R020932J1, Install Manual

Section I I - General Information

• DO NOT use Clayton equipment for pipe support or pipe anchoring. It is the responsibility of the installation contractor and the customer to provide adequate and proper pipe supports and anchors. Clayton recommends all steam/ fluid heaters, PD feedwater pumps, and water treatment skid pipe supports and anchors use floor-mounted structural steel.

2.10.2 Pipe Sizing Guidelines 2.10.2.1 Suction Piping

Clayton tends to follow the guidelines set forth by the Hydraulic Institute (HI) for positive displace- ment piston pumps. Equivalent pipe lengths for pipe fittings (elbows, tees, etc.) can be found in the HI refer- ence charts.

NOTE While Clayton cannot assume responsibility for the piping system into which our pump is installed, we can provide valuable guidelines for designing a piping system properly.

Suction line sizing is a major factor in the successful operation of any pump. Many pump problems result from a suction line that is too small in diameter, or too long. A properly designed piping system can prevent problems, such as: • Fluid flashing—Entrained fluid gases effuse when pressure in piping or pump falls below fluid vapor pressure. • Cavitation—Free gases in a fluid being forced back into the fluid. These implosions cause severe pressure spikes that pit and damage pump internal parts. • Piping vibration—This can result from improper piping support, cavitation, or normal reciprocat- ing pump hydraulic pulses. • Noisy operation—Most present when pump is cavitating. • Reduced capacity—Can result from fluid flashing. If it is, this is an indication that the pumping chambers are filling up with gases or vapors. These problems can reduce a pump’s life and are a potential hazard to associated equipment and per- sonnel. It is possible to fracture piping and damage the pump components with high pressure surges occur- ring when fluid is flashing or cavitating. Suction piping must be a minimum of one size larger than the pump suction connection. The actual line sizes will depend on meeting flow velocity maximums (see Figure 2-8 and 2-9 on page 2-19 and 2-20, respectively), acceleration head calculations (see paragraph 2.11.3), and NPSH requirements (see Table 2-4 on page 2-26). 2.10.2.2 Discharge Piping Normally, discharge pipe sizing is not an issue for a standard Clayton generator installation. But, when floor space is limited at the installation site, Clayton’s close-coupled reciprocating PD pump will require relocating from its originally-designed location. In these cases, certain precautionary changes must

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