Relay Pumping Operations

TOPIC: RELAY PUMPING OPERATIONS TIME REQUIRED: ONE HOUR MATERIALS: APPROPRIATE AUDIO VISUAL SUPPORT REFERENCES: PUMPING APPARATUS DRIVER/OPERATOR HANDBOOK, FIRST EDITION, IFSTA PREPARATION: MOTIVATION: OBJECTIVE (SPO): 1-1


TOPIC: RELAY PUMPING OPERATIONS

TIME REQUIRED: ONE HOUR

MATERIALS: APPROPRIATE AUDIO VISUAL SUPPORT

REFERENCES: PUMPING APPARATUS DRIVER/OPERATOR HANDBOOK, FIRST EDITION, IFSTA

PREPARATION:

MOTIVATION:

OBJECTIVE (SPO): 1-1

Given information from discussion, handouts, and reading materials, explain the pump operator's responsibilities to pump a supply line, given the length and size of line, flow and desired intake pressure, so that adequate intake pressures and flows are provided to the next pumper in the relay. The student will perform to a written test accuracy of at least 70%, successfully complete the skills on a skills check-off list, and meet the job performance requirements of NFPA 1002 (1998).

OVERVIEW:

Relay Pumping Operations

   • Relay Apparatus and Equipment

   • Relay Pumping Operational Considerations

   • Types of Relay Pumping Operations

   • General Guidelines for Relay Operations

RELAY PUMPING OPERATIONS

SPO 1-1 Given information from discussion, handouts, and reading materials, explain the pump operator's responsibilities to pump a supply line, given the length and size of line, flow and desired intake pressure, so that adequate intake pressures and flows are provided to the next pumper in the relay. The student will perform to a written test accuracy of at least 70%, successfully complete the skills on a skills check-off list, and meet the job performance requirements of NFPA 1002 (1998).

EO 1-1 Determine what apparatus and equipment are required to design a relay. (NFPA 1002 (1998), 3-2.2, 6-2.2)

EO 1-2 Describe the various considerations associated with relay operations. (NFPA 1002 (1998), 3-2.2, 6-2.2)

EO 1-3 Describe the various types of relay operations. (NFPA 1002 (1998), 3-2.2, 6-2.2)

EO 1-4 Describe the basic operating guidelines for a relay. (NFPA 1002 (1998), 3-2.2, 6-2.2)

I. RELAY APPARATUS AND EQUIPMENT (EO 1-1)

A. Relay operation uses pumper at water supply source to move water under pressure through one or more hoselines to next pumper in line

B. Source pumper boosts pressure to supply next pumper, and so on until water reaches fireground

C. Any apparatus equipped with sufficient fire pump placed in middle of relay to assist with pumping chores

D. Following terms used to describe various functions of apparatus in relay pumping operation

  1. Source pumper or supply pumper is pumper connected to water supply at beginning of relay

      operation

  2. Water supply fire hydrant or static water supply source

  3. Source pumper pumps water to next apparatus in line

  4. Relay pumper is pumper or pumpers connected within relay that receives water from source

      pumper or another relay pumper, boosts pressure, and supplies water to next relay pumper or

      attack pumper

  5. Attack pumper is pumper located at fire scene receiving water from relay and supplying attack lines

      and appliances

E. Fire departments use hose tenders to assist in hose lays associated with relay pumping operations

  1. Hose tenders may or may not equipped with fire pump

  2. Hose tenders carry mile or more of LDH

  3. Hose carried in traditional style hose bed or on large, mechanically operated reel

  4. Hose tenders carry wide assortment of relay valves, discharge manifolds, and other special water

      supply equipment used for relay pumping operations

F. Both 3-inch hose and LDH used for relay pumping operations

G. When 3-inch hose used for relay operations, two or three hoselines laid

H. Variety of hose and pump appliances used to assist with relay pumping operations

  1. Intake pressure relief valves or relay reliefs intended to reduce possibility of damage to pump and

     discharge hoselines caused by water hammer when valves closed too quickly or intake pressure

     rises dramatically

  2. Two basic kinds of intake pressure relief valves

      a. One type supplied by pump manufacturer and integral part of pump intake manifold

      b. Second type add-on device screwed onto pump intake connection

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