of SNiP 12042002.

Warning signs and inscriptions should be placed on driveways and streets, fences should be made, directions of detours and bypasses should be indicated. Protect the work areas as per GOST 2340778 clearly visible at any time of the day. Safety and health measures at workplaces and site as a whole shall be developed in detail in the PPR, organization of leading work.

Energy demand

During construction within the city, electricity needs are provided from sources of utility consumers under an agreement with the owners. When operating in an undeveloped part, mobile power plants are used.

Water for hydraulic testing and flushing of pipelines is provided by the contractor from existing heating networks or water supply networks.

Protection against electrochemistry. odk system

The project of active protection of the heating system from electrochemistry will be developed at stage "P." The design of the CSTO system has been completed. UEC section.

Environmental protection activities

The heat pipe is not a source of environmental pollution.

During construction and installation works, in order to protect the environment, it is necessary to fulfill the following conditions:

mandatory compliance with the boundaries of the territories allocated for construction;

equipping workplaces and construction site with inventory containers for household places and construction waste;

use of special installations for water heating, materials only;

The discharge of petrol, oil and lubricants only in designated and equipped locations;

full implementation of measures to preserve green spaces;

Compliance with local conservation authorities.

After completion of the main works, the construction organization shall give

terrain design relief or restoration of natural.