BS 7775:2005 pdf free.Penstocks for use in water and other liquid flow applications—Specification.
BS 7775 This standard specifies the design and performance criteria for penstocks for use in waste water, watersupply and other liquid flow applications. This standard also sets out the requirements for packaging andinstallation of penstocks.
Annex A sets out information to be supplied by the purchaser for the correct supply of a penstock.
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
Doors shall be one of the following types.
a)Cast iron doors shall be designed and manufactured from material conforming to BS EN 1561:1997 orBS EN 1563:1997.
b) Fabricated metal doors shall be designed so that the stresses and deflections in the door do not exceedthe safe working figures specified in 4.9.4 and 4.9.5. Welding shall be in accordance with BS EN ISO 15614-8,BS EN 1418,BS EN 287-1,BS EN 287-2,BS EN 1011-1,BS EN 1011-2 andJorBS EN 288(all parts), as appropriate. Design and fabrication shall be in accordance with BS 5950-2.c)Composite plastic doors shall be fabricated, formed or moulded and shall be suitably reinforcedinternally or externally as required. If the reinforcement is internal the plastic exterior shall be fullysealed and chemically bonded to the reinforcing matrix and to any cellular polymer or other infillmaterial. The plastic material shall be ultraviolet stabilized in accordance with BS 4618.
The door design shall include a means of connecting the door to the stem.
The door design shall include a means by which it is retained within the frame throughout its travel.
Provision shall be made within the door design for the seal arrangement.
Wedging or pressure devices (see Figure 2 and 3.1.7) shall be provided as a means of forcing the door andframe together to achieve the degree of watertightness specified (see 5.2).
The number of wedges or pressure devices shall be sufficient to withstand the maximum static headspecified and the resultant forces generated by the operating equipment (see 3.1.10).
The design of the seals shall take into account the leakage rate (see Clause 5), environment, operatingfrequency and minimum life.BS 7775 pdf download.